Bisindolylmaleimide XI (hydrochloride)

Bisindolylmaleimide XI (BIM XI) is a selective, cell-permeable protein kinase C (PKC) inhibitor that displays 10-fold greater selectivity for PKCα (IC50 = 9 nM) and 4-fold greater selectivity for PKCβI (IC50 = 28 nM) over Ca2+-independent PKCε (IC50 = 108 nM). Inhibition of PKCα by BIM XI and other similar PKC inhibitors has been associated with enhanced cardiac contractility and protection from heart failure. BIM XI prevents T-cell activation and proliferation (with IC50s ranging from 30-150 nM) associated with chronic inflammatory responses in vivo.