Y-27632 is a potent, selective inhibitor of Rho-associated protein kinases (ROCK) with IC50 values of 140-220 nM for ROCK1 and ROCK2. Y-27632 inhibited the kinase activity of both ROCK-I and ROCK-II in vitro, and this inhibition was reversed by ATP in a competitive manner. The ROCK family of Rho-associated serine-threonine protein kinases is known to play an important role in Rho-mediated cell adhesion and smooth muscle contraction. It also inhibits PRK2 with an IC50 value of 600 nM. One-hour treatment with 10 µM Y-27632 blocks apoptosis of dissociated cultured human embryonic stem cells, increasing cloning efficiency by 25% and sustaining survival up to 30 passages. Y-27632 was found to increases human embryonic stem cell (hESC) survival.
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