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This version published online on August 8, 2002
Molecular Endocrinology, doi:10.1210/me.2002-0036
Molecular Endocrinology Vol. 0, No. 2002 200200361-
doi:10.1210/me.2002-0036
Copyright © 2002 by the Endocrine Society.
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Submitted on January 23, 2002
Accepted on July 23, 2002

A NEW SELECTIVE PPAR{gamma} ANTAGONIST WITH ANTI-OBESITY AND ANTI-DIABETIC ACTIVITY

Jennifer Rieusset1, Fethi Touri1, Liliane Michalik1, Pascal Escher1, Béatrice Desvergne1, Eric Niesor1, and Walter Wahli1*

1 Institut de biologie animale, Université de Lausanne, Bâtiment de biologie, CH-1015 Lausanne, Switzerland. Present address : INSERM U449, Faculté de médecine R.T.H. Laennec, rue Guillaume Paradin, 69372 Lyon cedex 08. Ilex onc., rte des Fayards 243, 1290 Versoix/Geneva, Switzerland. Present address :Department of Physiology/Neurobiology, University of Basel, Klingelbergstrasse 50/70, CH-4056 Basel, Switzerland J. Rieusset and F. Touri contributed equally to this work.

* To whom correspondence should be addressed. E-mail: Walter.Wahli{at}iba.unil.ch.

PPAR{gamma} 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{gamma} antagonist, the phosphonophosphate SR-202, which inhibits both TZD-stimulated recruitment of the coactivator SRC-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{gamma} activity, either by treatment with SR-202 or by invalidation of one allele of the PPAR{gamma} 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{alpha} and leptin secretion. Treatment with SR-202 also dramatically improves insulin sensitivity in the diabetic ob/ob mice. Thus, while we cannot exclude that its actions involve additional signaling mechanisms, SR202 represents a new selective PPAR{gamma} antagonist which is effective both in vitro and in vivo. Because it yields both anti-obesity and anti-diabetic effects, SR-202 may be a lead for new compounds to be used in the treatment of obesity and type 2 diabetes.


Key words: SR-202 • PPAR{gamma} antagonist • adipocyte • obesity • insulin resistance

NURSA Molecule Pages Link:

Nuclear Receptors:   PPARα  |  PPARδ  |  PPARγ  |  FXRα
Coregulators:   SRC-1
Ligands:   Pirinixic acid  |  Rosiglitazone



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