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Diabetes. 2009 Apr;58(4):840-6. doi: 10.2337/db08-1428. Epub 2009 Jan 16.

Mice with hyperghrelinemia are hyperphagic and glucose intolerant and have reduced leptin sensitivity.

Author information

1
Department of Investigative Medicine, Hammersmith Campus, Imperial College London, London, UK.

Abstract

OBJECTIVE:

Ghrelin is the only known peripheral hormone to increase ingestive behavior. However, its role in the physiological regulation of energy homeostasis is unclear because deletion of ghrelin or its receptor does not alter food intake or body weight in mice fed a normal chow diet. We hypothesized that overexpression of ghrelin in its physiological tissues would increase food intake and body weight.

RESEARCH DESIGN AND METHODS:

We used bacterial artificial chromosome transgenesis to generate a mouse model with increased ghrelin expression and production in the stomach and brain. We investigated the effect of ghrelin overexpression on food intake and body weight. We also measured energy expenditure and determined glucose tolerance, glucose stimulated insulin release, and peripheral insulin sensitivity.

RESULTS:

Ghrelin transgenic (Tg) mice exhibited increased circulating bioactive ghrelin, which was associated with hyperphagia, increased energy expenditure, glucose intolerance, decreased glucose stimulated insulin secretion, and reduced leptin sensitivity.

CONCLUSIONS:

This is the first report of a Tg approach suggesting that ghrelin regulates appetite under normal feeding conditions and provides evidence that ghrelin plays a fundamental role in regulating beta-cell function.

PMID:
19151202
PMCID:
PMC2661599
DOI:
10.2337/db08-1428
[Indexed for MEDLINE]
Free PMC Article

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