大麻素受体1通过G_(αi/o)/RhoA信号通路促进急性肺损伤小鼠巨噬细胞M1极化  

Cannabinoid receptor 1 promotes M1 polarization of macrophages through the G_(αi/o)/RhoA signaling pathway in mice with acute lung injury

作　　者：马秀珍 周妮 郭思琪 王源媛 麦平[1,2] MA Xiuzhen;ZHOU Ni;GUO Siqi;WANG Yuanyuan;MAI Ping(The First School of Clinical Medicine,Lanzhou University,Lanzhou 730099,China;Department of Gastroenterology,Gansu Provincial People's Hospital,Lanzhou 730030,China;Xi'an International Medical Center Hospital,Shaanxi Province,Xi'an 710100,China;The First Clinical Medical College of Gansu University of Traditional Chinese Medicine,Lanzhou 730000,China;Jiangsu University School of Medicine,Zhenjiang 212013,China)

机构地区：[1]兰州大学第一临床医学院,兰州730099 [2]甘肃省人民医院消化内科,兰州730030 [3]陕西省西安国际医学中心医院,西安710100 [4]甘肃中医药大学第一临床医学院,兰州730000 [5]江苏大学医学院,镇江212013

出　　处：《上海交通大学学报(医学版)》2025年第2期161-168,共8页Journal of Shanghai Jiao tong University:Medical Science

基　　金：甘肃省自然科学基金(21JR1RA014)。

摘　　要：目的·探讨阻断大麻素受体1(cannabinoid receptor 1,CB1)对小鼠急性肺损伤(acute lung injury,ALI)的影响及其潜在的分子机制。方法·将40只小鼠随机分为空白对照组、AM281(CB1拮抗剂)对照组、脂多糖(lipopolysaccharide,LPS)组、LPS+AM281组,每组10只。利用LPS诱导建立小鼠ALI模型。经苏木精-伊红(hematoxylin and eosin,H-E)染色观察各组小鼠肺组织病理表现并计算炎症评分。通过反转录和实时荧光定量聚合酶链反应(real-time fluorescent quantitative polymerase chain reaction,qPCR)检测各组小鼠肺巨噬细胞M1型标志物[肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)、白细胞介素-1β(interleukin-1β,IL-1β)、IL-12]和M2型标志物[精氨酸酶(arginase,Arg)、甘露糖受体C型2(mannose receptor,C type 2,Mrc2)、巨噬细胞半乳糖型凝集素1(macrophage galactose-type lectin 1,Mgl1)]的mRNA水平。体外培养人髓系白血病单核细胞THP-1,通过免疫荧光技术检测THP-1细胞中CB1和CB2的表达,并在进一步阻断CB1及抑制G_(αi/o)/RhoA信号通路后,检测M1型标志物的mRNA水平。结果·LPS组小鼠肺组织损伤明显,炎症评分明显升高;阻断CB1后,与LPS组相比,LPS+AM281组小鼠肺损伤得到改善,表现为肺泡壁毛细血管充血改善、肺间质及肺泡腔内炎症细胞浸润减少,炎症评分下降(P=0.007)。与对照组相比,LPS组小鼠肺组织中M1型标志物水平上调,而在阻断CB1后巨噬细胞极性发生改变,M1/M2比例发生反转(均P<0.05)。体外研究发现,巨噬细胞表达CB1和CB2,利用花生四烯基-2-氯乙酰胺(arachidonyl-2-chloroethylamide,ACEA)激活CB1可上调M1型标志物的表达,阻断CB1及选择性抑制G_(αi/o)/RhoA信号通路后,M1型标志物的表达均明显下调(均P<0.05)。结论·CB1在ALI中通过G_(αi/o)/RhoA信号通路促进巨噬细胞向M1极化,阻断CB1可改善肺损伤。Objective·To explore the effects and potential molecular mechanisms of blocking cannabinoid receptor 1(CB1)in acute lung injury(ALI)in mice.Methods·Forty mice were randomly divided into blank control group,AM281(CB1 antagonist)control group,lipopolysaccharide(LPS)group,and LPS+AM281 group,with ten mice in each group.ALI models were induced by LPS.The pathological manifestations of lung tissues were observed in each group of mice by hematoxylin and eosin(H-E)staining and the inflammation scores were calculated.The mRNA levels of M1 markers[tumor necrosis factor-α(TNF-α),interleukin-1β(IL-1β),IL-12]and M2 markers[arginase(Arg),mannose receptor,C type 2(Mrc2),macrophage galactose-type lectin 1(Mgl1)]in lung macrophages were measured by reverse transcription and real-time fluorescence quantitative polymerase chain reaction(qPCR).Human myeloid leukemia monocytes THP-1 cells were cultured in vitro,and the expression of CB1 and CB2 in THP-1 cells was detected by immunofluorescence.After further blocking CB1 and inhibiting the G_(αi/o)/RhoA signaling pathway,the mRNA levels of M1 markers were assessed.Results·The LPS group showed significant lung tissue damage and a significant increase in inflammation scores in mice.After blocking CB1,compared with the LPS group,the LPS+AM281 group of mice showed improvements in lung injury,manifested as improved congestion of alveolar wall capillaries,reduced infiltration of inflammatory cells in the lung interstitium and alveolar cavity,and a decreased inflammation score(P=0.007).Compared with the control group,the levels of M1 marker in the lung tissue of the LPS group were upregulated,while the polarization of macrophages changed and the M1/M2 ratio was reversed after blocking CB1(all P<0.05).In vitro studies found that macrophages expressed CB1 and CB2.Activation of CB1 by arachidonyl-2-chloroethylamide(ACEA)upregulated the expression of M1 markers.Blocking CB1 and selectively inhibiting G_(αi/o)/RhoA signaling significantly downregulated M1 markers(all P<0.05).Conclusion�

关 键 词：急性肺损伤 大麻素受体1 巨噬细胞 M1极化 G_(αi/o)/RhoA信号通路 

分 类 号：R563.1[医药卫生—呼吸系统]