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Genes Dev. 2003 Jul 1;17(13):1575-80.

cAMP promotes pancreatic beta-cell survival via CREB-mediated induction of IRS2.

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  • 1The Salk Institute for Biological Studies, La Jolla, California 92037, USA.

Abstract

The incretin hormone GLP1 promotes islet-cell survival via the second messenger cAMP. Here we show that mice deficient in the activity of CREB, caused by expression of a dominant-negative A-CREB transgene in pancreatic beta-cells, develop diabetes secondary to beta-cell apoptosis. Remarkably, A-CREB severely disrupted expression of IRS2, an insulin signaling pathway component that is shown here to be a direct target for CREB action in vivo. As induction of IRS2by cAMP enhanced activation of the survival kinase Akt in response to insulin and IGF-1, our results demonstrate a novel mechanism by which opposing pathways cooperate in promoting cell survival.

PMID:
12842910
[PubMed - indexed for MEDLINE]
PMCID:
PMC196130
Free PMC Article

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