Percentages of activation or inhibition in Ca2+ microfluorometry assays of TRPV1, TRPV3, TRPA1, TRPM3, and ASIC3 channels selected β-lactams (10 µM)

CompoundConfighTRPV1 agonism (%)hTRPV1 antagonism (%)hTRPV3 antagonism (%)hTRPA1 agonism (%)hTRPA1 antagonism (%)hTRPM3 antagonism (%)ASIC3 antagonism (%)
1a3S,4S,2'S31.3 ± 3.619.4 ± 1.7–6.3 ± 5.90.4 ± 0.34.2 ± 1.1ND6.0 ± 0.9
1b3S,4S,2'R4.7 ± 3.6–9.4 ± 15.1–6.6 ± 2.90.4 ± 0.2–2.4 ± 7.58.9 ± 8.8–10.1 ± 8.9
1c3R,4R,2'S63.7 ± 3.152.6 ± 17.0a6.6 ± 2.50.7 ± 0.1–13.1 ± 8.87.5 ± 10.3ND
1d3R,4R,2'R–2.2 ± 3.2–1.5 ± 0.811.2 ± 3.00.2 ± 0.6–6.1 ± 4.98.5 ± 1.8ND
9d3R,4R,2'R4.9 ± 0.6–8.8 ± 2.90.1 ± 0.91.3 ± 0.27.8 ± 0.610.6 ± 2.9ND
11a3S,4S,2'S26.7 ± 3.146.4 ± 0.4a7.1 ± 0.41.1 ± 0.49.5 ± 3.419.9 ± 6.62.1 ± 6.2

hTRPV1: human transient receptor potential vanilloid, type 1; hTRPA1: human transient receptor potential ankirin, type 1; hTRPM3: human transient receptor potential melastatin, subtype 3; ASIC3: acid sensing ion cannel, subunit 3; IC50: concentration exerting a half-maximal inhibition; ND: no data. In all cases, data is from two experiments in duplicate. Agonism: assay for agonist activity. Antagonism: assay for antagonist activity (see Materials and methods). Agonists used for activation of the different channels: TRPV1 (capsaicin, 30 nM), TRPV3 [2-aminoethoxydiphenyl borate (2-APB), 30 µM], TRPA1 (allylisothiocyanate, 10 µM), TRPM3 (pregnenolone sulfate, 50 µM), ASIC3 (buffer, pH 5.5). Antagonists used as references: TRPV1 (capsazepin, IC50 1.3 × 10−7 M), TRPV3 (ruthenium red, IC50 2.5 × 10−7 M), TRPA1 (ruthenium red, 10 µM), TRPM3 (isosakuranetin, 10 µM; IC50 50 nM), ASIC3 (amiloride, 1 mM). ª The observed antagonism could be due, at least in part, to desensitization, since the compound is able to activate the receptor > 20%