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Biochem Biophys Res Commun. 2008 Jul 18;372(1):78-84. doi: 10.1016/j.bbrc.2008.04.171. Epub 2008 May 9.

Expression and function of the bile acid receptor TGR5 in Kupffer cells.

Author information

1
Clinic for Gastroenterology, Hepatology and Infectiology, Heinrich-Heine-University, Moorenstrasse 5, D-40225 Düsseldorf, Germany.

Abstract

Kupffer cells are resident macrophages in the liver and play a central role in the hepatic response to injury. Bile acids can impair macrophage function leading to decreased cytokine release. TGR5 is a novel, membrane-bound bile acid receptor, and it has been suggested that the immunosuppressive effect of bile acids can be mediated by TGR5. However, the function of TGR5 in Kupffer cells has not been studied and a direct link between TGR5 and cytokine production in macrophages has not been established. The present study demonstrates that TGR5 is localized in the plasma membrane of isolated Kupffer cells and is responsive to bile acids. Furthermore, bile acids inhibited LPS-induced cytokine expression in Kupffer cells via TGR5-cAMP dependent pathways. TGR5-immunoreactivity in Kupffer cells was increased in rat livers following bile-duct ligation, suggesting that TGR5 may play a protective role in obstructive cholestasis preventing excessive cytokine production thereby reducing liver injury.

PMID:
18468513
DOI:
10.1016/j.bbrc.2008.04.171
[Indexed for MEDLINE]

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