白三烯B4对巨噬细胞小凹蛋白-1表达的影响及其与冠状动脉斑块不稳定的关系The role of leukotriene B4 on the expression of caveolin-1 in macrophage and its potential association with plaque unstable
王琳,江建军,许莎莎,方崇峰,陈葆国,朱敏,黄维清,唐礼江
摘要(Abstract)：
目的研究小凹蛋白-1(Cav-1)及白三烯B4(LTB4)与冠状动脉斑块不稳定的关系,观察LTB4及其抑制剂对巨噬细胞Cav-1表达的影响并探讨其意义。方法免疫组化检测41例人尸检冠状动脉粥样斑块中巨噬细胞Cav-1蛋白的表达;以流式细胞技术检测167例入选患者外周血单核细胞Cav-1的表达水平,用ELISA检测血清中LB4的表达水平;分别用浓度为10-8mol/L、10-7mol/L的LTB4及10-7mol/LU75302处理THP-1源性的巨噬细胞,RT-PCR检测细胞内的TNF-αmRNA,Cav-1mRNA水平及Western Blot检测Cav-1蛋白表达的变化。结果与稳定斑块相比,不稳定斑块中巨噬细胞聚集处Cav-1表达下调或表达阴性。急性冠脉综合征(ACS)组中急性心梗(AMI)组及不稳定性心绞痛(UAP)组外周血单核细胞Cav-1表达水平皆显著低于稳定心绞痛(SAP)组、非冠心病组(99.2±40.8MnX比(176.1±90.3)MnX、(246.0±122.8)MnX(t=-4.786、5.112),(104.8±37.4)MnX比(176.1±90.3)MnX、(246.0±122.8)MnX(t=-4.508、-4.942,P<0.01);AMI组血清LTB4表达显著高于UAP组、SAP组及非冠心病组(209.8ng/L比40.7ng/L、59.5ng/L、63.8ng/L,Z=-3.771、-3.426、-2.849,P<0.01)。LTB4可下调Cav-1mRNA及蛋白表达水平(0.963、0.959比1.186,t=-5.079、-5.148),0.712比0.840(t=-4.050,P<0.01),上调肿瘤坏死因子-α(TNF-α)mRNA的表达(0.637比0.555)(t=5.148,P<0.01);U75302预处理组Cav-1mRNA及蛋白水平上调(1.089比0.959、0.963(t=3.018、3.087,0.799比0.712,t=2.849,P<0.05),TNF-αmRNA水平下降(0.529比0.637,t=-3.087,P<0.01)。结论冠状动脉不稳定斑块中巨噬细胞及ACS患者外周血单核细胞Cav-1表达降低,AMI患者血清中LTB4表达上调,提示高水平LTB4及低表达Cav-1与斑块不稳定有关。LTB4下调THP-1来源的巨噬细胞Cav-1mRNA及蛋白的表达,上调TNF-αmRNA水平,U75302预处理可拮抗上述LTB4的作用,提示使用拮抗LTB4的药物可能有稳定粥样斑块的作用。
关键词(KeyWords)： 窖蛋白1;白三烯B4;炎症;急性冠脉综合征;外周血单核巨噬细胞系统
基金项目(Foundation): 浙江省科技厅基金资助(2006c33019)
作者(Author): 王琳,江建军,许莎莎,方崇峰,陈葆国,朱敏,黄维清,唐礼江
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