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Pico145 is a remarkable inhibitor of TRPC1/4/5 channels, inhibits (-)-englerin A-activated TRPC4/TRPC5 channels, with IC50s of 0.349 and 1.3 nM in cells, and shows no effect on TRPC3, TRPC6, TRPV1, TRPV4, TRPA1, TRPM2, TRPM8.

Pico145 (Compound 31, C31) is a remarkable small-molecule inhibitor of TRPC1/4/5 channels, inhibits (-)-englerin A-activated TRPC4/TRPC5 channels, with IC50s of 0.349 and 1.3 nM in cells; Pico145 shows no effect on TRPC3, TRPC6, TRPV1, TRPV4, TRPA1, TRPM2, TRPM8. Pico145 also inhibits human TRPC4-TRPC1 and TRPC5-TRPC1 concatemers expressed in HEK 293 Tet+ cells (IC50, 0.03 nM and 0.2 nM, respectively). The potency of Pico145 can be reduced by increased (-)-englerin A concentration. Furthermore, Pico145 potently inhibits RPC4-TRPC1 channels activated by sphingosine 1-phosphate (S1P), and suppresses S1P-evoked Ca2+ entry through TRPC4-TRPC1 channels with an IC50 of 0.011 nM. Pico145 also sensitizes EA-sensitive cancer cell line (Hs578T cells) (IC50, 0.11 nM). Pico145 (100 nM) lacks effect on store-operated Ca2+ entry and histamine-evoked Ca2+ entry into endothelial cells[1].

[1]. Rubaiy HN, et al. Picomolar, selective, and subtype-specific small-molecule inhibition of TRPC1/4/5 channels. J Biol Chem. 2017 May 19;292(20):8158-8173.

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