Macrophage Sphingosine 1-Phosphate Receptor 2 Blockade Attenuates Liver Inflammation and Fibrogenesis Triggered by NLRP3 Inflammasome

被引:88
作者
Hou, Lei [1 ]
Yang, Le [1 ]
Chang, Na [1 ]
Zhao, Xinhao [1 ]
Zhou, Xuan [1 ]
Dong, Chengbin [2 ]
Liu, Fuquan [2 ]
Yang, Lin [1 ]
Li, Liying [1 ]
机构
[1] Capital Med Univ, Dept Cell Biol, Municipal Lab Liver Protect & Regulat Regenerat, Beijing, Peoples R China
[2] Capital Med Univ, Dept Intervent Therapy, Beijing Shijitan Hosp, Beijing, Peoples R China
关键词
macrophage; NLR family pyrin domain-containing 3; inflammation; sphingosine; 1-phosphate; S1P receptor 2; liver injury; HEPATOCYTE PYROPTOSIS; SPHINGOSINE-1-PHOSPHATE; FIBROSIS; ACTIVATION; INJURY; CELLS; PARTICLES; RESPONSES; SIRNA; AXIS;
D O I
10.3389/fimmu.2020.01149
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
NLR family pyrin domain containing 3 (NLRP3) inflammasome accompanies chronic liver injury and is a critical mediator of inflammation-driven liver fibrosis. Sphingosine 1-phosphate (S1P)/S1P Receptor (S1PR) signaling participates in liver fibrogenesis by affecting bone marrow (BM)-derived monocytes/macrophage (BMM) activation. However, the relationship between S1P/S1PR signaling and NLRP3 inflammasome in BMMs remains unclear. Here, we found significantly elevated gene expression of NLRP3 inflammasome components (NLRP3, pro-interleukin-1 beta, and pro-interleukin-18) and the activation of NLRP3 inflammasome significantly elevated during murine chronic liver injury induced by a bile duct ligation operation, a methionine-choline-deficient and high-fat diet, or carbon tetrachloride intraperitoneal injection. Moreover, the increased expression of sphingosine kinase 1 (SphK1), the rate-limiting synthetic enzyme of S1P, was positively correlated with NLRP3 inflammasome components in both patients and mouse model livers. Flow cytometry analysis and immunofluorescence staining showed BMMs contributed to the significant proportion of NLRP3(+)cells in murine inflammatory livers, but not Kupffer cells, dendritic cells, endothelial cells, T cells, and hepatocytes. Focusing on macrophages, S1P promoted NLRP3 inflammasome priming and activation in a dose-dependent manner. Blockade of S1PR(2)by JTE-013 (antagonist of S1PR(2)) or S1PR(2)-siRNA inhibited S1P-induced NLRP3 inflammasome priming and inflammatory cytokine (interleukin-1 beta and interleukin-18) secretion, whereas blockade of S1PR(1)or S1PR(3)had no such effect.in vivo, a beta 1,3-d-glucan-encapsulated siRNA particle (GeRP) delivery system is capable of silencing genes in macrophages specifically. Treatment with S1PR(2)siRNA-GeRPs markedly reduced NLRP3 inflammasome priming and activation and attenuated liver inflammation and fibrosis. Together, the conclusions indicated that targeting macrophage S1PR(2)retarded liver inflammation and fibrogenesis via downregulating NLRP3 inflammasome, which may represent an effective therapeutic strategy for chronic liver injury.
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页数:17
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