Abstract | BACKGROUND: METHODS: We conducted liver tissue experiments, animal experiments, serum marker testing, liver histology analysis, Kupffer cell experiments, RNA extraction and Real-time PCR, western blotting, evaluation of ROS production by flow cytometry and statistical differences were analyzed by student t-test using GraphPad Prism. RESULTS: We found that serum bile acid (BA) and TGR5 levels were elevated in patients with cholestasis cirrhosis. Knockout of TGR5 in animals significantly increased bile duct ligation (BDL)-caused liver injury through increasing oxidative stress, promoting M1-predominant polarization of Kupffer cells, and elevating the serum levels of inflammatory cytokines. In contrast, TGR5 activation inhibited ROS production, secretion of pro-inflammatory cytokines, and M1-predominant polarization of Kupffer cells. Moreover, results showed that TGR5 exerted its effects via suppressing NF-κB signaling and activating nuclear factor 2 (Nrf2)/HO-1 signaling. Finally, the effect of TGR5 on cholestatic liver damage was also confirmed in vivo. CONCLUSIONS: TGR5 activation protected against BDL-induced CLD by both suppressing inflammation via inhibiting the NF-κB pathway and reducing ROS production via activation of Nrf2/HO-1 signaling. These findings show the importance of TGR5 in CLD and provide new insight into therapeutic strategies for CLD.
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Authors | Haojun Yang, Fengyong Luo, Yi Wei, Yuwen Jiao, Jun Qian, Shuai Chen, Yu Gong, Liming Tang |
Journal | Annals of translational medicine
(Ann Transl Med)
Vol. 9
Issue 14
Pg. 1158
(Jul 2021)
ISSN: 2305-5839 [Print] China |
PMID | 34430599
(Publication Type: Journal Article)
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Copyright | 2021 Annals of Translational Medicine. All rights reserved. |