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This study was conducted to test the hypothesis that acute, widespread N-nitro-L-arginine methyl ester (L-NAME) induced vasoconstriction and hypertension may affect glucose tolerance and insulin sensitivity in normal rats. Comparisons were made of blood pressure, intravenous glucose tolerance, and insulin response and [3H]-deoxyglucose tissue uptake between L-NAME and control treated rats. Chronically instrumented, awake rats were administered L-NAME (30 mg/kg) (n = 8) or saline (0.3 mL) (n = 8) intravenously. After blood pressure stabilized, a bolus injection containing glucose (300 mg/kg) and trace [3H]-deoxyglucose was administered. Arterial blood was sampled for evaluation of glucose tolerance, insulin response, and [3H]-deoxyglucose muscle uptake. L-NAME treated rats had a persistent 54 +/- 4 mm Hg blood pressure rise while fasting, and postload plasma glucose and insulin responses did not differ, nor did heart and striated muscle [3H]-deoxyglucose uptake differ. In conclusion, acute L-NAME induced hypertension does not result in glucose intolerance, hyperinsulinemia, or decreased [3H]-deoxyglucose muscle uptake.

Effect of Acute N-Nitro-?-Arginine Methyl Ester (L-NAME) Hypertension on Glucose Tolerance, Insulin Levels, and [3H]-Deoxyglucose Muscle Uptake