Activation of the cAMP-PKA pathway antagonizes metformin suppression of hepatic glucose production

Ling He, Evan Chang, Jinghua Peng, Hongying An, Sara M. McMillin, Sally Radovick, Constantine A. Stratakis, Fredric E. Wondisford

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)10562-10570
Number of pages9
JournalJournal of Biological Chemistry
Volume291
Issue number20
DOIs
StatePublished - May 13 2016

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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