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- W2051290654 abstract "Insulin responses to glucose and non-glucose secretagogues were studied in short-term cultured pancreatic islets and perfused pancreata of the glucose intolerant F1 hybrid rats of spontaneously diabetic Goto-Kakizaki and control Wistar rats. After culture at 5.5 mmol/l glucose, hybrid islet responses to 11.1, 16.7 and 27.0 mmol/l glucose were between 60 and 40% of control islet responses. A combination of 1 mmol/l isobutylmethylxanthine and 16.7 mmol/l glucose induced a pronounced insulin release, which was of similar magnitude in hybrid and control rat islets. This response was not further augmented by addition of glibenclamide and arginine. The slope of potentiation of arginine (10 mmol/l)-stimulated insulin secretion by glucose (5.5-16.7 mmol/l) was greatly impaired in hybrid islets. In contrast to glucose, alpha-ketoisocaproate (KIC), which is metabolized in Krebs cycle, dose-dependently stimulated insulin secretion to similar levels in hybrid and control islets, cultured at 5.5 mmol/l glucose. Also in hybrid islets depolarized by potassium chloride (30 mmol/l) and with adenosine triphosphate-sensitive K+-channels kept open by diazoxide, insulin responses to glucose were greatly impaired but intact to KIC. Furthermore, KIC potentiated normally the insulin response to arginine in hybrid islets. In the isolated perfused pancreas, KIC induced similar insulin responses in hybrid rats and control rats. The potentiating effect by 5.5 mmol/l glucose on the KIC-stimulated insulin responses was, however, greatly reduced in isolated islets and absent in the perfused pancreata of hybrid rats. Taken together, these findings suggest an intact capacity for insulin release, although the initiating and potentiating effect by glucose on insulin release are defective in the Goto-Kakizaki-hybrid rats. An abnormal beta-cell glucose metabolism proximal to the Krebs cycle is likely to account for the impairment of insulin release." @default.
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- W2051290654 date "1998-10-20" @default.
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- W2051290654 title "Preserved initiatory and potentiatory effect of α-ketoisocaproate on insulin release in islets of glucose intolerant rats" @default.
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- W2051290654 doi "https://doi.org/10.1007/s001250051078" @default.
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