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Cell Metab. 2008 Feb;7(2):113-24. doi: 10.1016/j.cmet.2007.12.010.

Oxidative stress contributes to aging by enhancing pancreatic angiogenesis and insulin signaling.

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1
Institut Curie, 26 Rue d'Ulm, 75248 Paris Cedex 05, France.

Abstract

JunD, a transcription factor of the AP-1 family, protects cells against oxidative stress. Here, we show that junD(-/-) mice exhibit features of premature aging and shortened life span. They also display persistent hypoglycemia due to enhanced insulin secretion. Consequently, the insulin/IGF-1 signaling pathways are constitutively stimulated, leading to inactivation of FoxO1, a positive regulator of longevity. Hyperinsulinemia most likely results from enhanced pancreatic islet vascularization owing to chronic oxidative stress. Indeed, accumulation of free radicals in beta cells enhances VEGF-A transcription, which in turn increases pancreatic angiogenesis and insulin secretion. Accordingly, long-term treatment with an antioxidant rescues the phenotype of junD(-/-) mice. Indeed, dietary antioxidant supplementation was protective against pancreatic angiogenesis, hyperinsulinemia, and subsequent activation of insulin signaling cascades in peripheral tissues. Taken together, these data establish a pivotal role for oxidative stress in systemic regulation of insulin and define a key role for the JunD protein in longevity.

PMID:
18249171
DOI:
10.1016/j.cmet.2007.12.010
[Indexed for MEDLINE]
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