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Institut National de la Santé et de la Recherche Médicale, Unité 418-Institut National de la Recherche Agronomique Unité Mixte de Recherche 1245 and Institut Fédératif de Recherche 62, Hôpital Debrousse and Claude Bernard University (R.C.M., A.B., J.T., P.D., D.N., M.B.), 69005 Lyon, France; Molecular Diagnostic Laboratory, Aarhus University Hospital/Skejby (K.B.-D., T.F.O.), 8200 Aarhus, Denmark; and Institute of Biochemistry Food Science and Nutrition, Faculty of Agriculture, Hebrew University (A.G.), 76100 Rehovot, Israel
Address all correspondence and requests for reprints to: Dr. Martine Bégeot, Institut National de la Santé et de la Recherche Médicale, Unité 418-Institut National de la Recherche Agronomique Unité Mixte de Recherche 1245, Hôpital Debrousse, 29 rue Soeur Bouvier, 69322, Lyon Cedex 05, France. E-mail: begeot{at}lyon.inserm.fr.
In the present study we developed a model of diet-induced obesity (DIO) in male C57 BL/6J mice using an 8-wk high fat diet. This model should better reflect the physiology of the majority of the human obese patients than mouse genetic models of obesity with defects in leptin or leptin signaling. At the end of the diet, DIO mice displayed an increased weight (20%) and higher leptin, insulin, glucose, and corticosterone plasma levels compared with mice fed a standard diet during the same period. Moreover, they became resistant to the central effect of peripheral administration of leptin. Oligonucleotide microarray studies were conducted in adipose tissue. They showed that a great number of genes are differentially expressed. The majority of these genes (69%) are down-regulated in DIO mice. Among those are genes encoding enzymes of the lipid metabolism or markers of adipocyte differentiation, enzymes involved in detoxification processes, as well as structural components of the cytoskeleton. Some other groups of genes displayed increased expression, such as those encoding inflammatory markers. The results of the microarray analysis were confirmed by semiquantitative RT-PCR studies run on a selected number of genes that were differentially expressed or not modified.
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