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- W2907960384 abstract "Insulin secretion and biosynthesis of proinsulin and insulin were determined in isolated pancreatic islets of hypophysectomized rats. Control rats were of both same age and weight. Hypophysectomy was performed either 13 or 5 weeks prior to the investigation, the weight of the animals being either 80 or 170 g. Biosynthesis of insulin was estimated from the amounts of radioactivity incorporated into proinsulin and insulin after incubation of isolated islets at 50 or 300 mg% glucose in the presence of3H-leucine for 3 h. Islet proteins were separated on Sephadex G 50 fine. — Hypophysectomy resulted in a significant decrease of both glucose stimulated secretion and biosynthesis of insulin. It was found that this reduction was 1) more significant when compared with controls of same age 2) more marked in rats which had been hypophysectomized 13 weeks before than in rats after an interval of 5 weeks and 3) less in rats which had been hypophysectomized at a weight of 170 g than in rats in whom pituitary ablation was performed at a weight of 80 g. At basal glucose concentrations, no significant changes of both secretion and biosynthesis of insulin were apparent. The relation of radioactivity incorporated into proinsulin and insulin was unchanged under all conditions. Insulin content of the isolated islets used was found within about the same range in all rats, apart from the animals which had been hypophysectomized 13 weeks before. In islets of these rats, a reduction to 84% was observed. — Our findings may be explained by reduced sensitivity of the pancreatic B-cell to glucose and a slower rate of insulin biosynthesis after hypophysectomy." @default.
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- W2907960384 date "1973-04-01" @default.
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- W2907960384 title "Hypophysis and function of pancreatic islets" @default.
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- W2907960384 doi "https://doi.org/10.1007/bf01230693" @default.
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