AM237 is a selective TRPC5 channel activator that potently activated homomeric TRPC5:C5 channels (EC50=15–20 nM in Ca2+i assays).AM237 did not activate TRPC4:C4, TRPC4-C1, TRPC5-C1, TRPC1:C5, and TRPC1:C4 channels, or native TRPC1:C4 channels in A498 cells, but potently inhibited EA‐dependent activation of these channels with IC50 values ranging from 0.9 to 7 nM.AM237 (300 nM) did not activate or inhibit TRPC3, TRPC6, TRPV4, or TRPM2 channels.AM237 potentiated TRPC5:C5 channels activation by sphingosine‐1‐phosphate but suppressed activation evoked by (−)‐englerin A (EA).AM237 concentration‐dependently suppressed further activation of Ca2+ influx mediated by EA with IC50 of 13 nM, potentiated TRPC5:C5 activation by S1P.Pico145 is a competitive antagonist of AM237‐mediated TRPC5:C5 activation.
