沉默TREM-1通过调控NF-κB信号通路抑制氧化三甲胺介导的血管平滑肌细胞炎症  

Silencing triggering receptor expressed on myeloid cells-1 inhibits vascular smooth muscle cell inflammation mediated by trimethylamine N-oxide by regulating the nuclear factor-kappa B signaling pathway

作　　者：谭文云 井淑艳 王蕊蕊 王刚 Tan Wenyun;Jing Shuyan;Wang Ruirui;Wang Gang(Department of Emergency,The First Hospital of Hebei Medical University;Department of Radiology and Nuclear Medicine,The First Hospital of Hebei Medical University;Department of Cardiovascular Medicine,The First Hospital of Hebei Medical University)

机构地区：[1]河北医科大学第一医院急诊科,石家庄050000 [2]河北医科大学第一医院,石家庄050000 [3]河北医科大学第一医院心血管内科,石家庄050000

出　　处：《重庆医科大学学报》2025年第3期337-343,共7页Journal of Chongqing Medical University

基　　金：河北省卫健委医学科学研究课题计划资助项目(编号:20201151)。

摘　　要：目的:探讨髓系细胞触发受体-1(triggering receptors expressed on myeloid cells-1,TREM-1)在氧化三甲胺(trimethylamine oxide,TMAO)介导的大鼠血管平滑肌细胞(vascular smooth muscle cells,VSMCs)炎性反应中的作用及其可能机制。方法:①采用不同浓度(0、100、300、600、900、1200、1500μmol/L)TMAO处理VSMCs 24 h;②将TREM-1基因siRNA干扰质粒(si-TREM-1)及其阴性对照干扰质粒(si-NC)转染至VSMCs中,采用600μmol/L TMAO诱导VSMCs炎性反应,并联合核因子κB(nuclear factor-kappa B,NF-κB)激活剂佛波酯(phorbol myristate acetate,PMA)干预24 h。CCK-8检测细胞增殖活性;ELISA检测细胞上清中白细胞介素(interleukin,IL)-1β、IL-6及肿瘤坏死因子(tumor necrosis factor,TNF)-α水平;定量聚合酶链反应(quantitative polymerase chain reaction,qRT-PCR)检测细胞中TREM-1、环氧化酶-2(cyclooxygenase-2,COX-2)、细胞间黏附分子-1(intercellular adhesion molecule-1,ICAM-1)以及IL-1β、IL-6、TNF-αmRNA表达水平;Western blot检测细胞中TREM-1、COX-2、ICAM-1以及NF-κB p65、p-NF-κB p65(Ser536)蛋白表达水平。结果:不同浓度TMAO处理对VSMCs细胞增殖活性无明显影响(P=0.375),但可明显上调细胞上清中IL-1β、IL-6、TNF-α水平以及细胞中TREM-1、COX-2、ICAM-1等mRNA和蛋白表达水平(均P<0.01),且呈浓度依赖性。沉默TREM-1基因可明显抑制TMAO诱导的VSMCs上清液中IL-1β、IL-6、TNF-α水平的增加,以及细胞中COX-2、ICAM-1、IL-1β、IL-6、TNF-αmRNA和p-NF-κB p65/NF-κB p65蛋白比值的上调(均P<0.01)。然而,PMA干预可明显逆转沉默TREM-1基因对TMAO诱导VSMCs炎性反应的改善作用。结论:沉默TREM-1基因可抑制TMAO诱导的VSMCs炎性反应,其机制可能与抑制NF-κB通路活化有关。Objective:To investigate the role and possible mechanism of triggering receptor expressed on myeloid cells-1(TREM-1)in the inflammatory response of rat vascular smooth muscle cells(VSMCs)mediated by trimethylamine N-oxide(TMAO).Methods:VSMCs were treated with TMAO at different concentrations(0,100,300,600,900,1200,1500μmol/L)for 24 hours.VSMCs were transfected with the siRNA interference plasmid targeting the TREM-1 gene(si-TREM-1)and its negative control interference plasmid(si-NC),and 600μmol/L TMAO was used to induce inflammatory response in VSMCs,combined with the intervention with the nuclear factor-kappa B(NF-κB)activator phorbol myristate acetate(PMA)for 24 hours.CCK-8 assay was used to measure cell proliferative activity;ELISA was used to measure the levels of interleukin-1β(IL-1β),interleukin-6(IL-6),and tumor necrosis factor-α(TNF-α)in cell supernatant;qRT-PCR was used to measure the mRNA expression levels of TREM-1,cyclooxygenase-2(COX-2),intercellular adhesion molecule-1(ICAM-1),IL-1β,IL-6,and TNF-α in cells,and Western blot was used to measure the protein expression levels of TREM-1,COX-2,ICAM-1,NF-κB p65,and p-NF-κB p65(Ser536)in cells.Results:Treatment with TMAO at different concentrations had no significant impact on the proliferative activity of VSMCs(P=0.375),but it significantly upregulated the levels of IL-1β,IL-6,and TNF-α in supernatant and the mRNA and protein expression levels of TREM-1,COX-2,and ICAM-1 in cells(all P<0.01)in a concentration-dependent manner.Silencing of the TREM-1 gene significantly inhibited the increases in the levels of IL-1β,IL-6,and TNF-α in the supernatant of VSMCs induced by TMAO,and it also suppressed the upregulation of the mRNA expression levels of COX-2,ICAM-1,IL-1β,IL-6,and TNF-α and the ratio of p-NF-kB p65/NF-kB p65 in VSMCs(all P<0.01).However,PMA intervention significantly reversed the role of silencing the TREM-1 gene on TMAO-induced inflammatory response in VSMCs.Conclusion:Silencing of the TREM-1 gene can inhibit TMAO-induced inflammato

关 键 词：氧化三甲胺 血管平滑肌细胞 炎性反应 髓系细胞触发受体-1 核因子κB通路 

分 类 号：R322[医药卫生—人体解剖和组织胚胎学]