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Proliferation and differentiation of pancreatic beta-cells: Ultrastructural analysis of the pancreas in diabetic mice induced by selective alloxan perfusion

, : Proliferation and differentiation of pancreatic beta-cells: Ultrastructural analysis of the pancreas in diabetic mice induced by selective alloxan perfusion. Medical Electron Microscopy 30(3): 170-175

To clarify the mechanism of regenerative processes of pancreatic beta-cells, we constructed a new diabetic model of mice and investigated their pancreatic endocrine cells by electron microscopy. Male ICR mice (8 weeks old) were partially and chemically depancreatized by perfusing alloxan (100 mg/kg body weight) via the caudal vein after clamping the cranial mesenteric artery. By this method, we could render the mice diabetic by partial reduction of beta-cells localized in the splenic, gastric, and parabiliary segment. Glucose intolerance gradually ameliorated without any treatment. In the perfused segments, pancreatic beta-cells showed pyknosis and the mitochondria were swollen 6h after the treatment, while non-beta-cells including alpha-cells remained intact. At 5 days, beta-cells were few and the islets became smaller in size. At 20 weeks, small islet cell clusters (ICCs) were observed budding from interlobular and intralobular ductal epithelial cells. beta-cells scattering in the exocrine pancreas were also frequently observed. In the alloxan-nonperfused segment, beta-cells with thin rough endoplasmic reticulum and immature secretory granules without an electron-opaque halo were observed, and the number of mitochondria increased in some beta-cells at 1 day and 5 days after the treatment. At 20 weeks, beta-cells that contained only mature granules were observed in hypertrophic islets. In this model, both proliferation of residual beta-cells and differentiation of pancreatic endocrine cells from the ductal epithelial cells were recognized.

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