It is used as a potent and selective inhibitor of CaMKII. KN-62 has demonstrated potent and selective inhibition of Ca2+/calmodulin-dependent protein kinase II (CaMKII; Ki=0.9 ?M) which causes cells to arrest in the S phase. In HEK-293 cells expressing type III adenylyl cyclase (III-AC), 10 ?M of KN-62 blocked CaMKII phosphorylation of III-AC, and inhibited hormone-stimulated Ca2+ oscillations. Additionally, KN-62 is a potent non-competitive antagonist at the P2X7 receptor (IC50 = 15 nM).
Okazaki K et al. KN-62, a specific Ca++/calmodulin-dependent protein kinase inhibitor, reversibly depresses the rate of beating of cultured fetal mouse cardiac myocytes. J Pharmacol Exp Ther. 1994, 270, (3), 1319-24.
Tokumitsu et al. KN-62, 1-[N-O-bis(5-isoquinolinesulfonyl)-N-methyl-L-tyrosyl]-4-phenylpiperazine, a specific inhibitor of Ca2+/calmodulin-dependent protein kinase II. J.Biol.Chem.. 1990, 265, (8), 4315-20.