Journal
DIABETES
Volume 56, Issue 7, Pages 1792-1801Publisher
AMER DIABETES ASSOC
DOI: 10.2337/db06-1513
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Funding
- NIDDK NIH HHS [K08 DK076562, DK-076562, R01 DK067351-04, DK067351, K08 DK076562-01, R01 DK067351] Funding Source: Medline
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Developing new techniques to induce beta-cells to replicate is a major goal in diabetes research. Endogenous R-cells replicate in response to metabolic changes, such as obesity and pregnancy, which increase insulin requirement. Mouse genetic models promise to reveal the pathways responsible for compensatory beta-cell replication. However, no simple, short-term, physiological replication stimulus exists to test mouse models for compensatory replication. Here, we present a new tool to induce P-cell replication in living mice. Four-day glucose infusion is well tolerated by mice as measured by hemodynamics, body weight, organ weight, food intake, and corticosterone level. Mild sustained hyperglycemia and hyperinsulinemia induce a robust and significant fivefold increase in beta-cell replication. Glucose-induced beta-cell replication is dose and time dependent. R-Cell mass, islet number, R-cell size, and P-cell death are not altered by glucose infusion over this time frame. Glucose infusion increases both the total protein abundance and nuclear localization of cyclin D2 in islets, which has not been previously reported. Thus, we have developed a new model to study the regulation of compensatory P-cell replication, and we describe important novel characteristics of mouse R-cell responses to glucose in the living pancreas.
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