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Diabetes 52:984-990, 2003
© 2003 by the American Diabetes Association, Inc.
Programming of Islet Functions in the Progeny of Hyperinsulinemic/Obese Rats
From the Department of Biochemistry, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, New York
Neonatal female rat pups that were raised artificially on a high-carbohydrate (HC) milk formula during their suckling period developed hyperinsulinemia immediately, maintained chronic hyperinsulinemia in the postweaning period on laboratory diet, and developed obesity in adulthood. Pups (second-generation HC [2-HC]) born to such female rats (first-generation HC [1-HC]) spontaneously developed chronic hyperinsulinemia and adult-onset obesity (HC phenotype) without the requirement for any dietary intervention in their suckling period. Leftward shift in the insulin secretory response to a glucose stimulus, increase in hexokinase activity, and increased preproinsulin gene transcription were observed in islets from 28-day-old 2-HC rats, and these adaptations are similar to those reported for islets from 12-day-old and 100-day-old 1-HC rats. Unlike 1-HC islets, the ability to secrete moderate amounts of insulin in the absence of glucose and calcium and the incretin input for augmentation of insulin secretion were not observed in 2-HC islets. These results show that a dietary modification in the early postnatal life of the 1-HC female rat sets up a vicious cycle of spontaneous transfer of the HC phenotype to its progeny, implicating a new component to the growing list of factors that contribute to the fetal origins of adult-onset diseases.
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