Skeletal muscle peroxisome proliferator- activated receptor-gamma expression in obesity and non- insulin-dependent diabetes mellitus

The Journal of Clinical Investigation
Y T KruszynskaJ Olefsky

Abstract

The two isoforms of peroxisome proliferator-activated receptor-gamma (PPARgamma1 and PPARgamma2), are ligand-activated transcription factors that are the intracellular targets of a new class of insulin sensitizing agents, the thiazolidinediones. The observation that thiazolidinediones enhance skeletal muscle insulin sensitivity in obesity and in patients with non-insulin-dependent diabetes mellitus (NIDDM), by activating PPARgamma, and possibly by inducing its expression, suggests that PPARgamma expression in skeletal muscle plays a key role in determining tissue sensitivity to insulin, and that PPARgamma expression may be decreased in insulin resistant subjects. We used a sensitive ribonuclease protection assay, that permits simultaneous measurement of the two isoforms, to examine the effects of obesity and NIDDM, and the effects of insulin, on skeletal muscle levels of PPARgamma1 and PPARgamma2 mRNA. We studied seven patients with NIDDM (body mass index, 32+/-1 kg/m2), seven lean (24+/-1 kg/m2), and six obese (36+/-1 kg/m2) normal subjects. Biopsies from the vastus lateralis muscle were taken before and after a 5-h hyperinsulinemic (80 mU/m2 per minute) euglycemic clamp. The obese controls and NIDDM patients were insulin resi...Continue Reading

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