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Abstract
The farnesoid X receptor (FXR) has been suggested to play a role in gluconeogenesis. To determine whether FXR modulates the response to fasting in vivo, FXR-deficient (FXR −/−) and wild-type mice were submitted to fasting for 48 h. Our results demonstrate that FXR modulates the kinetics of alterations of glucose homeostasis during fasting, with FXR −/− mice displaying an early, accelerated hypoglycaemia response. Basal hepatic glucose production rate was lower in FXR −/− mice, together with a decrease in hepatic glycogen content. Moreover, hepatic PEPCK gene expression was transiently lower in FXR −/−mice after 6 h of fasting and was decreased in FXR −/−hepatocytes. FXR therefore plays an unexpected role in the control of fuel availability upon fasting.
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