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Papers In Press, published online ahead of print January 1, 2005
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UMR INSERM U449/INRA U1235, Laennec Medical faculty, Lyon 69372
Corresponding Author: 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 implication 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 glucose metabolic pathway and fatty acid synthase (FAS) 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-c 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 regulations in rodents. These data enlighten the important role of SREBP-1 not only in the regulation of lipid metabolism, but also of glucose metabolism and energy homeostasis.
Revised on December 17, 2004
Accepted on December 20, 2004
Regulation of SREBP-1 expression and transcriptional action on HKII and FAS genes during fasting and refeeding in rat tissues
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