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Diabetes. 2004 Feb;53 Suppl 1:S136-42.

Uncoupling protein 2 and islet function.

Author information

1
Department of Biomedical Sciences, University of Prince Edward Island, Charlottetown, Prince Edward, Canada. cchan@upei.ca

Abstract

Stressors such as chronic hyperglycemia or hyperlipidemia may lead to insufficient insulin secretion in susceptible individuals, contributing to type 2 diabetes. The molecules mediating this effect are just beginning to be identified. Uncoupling protein (UCP)-2 may be one such negative modulator of insulin secretion. Accumulating evidence shows that beta-cell UCP2 expression is upregulated by glucolipotoxic conditions and that increased activity of UCP2 decreases insulin secretion. Mitochondrial superoxide has been identified as a posttranslational regulator of UCP2 activity in islets; thus, UCP2 may provide protection to beta-cells at one level while simultaneously having detrimental effects on insulin secretion. Interestingly, the latter appears to be the dominant outcome, because UCP2 knockout mice display an increased beta-cell mass and retained insulin secretion capacity in the face of glucolipotoxicity.

PMID:
14749279
DOI:
10.2337/diabetes.53.2007.s136
[Indexed for MEDLINE]
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