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Fasting metabolite and hormonal levels were studied prospectively in pancreatectomized dogs who had received grafts of their own pancreas. The results were compared with similarly diabetic animals who received exogenous insulin pumped intravenously either peripherally or portally. All animals were studied for 48-91 wk after pancreatectomy. In the autotransplanted animals, the fasting levels of glucose, lactate, pyruvate, alanine, pancreatic glucagon, insulin, gastric inhibitory peptide, and pancreatic polypeptide were all abnormal. In the peripherally infused animals, the fasting levels of glucose, pyruvate, alanine, free fatty acids, and insulin were also abnormal. In the portally infused animals, pyruvate, alanine, gastric inhibitory peptide, gastrin, and pancreatic polypeptide were abnormal. These results suggest that the portal route of insulin delivery may be necessary if fasting metabolite and hormonal levels are to approximate normal most closely whether exogenous intravenous insulin is replaced by implanted pumps or endogenous insulin is replaced by pancreatic transplants.
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