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9 protocols using 5 n ethylcarboxamidoadenosine neca

1

Characterization of N6-modified Adenosine Agonists

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The nineteen test agonists, N6-modified adenosine analogues, were synthesized and initially characterized pharmacologically at the hA3AR overexpressed in CHO cells, as previously reported [15 (link)–17 (link)]. Reference agonists 2-Cl-IB-MECA (2-chloro-N6-(3-iodobenzyl)-5′-N-methylcar-boxamidoadenosine) and NECA (5′-N-ethylcarboxamidoadenosine) were purchased from Tocris Bioscience (Biotechne, Abingdon, UK). Poly-D-lysine hydrobromide and DOTAP Liposomal Transfection Reagent were purchased from Sigma-Aldrich (Steinheim, Germany). FuGene® HD and Nano-Glo Live Cell Reagent were provided by Promega (Madison, WI, USA). Dulbecco’s Modified Eagle’s Medium (DMEM) supplemented with GlutaMAX®, Hank’s Balanced Salt Solution (HBSS), Fetal Bovine Serum (FBS), Phosphate Buffered Saline (PBS), pertussis toxin (PTX), penicillin/streptomycin (10,000 IU/mL and 10,000 μg/mL) and amphotericin B (250 μg/mL) were bought from Thermo Fisher Scientific (Pittsburg, PA, USA). The anti-dNGFR (truncated nerve growth factor receptor) antibody was purchased from Chromaprobe (Maryland Heights, MO, USA). Human Embryonic Kidney (HEK) 293T cells (passage 20) were a kind gift of Prof. O. De Wever of the Laboratory of Experimental Cancer Research (Ghent University Hospital, Belgium). The cell lines CB1-NanoBiT®-βarr2 and CB1-NanoBiT®-miniGαi were described before [14 ,18 (link),19 (link)].
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2

Purine Receptor Signaling Assays

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G418, Lipofectamine and Optimem were obtained from Invitrogen (Paisley, UK). FCS was obtained from PAA Laboratories (Wokingham, UK), L-glutamine from Lonza (Basel, Switzerland) and Fugene HD from Promega (Southampton, UK). Pertussis toxin (PTx) was purchased from Merck Chemicals (Nottingham, UK). NECA [5-(N-ethylcarboxamido)adenosine] and HEMADO [2-(1-hexynyl)-N-methyladenosine] were obtained from Tocris Bioscience (Bristol, UK). The AlphaScreen SureFire p-ERK assay kit was obtained from PerkinElmer (Waltham, MA, USA). [3H]-adenine and [14C]-cAMP were from Perkin-Elmer (Buckinghamshire, UK). CA200645 was purchased from Cellaura Technologies Ltd (Nottingham, UK). All other chemicals and reagents were purchased from Sigma-Aldrich (Gillingham, UK).
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3

Platelet activation signaling pathway

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Horm collagen was obtained from Takeda (High Wycombe, UK). NECA (5'-Nethylcarboxamidoadenosine) was purchased from Tocris Bioscience (Bristol, UK). Cangrelor was purchased from Medicines Company. U46619 was obtained from Cayman Chemical.
Chronolume and ATP were from Chrono-log Corporation (Manchester, UK). Horseradish peroxidase (HRP)-conjugated secondary antibodies and Enhanced Chemiluminescence (ECL) substrate were obtained from Amersham Biosciences (GE Healthcare, Bucks, UK). Oregon green 488 BAPTA-1-AM was purchased from Invitrogen (Invitrogen, ThermoFisher Scientific, Paisley, UK). Other reagents were obtained from Sigma.
Antibodies: PLCγ2 p1217, PLCγ2 p759, Syk p525/526, Syk p323, Syk p352, LAT p132 and LAT p171 were from Cell Signalling Technology (Danvers, Massachusetts, United States).
LAT p200 mAb was obtained from Abcam (Cambridge, UK). Mouse anti-human antiphosphotyrosine (clone 4G10) mAb was from Millipore UK Ltd (Watford, UK). Alexa Fluor 488 phalloidin and Alexa Fluor 647 were purchased from Invitrogen (Invitrogen, ThermoFisher Scientific, Paisley, UK). 1G5-Fab recognises monomeric and dimeric GPVI was raised as described 23 .
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4

Adenosine Receptor Ligands and Analogs

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The adenosine A1 receptor agonist N6-cyclopentyladenosine (N6-CPA, purity > 98%) was obtained from Abcam (Shanghai, China) and dissolved in DMSO at 50 mM. The adenosine A1 receptor antagonist rolofylline (KW-3902, purity > 99%) was obtained from Tocris Bioscience (Bristol, United Kingdom) and dissolved in DMSO at 10 mM. The adenosine A2a receptor agonist CGS 21680 (purity > 98%) was obtained from Abcam and dissolved in DMSO at 10 mM. The adenosine A2a receptor antagonist SCH 58261 (purity > 99%) was obtained from Abcam and dissolved in DMSO at 10 mM. The adenosine A2b receptor agonist BAY 60-6583 (purity > 98%) was obtained from Tocris Bioscience and dissolved in DMSO at 20 mM. The adenosine A2b receptor antagonist PSB603 (purity > 98%) was obtained from Tocris Bioscience and dissolved in DMSO at 10 mM. The adenosine A3 receptor agonist piclidenoson (IB-MECA, purity > 97%) was obtained from Abcam and dissolved in DMSO at 10 mM. The adenosine A3 receptor antagonist MRE 3008F20 (purity > 98%) was obtained from Tocris Bioscience and dissolved in DMSO at 50 mM. The adenosine analog 5′-N-ethylcarboxamidoadenosine (NECA, purity > 99%) was obtained from Tocris Bioscience and dissolved in DMSO at 50 mM. All solutions were stored at –20°C and used within 1 year.
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5

Cellular Model for TGF-β Signaling

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EC cell lines, HEC-1-A (American Type Culture Collection) and HEC-50 (gift from Bryan Hennessy, University of Texas MD Anderson Cancer Center) were maintained as described (21 (link)). Recombinant human TGF-β1 (R&D Systems) was reconstituted in 4 mM hydrochloric acid (HCl) containing 0.1% bovine serum albumin (BSA). 5’AMP and adenosine 5′-(α,β-methylene) diphosphate (AoPCP) were purchased from Sigma-Aldrich and 5’-N-ethylcarboxamidoadenosine (NECA) and N6-cyclopentyladenosine (CPA) from Tocris Bioscience. Non-targeting and CD73 siRNA (1247) were purchased from Sigma-Aldrich (21 (link)). Human CCND1 esiRNA was purchased from Sigma-Aldrich.
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6

Calcium Signaling Pathway Modulation in Cell Culture

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DMEM:F12 was obtained from Corning, and fetal bovine serum, horse serum, antibiotics, TNFα, human EGF and human bFGF was obtained from GIBCO. Nifedipine, methoxyverapamil hydrochloride (D-600), lanthanum chloride, Bapta-AM, caffeine, dantrolene, Stattic, Synta66, EGTA, BSA, cycloheximide and collagenase were obtained from Sigma-Merck; papain was obtained from Worthington Biochemicals. Dexamethasone, 2-APB, 5′-N-Ethylcarboxamidoadenosine (NECA), ATPγS, NNC55-0396, 78c (CD38 inhibitor), xestospongin C, FK506 and ryanodine were purchased from Tocris. Insulin and 8BrcADPr were obtained from Santa Cruz. Fura-2 AM was obtained from Invitrogen. All the lipophilic drugs were dissolved in dimethyl sulfoxide (ethanol in the case of xestospongin C). The final concentration of the solvent was ≤0.1%.
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7

Generation of Murine Dendritic Cell Subsets

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The generation of CD11c+ CD103+ CLEC9A+ DC was described previously.36 (link) Briefly, bone marrow was aseptically isolated from femurs and tibiae of untreated C57BL/6 mice and cultured in complete T cell medium for 16 days with the addition of 200 ng/mL rmFLT3L and 5 ng/mL rmGM-CSF (R&D Systems cat# 427-FL-005 and cat# 415 ML, respectively). Where indicated, after 10 days of initial culture with growth cytokines, AZD4635 at 3 µM, or DMSO as control was added and allowed to incubate for 30 min prior to addition of 5 µM 5′-(N-ethylcarboxamido) adenosine (NECA) (Tocris). The cultures were then continued with growth cytokines for the remaining 6 days prior to cell harvest. Immature dendritic cells (iDC) were induced to a mature phenotype with 1 µg/mL lipopolysaccharide (InvivoGen cat# tlrl-eblps) for 24 hours. Both iDC and mature DC were used for experiments where indicated. Before use in subsequent assays such as T cell co-cultures, DC were washed with Dulbecco’s PBS (DPBS), harvested with Accutase (Sigma cat# A6964) and then washed and resuspended in complete T cell media or flow cytometry staining buffer (ThermoFisher Scientific cat# 00-4222-26).
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8

In Vitro and In Vivo Immune Modulation

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Six- to eight-week-old female wild-type, OT-1 and OT-II mice on a C57BL/6 background were purchased from The Jackson Laboratory (Bar Harbor, ME). All animal procedures were approved by the Institutional Animal Care and Use Committee of Merck & Co., Inc., Kenilworth, NJ, USA.
The pharmacologic HPK1 inhibitor Compound 1 was synthesized according to the methods described in Genentech patent application WO 2018183964 A1. Pembrolizumab and IgG4 isotype were generated by Merck & Co., Inc., Kenilworth, NJ, USA. lipopolysaccharide (LPS) (Sigma-Aldrich, St.Louis, MO), forskolin (FSK) (Sigma-Aldrich, St.Louis, MO), PGE2 (Cayman Chemical, Ann Arbor, MI), ovalbumin (OVA) peptides (OVA257-264 and OVA323-339) (Sigma-Aldrich, St.Louis, MO), and 5’-N-ethylcarboxamido adenosine (NECA) (Tocris, Bristol, UK) were prepared and used according to the manufacturer’s instructions. Anti-human CD3 (hCD3) (Clone OKT3), anti-human CD28 (hCD28) (Clone CD28.2), anti-mouse CD3 (mCD3) (Clone 145-2C11), anti-mouse CD28 (mCD28) (Clone 37.51), and carboxyfluorescein succinimidyl ester (CFSE) cell labeling kit were from Thermo Fisher Scientific (Waltham, MA). Mouse granulocyte macrophage-colony stimulating factor (GM-CSF) and mouse IL-4 were obtained from Peprotech (NJ, USA). All flow antibodies were purchased from Biolegend or BD Bioscience (San Diego, CA).
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9

Adenosine Receptor Agonists and CYP4A Regulation

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5’-(N-ethylcarboxamido) adenosine (NECA) and 2-chloro-N cyclopentyladenosine (CCPA) were purchased from Tocris Biosciences (Minneapolis, MN). Phenylephrine (PE), acetyl choline (ACh), HET0016 and all other chemicals were purchased from Sigma-Aldrich. Antibodies for CYP4A (sc-271983), eNOS (sc-654) and actin (sc-47778) were purchased from Santa Cruz Biotechnology, Santa Cruz, CA. The A1AR antibody was purchased from Sigma-Aldrich.
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