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Endocrinology, Vol 136, 1474-1481, Copyright © 1995 by Endocrine Society
ARTICLES |
D Szalkowski, S White-Carrington, J Berger and B Zhang
Department of Molecular Endocrinology, Merck Research Laboratories, Rahway, New Jersey 07065.
Tumor necrosis factor-alpha (TNF alpha) is a cytokine implicated in the development of septic shock, cachexia, and other pathological states. Recent studies indicated a direct role for adipose expression of TNF alpha in obesity-linked insulin resistance and diabetes. Pioglitazone, CP-86,325 (CP), AD-5075, CS-045, ciglitazone, and englitazone are members of a new class of insulin-sensitizing thiazolidinedione derivatives with in vivo antidiabetic activities. To test whether these agents antagonize the effect of TNF alpha, 3T3-L1 cells were induced to differentiate in the presence of TNF alpha with or without thiazolidinedione derivatives. Incubation of 3T3-L1 cells with TNF alpha alone completely inhibited adipocyte conversion and expression of fatty acid-binding protein messenger RNA (mRNA). However, coincubation of TNF alpha-treated cells with CP (1 microM), AD-5075 (1 microM), pioglitazone (10 microM), or CS-045 (10 microM) blocked these effects. Long term incubation of 3T3-L1 adipocytes with a low dose of TNF alpha (50 pM) significantly decreased the levels of the adipocyte/muscle- specific glucose transporter (GLUT4) and the CCAAT enhancer-binding protein mRNAs, but did not affect expression of the ubiquitously expressed glucose transporter (GLUT1) or lipoprotein lipase mRNAs. Incubation of 3T3-L1 adipocytes with TNF alpha also inhibited insulin- stimulated 2-deoxyglucose uptake as well as expression of GLUT4 protein. Furthermore, in 3T3-L1 adipocytes, incubation with TNF alpha attenuated the expression of fatty acid-binding protein mRNA in a time- and dose-dependent manner. These inhibitory effects were partially or completely blocked by coincubation of the cells with CP. These results implicate that the insulin-sensitizing agents may exert their antidiabetic activities by antagonizing the inhibitory effects of TNF alpha.
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