A-769662

A-769662 is a potent, reversible AMP-activated protein kinase (AMPK) activator with an EC50 of 0.8 μM.A-769662 displays selectivity towards β1 subunit-containing heterotrimers. A-769662 not only inhibits fatty acid synthesis with an IC50 of 3.2 μM but also decreases plasma glucose and triglyceride levels in vivo. The addition of A-769662 to mouse embryonic fibroblasts or primary mouse hepatocytes stimulates phosphorylation of acetyl-CoA carboxylase (ACC), effects that are completely abolished in AMPK-alpha1 (-/-)alpha2 (-/-) cells but not in TAK1 (-/-) mouse embryonic fibroblasts. Phosphorylation of AMPK and ACC in response to A-769662 is also abolished in isolated mouse skeletal muscle lacking LKB1, a major upstream kinase for AMPK in this tissue. A-769662 directly prevents the alpha (1)-isoform of the Na (+)-K (+)-ATPase which is purified from rat and human kidney cells in vitro with IC50 of 57 μM and 220 μM, respectively. Suppression of the Na (+)-K (+)-ATPase by 100 μM ouabain decreases sodium pump activity and cell surface abundance, similar to the effect of A769662 (A 769662; A-769662), without influencing the phosphorylation of AMPK and ACC.