Activation of the cAMP-PKA pathway Antagonizes Metformin Suppression of Hepatic Glucose Production

• Published in: The Journal of biological chemistry Vol. 291; no. 20; pp. 10562 - 10570
• Main Authors: He, Ling, Chang, Evan, Peng, Jinghua, An, Hongying, McMillin, Sara M., Radovick, Sally, Stratakis, Constantine A., Wondisford, Fredric E.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 13.05.2016; American Society for Biochemistry and Molecular Biology
• Subjects: Amino Acid Substitution; AMP-activated kinase (AMPK); AMP-Activated Protein Kinases - genetics; AMP-Activated Protein Kinases - metabolism; Animals; aspirin; Cells, Cultured; Cyclic AMP - genetics; Cyclic AMP - metabolism; Cyclic AMP-Dependent Protein Kinases - genetics; Cyclic AMP-Dependent Protein Kinases - metabolism; glucogenesis; Glucose - genetics; Glucose - metabolism; Hepatocytes - metabolism; liver; Liver - metabolism; Metabolism; metformin; Metformin - pharmacology; Mice; Mutation, Missense; protein kinase A (PKA); AMP-activated kinase (AMPK); metformin; aspirin; protein kinase A (PKA); glucogenesis; liver
• ISSN: 0021-9258; 1083-351X
• DOI: 10.1074/jbc.M116.719666

Metformin is the most commonly prescribed oral anti-diabetic agent worldwide. Surprisingly, about 35% of diabetic patients either lack or have a delayed response to metformin treatment, and many patients become less responsive to metformin over time. It remains unknown how metformin resistance or insensitivity occurs. Recently, we found that therapeutic metformin concentrations suppressed glucose production in primary hepatocytes through AMPK; activation of the cAMP-PKA pathway negatively regulates AMPK activity by phosphorylating AMPKα subunit at Ser-485, which in turn reduces AMPK activity. In this study, we find that metformin failed to suppress glucose production in primary hepatocytes with constitutively activated PKA and did not improve hyperglycemia in mice with hyperglucagonemia. Expression of the AMPKα1(S485A) mutant, which is unable to be phosphorylated by PKA, increased both AMPKα activation and the suppression of glucose production in primary hepatocytes treated with metformin. Intriguingly, salicylate/aspirin prevents the phosphorylation of AMPKα at Ser-485, blocks cAMP-PKA negative regulation of AMPK, and improves metformin resistance. We propose that aspirin/salicylate may augment metformin's hepatic action to suppress glucose production.