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Nat Med. 2011 Jan;17(1):55-63. doi: 10.1038/nm.2277. Epub 2010 Dec 26.

Receptor-mediated activation of ceramidase activity initiates the pleiotropic actions of adiponectin.

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  • 1Touchstone Diabetes Center, The University of Texas Southwestern Medical Center, Dallas, Texas, USA.

Abstract

The adipocyte-derived secretory factor adiponectin promotes insulin sensitivity, decreases inflammation and promotes cell survival. No unifying mechanism has yet explained how adiponectin can exert such a variety of beneficial systemic effects. Here, we show that adiponectin potently stimulates a ceramidase activity associated with its two receptors, AdipoR1 and AdipoR2, and enhances ceramide catabolism and formation of its antiapoptotic metabolite--sphingosine-1-phosphate (S1P)--independently of AMP-dependent kinase (AMPK). Using models of inducible apoptosis in pancreatic beta cells and cardiomyocytes, we show that transgenic overproduction of adiponectin decreases caspase-8-mediated death, whereas genetic ablation of adiponectin enhances apoptosis in vivo through a sphingolipid-mediated pathway. Ceramidase activity is impaired in cells lacking both adiponectin receptor isoforms, leading to elevated ceramide levels and enhanced susceptibility to palmitate-induced cell death. Combined, our observations suggest a unifying mechanism of action for the beneficial systemic effects exerted by adiponectin, with sphingolipid metabolism as its core upstream signaling component.

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PMID:
21186369
[PubMed - indexed for MEDLINE]
PMCID:
PMC3134999
Free PMC Article

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