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Diabetes, Vol 46, Issue 3 524-527, Copyright © 1997 by American Diabetes Association

ARTICLES

Insulin receptor substrate-1 phosphorylation and phosphatidylinositol 3-kinase activity in skeletal muscle from NIDDM subjects after in vivo insulin stimulation

M Bjornholm, Y Kawano, M Lehtihet and JR Zierath
Department of Clinical Physiology, Karolinska Hospital, Stockholm, Sweden.

We examined the effect of physiological hyperinsulinemia on insulin receptor substrate-1 (IRS-1) tyrosine phosphorylation and phosphatidylinositol (PI) 3-kinase activity in skeletal muscle from six lean-to-moderately obese NIDDM patients and six healthy subjects. A rise in serum insulin levels from approximately 60 to approximately 650 pmol/l increased IRS-1 tyrosine phosphorylation sixfold over basal levels in control muscle (P < 0.01), whereas no significant increase was noted in NIDDM muscle. The reduced IRS-1 phosphorylation in the NIDDM muscle was not related to changes in IRS-1 protein content, since IRS-1 protein expression was similar between control and NIDDM subjects (16.0 +/- 1.7 vs. 22.9 +/- 4.0 arbitrary units/mg protein for control and NIDDM, respectively; NS). Physiological hyperinsulinemia increased PI 3-kinase activity in control muscle twofold (P < 0.01), whereas no increase in insulin-stimulated PI 3-kinase activity was noted in the NIDDM muscle. Furthermore, in vitro insulin-stimulated (600 pmol/l) 3-O-methylglucose transport was 40% lower in isolated muscle from NIDDM subjects (P < 0.05). The present findings couple both reduced insulin-stimulated IRS-1 tyrosine phosphorylation and PI 3-kinase activity to the impaired insulin-stimulated glucose transport in skeletal muscle from lean-to-moderately obese NIDDM subjects.
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