动脉粥样硬化中CARHSP1基因的表达对缺氧诱导的血管内皮细胞活力凋亡及免疫因子的影响

目的:探讨动脉粥样硬化斑块中钙调节热稳定蛋白1(CARHSP1)基因的表达对缺氧诱导的血管内皮细胞活力、凋亡及白细胞介素6(IL-6)和C-反应蛋白(CRP)表达的影响。方法:用Western blot检测动脉粥样硬化斑块中CARHSP1的蛋白表达;缺氧处理人脐静脉内皮细胞(HUVECs),将细胞分为正常培养组、缺氧组、缺氧+CARHSP1-siRNA组和缺氧+pc DNA3. 1-CARHSP1组,用CCK-8法及流式细胞术分别检测各组细胞活力及凋亡率; RT-PCR检测IL-6和CRP的表达; Western blot检测凋亡蛋白caspase-3、cleaved caspase-3、Bcl-2和Bax的蛋白水平。结果:CARHSP1在动脉粥样硬化斑块中的蛋白表达显著高于对照组(P <0. 05);缺氧可明显增加CARHSP1的表达。缺氧组HUVECs活力及Bcl-2表达显著低于正常培养组,细胞凋亡率及IL-6、CRP、cleaved caspase-3和Bax的蛋白水平显著高于正常培养组(P <0. 05);与缺氧组比较,缺氧+CARHSP1-siRNA组的活力及Bcl-2表达显著升高,细胞凋亡率及IL-6、CRP、cleaved caspase-3和Bax的蛋白水平显著降低(P <0. 05),pc DNA3. 1-CARHSP1组的细胞活力及Bcl-2表达显著降低,细胞凋亡率及IL-6、CRP、cleaved caspase-3和Bax表达显著升高(P <0. 05)。结论:CARHSP1在动脉粥样硬化斑块中表达升高,抑制CARHSP1表达可提高HUVECs的活力,降低细胞凋亡,下调免疫因子IL-6和CRP的表达,而过表达CARHSP1则反之。

Effects of CARHSP1 gene expression on viability,apoptosis and immune factors of vascular endothe-lial cells induced by hypoxia in atherosclerosis

AIM: To investigate the effect of calcium-regulated heat stable protein 1 (CARHSP1) gene expression on the viability, apoptosis and expression of interleukin-6 (IL-6) and C-reactive protein (CRP) in vascular endothe-lial cells induced by hypoxia.METHODS: The protein expression of CARHSP1 was detected by Western blot in atherosclerotic plaques. Human umbilical vein endothelial cells (HUVECs) were treated with hypoxia, and the cells were divided into normal culture group, hypoxia group, hypoxia+CARHSP1-siRNA group and hypoxia+pcDNA3.1-CARHSP1 group. The viability and apoptotic rate of the HUVECs were measured by CCK-8 assay and flow cytometry, respectively. The mRNA expression of IL-6 and CRP was detected by RT-PCR. The protein levels of caspase-3, cleaved caspase-3, Bcl-2 and Bax were determined by Western blot.RESULTS: The protein expression of CARHSP1 in atherosclerotic plaques was significantly higher than that in control group (P<0.05). Hypoxia significantly increased the expression of CARHSP1. The cell viability and the protein expression of Bcl-2 were significantly lower in hypoxia group than those in normal culture group (P<0.05). The apoptotic rate and the protein levels of IL-6, CRP, cleaved caspase-3 and Bax were significantly higher than those in normal culture group (P<0.05). Compared with hypoxia group, the cell viability and protein expression of Bcl-2 were significantly increased in hypoxia+CARHSP1-siRNA group, while the apoptotic rate and the protein levels of IL-6, CRP, cleaved caspase-3 and Bax were decreased significantly (P<0.05). The cell viability and protein expression of Bcl-2 were decreased significantly in hypoxia+pcDNA3.1-CARHSP1 group, while the apoptotic rate and the protein le-vels of IL-6, CRP, cleaved caspase-3 and Bax were increased significantly (P<0.05).CONCLUSION: The expression of CARHSP1 is increased in atherosclerotic plaques, and inhibition of CARHSP1 expression improves the viability, reduces the apoptosis, and down-regulates the expression of IL-6 and CRP in the HUVECs. Over-expression of CARHSP1 exerts the opposite effect.