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The effect of islet activating protein on glucose tolerance, insulin secretion and insulin responsiveness was studied in the NZO mouse, a model of non-insulin dependent diabetes and obesity. A single IV injection of 5 ng/g body weight islet activating protein markedly lowered plasma glucose and the glucose response to IP glucose administration, measured 5 days later (mean +/- SEM, plasma glucose levels 0, 10, 30 and 60 min after glucose 6.0 +/- 0.9, 14.6 +/- 1.3, 14.1 +/- 1.3 and 13.2 +/- 1.7 mmol/l in islet activating protein-treated NZO mice versus 12.8 +/- 1.6, 27.8 +/- 3.4, 34.7 +/- 4.1, 39.1 +/- 3.8 mmol/l in carrier-treated NZO mice). There was no difference in fasting plasma insulin levels between islet activating protein and carrier-treated mice. No response of plasma insulin to glucose occurred in the carrier-treated mice, but a highly significant insulin response to glucose was seen in the islet activating protein-treated mice. The in vitro responsiveness of pancreatic islets of islet activating protein-treated NZO mice to glucose was improved, and the inhibitory effect of adrenaline on insulin secretion was reduced. The in vivo hypoglycaemic response to exogenous insulin was not improved by islet activating protein and a demonstrated defect in the insulin sensitivity and responsiveness of glucose utilization by isolated soleus muscle was not reversed by islet activating protein treatment. It is concluded that islet activating protein is highly effective in improving glucose tolerance and insulin secretion in NZO mice, and that the improvement in glucose tolerance occurs without demonstrable improvement in the responsiveness to exogenous insulin or sensitivity of soleus muscle to insulin.

Effect of islet activating protein on glucose tolerance, insulin secretion and insulin responsiveness in the NZO mouse