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Endocrinology Vol. 140, No. 2 778-783
Copyright © 1999 by The Endocrine Society

ARTICLES

Initiation of Increased Pancreatic Islet Growth in Young Normoglycemic Mice (Umeå +/?)1

Anders Edvell and Per Lindström

Department of Histology and Cell Biology, Umeå University, S-90187 Umeå, Sweden

Address all correspondence and requests for reprints to: Dr. Anders Edvell, Department of Histology and Cell Biology, Umeå University, S-901 87 Umeå, Sweden. E-mail: ansedl97{at}student.umu.se

Pancreatic islets from obese hyperglycemic mice are large and contain a high proportion of normally functioning ß-cells. We have previously shown that young obese mice have an elevated ß-cell proliferation rate at 3 weeks of age. We now wanted to investigate possible factors involved in the initiation of islet growth, including blood glucose, C peptide, glucagon-like peptide-1, vasoactive intestinal polypeptide, and L-5-hydroxytryptophan. We found that the increased ß-cell proliferation on day 20 precedes the rise in blood glucose by 2 days. The islet cell proliferation, measured as the 5-bromo-2'-deoxyuridine labeling index, in 20-day-old lean mice, was enhanced in a dose-dependent manner when glucagon-like peptide-1 or C peptide was injected sc for 2 days. L-5-Hydroxytryptophan inhibited the proliferation. C Peptide also increased the islet cell labeling index during islet culture. We conclude that in addition to the effect of glucose, islet proliferation can be triggered by other factors involved in the physiological regulation of increased insulin release. Stimulation of islet proliferation may be related to the actual release of insulin, and C peptide may function as a mediator of such responses.




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