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Unité Mixte de Recherche Institut National de la Santé et de la Recherche Médicale-U449/Institut National de la Recherche Agronomique-U1235, Institut Fédératif de Recherche (IFR) Laennec, Faculté de Médecine René Laennec, Université Claude Bernard Lyon-1, 69372 Lyon, Cedex 08, France
1 To whom correspondence should be addressed. e-mail: vidal{at}laennec.univ-lyon1.fr
The sterol regulatory element binding protein 1 (SREBP-1) is regarded as a major factor involved in the nutritional regulation of lipogenesis. The aim of the present work was to demonstrate its involvement in the response of key genes of glucose and lipid metabolism in liver, adipose tissue, and skeletal muscle during fasting and refeeding. The regulation of hexokinase-2 (HKII) was investigated as a marker of the glucose metabolic pathway and that of FAS was investigated as a marker of the lipogenic pathway. The in vivo association of SREBP-1 with the promoter regions of these genes was determined in the different tissues using chromatin immunoprecipitation assays. Fasting decreased, and refeeding restored, FAS and HKII mRNA and protein levels in each tissue. The concomitant measurement of SREBP-1a and SREBP-1c mRNA levels, of mature SREBP-1 protein abundance in nuclear extracts, and of SREBP-1 interaction with target promoters led to the conclusion that SREBP-1 plays a major role in the response of FAS and HKII genes to nutritional regulation in rodents.
These data elucidate the important role of SREBP-1 not only in the regulation of lipid metabolism but also of glucose metabolism and energy homeostasis.
Supplementary key words nutritional regulation • glucose metabolism • chromatin immunoprecipitation • gene expression • quantitative reverse transcriptase-polymerase chain reaction • lipogenesis • sterol regulatory element binding protein 1 • hexokinase-2 • fatty acid synthase
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