The mRNA was encapsulated in a lipid nanoparticle through a modified ethanol-drop nanoprecipitation process described previously20 (link). Briefly, ionizable, structural, helper, and PEG lipids were mixed with mRNA in acetate buffer, pH 5.0, at a ratio of 2.5:1 (lipids:mRNA). The mixture was neutralized with Tris-Cl, pH 7.5, sucrose was added as a cryoprotectant, and the final solution was sterile filtered. Vials were filled with formulated LNP and stored frozen at −70 °C until further use. The drug product underwent analytical characterization, which included the determination of particle size and polydispersity, encapsulation, mRNA purity, double stranded RNA content, osmolality, pH, endotoxin, and bioburden, and the material was deemed acceptable for in vivo study.
Lipid Nanoparticles
These nanostructures, typically ranging from 50 to 200 nanometers in size, are composed of lipids arranged in a unique bilayer configuration.
Lipid nanoparticles offer numerous advantages, such as improved drug solubility, enhanced bioavailability, and targeted delivery to specific tissues or cells.
Additionally, they can protect sensitive cargo, such as RNA or DNA, from degradation and facilitate their efficient intracellular uptake.
Reseach on lipid nanoparticles continues to evolve, with scientists exploring new formulations, surface modifications, and innovative applications to unlock their full potential.
PubCompare.ai's AI-driven protocol comparison platform can help streamline your lipid nanoparticle optimization effortlessly, allowing you to identify the best protocols from literature, preprints, and patents to advance your research.
Most cited protocols related to «Lipid Nanoparticles»
µEs were obtained with biocompatible GRAS ingredients (Generally Recognized As Safe). Among different lipids tested (TL, trimyristin, tristearin, myristic acid, glyceryl dibehenate, and glyceryl monostearate), a TL solution in EA was chosen as oil phase, because of its highest solubility in this partially water-miscible solvent (
Epikuron® 200 was chosen as surfactant together with polysorbate (20, 40, 80) or Cremophor® RH 60 at 3:1 w/w constant ratio.
Na TdC, Na TC, Na GC, Na C were tested as co-surfactants, BenzOH was chosen as a co-solvent.
A formulation study was performed varying the percentages of surfactant and co-surfactant/co-solvent. The optimal µE formulation, in the absence of any drug, called µE1, is reported in
µE1 (1 mL) was then diluted with a 2% w/w polymeric aqueous solution (5 mL) to precipitate SLNs. In order to avoid SLN aggregation [16 (link)], different polymers (Cremophor® RH60, Pluronic® F68, PVA® 9000, PVA® 14000) and different percentages of Pluronic® F68 were tested to check the best conditions to obtain small and non-aggregated SLNs. Probably, the polymer disposition on SLN surface influences surface hydrophilicity and charge. A formulation study was then performed to optimize SLN size.
Most recents protocols related to «Lipid Nanoparticles»
Example 20
The instant study is designed to test the immunogenicity in rabbits of candidate betacoronavirus (e.g., MERS-CoV, SARS-CoV, HCoV-OC43, HCoV-229E, HCoV-NL63, HCoV-NL, HCoV-NH or HCoV-HKU1 or a combination thereof) vaccines comprising a mRNA polynucleotide encoding the spike (S) protein, the S1 subunit (S1) of the spike protein, or the S2 subunit (S2) of the spike protein obtained from a betacoronavirus (e.g., MERS-CoV, SARS-CoV, HCoV-OC43, HCoV-229E, HCoV-NL63, HCoV-NL, HCoV-NH or HCoV-HKU1).
Rabbits are vaccinated on week 0 and 3 via intravenous (IV), intramuscular (IM), or intradermal (ID) routes. One group remains unvaccinated and one is administered inactivated betacoronavirus. Serum is collected from each rabbit on weeks 1, 3 (pre-dose) and 5. Individual bleeds are tested for anti-S, anti-S1 or anti-S2 activity via a virus neutralization assay from all three time points, and pooled samples from week 5 only are tested by Western blot using inactivated betacoronavirus (e.g., inactivated MERS-CoV, SARS-CoV, HCoV-OC43, HCoV-229E, HCoV-NL63, HCoV-NL, HCoV-NH or HCoV-HKU1).
In experiments where a lipid nanoparticle (LNP) formulation is used, the formulation may include a cationic lipid, non-cationic lipid, PEG lipid and structural lipid in the ratios 50:10:1.5:38.5. The cationic lipid is DLin-KC2-DMA (50 mol %) or DLin-MC3-DMA (50 mol %), the non-cationic lipid is DSPC (10 mol %), the PEG lipid is PEG-DOMG (1.5 mol %) and the structural lipid is cholesterol (38.5 mol %), for example.
Example 8
To evaluate which lipid composition within the dendrimer nanoparticles lead to improved siRNA delivery, the identity and concentration of different phospholipids and PEG-lipids were varied. Three different cell lines (HeLa-Luc, A549-Luc, and MDA-MB231-Luc) were used. The cells were present at 10K cells per well and a 24 hour incubation. The readout was determined 24 hours post transfection. In the nanoparticles, DSPC and DOPE were used as phospholipids and PEG-DSPE, PEG-DMG, and PEG-DHD were used as PEG-lipids. The compositions contain a lipid or dendrimer:cholesterol:phospholipid:PEG-lipid mole ratio of 50:38:10:2. The mole ratio of lipid/dendrimer to siRNA was 100:1 with 100 ng dose being used. The RiboGreen, Cell-titer Fluor, and OneGlo assays were used to determine the effectiveness of these compositions. Results show the relative luciferase activity in HeLa-Luc cells (
Further experiments were run to determine which phospholipids showed the increased delivery of siRNA molecules. A HeLa-Luc cell line was used with 10K cells per well, 24 hour incubation, and readout 24 hours post transfections. The compositions contained either DOPE or DOPC as the phospholipid with PEG-DHD as the PEG-lipid. The ratio of lipid (or dendrimer):cholesterol:phospholipid:PEG-lipid was 50:38:10:2 in a mole ratio with the mole ratio of dendrimer (or lipid) to siRNA of 200:1. These compositions was tested at a 50 ng dose using the Cell-titer Fluor and OneGlo assays. These results are shown in
Example 13
The instant study is designed to test the efficacy in cotton rats of candidate hMPV vaccines against a lethal challenge using an hMPV vaccine comprising mRNA encoding Fusion (F) glycoprotein, major surface glycoprotein G, or a combination of both antigens obtained from hMPV. Cotton rats are challenged with a lethal dose of the hMPV.
Animals are immunized intravenously (IV), intramuscularly (IM), or intradermally (ID) at week 0 and week 3 with candidate hMPV vaccines with and without adjuvant. Candidate vaccines are chemically modified or unmodified. The animals are then challenged with a lethal dose of hMPV on week 7 via IV, IM or ID. Endpoint is day 13 post infection, death or euthanasia. Animals displaying severe illness as determined by >30% weight loss, extreme lethargy or paralysis are euthanized. Body temperature and weight are assessed and recorded daily.
In experiments where a lipid nanoparticle (LNP) formulation is used, the formulation may include a cationic lipid, non-cationic lipid, PEG lipid and structural lipid in the ratios 50:10:1.5:38.5. The cationic lipid is DLin-KC2-DMA (50 mol %) or DLin-MC3-DMA (50 mol %), the non-cationic lipid is DSPC (10 mol %), the PEG lipid is PEG-DOMG (1.5 mol %) and the structural lipid is cholesterol (38.5 mol %), for example.
Example 95
After testing the different strategies for HDR gene editing, the lead CRISPR-Cas9/DNA donor combinations will be re-assessed in primary human hepatocytes for efficiency of deletion, recombination, and off-target specificity. Cas9 mRNA or RNP will be formulated into lipid nanoparticles for delivery, sgRNAs will be formulated into nanoparticles or delivered as AAV, and donor DNA will be formulated into nanoparticles or delivered as AAV.
Example 4
The ability of certain, active HAO1-targeting DsiRNAs to reduce HAO1 levels within the liver of a mouse was examined. DsiRNAs employed in the study were: HAO1-1105, HAO1-1171, HAO1-1221, HAO1-1272, HAO1-1273, HAO1-1316, HAO1-1378 and HAO1-1379, each of which were synthesized with passenger (sense) strand modification pattern “SM107” and guide (antisense) strand modification pattern “M48” (patterns described above). To perform the study, a primary hyperoxaluria model was generated through oral gavage of 0.25 mL of 0.5 M glycolate to cause urine oxalate accumulation in C57BL/6 female mice. Animals were randomized and assigned to groups based on body weight. Intravenous dosing of animals with lipid nanoparticles (LNPs; here, an LNP formulation named EnCore-2345 was employed) containing 1 mg/kg or 0.1 mg/kg of DsiRNA was initiated on day 0. Dosing continued BIW for a total of three doses in mice prior to glycolate challenge. Four hour and 24 h urine samples were collected after glycolate challenge for assessment of oxalate/creatinine levels (see
Robust levels of HAO1 mRNA knockdown were observed in liver tissue of mice treated with 1 mg/kg amounts of HAO1-targeting DsiRNAs HAO1-1171 and HAO1-1378 (
In additional in vivo experiments, both HAO1 and oxalate levels were assessed in both control- and DsiRNA-treated genetically engineered PH1 model mice.
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More about "Lipid Nanoparticles"
These nanostructures, typically ranging from 50 to 200 nanometers in size, are composed of lipids arranged in a unique bilayer configuration.
LNPs offer numerous advantages, such as improved drug solubility, enhanced bioavailability, and targeted delivery to specific tissues or cells.
Lipid nanoparticles can also protect sensitive cargo, such as RNA or DNA, from degradation and facilitate their efficient intracellular uptake.
The research on LNPs continues to evolve, with scientists exploring new formulations, surface modifications, and innovative applications to unlock their full potential.
The Zetasizer Nano ZS is a widely used instrument for analyzing the size and zeta potential of LNPs, providing crucial information for their optimization and characterization.
Cholesterol is a common lipid component in LNP formulations, known for its role in membrane fluidity and stability.
Amicon Ultra centrifugal filters and the NanoAssemblr Ignite platform are often utilized in the production and purification of LNPs.
Opti-MEM, a serum-free cell culture medium, is frequently employed for the transfection of cells with LNP-encapsulated nucleic acids.
The Quant-iT RiboGreen RNA Assay Kit and the V-660 spectrophotometer are valuable tools for quantifying the RNA or DNA encapsulation efficiency within LNPs.
DSPE-PEG2000, a polyethylene glycol-derived lipid, is commonly used for LNP surface modification to enhance their stability and circulation time.
Johansson monochromators are sometimes employed in the characterization of LNP properties, such as their optical absorption and fluorescence.
By leveraging these technologies and insights, researchers can streamline the optimization of lipid nanoparticles and advance their applications in various biomedical and therapeutic domains.