TY - JOUR
T1 - Lipid receptor G2A-mediated signal pathway plays a critical role in inflammatory response by promoting classical macrophage activation
AU - Li, Qing
AU - Feng, Chunlei
AU - Li, Lingyun
AU - Xu, Guiliang
AU - Gu, Haijuan
AU - Li, Shiqiang
AU - Li, Dali
AU - Liu, Mingyao
AU - Han, Shuhua
AU - Zheng, Biao
N1 - Publisher Copyright:
Copyright © 2021 by The American Association of Immunologists, Inc.
PY - 2021/5/15
Y1 - 2021/5/15
N2 - Macrophage polarization is a dynamic and integral process in tissue inflammation and remodeling. In this study, we describe that lipoprotein-associated phospholipase A2 (Lp-PLA2) plays an important role in controlling inflammatory macrophage (M1) polarization in rodent experimental autoimmune encephalomyelitis (EAE) and in monocytes from multiple sclerosis (MS) patients. Specific inhibition of Lp-PLA2 led to an ameliorated EAE via markedly decreased inflammatory and demyelinating property of M1. The effects of Lp-PLA2 on M1 function were mediated by lysophosphatidylcholine, a bioactive product of oxidized lipids hydrolyzed by Lp-PLA2 through JAK2-independent activation of STAT5 and upregulation of IRF5. This process was directed by the G2A receptor, which was only found in differentiated M1 or monocytes from MS patients. M1 polarization could be inhibited by a G2A neutralizing Ab, which led to an inhibited disease in rat EAE. In addition, G2A-deficient rats showed an ameliorated EAE and an inhibited autoimmune response. This study has revealed a mechanism by which lipid metabolites control macrophage activation and function, modification of which could lead to a new therapeutic approach for MS and other inflammatory disorders.
AB - Macrophage polarization is a dynamic and integral process in tissue inflammation and remodeling. In this study, we describe that lipoprotein-associated phospholipase A2 (Lp-PLA2) plays an important role in controlling inflammatory macrophage (M1) polarization in rodent experimental autoimmune encephalomyelitis (EAE) and in monocytes from multiple sclerosis (MS) patients. Specific inhibition of Lp-PLA2 led to an ameliorated EAE via markedly decreased inflammatory and demyelinating property of M1. The effects of Lp-PLA2 on M1 function were mediated by lysophosphatidylcholine, a bioactive product of oxidized lipids hydrolyzed by Lp-PLA2 through JAK2-independent activation of STAT5 and upregulation of IRF5. This process was directed by the G2A receptor, which was only found in differentiated M1 or monocytes from MS patients. M1 polarization could be inhibited by a G2A neutralizing Ab, which led to an inhibited disease in rat EAE. In addition, G2A-deficient rats showed an ameliorated EAE and an inhibited autoimmune response. This study has revealed a mechanism by which lipid metabolites control macrophage activation and function, modification of which could lead to a new therapeutic approach for MS and other inflammatory disorders.
UR - https://www.scopus.com/pages/publications/85106539146
U2 - 10.4049/JIMMUNOL.2000231
DO - 10.4049/JIMMUNOL.2000231
M3 - 文章
C2 - 33941654
AN - SCOPUS:85106539146
SN - 0022-1767
VL - 206
SP - 2338
EP - 2352
JO - Journal of Immunology
JF - Journal of Immunology
IS - 10
ER -