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Research Article Free access | 10.1172/JCI113744

Reversibility of defective adipocyte insulin receptor kinase activity in non-insulin-dependent diabetes mellitus. Effect of weight loss.

G R Freidenberg, D Reichart, J M Olefsky, and R R Henry

Department of Pediatrics, University of California, San Diego, La Jolla 92093.

Find articles by Freidenberg, G. in: PubMed | Google Scholar

Department of Pediatrics, University of California, San Diego, La Jolla 92093.

Find articles by Reichart, D. in: PubMed | Google Scholar

Department of Pediatrics, University of California, San Diego, La Jolla 92093.

Find articles by Olefsky, J. in: PubMed | Google Scholar

Department of Pediatrics, University of California, San Diego, La Jolla 92093.

Find articles by Henry, R. in: PubMed | Google Scholar

Published October 1, 1988 - More info

Published in Volume 82, Issue 4 on October 1, 1988
J Clin Invest. 1988;82(4):1398–1406. https://doi.org/10.1172/JCI113744.
© 1988 The American Society for Clinical Investigation
Published October 1, 1988 - Version history
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Abstract

Insulin-stimulated kinase activity of adipocyte-derived insulin receptors is reduced in subjects with non-insulin-dependent diabetes mellitus (NIDDM) but normal in obese nondiabetics. To assess the reversibility of the kinase defect in NIDDM, insulin receptor kinase activity was measured before and after weight loss in 10 NIDDM and 5 obese nondiabetic subjects. Peripheral insulin action was also assessed in vivo by glucose disposal rates (GDR) measured during a hyperinsulinemic (300 mU/M2 per min) euglycemic clamp. In the NIDDMs, insulin receptor kinase activity was reduced by 50-80% and rose to approximately 65-90% (P less than 0.01) of normal after 13.2 +/- 2.0 kg (P less than 0.01) weight loss; comparable weight loss (18.2 +/- 1.5 kg, P less than 0.01) in the nondiabetics resulted in no significant change in insulin receptor kinase activity. Relative to GDR measured in lean nondiabetics, GDR in the NIDDMs was 35% of normal initially and 67% (P less than 0.01) of normal after diet therapy; weight loss in the nondiabetics resulted in an increase in GDR from 53 to 76% of normal (P less than 0.05). These results indicate that the insulin receptor kinase defect that is present in NIDDM is largely reversible after weight reduction. In contrast, the improvement in GDR, in the absence of any change in insulin receptor kinase activity in the nondiabetics, suggests that the main cause of insulin resistance in obesity lies distal to the kinase.

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