h-1152

H-1152 is a potent, specific, ATP-competitive, and cell permeable ROCK inhibitor (Ki = 1.6 nM).

H-1152 dihydrochloride (H-1152 2HCl) is a specific inhibitor of Rho-associated protein kinase (ROCK) with an IC50 of 12 nM and a Ki of 1.6 nM. H-1152 dihydrochloride inhibits PKA, PKC, PKG, Aurora A and CaMKII with IC50 values of 3.03 μM, 5.68 μM, 0.360 μM, 0.745 μM and 0.180 μM, respectively.

Two Rho-associated kinases (ROCK), ROCK-I and ROCK-II, act downstream of the G protein Rho to regulate cytoskeletal stability. The ROCKs play important roles in diverse cellular functions including cell adhesion and proliferation, smooth muscle contraction, and stem cell renewal. Glycyl-H-1152 is a selective and potent ROCK inhibitor (IC50 = 11.8 nM for ROCK-II). It is a glycylated isoquinoline compound derived from the therapeutically-important ROCK inhibitor HA-1077 (Fasudil) and exhibits better specificity. Thus, it poorly inhibits Ca2+/calmodulin-dependent kinase type II, protein kinase (PK) G, and Aurora A (IC50 = 2.57, 2.35, and 3.26 μM, respectively) as well as PKA or PKC (IC50 ≥ 10 μM for each). The potency of Glycyl-H-1152 is superior to that of other ROCK inhibitors, including Y-27632 (Ki = 220 nM) and HA-1077 (IC50 = 158 nM).