肺炎衣原体对血管内皮细胞的感染及其对ICAM-1表达的影响

目的:观察肺炎衣原体对人脐静脉内皮细胞(HUVECs)的感染及其对细胞分泌和表达细胞间粘附分子1(ICAM-1)的影响,探讨C.pneumoniae感染在动脉粥样硬化形成中的作用及其可能机制。方法:用人喉表皮癌(HEP-2)细胞培养C.pneumoniae,以C.pneumoniae感染HUVE细胞,经透射电镜及PCR检测有无感染。用流式细胞仪检测感染前后HUVE细胞表面ICAM-1蛋白的表达的变化,用荧光定量RT-PCR检测ICAM-1mRNA的变化。结果:C.pneumoniae能感染体外培养的HUVE细胞;感染后12h,细胞表面ICAM-1蛋白的表达即增加,其峰值约在感染后24h;荧光定量RT-PCR结果显示其增加在mRNA水平。结论:C.pneumoniae能感染体外培养的人脐静脉内皮细胞并增加ICAM-1的表达,提示C.pneumoniae感染可能是动脉粥样硬化的始动因子之一,其致动脉粥样硬化机制可能与感染后血管内皮细胞粘附分子表达的增加有关。

Chlamydia pneumoniae enhanced the expression of ICAM-1 in cultured human umbilical vein endothelial cells

AIM: To investigated the effects of Chlamydia pneumoniae (C.pneumoniae) infection on the expression of intercellular adhesion molecule-1 (ICAM-1) in cultured human umbilical vein endothelial cells (HUVECs). METHODS: After propagated in HEP-2 cells, C. pneumoniae organisms were infected to HUVECs. The infection was assessed by ectromicroscope and PCR. The expression of ICAM-1 on HUVECs was detected by flow cytometry before infection and 12 h, 24 h, 48 h, 72 h after infection. RT-PCR was used to detect the ICAM-1 mRNA expression. RESULTS: C.pneumoniae was able to infect cultured HUVECs. After infection, the expression of ICAM-1 on the surface of cultured HUVECs was increased,, the peak was at the time of about 24-48 h; The light quantative RT-PCR analysis demonstrated that the infection also enhanced the ICAM-1 mRNA expression. CONCLUSION: The ability of C.pneumoniae to grow in HUVECs and to stimulate the expression of ICAM-1 protein and mRNA suggests that C.pneumoniae may play a role in atheriosclerosis.