Sci. Signal., 20 November 2012
Promoting Inflammation and ObesityThe gene encoding GPRC5B, an orphan G protein–coupled receptor found in the brain and adipose tissue, represents an obesity susceptibility locus in humans. Kim et al. found that, compared to their wild-type counterparts, GPRC5B-deficient mice were less obese, had reduced inflammatory signaling in their white adipose tissue, and showed decreased insulin resistance when fed a high-fat diet. In wild-type mouse embryonic fibroblasts, GPRC5B was phosphorylated by and associated with the kinase Fyn, which led to enhanced activation of proinflammatory nuclear factor B signaling involving the kinase IKK. GPRC5B-deficient cells expressing a mutant GPRC5B that could not interact with Fyn did not enhance inflammatory signaling. These findings should encourage investigation of a role for GPRC5B in promoting inflammation and obesity in humans.
Citation: Y.-J. Kim, T. Sano, T. Nabetani, Y. Asano, Y. Hirabayashi, GPRC5B Activates Obesity-Associated Inflammatory Signaling in Adipocytes. Sci. Signal. 5, ra85 (2012).
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