The inhibitors were dissolved in distilled water to a final concentration of 40 mM, and the pH of the solution was adjusted to 8.0 with 1 M NaOH. The rhGCPII stock solution (8 mg/mL) was mixed with 1/10 v/v of the individual inhibitor, and the complexes were crystallized using the hanging drop vapor diffusion setup at 293 K. Crystallization droplets were made by combining 1 μL of the rhGCPII–inhibitor mixture and 1 μL of the reservoir solution containing 33% pentaerythriol propoxylate (PO/OH 5/4; Hampton Research), 1% PEG3350, and 100 mM Tris-HCl, pH 8.0. Crystals belonging to the space group I222 typically appeared within two days and reached their final size with approximate dimensions of 0.3 mm × 0.4 mm × 0.1 mm within a week. For data collection crystals were flash-frozen in liquid nitrogen directly from the reservoir solution, and diffraction intensities were collected at 100 K using synchrotron radiation at the SER-CAT sector 22 beamlines of the Advanced Photon Source (Argonne, IL) at the X-ray wavelength of 1.0 Å. In all cases, the diffraction data were collected from a single crystal, recorded on a CCD detector, and processed using the HKL2000 software package.38
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Amino Acid
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Glutamate carboxypeptidase II, human
Glutamate carboxypeptidase II, human
Glutamate carboxypeptidase II is an enzyme that plays a crucial role in the regulation of glutamate and N-acetylaspartylglutamate (NAAG) levels in the human body.
It is responsible for the hydrolysis of NAAG into glutamate and N-acetylaspartate, thereby modulating the availability of these important neurotransmitters and neuromodulators.
This enzyme is expressed in various tissues, including the brain, prostate, and small intestine, and has been implicated in a range of physiological and pathological processes, such as neurological disorders, cancer, and immune function.
Studying the structure, function, and regulation of Glutamate carboxypeptidase II is an active area of research, with potential implications for the development of novel therapeutic strategies.
It is responsible for the hydrolysis of NAAG into glutamate and N-acetylaspartate, thereby modulating the availability of these important neurotransmitters and neuromodulators.
This enzyme is expressed in various tissues, including the brain, prostate, and small intestine, and has been implicated in a range of physiological and pathological processes, such as neurological disorders, cancer, and immune function.
Studying the structure, function, and regulation of Glutamate carboxypeptidase II is an active area of research, with potential implications for the development of novel therapeutic strategies.
Most cited protocols related to «Glutamate carboxypeptidase II, human»
Crystallization
Diffusion
Freezing
inhibitors
Nitrogen
polyethylene glycol 3350
Radiography
Radiotherapy
Tromethamine
Acids
aspartylglutamate
Biological Assay
Buffers
Cardiac Arrest
Cold Temperature
dipeptidase
Exhaling
formate
glutamate carboxypeptidase II, human
Glutamates
Ion Exchange Resins
prisma
Radioactivity
Resins, Plant
Scintillation Counters
sodium phosphate
Tromethamine
Urea
Cytokinesis
DNA Restriction Enzymes
Oligonucleotide Primers
Oligonucleotides
Plasmids
Proteins
Recombinant DNA
secretion
Signal Peptides
tyrosyl-alanyl-glycine
Antibodies, Anti-Idiotypic
brilliant blue G
Caseins
Coomassie brilliant blue R
Densitometry
Dura Mater
Gels
Goat
Immunoglobulins
Mice, House
Nitrocellulose
Polyacrylamide Gel Electrophoresis
polyvinylidene fluoride
Proteins
SDS-PAGE
Silver
Sulfate, Sodium Dodecyl
Tissue, Membrane
Tween 20
acetonitrile
Buffers
Cytokinesis
High-Performance Liquid Chromatographies
Sodium Azide
sodium phosphate
Tetranitrate, Pentaerythritol
Most recents protocols related to «Glutamate carboxypeptidase II, human»
In the human body, folate is absorbed in the mucosal epithelial cells of enterocytes. Folate in foods occurs mainly in the polyglutamate form, which must be hydrolyzed to the monoglutamate form before absorption. This process is carried out by glutamate carboxypeptidase II (GCPII), which exists primarily in the brush border of the proximal part of the jejunum. Mono-glutamate folate is transported across the apical membrane of enterocytes mainly by the proton-coupled folate transporter. Folate in the enterocytes is metabolized to 5-methyl-THF and exported into the portal vein via multidrug resistance-associated protein. It then circulates in the blood and is taken up by the cells via either the reduced folate carrier or receptor-mediated endocytosis of the folate receptors (FRs).[5 ]Intracellular folate is converted into polyglutamate forms, which are catalyzed by folylpoly-gammaglutamate synthetase. This polyglutamylation is essential for the retention of folate within cells and for the utilization of 1-carbon metabolism. Folic acid biological activity relies on the action of the dihydrofolate reductase (DHFR) enzyme produced in the liver. In order to carry out its biological function, folic acid needs to be reduced by DHFR to dihydrofolate and then to tetrahydrofolate. Then, it is converted to its biologically active form. 5-MTHF.[1 (link),6 (link)]The DHFR first converts folate into tetrahydrofolate (THF). Subsequently, with the action of serine hydroxymethyltransferase and 5,10-methylenetetrahydrofolate reductase, THF could be transformed into 5,10-methylenetetrahydrofolate and finally converted to 5-methyl-THF (5-MTHF). The 5-MTHF serves as a transporter to offer an indispensable single-carbon unit for purine and pyrimidine synthesis. Meanwhile, in the methionine synthesis reaction, a methyl group in 5-MTHF is first transferred to VitB12 coenzyme, and then homocysteine is transformed into methionine. The methionine could be further catalyzed by methionine adenosyltransferase (MAT) to produce s-adenosylmethionine, the methyl donor for 5 mC modification (Fig. 1 ).[7 (link)]
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Example 7
As shown in some of the earlier examples, endophytic microbes described herein are capable of conferring significant beneficial traits on the inoculated agricultural plant. In order to explore the pathways augmented or otherwise modified by the endophyte, we performed proteomic analysis on extracts of wheat, maize and soy plants grown on water agar. Sterilized wheat, maize and soy seeds were either mock-inoculated with R2A medium (formulation control), or inoculated with selected endophytes using conditions previously described. The seeds were subjected to the growth parameters as summarized below (Table 15).
Maize and wheat: After 4 days of growth, 12 whole seedlings (including roots, seeds and hypocotyls) per treatment were collected in a 50 mL falcon tube using sterile forceps and immediately snap-frozen in liquid nitrogen to minimize protein degradation and proteomic changes during sample collection (such as wound responses from using the forceps). The frozen samples were then homogenized using a pestle and mortar previously cooled in liquid nitrogen and transferred to a 15 mL falcon tube on dry ice. The homogenized samples were stored at −80° C. until further processing.
Soy: After 5 days of growth, the roots of 27 seedlings per treatment were collected in a 50 mL falcon tube using flamed forceps and immediately snap-frozen in liquid nitrogen to minimize protein degradation and proteomic changes during sample collection (such as wound responses from using the forceps). The frozen samples were then homogenized using a pestle and mortar previously cooled in liquid nitrogen and transferred to a 15 mL falcon tube on dry ice. The homogenized samples were stored at −80° C. until further processing.
Sample Preparation
1 mL of 5% SDS 1 mM DTT was added to 1 mL of homogenized tissue and the samples were boiled for 5 m. The samples were cooled on ice and 2 mL of 8M urea solution was added. The samples were spun for 20 m at 14,000 rpm and the soluble phase recovered. A 25% volume of 100% TCA solution was added to the soluble phase, left on ice for 20 m and centrifuged for 10 m at 14,000 rpm. The protein pellet was washed twice with ice-cold acetone and solubilized in 125 μL 0.2M NaOH and neutralized with 125 μL of 1M Tris-Cl pH 8.0. Protein solutions were diluted in THE (50 mM Tris-Cl pH8.0, 100 mM NaCl, 1 mM EDTA) buffer. RapiGest SF reagent (Waters Corp., Milford, Mass.) was added to the mix to a final concentration of 0.1% and samples were boiled for 5 min. TCEP (Tris (2-carboxyethyl) phosphine) was added to 1 mM (final concentration) and the samples were incubated at 37° C. for 30 min. Subsequently, the samples were carboxymethylated with 0.5 mg ml−1 of iodoacetamide for 30 min at 37° C. followed by neutralization with 2 mM TCEP (final concentration). Proteins samples prepared as above were digested with trypsin (trypsin:protein ratio—1:50) overnight at 37° C. RapiGest was degraded and removed by treating the samples with 250 mM HCl at 37° C. for 1 h followed by centrifugation at 14,000 rpm for 30 min at 4° C. The soluble fraction was then added to a new tube and the peptides were extracted and desalted using Aspire RP30 desalting columns (Thermo Scientific). The trypsinized samples were labeled with isobaric tags (iTRAQ, ABSCIEX, Ross et al 2004), where each sample was labeled with a specific tag to its peptides.
Mass Spectrometry Analysis
Each set of experiments (samples 1-6; 7, 8; 9-12; 13-16; 17-20) was then pooled and fractionated using high pH reverse phase chromatography (HPRP-Xterra C18 reverse phase, 4.6 mm×10 mm 5 μm particle (Waters)). The chromatography conditions were as follows: the column was heated to 37° C. and a linear gradient from 5-35% B (Buffer A-20 mM ammonium formate pH10 aqueous, Buffer B-20 mM ammonium formate pH10 in 80% ACN-water) was applied for 80 min at 0.5 ml min−1 flow rate. A total of 30 fractions of 0.5 ml volume where collected for LC-MS/MS analysis. Each of these fractions was analyzed by high-pressure liquid chromatography (HPLC) coupled with tandem mass spectroscopy (LC-MS/MS) using nano-spray ionization. The nanospray ionization experiments were performed using a TripleTof 5600 hybrid mass spectrometer (AB SCIEX Concord, Ontario, Canada)) interfaced with nano-scale reversed-phase HPLC (Tempo, Applied Biosystems (Life Technologies), CA, USA) using a 10 cm-180 micron ID glass capillary packed with 5 μm C18 Zorbax™ beads (Agilent Technologies, Santa Clara, Calif.). Peptides were eluted from the C18 column into the mass spectrometer using a linear gradient (5-30%) of ACN (Acetonitrile) at a flow rate of 550 μl min−1 for 100 min. The buffers used to create the ACN gradient were: Buffer A (98% H2O, 2% ACN, 0.2% formic acid, and 0.005% TFA) and Buffer B (100% ACN, 0.2% formic acid, and 0.005% TFA). MS/MS data were acquired in a data-dependent manner in which the MS1 data was acquired for 250 ms at m/z of 400 to 1250 Da and the MS/MS data was acquired from m/z of 50 to 2,000 Da. For Independent data acquisition (IDA) parameters MS1-TOF 250 ms, followed by 50 MS2 events of 25 ms each. The IDA criteria, over 200 counts threshold, charge state +2-4 with 4 s exclusion. Finally, the collected data were analyzed using Protein Pilot 4.0 (AB SCIEX) for peptide identifications and quantification.
Results for Plant Inoculation Tests
The proteomics analysis of wheat inoculated with endophytic bacteria (SYM00011, SYM00016B and SYM00057B) grown under heat stress, maize inoculated with SYM00057B grown under normal condition and soy inoculated with (SYM00057B, SYM00596, SYM00052, SYM00002, SYM00046, SYM00218, SYM00508 and SYM00940) revealed three major pathways augmented or otherwise modified by the endophyte: growth promotion, resistance against oxidative stress and mechanisms involved in symbiosis enhancement (Tables 16, 17 and 18). In some embodiments, synthetic endophyte-plant combinations exhibit alteration of multiple plant protein abundance, particularly proteins involved in stress resistance. In some embodiments, alterations comprise upregulation relative to reference agricultural plants of the following polypeptides: gi|351723089/Chalcone-flavonone isomerase 1A and gi|351723125/Glutathione S-transferase GST 24 or gi|351723089/Chalcone-flavonone isomerase 1A and gi|358248196/Polygalacturonase inhibitor 1-like precursor or gi|351723089/Chalcone-flavonone isomerase 1A and gi|359807261/Soyasaponin III rhamnosyltransferase or gi|351723089/Chalcone-flavonone isomerase 1A and gi|571453722/Programmed cell death protein 4 or gi|356536151/Alpha-L-fucosidase 2-like and gi|351723089/Chalcone-flavonone isomerase 1A or gi|356536151/Alpha-L-fucosidase 2-like and gi|351723125/Glutathione S-transferase GST 24 or gi|356536151/Alpha-L-fucosidase 2-like and gi|356559376/26S protease regulatory subunit 7-like or gi|356536151/Alpha-L-fucosidase 2-like and gi|358248196/Polygalacturonase inhibitor 1-like precursor or gi|356536151/Alpha-L-fucosidase 2-like and gi|358249064/Uncharacterized protein LOC100795412 or gi|356536151/Alpha-L-fucosidase 2-like and gi|359807261/Soyasaponin III rhamnosyltransferase or gi|356536151/Alpha-L-fucosidase 2-like and gi|571453722/Programmed cell death protein 4 or gi|356559376/26S protease regulatory subunit 7-like and gi|351723089/Chalcone-flavonone isomerase 1A or gi|356559376/26S protease regulatory subunit 7-like and gi|351723125/Glutathione S-transferase GST 24 or gi|356559376/26S protease regulatory subunit 7-like and gi|358248196/Polygalacturonase inhibitor 1-like precursor or gi|356559376/26S protease regulatory subunit 7-like and gi|359807261/Soyasaponin III rhamnosyltransferase or gi|356559376/26S protease regulatory subunit 7-like and gi|571453722/Programmed cell death protein 4 or gi|358248196/Polygalacturonase inhibitor 1-like precursor and gi|351723125/Glutathione S-transferase GST 24 or gi|358249064/Uncharacterized protein LOC100795412 and gi|351723089/Chalcone-flavonone isomerase 1A or gi|358249064/Uncharacterized protein LOC100795412 and gi|351723125/Glutathione 5-transferase GST 24 or gi|358249064/Uncharacterized protein LOC100795412 and gi|356559376/26S protease regulatory subunit 7-like or gi|358249064/Uncharacterized protein LOC100795412 and gi|358248196/Polygalacturonase inhibitor 1-like precursor or gi|358249064/Uncharacterized protein LOC100795412 and gi|359807261/Soyasaponin III rhamnosyltransferase or gi|358249064/Uncharacterized protein LOC100795412 and gi|571453722/Programmed cell death protein 4 or gi|359807261/Soyasaponin III rhamnosyltransferase and gi|351723125/Glutathione S-transferase GST 24 or gi|359807261/Soyasaponin III rhamnosyltransferase and gi|358248196/Polygalacturonase inhibitor 1-like precursor or gi|571453722/Programmed cell death protein 4 and gi|351723125/Glutathione S-transferase GST 24 or gi|571453722/Programmed cell death protein 4 and gi|358248196/Polygalacturonase inhibitor 1-like precursor or gi|571453722/Programmed cell death protein 4 and gi|359807261/Soyasaponin III rhamnosyltransferase.
In some embodiments, synthetic endophyte-plant combinations exhibit altered abundance of two or more plant proteins that are each involved in distinct beneficial activities in the plant (e.g., plant growth promotion, resistance to stress, or symbiosis). In some embodiments, alterations comprise upregulation relative to reference agricultural plants of the following polypeptides: gi|351723615/Aspartate aminotransferase glyoxysomal isozyme AAT1 precursor and gi|356508869/Lysosomal alpha-mannosidase-like or gi|351723615/Aspartate aminotransferase glyoxysomal isozyme AAT1 precursor and gi|571436840/Pectinesterase/pectinesterase inhibitor 18-like or gi|356536151/Alpha-L-fucosidase 2-like and gi|351723615/Aspartate aminotransferase glyoxysomal isozyme AAT1 precursor or gi|356536151/Alpha-L-fucosidase 2-like and gi|356508869/Lysosomal alpha-mannosidase-like or gi|356536151/Alpha-L-fucosidase 2-like and gi|358248512/Uncharacterized protein LOC100796978 or gi|356536151/Alpha-L-fucosidase 2-like and gi|571436840/Pectinesterase/pectinesterase inhibitor 18-like or gi|358248512/Uncharacterized protein LOC100796978 and gi|356508869/Lysosomal alpha-mannosidase-like or gi|358248512/Uncharacterized protein LOC100796978 and gi|571436840/Pectinesterase/pectinesterase inhibitor 18-like or gi|358249064/Uncharacterized protein LOC100795412 and gi|351723615/Aspartate aminotransferase glyoxysomal isozyme AAT1 precursor or gi|358249064/Uncharacterized protein LOC100795412 and gi|356508869/Lysosomal alpha-mannosidase-like or gi|358249064/Uncharacterized protein LOC100795412 and gi|358248512/Uncharacterized protein LOC100796978 or gi|358249064/Uncharacterized protein LOC100795412 and gi|571436840/Pectinesterase/pectinesterase inhibitor 18-like.
In some embodiments, synthetic endophyte-plant combinations exhibit altered abundance of two or more plant proteins that are each involved in distinct beneficial activities in the plant (e.g., plant growth promotion, resistance to stress, or symbiosis). In some embodiments, alterations comprise upregulation relative to reference agricultural plants of the following polypeptides: gi|351723615/Aspartate aminotransferase glyoxysomal isozyme AAT1 precursor, gi|356505888/RuBisCO-associated protein-like, gi|571470673/Peroxisomal (S)-2-hydroxy-acid oxidase GLO1, gi|356563759/L-arabinokinase-like isoform 1, gi|356558075/Cytosolic triosephosphate isomerase, gi|351724869/Uncharacterized protein LOC100306662, gi|356562473/Xylose isomerase [Glycine max], gi|356563694/ATP synthase protein MI25-like, gi|358248540/Uncharacterized protein LOC100778245, gi|359807469/Molecule involved in rac1 cell signaling, gi|358249004/Uncharacterized protein LOC100792337, gi|571466979/Polyphenol oxidase A1, chloroplastic, gi|356534524/40S ribosomal protein S17-like in combination with down-regulation relative to reference agricultural plants of the following polypeptides: gi|571440773/Villin-3-like isoform X4, gi|356509275/Glutamate synthase [NADH], amyloplastic-like, gi|356506969/Coiled-coil domain-containing protein 124-like, gi|571521870/Nuclear pore anchor-like, gi|571440773/Villin-3-like isoform X4, gi|356509275/Glutamate synthase [NADH], amyloplastic-like, gi|356506969/Coiled-coil domain-containing protein 124-like, gi|571521870/Nuclear pore anchor-like.
In some embodiments, synthetic endophyte-plant combinations exhibit altered abundance of two or more plant proteins that are each involved in distinct beneficial activities in the plant (e.g., plant growth promotion, resistance to stress, or symbiosis). In some embodiments, alterations comprise down regulation relative to reference agricultural plants of the following polypeptides: gi|356506190/Transketolase, chloroplastic and gi|356509275/Glutamate synthase [NADH], amyloplastic-like or gi|356506190/Transketolase, chloroplastic and gi|356516458/Staphylococcal nuclease domain-containing or gi|356506190/Transketolase, chloroplastic and gi|356533407/Embryonic protein DC-8-like or gi|356506190/Transketolase, chloroplastic and gi|356535993/Beta-conglycinin, alpha chain or gi|356506190/Transketolase, chloroplastic and gi|356575855/Beta-conglycinin, beta chain-like or gi|356506190/Transketolase, chloroplastic and gi|571477629/Low-temperature-induced 65 kDa prot. or gi|356509275/Glutamate synthase [NADH], amyloplastic-like and gi|356516458/Staphylococcal nuclease domain-containing or gi|356509275/Glutamate synthase [NADH], amyloplastic-like and gi|356533407/Embryonic protein DC-8-like or gi|356509275/Glutamate synthase [NADH], amyloplastic-like and gi|356535993/Beta-conglycinin, alpha chain or gi|356509275/Glutamate synthase [NADH], amyloplastic-like and gi|356575855/Beta-conglycinin, beta chain-like or gi|356509275/Glutamate synthase [NADH], amyloplastic-like and gi|571477629/Low-temperature-induced 65 kDa prot. or gi|356533407/Embryonic protein DC-8-like and gi|356535993/Beta-conglycinin, alpha chain or gi|356533407/Embryonic protein DC-8-like and gi|356575855/Beta-conglycinin, beta chain-like or gi|356533407/Embryonic protein DC-8-like and gi|571477629/Low-temperature-induced 65 kDa prot. or gi|356575855/Beta-conglycinin, beta chain-like and gi|356535993/Beta-conglycinin, alpha chain or gi|571477629/Low-temperature-induced 65 kDa prot. and gi|356535993/Beta-conglycinin, alpha chain or gi|571477629/Low-temperature-induced 65 kDa prot. and gi|356575855/Beta-conglycinin, beta chain-like.
Proteins involved in the breakdown of seed stored reserves and playing important roles in the stimulation of continued growth during germination were up-regulated by endophytes. This class of proteins includes beta-fructofuranosidases, fructan 1-exohydrolases and carboxypeptidases involved in the mobilization of sucrose, fructans and insoluble proteins respectively, for the release of glucose, fructose and amino acids (Fincher 1989, Annu. Rev. Plant Physiol. Plant Mol. Biol. 40:305-46;). Those results show that bacterial endophytes induce a faster release of nutrients from the seed, leading to augmented growth at early stage of plant development. The levels of proteins playing a role in cell proliferation and elongation were also increased in endophyte-inoculated seedlings. This class of proteins includes dynamins, histones, a ribonucleoside-diphosphate reductase, pectinesterases and villins, involved in cell division, chromatin structure, DNA synthesis, cell wall remodeling and elongation respectively (Hepler et al. 2001, Annu. Rev. Cell Dev. Biol. 17:159-87, Kang et al. 2003, The Plant Cell 15(4): 899-913, and Imoto et al. 2005, Plant Mol. Biol. 58:177-192). Those results demonstrate that, in response to the endophytic bacteria tested, the two types of plant growth, proliferation and elongation, are promoted, leading to substantial growth enhancement.
Resistance Against Stress
A number of proteins involved in resistance against stress were significantly up-regulated in wheat under stress induction and the presence of endophytes. The level of several proteins playing a role in resistance against oxidative stress by scavenging reactive oxygen species was higher in inoculated plants including glutathione S-transferases (GST), peroxidase and ascorbate oxidase (Apel and Hirt 2004, Annu. Rev. Plant Biol. 55:373-99). Those results shows that in addition to plant growth, the endophytes tested promoted the general pathways involved in resistance against oxidative stress. The proteomics data-set also revealed the strong induction of a pectinesterase by SYM00011 and SYM00057B in wheat that might play a role in drought resistance as previously described (Mays et al. WO2013122473).
Symbiosis Enhancement
In maize under normal conditions, only GST was up-regulated, while other abscisic acid (ABA) and stress inducible proteins were down-regulated. The down-regulation of ABA and stress inducible proteins in maize was positively correlated with the down-regulation of proteins associated to programmed cell death, pathogen resistance and hypersensitive response. Moreover, the replication factor C, subunit 3 that negatively regulates plant defense was significantly overexpressed in the SYM00057b inoculated maize seedlings. Those results are consistent with the conventional wisdom that, under normal condition, the establishment of symbioses with beneficial microbes involves decrease in the expression of genes associated to the plant defense system (Samac and Graham, 2007, Plant Physiol. 144(2):582-587).
In addition, several proteins directly associated with beneficial symbioses are up-regulated in the wheat and maize. Several of these proteins are homologous to proteins involved in nodule formation in legumes. Many genes involved in nodulation, such as nodulation receptor kinases are broadly distributed in the plant kingdom, even in plants incapable of forming nodules, as is the case of maize (Endre et al. 2002, Nature 417:962-966). Some of these conserved receptors may sense bacterial signals in symbiotic associations other than Legume-Rhizobia and this may explain why the nodulation factors from Badyrhizobium japonicum are able to enhance seed germination and root growth in maize (Souleimanov et al. 2002, J. Exp. Bot. 53(396):1929-1934).
Results for Soybean Plants
In one embodiment, synthetic combinations of soybean plants and bacterial endophytes (e.g. SYM00057B, SYM00596, SYM00052, SYM00002, SYM00046, SYM00218, SYM00508 and SYM00940) grown under normal conditions produce a proteomic signature including polypeptides associated with growth promotion, resistance against stress and mechanisms involved in symbiosis enhancement (Table 18).
In particular, one or more pathways including the biosynthesis of proline, cell walls, methionine, carbohydrates, proteins, isoprenoid and flavonoids are modulated, e.g., at least one member (e.g., one, two, three, four, five, or six proteins) of a pathway such as arginase, xylose isomerase, sucrose synthase, 60S ribosomal protein L9, isopentenyl-diphosphate delta-isomerase II and flavonoid 3′-monooxygenase are increased relative to a reference soybean plant.
One or more proteins (e.g., one, two, three, four, five, six, seven, eight, nine, or ten proteins) that increase during seed filling, maturation and drying are also modulated, e.g., villin, beta-conglycinin, seed maturation proteins PM24 and PM30, Late embryogenesis abundant protein D-34, seed biotin-containing protein SBP65, embryonic protein DC-8-like, 35 kDa and 51 kDa seed maturation proteins and LEA protein precursor are decreased relative to a reference soybean plant.
One or more proteins (e.g., one, two, three, four, five, six, seven, eight, nine, or ten proteins) with demonstrated effects in plant defense or tolerance against biotic and abiotic stresses are modulated, e.g., 4-coumarate—CoA ligase, thioredoxin, gluthathione S-transferase, glutathione reductase, peroxidase, peroxisomal betaine-aldehyde dehydrogenase, lipoxygenase, heat shock protein 83-like, class I heat shock protein, and mitogen-activated protein kinase are increased relative to a reference soybean plant. In particular, proteins associated with drought tolerance, e.g., plastid-lipid-associated protein, ATP synthase subunit epsilon, chalcone-flavone isomerase, flavonoid 3′monooxygenase, aquaporin PIP2-1-like and prolyl endopeptidase-like are increased relative to a reference soybean plant.
One or more proteins (e.g., one, two, three, four, or five proteins) involved in stress response in the form of apoptosis, plant cell death or cellular degradation, e.g., programmed cell death protein 4, PR10-like protein, squamous cell carcinoma antigen, ubiquitin carboxyl-terminal hydrolase 24-like, and Ethylene-insensitive protein are decreased relative to a reference soybean plant.
One or more proteins (e.g., one, two, three, four, or five proteins) involved in the establishment of symbiosis with beneficial microbes and/or defense against pathogenic microbes, e.g., lectin, isoflavone-reductase-like, pectinesterase inhibitor 18-like, methionine S-methyltransferase and gamma-glutamyl hydrolase are increased relative to a reference soybean plant.
One or more proteins (e.g., one or two proteins) involved in symbiosis with root nodule forming microbes, a category different to the bacterial endophytes used in the experiment, e.g., H/ACA ribonucleoprotein complex and Leghemoglobin reductase-like, are decreased relative to a reference soybean plant.
Three proteins common to most synthetic combinations of soybean plants with endophytes that showed increased levels relative to a reference soybean plant are: alpha-L-fucosidase 2-like, chalcone-flavone isomerase and 26S protease regulatory subunit 7-like.
Three proteins common to most synthetic combinations of soybean plants with endophytes that showed decreased levels relative to a reference soybean plant are: seed biotin-containing protein SBP65, 35 kDa maturation protein and transketolase.
In another embodiment, proteins in the amino acid metabolism pathways such as aspartate aminotransferase glyoxysomal isozyme AAT1 precursor are increased relative to a reference soybean plant whereas glutamate synthase amyloplastic-like isoform X1 is decreased relative to the reference plant.
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Example 5
Additional constructs were generated which include: additional human PD-1-Fc-OX40L constructs as well as human hCD172a-Fc-OX40L, hPD1-Fc-TL1A, hBTLA-Fc-OX40L, hTMIGD2-Fc-OX40L, hTIM3-Fc-OX40L, mPD1-Fc-GITRL, mPD1-Fc-41BBL, mPD1-Fc-TL1A, mCD172a-Fc-CD40L, hTIGIT-Fc-OX40L and canine PD-1-Fc-OX40L. Each of these constructs was codon optimized for expression in Chinese Hamster Ovary (CHO) cells, transfected into CHO cells and individual clones were selected for high expression. High expressing clones were then used for small-scale manufacturing in stirred bioreactors in serum-free media and the relevant chimeric fusion proteins were purified with Protein A binding resin columns.
Binding assays were carried out to characterize the ability of the various human ECD-Fc-OX40L constructs to bind to hOX40. With respect to hXECD-Fc-OX40L, X refers to the ECD of each protein listed in the bracket on the left (with reference to
The binding of SL-279252 to cell surface expressed OX40 on Jurkat cells by flow cytometry was compared to two negative control proteins which are not expected to bind human OX40. These data demonstrate that SL-279252 efficiently binds human OX40 (left panel), while neither human PD1-Fc-TL1A or canine PD1-Fc-OX40L were observed to bind human OX40 (
The human CD172a-Fc-OX40L construct was imported into the protein tertiary prediction software RaptorX to determine the tertiary structure. The predicted tertiary structure is shown in
The codon-optimized DNA sequence of several chimeric fusion proteins were synthesized and directionally cloned into pVITRO2, pcDNA3.4 and other expression vectors. Vectors were then either transiently or stably transfected into CHO or 293 cells and individual clones were selected for high expression. For example, SL-279252 was produced from a transient transfection from 293 cells, purified by affinity chromatography to Protein A columns and evaluated by Coomassie staining, Western blot and quantitated as compared to a BCG standard (
In another example, CD172a-Fc-OX40L was produced from a transient transfection from 293 cells, purified by affinity chromatography to Protein A columns and evaluated by Coomassie staining, Western blot and quantitated as compared to a BCG standard (
The binding affinity of human CD172a-Fc-OX40L was evaluated by surface plasmon resonance (SPR) analysis to hCD47, hOX40 and various human Fc receptors (
To further define the molecular characteristics of CD172a-Fc-OX40L, SPR was performed, analyzing the binding affinities of CD172a-Fc-OX40L to chip-bound, Fcγ receptors FcγR1A and to the neonatal receptor, FcRn. The human immunoglobulin IgG1 was shown to bind with the highest affinities to FcγR1A, followed by FcRn, in addition to low-level binding to FcγR2b (
The codon-optimized DNA sequence of several additional chimeric fusion proteins were synthesized and directionally cloned into pVITRO2, pcDNA3.4 and other expression vectors. Vectors were then either transiently or stably transfected into CHO or 293 cells and individual clones were selected for high expression. For example, canine PD1-Fc-OX40L was produced from a transient transfection from 293 cells, purified by affinity chromatography to Protein A columns and evaluated by Coomassie staining, Western blot and quantitated as compared to a BCG standard (
Each purified protein is characterized by ELISA assays to bind to the marker, e.g. the intended inhibitory ligand as well as the intended costimulatory receptor. For example, to test the binding of purified human PD-1-Fc-OX40L, recombinant PD-L1-Fc is adsorbed to microtiter plates and used to capture PD-1-Fc-OX40L. Any bound PD-1-Fc-OX40L is then detected by using recombinant human OX40-Fc linked to biotin, which is then detected in a chromogenic assay through binding with streptavidin-HRP.
In addition, each purified protein has been characterized by flow cytometry to bind the intended inhibitory ligand as well as the intended costimulatory receptor. For example, human tumor cell lines are characterized for endogenous expression of PD-L1, which was found to be particularly abundant on several human melanoma tumor cell lines. These same tumor cell lines were shown to be negative for human OX40L. Following incubation with PD-1-Fc-OX40L, any bound chimeric fusion protein is detected with human OX40L specific antibodies. Similarly, human Jurkat cells were transfected with human OX40 and shown to be negative for human PD-L1. Following incubation with the chimeric PD-1-Fc-OX40L constructs, any bound complex is detected using anti-human PD-L1 specific antibodies. A series of screening cell lines were generated in order to detect specific cell surface binding of each chimeric fusion protein to its respective receptor/ligand, these included: CHO-K1-CD47, CHO-K1-PD-L1, CHO-K1-HVEM, CHO-K1-HHLA2, CHO-K1-VISTA, CHO-K1-Gal9, HeLa-PD-L1, HeLa-CD47, HeLa-HVEM, HeLa-HHLA2, HeLa-VISTA, HeLa-Gal9.
To determine the functional activity of each receptor, in vitro T cell proliferation assays are performed in the presence of inhibitory ligand positive human tumor cells. For example, human melanoma tumor cells expressing PD-L1 are pulsed with peptides specific for hen egg lysozyme (HEL) and incubated with human HEL specific T cells expressing OX40 receptor. The proliferation of these cells is monitored in the presence and absence of the PD-1-Fc-OX40L construct and found to be functionally responsive to the presence of the chimeric constructs. In a similar system, human tumors expressing HVEM, CD47, galectin-9, TIGIT receptors or TMIGD2 receptors are used.
In some experiments, mouse PD-1-Fc-OX40L or mouse PD-1-Fc-TL1A are used to treat murine tumors known to be positive for murine PD-L1 (including B16-F10 melanoma, MC38 colon carcinoma and CT26 colon carcinoma). In these systems, established tumors are treated with purified chimeric fusion proteins as compared to PD-1-Fc fusion proteins, anti-PD-1 or anti-PD-L1 monoclonal antibodies or anti-OX40 or anti-GITR monoclonal antibodies. In these experiments, the activity of the chimeric constructs is observed to lead to enhanced antigen-specific T cell responses and increased rates of tumor rejection as compared to the individual therapeutics. In some experiments, nucleic acid constructs encoding PD-1-Fc-OX40L or PD-1-Fc-TL1A are directly electroporated into established tumors. In these experiments, the chimeric constructs are shown to lead to increased rates of tumor rejection as well as increased tumor antigen specific CD8+ T cell proliferation detected both in the peripheral blood and within established tumors.
To determine the binding of purified chimeric fusion proteins to human tumor explants, fresh frozen human tumor samples are obtained and incubated with each chimeric fusion protein. Any bound fusion protein is detected with anti-human OX40L and controlled against background staining by separate staining with anti-human OX40L.
To determine the molecular characteristics of each fusion protein, purified chimeric fusion proteins are characterized by size exclusion chromatography. This analysis is important because, for example, the OX40L ECD is known to form a homo-trimer, while the Fc region is known to form a homo-dimer, while the inhibitory ligand binding receptor may either be monomeric (e.g. PD-1) or form homo-multimers (e.g. TIM3). Thus, there are several possibilities for the individual species that may be formed by these chimeric constructs. Further molecular characterization by mass spec, thermal stability, pH stability, physical stability, charge profile, hydrophobicity, physical stability, buffer compatibility and solubility up to 100 mg/mL are also performed.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 32, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 33, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 34, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 35, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 36, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 37, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 38, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 39, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 40, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 41, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 42, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 43, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 44, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 45, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 46, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 47, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 48, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 49, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 50, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 51, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 52, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 53, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 54, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 55, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof. In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 2, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 5, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 7, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 9, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 11, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 13, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 15, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 22, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
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Example 5
Additional constructs were generated which include: additional human PD-1-Fc-OX40L constructs as well as human hCD172a-Fc-OX40L, hPD1-Fc-TL1A, hBTLA-Fc-OX40L, hTMIGD2-Fc-OX40L, hTIM3-Fc-OX40L, mPD1-Fc-GITRL, mPD1-Fc-41BBL, mPD1-Fc-TL1A, mCD172a-Fc-CD40L, hTIGIT-Fc-OX40L and canine PD-1-Fc-OX40L. Each of these constructs was codon optimized for expression in Chinese Hamster Ovary (CHO) cells, transfected into CHO cells and individual clones were selected for high expression. High expressing clones were then used for small-scale manufacturing in stirred bioreactors in serum-free media and the relevant chimeric fusion proteins were purified with Protein A binding resin columns.
Binding assays were carried out to characterize the ability of the various human ECD-Fc-OX40L constructs to bind to hOX40. With respect to hXECO-Fc-OX40L, X refers to the ECD of each protein listed in the bracket on the left (with reference to
The binding of SL-279252 to cell surface expressed OX40 on Jurkat cells by flow cytometry was compared to two negative control proteins which are not expected to bind human OX40. These data demonstrate that SL-279252 efficiently binds human OX40 (left panel), while neither human PD1-Fc-TL1A or canine PD1-Fc-OX40L were observed to bind human OX40 (
The human CD172a-Fc-OX40L construct was imported into the protein tertiary prediction software RaptorX to determine the tertiary structure. The predicted tertiary structure is shown in
The codon-optimized DNA sequence of several chimeric fusion proteins were synthesized and directionally cloned into pVITRO2, pcDNA3.4 and other expression vectors. Vectors were then either transiently or stably transfected into CHO or 293 cells and individual clones were selected for high expression. For example, SL-279252 was produced from a transient transfection from 293 cells, purified by affinity chromatography to Protein A columns and evaluated by Coomassie staining, Western blot and quantitated as compared to a BCG standard (
In another example, CD172a-Fc-OX40L was produced from a transient transfection from 293 cells, purified by affinity chromatography to Protein A columns and evaluated by Coomassie staining, Western blot and quantitated as compared to a BCG standard (
The binding affinity of human CD172a-Fc-OX40L was evaluated by surface plasmon resonance (SPR) analysis to hCD47, hOX40 and various human Fc receptors (
To further define the molecular characteristics of CD172a-Fc-OX40L, SPR was performed, analyzing the binding affinities of CD172a-Fc-OX40L to chip-bound, Fcγ receptors FcγR1A and to the neonatal receptor, FcRn. The human immunoglobulin IgG1 was shown to bind with the highest affinities to FcγR1A, followed by FcRn, in addition to low-level binding to FcγR2b (
The codon-optimized DNA sequence of several additional chimeric fusion proteins were synthesized and directionally cloned into pVITRO2, pcDNA3.4 and other expression vectors. Vectors were then either transiently or stably transfected into CHO or 293 cells and individual clones were selected for high expression. For example, canine PD1-Fc-OX40L was produced from a transient transfection from 293 cells, purified by affinity chromatography to Protein A columns and evaluated by Coomassie staining, Western blot and quantitated as compared to a BCG standard (
Each purified protein is characterized by ELISA assays to bind to the marker, e.g. the intended inhibitory ligand as well as the intended costimulatory receptor. For example, to test the binding of purified human PD-1-Fc-OX40L, recombinant PD-L1-Fc is adsorbed to microtiter plates and used to capture PD-1-Fc-OX40L. Any bound PD-1-Fc-OX40L is then detected by using recombinant human OX40-Fc linked to biotin, which is then detected in a chromogenic assay through binding with streptravidin-HRP.
In addition, each purified protein has been characterized by flow cytometry to bind the intended inhibitory ligand as well as the intended costimulatory receptor. For example, human tumor cell lines are characterized for endogenous expression of PD-L1, which was found to be particularly abundant on several human melanoma tumor cell lines. These same tumor cell lines were shown to be negative for human OX40L. Following incubation with PD-1-Fc-OX40L, any bound chimeric fusion protein is detected with human OX40L specific antibodies. Similarly, human Jurkat cells were transfected with human OX40 and shown to be negative for human PD-L1. Following incubation with the chimeric PD-1-Fc-OX40L constructs, any bound complex is detected using anti-human PD-L1 specific antibodies. A series of screening cell lines were generated in order to detect specific cell surface binding of each chimeric fusion protein to its respective receptor/ligand, these included: CHO-K1-CD47, CHO-K1-PD-L1, CHO-K1-HVEM, CHO-K1-HHLA2, CHO-K1-VISTA, CHO-K1-Gal9, HeLa-PD-L1, HeLa-CD47, HeLa-HVEM, HeLa-HHLA2, HeLa-VISTA, HeLa-Gal9.
To determine the functional activity of each receptor, in vitro T cell proliferation assays are performed in the presence of inhibitory ligand positive human tumor cells. For example, human melanoma tumor cells expressing PD-L1 are pulsed with peptides specific for hen egg lysozyme (HEL) and incubated with human HEL specific T cells expressing OX40 receptor. The proliferation of these cells is monitored in the presence and absence of the PD-1-Fc-OX40L construct and found to be functionally responsive to the presence of the chimeric constructs. In a similar system, human tumors expressing HVEM, CD47, galectin-9, TIGIT receptors or TMIGD2 receptors are used.
In some experiments, mouse PD-1-Fc-OX40L or mouse PD-1-Fc-TL1A are used to treat murine tumors known to be positive for murine PD-L1 (including B16-F10 melanoma, MC38 colon carcinoma and CT26 colon carcinoma). In these systems, established tumors are treated with purified chimeric fusion proteins as compared to PD-1-Fc fusion proteins, anti-PD-1 or anti-PD-L1 monoclonal antibodies or anti-OX40 or anti-GITR monoclonal antibodies. In these experiments, the activity of the chimeric constructs is observed to lead to enhanced antigen-specific T cell responses and increased rates of tumor rejection as compared to the individual therapeutics. In some experiments, nucleic acid constructs encoding PD-1-Fc-OX40L or PD-1-Fc-TL1A are directly electroporated into established tumors. In these experiments, the chimeric constructs are shown to lead to increased rates of tumor rejection as well as increased tumor antigen specific CD8+ T cell proliferation detected both in the peripheral blood and within established tumors.
To determine the binding of purified chimeric fusion proteins to human tumor explants, fresh frozen human tumor samples are obtained and incubated with each chimeric fusion protein. Any bound fusion protein is detected with anti-human OX40L and controlled against background staining by separate staining with anti-human OX40L.
To determine the molecular characteristics of each fusion protein, purified chimeric fusion proteins are characterized by size exclusion chromatography. This analysis is important because, for example, the OX40L ECD is known to form a homo-trimer, while the Fc region is known to form a homo-dimer, while the inhibitory ligand binding receptor may either be monomeric (e.g. PD-1) or form homo-multimers (e.g. TIM3). Thus, there are several possibilities for the individual species that may be formed by these chimeric constructs. Further molecular characterization by mass spec, thermal stability, pH stability, physical stability, charge profile, hydrophobicity, physical stability, buffer compatibility and solubility up to 100 mg/mL are also performed.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 32, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 33, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 34, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 35, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 36, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 37, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 38, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 39, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 40, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 41, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 42, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 43, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 44, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 45, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 46, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 47, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 48, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 49, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 50, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 51, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 52, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 53, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 54, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises: (i) the amino acid sequence of SEQ ID NO: 55, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and (ii) one of the amino acid sequences of SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, SEQ ID NO: 62, SEQ ID NO: 63, SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, and SEQ ID NO: 69, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, and, optionally (iii) an Ig linker selected from the amino acid sequences of SEQ ID NO: 70, SEQ ID NO: 71, and SEQ ID NO: 72, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto, where, also optionally, one or more of (i) and (ii) are connected to (iii) via (iv) a joining linker of SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, or variants thereof.
In various embodiments, the linkers (iii) or (iv) can be substituted for the amino acid sequence of SEQ ID NOs: 23-31, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 2, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 5, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 7, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 9, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 11, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 13, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 15, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
In some embodiments, the present chimeric protein comprises the amino acid sequence of SEQ ID NO: 22, or at least 90%, or 93%, or 95%, or 97%, or 98%, or 99% identity thereto.
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Example 1
Temporal modulation of canonical Wnt signaling has been shown to be sufficient to generate functional cardiomyocytes at high yield and purity from numerous hPSC lines (Lian, X. et al. (2012) Proc. Natl. Acad. Sci. USA 109:E1848-1857; Lian, X. et al. (2013) Nat. Protoc. 8:162-175). In this approach, Wnt/β-catenin signaling first is activated in the hPSCs, followed by an incubation period, followed by inhibition of Wnt/β-catenin signaling. In the originally published protocol, Wnt/β-catenin signaling activation was achieved by incubation with the Gsk3 inhibitor CHIR99021 (GSK-3 α, IC50=10 nM; GSK-3, β IC50=6.7 nM) and Wnt/β-catenin signaling inhibition was achieved by incubation with the Porcn inhibitor IWP2 (IC50=27 nM). Because we used Gsk3 inhibitor and Wnt production inhibitor for cardiac differentiation, this protocol was termed GiWi protocol. To improve the efficiency of the original protocol and reduce the potential side effects of the small molecules used in the original protocol, a second generation protocol was developed that uses another set of small molecules with higher inhibition potency. In this second generation GiWi protocol, Wnt/β-catenin signaling activation was achieved by incubation with the Gsk3 inhibitor CHIR98014 (CAS 556813-39-9; commercially available from, e.g., Selleckchem) (GSK-3 α, IC50=0.65 nM; GSK-3, β IC50=0.58 nM) and Wnt/β-catenin signaling inhibition was achieved by incubation with the Porcn inhibitor Wnt-059 (CAS 1243243-89-1; commercially available from, e.g., Selleckchem or Tocris) (IC50=74 pM). The Gsk3 inhibitor CHIR98014 was used to promote cardiac mesodermal differentiation, whereas the Porcn inhibitor Wnt-059 was used to enhance ventricular progenitor differentiation from mesoderm cells.
For cardiomyocyte differentiation via the use of these small molecules, hPSCs were maintained on Matrigel (BD Biosciences) coated plates (Corning) in E8 medium (described in Chen, G. et al. (2011) Nature Methods, 8:424-429; commercially available; STEMCELL Technologies) or mTeSR1 medium (commercially available; STEMCELL Technologies). Suitable hPSCs include induced pluripotent stem cells (iPSCs) such as 19-11-1, 19-9-7 or 6-9-9 cells (Yu, J. et al. (2009) Science, 324:797-801) and human embryonic stem cells (hESCs), such as ES03 (WiCell Research Institute) and H9 cells (Thomson, J. A. et al. (1998) Science, 282:1145-1147).
hPSCs maintained on a Matrigel-coated surface in mTeSR1 medium were dissociated into single cells with Accutase (Life Technologies) at 37° C. for 5 minutes and then seeded onto a Matrigel-coated cell culture dish at 100,000-200,000 cells/cm2 in mTeSR1 medium supplemented with 5 μM ROCK inhibitor Y-27632 (Selleckchem)(day −2) for 24 hours. Cells were then cultured in mTeSR1, changed daily. At day 0, cells were then treated with 1 μM Gsk3 inhibitor CHIR98014 (Selleckchem) for 24 hours (day 0 to day 1) in RPMI/B27-ins (500 ml RPMI with 10 ml B27 supplement without insulin). The medium was then changed to the corresponding medium containing 2 μM the Porcn inhibitor Wnt-059 (Selleckchem) at day 3, which was then removed during the medium change on day 5. Cells were maintained in RPMI/B27 (stock solution: 500 ml RMPI medium+10 ml B27 supplement) starting from day 7, with the medium changed every three days. This exemplary culturing protocol for generating cardiomyogenic progenitor cells is illustrated schematically in the drawing.
Flow cytometry and immunostaining were preformed to examine the expression of particular lineage markers. After 24 hour treatment with CHIR-98014, more than 99% of the hPSCs expressed the mesoderm marker Brachyury. Three days after treatment with CHIR-98014, more than 95% of differentiated cells expressed Mesp1, which marks the cardiac mesoderm. The culture protocol not only allowed the cells to synchronously differentiate into the cardiac mesodermal lineage, but also reproducibly generated more than 90% of ventricular myocytes after 14 days of differentiation, as determined by cTnT flow cytometry and electrophysiology analysis.
To further assess cardiac differentiation of the hPSCs over time, Western blot analysis was performed on days 0-7 and d11 to examine the expression of Isl1 and Nkx2.5 (cardiomyogenic progenitor markers) and cTnI (a cardiac myocyte marker). Cells were lysed in M-PER Mammalian Protein Extraction Reagent (Pierce) in the presence of Halt Protease and Phosphatase Inhibitor Cocktail (Pierce). Proteins were separated by 10% Tris-Glycine SDS/PAGE (Invitrogen) under denaturing conditions and transferred to a nitrocellulose membrane. After blocking with 5% dried milk in TBST, the membrane was incubated with primary antibody overnight at 4° C. The membrane was then washed, incubated with an anti-mouse/rabbit peroxidase-conjugated secondary antibody at room temperature for 1 hour, and developed by SuperSignal chemiluminescence (Pierce). During cardiac differentiation of hPSCs, Isl1 expression started on day 4 and increased to its maximum expression on day 6, whereas NK×2.5 only started to express on day 6 and reached its maximum expression after day 10. Cardiomyoctes (cTnI+ cells) were not induced until day 11 of differentiation.
In addition, immunostaining of the day 6 cells was performed for Isl1 expression. Cells were fixed with 4% formaldehyde for 15 minutes at room temperature and then stained with primary (anti-Isl1) and secondary antibodies in PBS plus 0.4% Triton X-100 and 5% non-fat dry milk (Bio-Rad). Nuclei were stained with Gold Anti-fade Reagent with DAPI (Invitrogen). An epifluorescence microscope (Leica DM IRB) with a QImaging® Retiga 4000R camera was used for imaging analysis. The results showed substantial numbers of Isl1+ cells.
Flow cytometry analysis of day 6 cells for Isl1 expression also was performed. Cells were dissociated into single cells with Accutase for 10 minutes and then fixed with 1% paraformaldehyde for 20 minutes at room temperature and stained with primary and secondary antibodies in PBS 0.1% Triton X-100 and 0.5% BSA. Data were collected on a FACSCaliber flow cytometer (Beckton Dickinson) and analyzed using FloJo. The results showed that more than 95% of cells expressed Isl1 at this stage.
In summary, this example provides a protocol for human ventricular progenitor generation (HVPG protocol) that allows for the large-scale production of billions of Isl1+ human HPVs efficiently within 6 days.
Example 2
To profile the transcriptional changes that occur during the cardiac differentiation process at a genome-scale level, RNA sequencing (RNA-seq) was performed at different time points following differentiation to build cardiac development transcriptional landscapes. We performed RNA-seq experiments on day 0 to day 7 samples, as well as day 19 and day 35 samples (two independent biological replicates per time point). Two batches of RNA-seq (100 bp and 50 bp read length) were performed using the illumine Hiseq 2000 platform. In total, 20 samples were examined. Bowtie and Tophat were used to map our reads into a reference human genome (hg19) and we calculate each gene expression (annotation of the genes according to Refseq) using RPKM method (Reads per kilobase transcript per million reads). Differentiation of hPSCs to cardiomyocytes involves five major cell types: pluripotent stem cells (day 0), mesoderm progenitors (day 1 to day 2), cardiac mesoderm cells (day 3 to day 4), heart field progenitors (day 5, day 6 and day 7), and cardiomyocytes (day 10 after).
Molecular mRNA analysis of cardiac differentiation from hPSCs using the HVPG protocol revealed dynamic changes in gene expression, with down-regulation of the pluripotency markers OCT4, NANOG and SOX2 during differentiation. Induction of the primitive streak-like genes T and MIXL1 occurred within the first 24 hours following CHIR-98014 addition, and was followed by upregulation of the cardiac mesodermal marker MESP1 on day 2 and day 3. Expression of the cardiac muscle markers TNNT2, TNNC1, MYL2, MYL7, MYH6, MYH7 and IRX4 was detected at later stage of differentiation (after day 10).
By this analysis, genes enriched at each differentiation stage, including mesoderm cells, cardiac progenitors and cardiomyocytes, were identified. Mesoderm cells, which are related to day 1 differentiated cells, express brachyury. We identified potential surface markers for mesoderm cells, including: FZD10, CD48, CD1D, CD8B, IL15RA, TNFRSF1B, TNFSF13, ICOSLG, SEMA7A, SLC3A2, SDC1, HLA-A. Through similar analysis, we also identified surface markers for cardiac mesoderm mesp1 positive cells, including: CXCR4, ANPEP, ITGA5, TNFRSF9, FZD2, CD1D, CD177, ACVRL1, ICAM1, L1CAM, NGFR, ABCG2, FZD7, TNFRSF13C, TNFRSF1B.
Consistent with western blot analysis, ISL1 mRNA was expressed as early as day 4 and peaked on day 5, one day before its protein expression reached its peak. On day 5 of differentiation (the cardiac progenitor stage, isl1 mRNA expression maximum on day 5, isl1 protein expression maximum on day 6), the day 5 enriched genes were compared with an anti-CD antibody array (a panel of 350 known CD antibodies) and a number of potential cell-surface protein markers were identified. We identified many cell-surface proteins expressed at this stage, including: FZD4, JAG1, PDGFRA, LIFR (CD118), TNFSF9, FGFR3.
The cell surface protein Jagged 1 (JAG1), Frizzled 4 (FZD4), LIFR (CD118) and FGFR3 were selected for further analysis. Jagged 1 expression was further studied as described below and in Example 3. Frizzled 4 expression was further studied as described in Example 4. LIFR (CD118) and FGFR3 expression was further studied as described in Example 5.
Firstly, the expression of Isl1 and Jag1 was profiled using the double staining flow cytometry technique. Flow cytometric analysis was carried out essentially as described in Example 1, using anti-Isl1 and anti-Jag1 antibodies for double staining. Jagged 1 expression was found to trace the expression of Islet 1 and on day 6 of differentiation, all of the Islet 1 positive cells also expressed Jagged 1, and vice versa. Because of the co-expression pattern of these two markers, a Jagged 1 antibody was used to enrich the 94.1% Islet 1+ cells differentiated population to 99.8% purity of Islet1+Jagged1+ cells.
It also was confirmed that Islet 1 is an earlier developmental gene than the Nkx2.5 gene using double immunostaining of ISL1 and NKX2.5 expression in HVPs. The purified HVPs uniformly express the ISL1 gene, but at this stage, only a few of the cells started to express Nkx2.5.
Furthermore, immunostaining with both anti-Isl1 and anti-Jag 1 was performed, essentially as described in Example 1, on week 4 human fetal heart tissue, neonatal heart tissue and 8-year old heart tissue. The results revealed that in the in vivo fetal heart, all of the Islet 1 positive cells also expressed Jagged 1. However, the neonatal heart and 8-year old heart did not express Islet 1 or Jagged 1. In the ventricle of week 4 human fetal heart, cardiac Troponin T (cTnT) staining revealed visible sarcomere structures. In addition, over 50% of ventricular cells in the week 4 fetal heart expressed both Islet1 and Jagged1, which was markedly decreased during subsequent maturation, with the loss of expression of both Islet1 and Jagged1 in the ventricular muscle cells of the human neonatal hearts.
The above-described experiments demonstrate that Jagged 1 is a cell surface marker for Islet 1 positive cardiomyogenic progenitor cells.
Example 3
To characterize the clonal differentiation potential of Isl1+Jag1+ cells, cardiomyogenic progenitor cells were generated by the culturing protocol described in Example 1, and one single Isl1+Jag1+ cell was seeded into one well of a Matrigel-coated 48-well plate. Cells were purified with antibody of Jag1 and then one single cell was seeded into one well. The single cells were then cultured for 3 weeks in Cardiac Progenitor Culture (CPC) medium (advanced DMEM/F12 supplemented with 2.5 mM GlutaMAX, 100 μg/ml Vitamin C, 20% Knockout Serum Replacement).
Immunostaining of the 3-week differentiation cell population was then performed with three antibodies: cardiac troponin I (cTn1) for cardiomyocytes, CD144 (VE-cadherin) for endothelial cells and smooth muscle actin (SMA) for smooth muscle cells. The results showed that the single cell-cultured, Isl1+Jag1+ cells gave rise to cTnI positive and SMA positive cells, but not VE-cadherin positive endothelial cells, indicating these generated Islet1+ cells are heart muscle progenitors that have limited differentiation potential to endothelial lineages. Purified Islet1+Jagged1+ cells differentiated with the HVPG protocol from human induced pluripotent stem cells (iPSC 19-9-11 line) also showed similar in vitro differentiation potential and predominantly differentiate to cTnI+SMA+ cells, but not VE-cadherin+ cells. Over the course of several weeks, the cells expressed the ventricular specific marker MLC2v, indicating that the initial ISL1+ subset was already committed to the ventricular cell fate. Because of the limited vascular differentiation potential of Islet1+ cells generated using the HVPG protocol, these generated Islet1+ cells might represent a distinct progenitor population from the previously reported KDR+ population (Yang, L. et al. (2008) Nature 453:524-528) or multipotent ISL1+ cells (Bu, L. et al. (2009) Nature 460:113-117; Moretti, A. et al. (2006) Cell 127:1151-1165), which can give rise to all three lineages of cardiovascular cells.
These results demonstrated that the Isl1+Jag1+ cardiomyogenic progenitor cells can be successfully cultured in vitro from a single cell to a significantly expanded cell population (1×109 cells or greater) that contains all three types of cardiac lineage cells, with a predominance of cardiomyocytes. Furthermore, these cells can be cultured in vitro for extended periods of time, for at least 2-3 weeks, and even for months (e.g., six months or more). Since the cardiomyogenic progenitor cells gradually differentiate into cardiomyocytes, which do not proliferate, a culture period of approximately 2-3 weeks is preferred.
Example 4
As described in Example 2, Frizzled 4 (FZD4) was identified by RNA-seq analysis as being expressed in cardiac progenitor cells. Thus, to confirm FZD4 as a cell surface marker of cardiac progenitor cells, FZD4 expression was assessed during cardiac differentiation via Western blot analysis. The results demonstrated that FZD4 was not expressed in pluripotent stem cells and the first 3 days differentiated cells. However, FZD4 started to express on day 4 and maximize its expression on day 5 of expression.
In order to quantify the co-expression pattern of FZD4 and Isl1 at the single cell level, FACS analysis was performed. On day 5 of differentiation, more than 83% of cells express both isl1 and FZD4, demonstrating that FZD4 is a cell surface marker for Isl1 positive cells during cardiac progenitor differentiation using the GiWi protocol.
In order to confirm that both JAG1 and FZD4 were indeed co-expressed with ISL1 on the human ventricular progenitor cells, triple immunofluorescence analysis of day 6 differentiated cells from hPSCs was performed with antibodies to Islet 1, Jagged 1 and Frizzled 4. The triple staining experiment demonstrated that Isl1+ cells expressed both Jagged 1 and Frizzled 4.
Example 5
As described in Example 2, LIFR(CD118) and FGFR3 were identified by RNA-seq analysis as being expressed in cardiac progenitor cells. In this example, expression of these additional cell surface markers for the human ventricular progenitor cells was confirmed by flow cytometry analysis. Human ventricular progenitor (HVP) cells were generated as described in Example 1 or 11 and day 6 cells were analyzed by standard flow cytometry. A double staining flow cytometry experiment using anti-Islet 1 and anti-Leukemia Inhibitory Factor Receptor (LIFR) antibodies was performed. The results demonstrate that the HVP cells co-express Islet 1 and LIFR, thereby confirming that LIFR is a cell surface marker for the HVP cells. Furthermore, flow cytometry experiments were performed comparing the expression of LIFR and Fibroblast Growth Factor Receptor 3 (FGFR3) on day 6 HVP cells to undifferentiated embryonic stem (ES) cells. The results demonstrate that LIFR and FGFR3 are both highly enriched for expression on the HVP cells, thereby confirming that LIFR and FGFR3 are both cell surface markers for the HVP cells.
Example 6
The ES03 human embryonic stem cell (hESC) line (obtained from WiCell Research Institute) expresses green fluorescent protein (GFP) driven by the cardiac-specific cTnT promoter. ES03 cells were used to generate Isl1+Jag1+ cardiomyogenic progenitor cells using the culturing protocol described in Example 1. The Isl1+Jag1+ cardiomyogenic progenitor cells were transplanted into the hearts of severe combined immunodeficient (SCID) beige mice to document their developmental potential in vivo.
Briefly, Isl1+Jag1+ cells were injected (1,000,000 cells per recipient) directly into the left ventricular wall of NOD/SCID-gamma mice in an open-chest procedure. Hearts were harvested 2-3 weeks post surgery, fixed in 1% PFA and sectioned at 10 μm (n=12). Histological analyses of the hearts of the transplanted mice revealed the presence of GFP+ donor cells, detected by epifluorescence and by staining with an anti-GFP antibody, demonstrating that the Isl1+Jag1+ cardiomyogenic progenitor cells were capable of differentiating into cardiomyocytes when transplanted in vivo.
The Isl1+Jag1+ cardiomyogenic progenitor cells were also transplanted directly into infarcted hearts of SCID beige mice (“injured mice”), as compared to similarly transplanted normal mice. When analyzed two weeks later, injured mice transplanted with the Isl1+Jag1+ cardiomyogenic progenitor cells had a larger graft size than the normal mice similarly transplanted, demonstrating the cardiomyocyte regeneration capacity of the Isl1+Jag1+ cardiomyogenic progenitor cells in vivo.
Example 12
In this example, genes in the angiogenic family that are expressed in human ventricular progenitor cells (HVPs) were identified. HVPs were generated as described in Examples 1 or 11 and RNA sequencing (RNA-seq) was performed at different time points following differentiation as described in Example 2. Cluster analysis of gene expression profiles at different time points during HVP differentiation identified stage-specific signature genes. These genes were clustered hierarchically on the basis of the similarity of their expression profiles. First, genes showing expression in four different categories were identified: (i) cell surface expression; (ii) co-expression with Islet 1; (iii) high expression on day 5 of differentiation; and (iv) high d5/d0 ratio. This analysis confirmed the cell surface markers for HVPs of: JAG1, FZD4, FGFR3, LIFR (CD118) and TNFSF9. Next, from this same population of HVPs that identified the cell surface markers, gene ontogeny searches were performed to identify angiogenic family genes that were expressed in this population of HVPs, to thereby identify a gene fingerprint profile that identifies genes critical for cell engraftment.
Statistically, Pearson's correlation with Isl1 expression was used to identify those angiogenic genes whose expression in the HVPs best correlated with Isl1 expression. Table 1 below lists the angiogenic genes that correlate with Isl1 expression with a Pearson's correlation of 0.50 or higher.
Angiogenic genes whose expression negatively correlated with Isl1 expression in the HVPs were also identified. Table 3 below lists the angiogenic genes that negatively correlate with Isl1 expression with a Pearson's correlation of −0.50 or less.
Example 13
In this example, genes in the extracellular matrix family that are expressed in human ventricular progenitor cells (HVPs) were identified. HVPs were generated as described in Examples 1 or 11 and RNA sequencing (RNA-seq) was performed at different time points following differentiation as described in Example 2. Cluster analysis of gene expression profiles at different time points during HVP differentiation identified stage-specific signature genes. These genes were clustered hierarchically on the basis of the similarity of their expression profiles. First, genes showing expression in four different categories were identified: (i) cell surface expression; (ii) co-expression with Islet 1; (iii) high expression on day 5 of differentiation; and (iv) high d5/d0 ratio. This analysis confirmed the cell surface markers for HVPs of: JAG1, FZD4, FGFR3, LIFR (CD118) and TNFSF9. Next, from this same population of HVPs that identified the cell surface markers, gene ontogeny searches were performed to identify extracellular matrix family genes that were expressed in this population of HVPs, to thereby identify a gene fingerprint profile that identifies genes critical for cell engraftment.
Statistically, Pearson's correlation with Isl1 expression was used to identify those extracellular matrix genes whose expression in the HVPs best correlated with Isl1 expression. Table 5 below lists the extracellular matrix genes that correlate with Isl1 expression with a Pearson's correlation of 0.50 or higher.
Extracellular matrix genes whose expression negatively correlated with Isl1 expression in the HVPs were also identified. Table 7 below lists the extracellular matrix genes that negatively correlate with Isl1 expression with a Pearson's correlation of −0.50 or less.
Example 14
In this example, the gene expression profile was determined for Islet 1 negative cells within the Day 6 HVP population to further characterize a subpopulation of cells within the Day 6 population that do not express the necessary markers to qualify as engraftable HVPs. Day 6 HVP populations were generated as described in Examples 1 or 11 and RNA sequencing (RNA-seq) was performed following differentiation as described in Example 2. Cells that were Islet 1 negative (Isl1−) were further analyzed with respect to their gene expression profile. Genes expressed in the Isl1− cells with an average RNA copy number of 2000 or higher are shown below in Table 9.
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More about "Glutamate carboxypeptidase II, human"
Glutamate carboxypeptidase II, also known as GCPII, NAALADase, or FOLH1, is a crucial enzyme involved in the regulation of glutamate and N-acetylaspartylglutamate (NAAG) levels in the human body.
This enzyme plays a vital role in the hydrolysis of NAAG, breaking it down into glutamate and N-acetylaspartate, thereby modulating the availability of these important neurotransmitters and neuromodulators.
GCPII is expressed in various tissues, including the brain, prostate, and small intestine, and has been implicated in a range of physiological and pathological processes, such as neurological disorders, cancer, and immune function.
Studying the structure, function, and regulation of GCPII is an active area of research, with potential implications for the development of novel therapeutic strategies.
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This enzyme plays a vital role in the hydrolysis of NAAG, breaking it down into glutamate and N-acetylaspartate, thereby modulating the availability of these important neurotransmitters and neuromodulators.
GCPII is expressed in various tissues, including the brain, prostate, and small intestine, and has been implicated in a range of physiological and pathological processes, such as neurological disorders, cancer, and immune function.
Studying the structure, function, and regulation of GCPII is an active area of research, with potential implications for the development of novel therapeutic strategies.
To enhance your GCPII research, consider utilizing tools like PubCompare.ai, an AI-driven platform that can help you optimize your protocols and discover the most effective methods to advance your studies.
This platform allows you to compare protocols and products from literature, pre-prints, and patents, ensuring you have access to the latest and most effective techniques.
In your GCPII research, you may also encounter other relevant tools and materials, such as Octaethylene glycol monododecyl ether (a detergent used in biochemical applications), Streptavidin Mutein Matrix (for affinity purification), Rotiszint eco plus scintillation cocktail (for liquid scintillation counting), Hygromycin B (an antibiotic used for selection), Acetonitrile (a common solvent), CuSO4 (a chemical reagent), Agilent 2100 Bioanalyzer (for biomolecular analysis), Goat anti-mouse antibody conjugated with horseradish peroxidase (for immunodetection), Sodium azide (a preservative), and 5-mm steel beads (for sample disruption).
By understanding the capabilities and applications of these tools, you can optimize your GCPII research and achieve your desired outcomes more efficiently.