Metformin Enhances Autophagy and Normalizes Mitochondrial Function to Alleviate Aging-Associated Inflammation

Leena P. Bharath, Madhur Agrawal, Grace McCambridge, Dequina A. Nicholas, Hatice Hasturk, Jing Liu, Kai Jiang, Rui Liu, Zhenheng Guo, Jude Deeney, Caroline M. Apovian, Jennifer Snyder-Cappione, Gregory S. Hawk, Rebecca M. Fleeman, Riley M.F. Pihl, Katherine Thompson, Anna C. Belkina, Licong Cui, Elizabeth A. Proctor, Philip A. KernBarbara S. Nikolajczyk

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Age is a non-modifiable risk factor for the inflammation that underlies age-associated diseases; thus, anti-inflammaging drugs hold promise for increasing health span. Cytokine profiling and bioinformatic analyses showed that Th17 cytokine production differentiates CD4+ T cells from lean, normoglycemic older and younger subjects, and mimics a diabetes-associated Th17 profile. T cells from older compared to younger subjects also had defects in autophagy and mitochondrial bioenergetics that associate with redox imbalance. Metformin ameliorated the Th17 inflammaging profile by increasing autophagy and improving mitochondrial bioenergetics. By contrast, autophagy-targeting siRNA disrupted redox balance in T cells from young subjects and activated the Th17 profile by activating the Th17 master regulator, STAT3, which in turn bound IL-17A and F promoters. Mitophagy-targeting siRNA failed to activate the Th17 profile. We conclude that metformin improves autophagy and mitochondrial function largely in parallel to ameliorate a newly defined inflammaging profile that echoes inflammation in diabetes.

Original languageEnglish (US)
Pages (from-to)44-55.e6
JournalCell Metabolism
Volume32
Issue number1
DOIs
StatePublished - Jul 7 2020

All Science Journal Classification (ASJC) codes

  • Physiology
  • Molecular Biology
  • Cell Biology

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