EC50: 0.45 μM (TRPC3), 1.13 μM (TRPC7), 4.66 μM(TRPC3).

TRPC6-IN-1 (compound 4o) rises in the TRPC6 cells in a concentration dependent manner, with a mean EC ₅₀ value of 4.66±0.03 μM, demonstrating a comparable activity of the compound on TRPC6 as the original lead. TRPC6-IN-1 is also tested on HEK293 cells that co-expressed μ opioid receptor (MOR) and TRPC4β, which belongs to a different subgroup of TRPC channels than TRPC3/6/7. Upon stimulation by a μ agonist, these cells show a robust increase in [Ca ²⁺ ] _i . TRPC6-IN-1 also evokes whole-cell currents in HEK293 cells that express human TRPC3. TRPC6-IN-1 elicits concentration dependent current increases in the TRPC7 cells. Different from TRPC6, the currents show some desensitization in the high TRPC6-IN-1 concentrations (10 and 30 μM) at both negative and positive potentials even though the low Ca ²⁺ (0.1 mM) bath solution is used. Nonetheless, a stepwise increase in the TRPC7 currents is still detected at <10 μM TRPC6-IN-1.