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Antagonist with Antiobesity and Antidiabetic Activity
Institut de biologie animale (J.R., L.M., P.E., B.D., W.W.), Université de Lausanne, CH-1015 Lausanne, Switzerland; and Ilex Oncology (F.T., E.N.), CH-1290 Versoix/Geneva, Switzerland
Address all correspondence and requests for reprints to: Pr. Walter Wahli, Institut de biologie animale, Université de Lausanne, Bâtiment de biologie, CH-1015 Lausanne, Switzerland. E-mail: Walter.Wahli{at}iba.unil.ch.
Peroxisome proliferator-activated receptor
(PPAR-
) plays a key role in adipocyte differentiation and insulin sensitivity. Its synthetic ligands, the thiazolidinediones (TZD), are used as insulin sensitizers in the treatment of type 2 diabetes. These compounds induce both adipocyte differentiation in cell culture models and promote weight gain in rodents and humans. Here, we report on the identification of a new synthetic PPAR
antagonist, the phosphonophosphate SR-202, which inhibits both TZD-stimulated recruitment of the coactivator steroid receptor coactivator-1 and TZD-induced transcriptional activity of the receptor. In cell culture, SR-202 efficiently antagonizes hormone- and TZD-induced adipocyte differentiation. In vivo, decreasing PPAR
activity, either by treatment with SR-202 or by invalidation of one allele of the PPAR
gene, leads to a reduction of both high fat diet-induced adipocyte hypertrophy and insulin resistance. These effects are accompanied by a smaller size of the adipocytes and a reduction of TNF
and leptin secretion. Treatment with SR-202 also dramatically improves insulin sensitivity in the diabetic ob/ob mice. Thus, although we cannot exclude that its actions involve additional signaling mechanisms, SR-202 represents a new selective PPAR
antagonist that is effective both in vitro and in vivo. Because it yields both antiobesity and antidiabetic effects, SR-202 may be a lead for new compounds to be used in the treatment of obesity and type 2 diabetes.
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