The G protein–coupled receptor G2A

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Abstract
The G2A receptor is a member of the ovarian cancer G protein–coupled receptor 1 family of stress-inducible G protein–coupled receptors. In this study, we examined the hepatobiliary effects of loss of function of G2A in mice fed either a chow or lithogenic diet. G2A-deficient (G2A−/−) mice fed chow had a 25% reduction in biliary phosphatidylcholine content, reduced hepatic gene expression of the phosphatidylcholine transporter adenosine triphosphate–binding cassette B4, and an 8-fold increase in expression of the nuclear receptor liver X receptor (LXR). Despite the increased expression of LXR, transcription of several LXR target genes was reduced. G2A−/− mice fed a lithogenic diet had rapid gallstone formation, an increased cholesterol saturation index, a 2.5-fold increase in farnesoid X receptor expression, a 5-fold increase in LXR expression, and a 90% reduction in cholesterol 7α-hydroxylase expression in comparison with wild-type mice. There were no changes in gallbladder volume. Conclusion: These data demonstrate that the G2A receptor is important for hepatobiliary bile salt, cholesterol, and phospholipid homeostasis and for the pathogenesis of cholesterol gallstone formation. (HEPATOLOGY 2008;48:1138–1148.)