Metabolic orchestration of cell death by AMPK-mediated phosphorylation of RIPK1

Science. 2023 Jun 30;380(6652):1372-1380. doi: 10.1126/science.abn1725. Epub 2023 Jun 29.

Abstract

Adenosine monophosphate-activated protein kinase (AMPK) activity is stimulated to promote metabolic adaptation upon energy stress. However, sustained metabolic stress may cause cell death. The mechanisms by which AMPK dictates cell death are not fully understood. We report that metabolic stress promoted receptor-interacting protein kinase 1 (RIPK1) activation mediated by TRAIL receptors, whereas AMPK inhibited RIPK1 by phosphorylation at Ser415 to suppress energy stress-induced cell death. Inhibiting pS415-RIPK1 by Ampk deficiency or RIPK1 S415A mutation promoted RIPK1 activation. Furthermore, genetic inactivation of RIPK1 protected against ischemic injury in myeloid Ampkα1-deficient mice. Our studies reveal that AMPK phosphorylation of RIPK1 represents a crucial metabolic checkpoint, which dictates cell fate response to metabolic stress, and highlight a previously unappreciated role for the AMPK-RIPK1 axis in integrating metabolism, cell death, and inflammation.

MeSH terms

  • AMP-Activated Protein Kinases* / genetics
  • AMP-Activated Protein Kinases* / metabolism
  • Animals
  • Energy Metabolism*
  • Inflammation / metabolism
  • Ischemia / metabolism
  • Mice
  • Necroptosis*
  • Phosphorylation
  • Receptor-Interacting Protein Serine-Threonine Kinases* / genetics
  • Receptor-Interacting Protein Serine-Threonine Kinases* / metabolism
  • Stress, Physiological*

Substances

  • AMP-Activated Protein Kinases
  • Ripk1 protein, mouse
  • Receptor-Interacting Protein Serine-Threonine Kinases
  • AMPK alpha1 subunit, mouse