Glucose-6-phosphate regulates hepatic bile acid synthesis in mice

Joanne A Hoogerland, Yu Lei, Justina C Wolters, Jan Freark de Boer, Trijnie Bos, Aycha Bleeker, Niels L Mulder, Theo H van Dijk, Jan A Kuivenhoven, Fabienne Rajas, Gilles Mithieux, Rebecca A Haeusler, Henkjan J Verkade, Vincent W Bloks, Folkert Kuipers, Maaike H Oosterveer

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Abstract

It is well-established that, besides facilitating lipid absorption, bile acids act as signaling molecules that modulate glucose and lipid metabolism. Bile acid metabolism, in turn, is controlled by several nutrient-sensitive transcription factors. Altered intrahepatic glucose signaling in type 2 diabetes associates with perturbed bile acid synthesis. However, an independent role of glucose in regulation of bile acid metabolism has as yet not been established. We aimed to characterize the regulatory role of the primary intracellular metabolite of glucose, glucose-6-phosphate (G6P), on bile acid metabolism. Hepatic gene expression patterns and bile acid composition were analyzed in mice that accumulate G6P in the liver, i.e., liver-specific glucose-6-phosphatase knockout (L-G6pc-/- ) mice, and mice treated with a pharmacological inhibitor of the G6P-transporter. Hepatic G6P accumulation induces Cyp8b1 expression, which is mediated by the major glucose-sensitive transcription factor Carbohydrate Response Element Binding Protein (ChREBP). Activation of the G6P-ChREBP-CYP8B1 axis increases the relative abundance of cholic acid-derived bile acids and induces physiologically relevant shifts in bile composition. The G6P-ChREBP-dependent change in bile acid hydrophobicity associates with elevated plasma campesterol/cholesterol ratio and reduced fecal neutral sterol loss, compatible with enhanced intestinal cholesterol absorption. CONCLUSION: We report that G6P, the primary intracellular metabolite of glucose, controls hepatic bile acid synthesis. Our work identifies hepatic G6P-ChREBP-CYP8B1 signaling as a regulatory axis in control of bile acid and cholesterol metabolism. This article is protected by copyright. All rights reserved.

Original languageEnglish
Pages (from-to)2171-2184
Number of pages14
JournalHepatology
Volume70
Issue number6
Early online date18-May-2019
DOIs
Publication statusPublished - Dec-2019

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