8-CPT-2Me-cAMP sodium is a sodium salt compound that selectively activates exchange proteins activated by cAMP (Epac). These Epac proteins are cAMP-sensitive guanine nucleotide exchange factors (GEFs) responsible for activating small GTPases Rap1 and Rap2. 8-CPT-2Me-cAMP sodium specifically activates Epac1 with an EC50 value of 2.2 μM, while showing no activation of PKA with an EC50 value greater than 10 μM [1]. Additionally, 8-CPT-2Me-cAMP sodium stimulates the Epac-mediated release of calcium ions (Ca2+) in vitro in pancreatic β-cells [2].
SB-747651A is a potent, ATP-competitive inhibitor of mitogen- and stress-activated kinase 1 (MSK1, IC50 = 11 nM). It targets the N-terminal kinase domain. SB-747651A inhibits MSK1, MSK2, PKA, PKB, RSK and p70S6K activity in cells.