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To evaluate the roles of hyperglycemia and increased plasma FFA level in the development of insulin resistance, we examined the effects of phlorizin and acipimox treatments on tissue sensitivity to insulin in streptozotocin(STZ)-diabetic rats. Insulin sensitivity was assessed with the glucose-insulin clamp technique. Blood glucose concentration was clamped at basal levels of control and diabetic states, and plasma insulin concentrations were clamped at the levels of basal, approximately 60 and approximately 1500 microU/ml. In diabetic rats, the basal blood glucose and plasma FFA levels in the fasting state were elevated, while the plasma insulin concentration was lower than in normal controls. Moreover, diabetic rats became glucose intolerant after intravenous injection of glucose. The metabolic clearance rate(MCR) of glucose showed a decrease of basal and insulin stimulated response in diabetic rats. As results of the glucose-insulin clamp study and intravenous glucose tolerance test, insulin resistance was developed in STZ-diabetic rats. Phlorizin treatment of diabetic rats recovered insulin sensitivity to nearly normal levels and improved glucose tolerance, but had no effect on insulin action in controls. Insulin sensitivity was also improved by acipimox treatment in diabetic rats, but did not reach normal levels. These results show that hyperglycemia is an obvious causative factor of insulin resistance, and increased FFA level may also act on the development of insulin resistance in STZ-diabetic rats.

Effects of phlorizin and acipimox on insulin resistance in STZ-diabetic rats