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Proc Natl Acad Sci U S A. 2014 Feb 18;111(7):2686-91. doi: 10.1073/pnas.1400419111. Epub 2014 Feb 3.

Blocking CD40-TRAF6 signaling is a therapeutic target in obesity-associated insulin resistance.

Author information

1
Department of Clinical Pathobiochemistry, Technische Universität Dresden, 01307 Dresden, Germany.

Erratum in

  • Proc Natl Acad Sci U S A. 2014 Mar 25;111(12):4644. Schulte, Klaus [corrected to Schulte, Klaus-Martin].

Abstract

The immune system plays an instrumental role in obesity and insulin resistance. Here, we unravel the role of the costimulatory molecule CD40 and its signaling intermediates, TNF receptor-associated factors (TRAFs), in diet-induced obesity (DIO). Although not exhibiting increased weight gain, male CD40(-/-) mice in DIO displayed worsened insulin resistance, compared with wild-type mice. This worsening was associated with excessive inflammation of adipose tissue (AT), characterized by increased accumulation of CD8(+) T cells and M1 macrophages, and enhanced hepatosteatosis. Mice with deficient CD40-TRAF2/3/5 signaling in MHCII(+) cells exhibited a similar phenotype in DIO as CD40(-/-) mice. In contrast, mice with deficient CD40-TRAF6 signaling in MHCII(+) cells displayed no insulin resistance and showed a reduction in both AT inflammation and hepatosteatosis in DIO. To prove the therapeutic potential of inhibition of CD40-TRAF6 in obesity, DIO mice were treated with a small-molecule inhibitor that we designed to specifically block CD40-TRAF6 interactions; this compound improved insulin sensitivity, reduced AT inflammation, and decreased hepatosteatosis. Our study reveals that the CD40-TRAF2/3/5 signaling pathway in MHCII(+) cells protects against AT inflammation and metabolic complications associated with obesity whereas CD40-TRAF6 interactions in MHCII(+) cells aggravate these complications. Inhibition of CD40-TRAF6 signaling by our compound may provide a therapeutic option in obesity-associated insulin resistance.

KEYWORDS:

immunity; metabolism; type 2 diabetes

PMID:
24492375
PMCID:
PMC3932883
DOI:
10.1073/pnas.1400419111
[Indexed for MEDLINE]
Free PMC Article

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