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TGR5 in cholangiocytes
Verena Keitel1, Dieter Häussinger
1Clinic for Gastroenterology, Hepatology and Infectious Diseases, Heinrich-Heine-University, Düsseldorf, Germany.
Purpose Of Review:
TGR5 (Gpbar-1) is an emerging drug target for metabolic, intestinal and liver diseases. In liver, the highest expression of TGR5 is found in biliary epithelial cells. This review focusses on the function of TGR5 in cholangiocytes and the potential role of the receptor in biliary diseases.
Recent Findings:
TGR5 is localized in the primary cilium and the apical membrane domain of cholangiocytes, where the receptor exerts secretory, proliferative and antiapoptotic effects. Recent human and animal studies using bile acid analogues suggest a therapeutic potential for TGR5 in primary biliary cirrhosis but not in primary sclerosing cholangitis.
Summary:
TGR5 has protective functions in cholangiocytes. Further studies are needed to determine the therapeutic potential of TGR5 agonists and antagonists in biliary diseases.
Insights
TGR5 (Gpbar-1) is a receptor in liver cells that shows protective functions in biliary diseases. Further research is needed to explore its therapeutic potential for conditions like primary biliary cirrhosis.
Area of Science:
- Hepatology
- Gastroenterology
- Cell Biology
Background:
- TGR5 (Gpbar-1) is a G protein-coupled receptor with emerging therapeutic relevance.
- Highest TGR5 expression in the liver is observed in biliary epithelial cells (cholangiocytes).
Purpose of the Study:
- To review the function of TGR5 in cholangiocytes.
- To evaluate the potential role of TGR5 in biliary diseases.
Main Methods:
- Review of recent human and animal studies.
- Analysis of TGR5 localization and effects in cholangiocytes.
Main Results:
- TGR5 is localized to the primary cilium and apical membrane of cholangiocytes.
- TGR5 activation demonstrates secretory, proliferative, and antiapoptotic effects in cholangiocytes.
- Evidence suggests therapeutic potential for TGR5 in primary biliary cirrhosis, but not primary sclerosing cholangitis.
Conclusions:
- TGR5 exhibits protective functions within cholangiocytes.
- Further investigation is required to establish the therapeutic utility of TGR5 agonists and antagonists in managing biliary diseases.
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