212481-66-8

ABT-546 (A-216546) is a potent, highly selective and active endothelin ETA receptor antagonist with a Ki of 0.46 nM for [125I]endothelin-1 binding to cloned human endothelin ETA. ABT-546 is >25,000-fold more selective for the ETA receptor than for the ETB receptor. ABT-546 blocks endothelin-1-induced arachidonic acid release and phosphatidylinositol hydrolysis with IC50 of 0.59 nM and 3 nM, respectively[1].

ET_A: 0.46 nM (Ki)

[1] u-Wong JR, et al. Pharmacology of A-216546: a highly selective antagonist for endothelin ET(A) receptor. Eur J Pharmacol. 1999 Feb 5;366(2-3):189-201. DOI:10.1016/s0014-2999(98)00891-7