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Effect of d-fenfluramine on basal glucose turnover and fat-feeding-induced insulin resistance in rats


There is evidence that fenfluramine improves insulin action independently of its anorectic and weight-loss-inducing properties. Chronic d-fenfluramine also reduces hypothalamic noradrenergic tone, which correlates highly with hepatic glucose output. We report that chronic d-fenfluramine (5 ameliorates insulin resistance induced by high-fat feeding. Insulin action was assessed in adult male rats at basal insulin levels and at hyperinsulinemia (approximately 140 mU/L with the euglycemic clamp technique). Hepatic glucose production, peripheral glucose disposal, and individual tissue glucose metabolism were determined from bolus injections of [3H]-2-deoxyglucose and [14C]glucose. Food intake was matched between groups. Basal glucose turnover was reduced 28% (P less than .05) in fat-fed rats receiving d-fenfluramine (fat + fen). The glucose infusion rate to maintain euglycemia was 22.0 +/- 1.1 in the high-carbohydrate-fed rats, 8.2 +/- 1.0 in fat-fed rats, and 15.1 +/- 0.5 in the fat + fen group. Peripheral glucose disposal, reflecting measured skeletal muscle changes, was reduced by fat feeding (from 23.5 +/- 1.0 to 13.8 +/- 0.6 but was improved by d-fenfluramine (16.9 +/- 0.5, P less than .05 vs. fat fed). Impaired suppression of hepatic glucose output by insulin, caused by fat feeding, was totally reversed by d-fenfluramine. Thus, d-fenfluramine counteracted diet-induced insulin resistance, with the predominant effect on the liver. We hypothesize that d-fenfluramine improves insulin action by reducing hypothalamic noradrenergic tone, which in turn reduces the neural drive to hepatic glucose output and improves the hepatic response to insulin.

Type Journal
ISBN 0012-1797 (Print)
Authors Storlien, L. H.;Thorburn, A. W.;Smythe, G. A.;Jenkins, A. B.;Chisholm, D. J.;Kraegen, E. W. :
Garvan Authors Prof Ted Kraegen
Publisher Name DIABETES
Published Date 1989-01-01 00:00:00
Published Volume 38
Published Issue 4
Published Pages 499-503
Status Published In-print