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  • Title: FXR-deficiency confers increased susceptibility to torpor.
    Author: Cariou B, Bouchaert E, Abdelkarim M, Dumont J, Caron S, Fruchart JC, Burcelin R, Kuipers F, Staels B.
    Journal: FEBS Lett; 2007 Nov 13; 581(27):5191-8. PubMed ID: 17950284.
    Abstract:
    The role of the nuclear receptor FXR in adaptive thermogenesis was investigated using FXR-deficient mice. Despite elevated serum bile acid concentrations and increased mRNA expression profiles of thermogenic genes in brown adipose tissue, FXR-deficiency did not alter energy expenditure under basal conditions. However, FXR-deficiency accelerated the fasting-induced entry into torpor in a leptin-dependent manner. FXR-deficient mice were also extremely cold-intolerant. These altered responses may be linked to a more rapid decrease in plasma concentrations of metabolic fuels (glucose, triglycerides) thus impairing uncoupling protein 1-driven thermogenesis. These results identify FXR as a modulator of energy homeostasis.
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