Frontiers in Immunology (Feb 2021)

TGR5 Regulates Macrophage Inflammation in Nonalcoholic Steatohepatitis by Modulating NLRP3 Inflammasome Activation

  • Yong Shi,
  • Yong Shi,
  • Yong Shi,
  • Yong Shi,
  • Yong Shi,
  • Wantong Su,
  • Wantong Su,
  • Wantong Su,
  • Wantong Su,
  • Wantong Su,
  • Lei Zhang,
  • Lei Zhang,
  • Lei Zhang,
  • Lei Zhang,
  • Lei Zhang,
  • Chengyu Shi,
  • Chengyu Shi,
  • Chengyu Shi,
  • Chengyu Shi,
  • Chengyu Shi,
  • Jinren Zhou,
  • Jinren Zhou,
  • Jinren Zhou,
  • Jinren Zhou,
  • Jinren Zhou,
  • Peng Wang,
  • Peng Wang,
  • Peng Wang,
  • Peng Wang,
  • Peng Wang,
  • Hao Wang,
  • Hao Wang,
  • Hao Wang,
  • Hao Wang,
  • Hao Wang,
  • Xiaoli Shi,
  • Xiaoli Shi,
  • Xiaoli Shi,
  • Xiaoli Shi,
  • Xiaoli Shi,
  • Song Wei,
  • Song Wei,
  • Song Wei,
  • Song Wei,
  • Song Wei,
  • Qi Wang,
  • Qi Wang,
  • Qi Wang,
  • Qi Wang,
  • Qi Wang,
  • Johan Auwerx,
  • Kristina Schoonjans,
  • Yue Yu,
  • Yue Yu,
  • Yue Yu,
  • Yue Yu,
  • Yue Yu,
  • Rui Pan,
  • Haoming Zhou,
  • Haoming Zhou,
  • Haoming Zhou,
  • Haoming Zhou,
  • Haoming Zhou,
  • Ling Lu,
  • Ling Lu,
  • Ling Lu,
  • Ling Lu,
  • Ling Lu

DOI
https://doi.org/10.3389/fimmu.2020.609060
Journal volume & issue
Vol. 11

Abstract

Read online

Nonalcoholic steatohepatitis (NASH) is a chronic liver disease associated with dysregulation of liver metabolism and inflammation. G-protein coupled bile acid receptor 1 (TGR5) is a cell surface receptor that is involved in multiple metabolic pathways. However, the functions of TGR5 in regulating macrophage innate immune activation in NASH remain unclear. Here, we found that TGR5 expression was decreased in liver tissues from humans and mice with NASH. Compared to wild type (WT) mice, TGR5-knockout (TGR5−/−) mice exhibited exacerbated liver damage, increased levels of proinflammatory factors, and enhanced M1 macrophage polarization. Moreover, TGR5 deficiency facilitated M1 macrophage polarization by promoting NLRP3 inflammasome activation and caspase-1 cleavage. Taken together, our findings revealed that TGR5 signaling attenuated liver steatosis and inflammation and inhibited NLRP3-mediated M1 macrophage polarization in NASH.

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