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The effects of chemical diabetes and fasting on fuel metabolism and insulin secretory activity in late pregnancy were investigated. Female Wistar rats were made chemically diabetic (CD) by intravenous injection of streptozotocine (30 mg/kg) 2 weeks before conception. When CD pregnant rats were fed, plasma glucose and insulin levels were not significantly different from those of normal pregnant rats. Ketone body levels, however, were higher in CD pregnant rats than in normal pregnant rats, indicating insulin resistance in CD rats. Insulin secretion from the perfused pancreas caused by arginine or glucose was markedly decreased in CD pregnant rats. The pregnant rats were fasted for 2 days, from day 19 to 21 of gestation. Plasma glucose and insulin concentrations decreased similarly in the two groups, whereas ketone body concentrations in CD pregnant rats were significantly higher than those in normal pregnant rats. Glucose-induced insulin secretion by the perfused pancreas was markedly attenuated by fasting and was not significantly different in normal and CD pregnant rats. These observations suggest that diabetes mellitus accelerates starvation in late gestation, due to increased insulin resistance and poor insulin secretion, and that fasting in diabetic pregnancy amplifies ketogenesis.

Insulin Release from the Pancreas and Fuel Metabolism during Late Gestation in Chemically Diabetic Rats.