AMPK Modulates Tissue and Organismal Aging in a Non-Cell-Autonomous Manner

• Neuronal AMPK induces autophagy in brain and gut and slows systemic aging
• Neuronal Atg1 induces autophagy in brain and gut and slows systemic aging
• Intestinal AMPK induces autophagy in gut and brain and slows systemic aging
• Intertissue effects of AMPK/Atg1 linked to altered insulin-like signaling

SummaryAMPK exerts prolongevity effects in diverse species; however, the tissue-specific mechanisms involved are poorly understood. Here, we show that upregulation of AMPK in the adult Drosophila nervous system induces autophagy both in the brain and also in the intestinal epithelium. Induction of autophagy is linked to improved intestinal homeostasis during aging and extended lifespan. Neuronal upregulation of the autophagy-specific protein kinase Atg1 is both necessary and sufficient to induce these intertissue effects during aging and to prolong the lifespan. Furthermore, upregulation of AMPK in the adult intestine induces autophagy both cell autonomously and non-cell-autonomously in the brain, slows systemic aging, and prolongs the lifespan. We show that the organism-wide response to tissue-specific AMPK/Atg1 activation is linked to reduced insulin-like peptide levels in the brain and a systemic increase in 4E-BP expression. Together, these results reveal that localized activation of AMPK and/or Atg1 in key tissues can slow aging in a non-cell-autonomous manner.

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