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  • Korach-Andre, M, et al. (författare)
  • Liver X receptors regulate de novo lipogenesis in a tissue-specific manner in C57BL/6 female mice
  • 2011
  • Ingår i: American journal of physiology. Endocrinology and metabolism. - : American Physiological Society. - 1522-1555 .- 0193-1849. ; 301:1, s. E210-E222
  • Tidskriftsartikel (refereegranskat)abstract
    • The liver X receptors (LXRs) play a key role in cholesterol and bile acid metabolism but are also important regulators of glucose metabolism. Recently, LXRs have been proposed as a glucose sensor affecting LXR-dependent gene expression. We challenged wild-type (WT) and LXRαβ−/−mice with a normal diet (ND) or a high-carbohydrate diet (HCD). Magnetic resonance imaging showed different fat distribution between WT and LXRαβ−/−mice. Surprisingly, gonadal (GL) adipocyte volume decreased on HCD compared with ND in WT mice, whereas it slightly increased in LXRαβ−/−mice. Interestingly, insulin-stimulated lipogenesis of isolated GL fat cells was reduced on HCD compared with ND in LXRαβ−/−mice, whereas no changes were observed in WT mice. Net de novo lipogenesis (DNL) calculated from V̇o2and V̇co2was significantly higher in LXRαβ−/−than in WT mice on HCD. Histology of HCD-fed livers showed hepatic steatosis in WT mice but not in LXRαβ−/−mice. Glucose tolerance was not different between groups, but insulin sensitivity was decreased by the HCD in WT but not in LXRαβ−/−mice. Finally, gene expression analysis of adipose tissue showed induced expression of genes involved in DNL in LXRαβ−/−mice compared with WT animals as opposed to the liver, where expression of DNL genes was repressed in LXRαβ−/−mice. We thus conclude that absence of LXRs stimulates DNL in adipose tissue, but suppresses DNL in the liver, demonstrating opposite roles of LXR in DNL regulation in these two tissues. These results show tissue-specific regulation of LXR activity, a crucial finding for drug development.
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