Hyperinsulinemia and hyperglucagonemia following pancreatic islet transplantation in diabetic rats

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Abstract
Fasting blood glucose (FBG), serum immunoreactive insulin (IRI), plasma immunoreactive glucagon (IRG), body weight, and caloric intake were measured in long-term islet-isografted rats eight to 10 months following intraperitoneal islet transplantation in in age-matched, sham-operated, concurrently followed normal and diabetic controls. Islet recipients had normal body weights, but they were significantly polyphagic, hyperinsulinemic, and hyperglucagonemic when compared with normals. Fasting blood glucose levels were reduced by 10 per cent. Several factors may be related to the occurrence of these abnormalities in long-term islet-isografted rats, including (1) the mass of islets transplanted, (2) the age of donor tissue, (3) the heterotopic location of islet grafts, and (4) the lack of normal innervation of transplanted islet cells.

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