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Proc Natl Acad Sci U S A. 2009 Apr 7;106(14):5813-8. doi: 10.1073/pnas.0810550106. Epub 2009 Mar 16.

miR-375 maintains normal pancreatic alpha- and beta-cell mass.

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  • 1Institute of Molecular Systems Biology, Swiss Federal Institute of Technology, ETH Zurich, CH-8093 Zurich, Switzerland.

Abstract

Altered growth and development of the endocrine pancreas is a frequent cause of the hyperglycemia associated with diabetes. Here we show that microRNA-375 (miR-375), which is highly expressed in pancreatic islets, is required for normal glucose homeostasis. Mice lacking miR-375 (375KO) are hyperglycemic, exhibit increased total pancreatic alpha-cell numbers, fasting and fed plasma glucagon levels, and increased gluconeogenesis and hepatic glucose output. Furthermore, pancreatic beta-cell mass is decreased in 375KO mice as a result of impaired proliferation. In contrast, pancreatic islets of obese mice (ob/ob), a model of increased beta-cell mass, exhibit increased expression of miR-375. Genetic deletion of miR-375 from these animals (375/ob) profoundly diminished the proliferative capacity of the endocrine pancreas and resulted in a severely diabetic state. Bioinformatic analysis of transcript data from 375KO islets revealed that miR-375 regulates a cluster of genes controlling cellular growth and proliferation. These data provide evidence that miR-375 is essential for normal glucose homeostasis, alpha- and beta-cell turnover, and adaptive beta-cell expansion in response to increasing insulin demand in insulin resistance.

PMID:
19289822
[PubMed - indexed for MEDLINE]
PMCID:
PMC2656556
Free PMC Article
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