首页> 外文期刊>Redox report: communications in free radical research >7-Ketocholesterol enhances the expression of adhesion molecules on human aortic endothelial cells by increasing the production of reactive oxygen species
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7-Ketocholesterol enhances the expression of adhesion molecules on human aortic endothelial cells by increasing the production of reactive oxygen species

机译:7-酮胆固醇通过增加活性氧的产生来增强人主动脉内皮细胞上粘附分子的表达

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The aim of the present study was to assess the expression of intracellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1), monocytic adhesion of human aortic endothelial cells (HAECs), and the production of intracellular reactive oxygen species (ROS), when HAECs were stimulated by 7-ketocholesterol. 7-ketocholesterol enhances surface expression of ICAM-1 and VCAM-1 as determined by EIA, induces their mRNA expression by RT-PCR, and stimulates adhesiveness of HAECs to U937 monocytic cells. We confirmed up-regulation of ROS production of HAECs treated with 7-ketocholesterol. Although the surface expression of ICAM-1 and VCAM-1 on HAECs treated with 7-ketocholesterol increased in a time-dependent manner, α-tocopherol inhibited this increase of the surface expression of ICAM-1 and VCAM-1. In the monocytic adhesion assay, adhesion of U937 to HAECs treated with 7-ketocholesterol was enhanced, but monoclonal anti-ICAM-1 and VCAM-1 antibodies reduced the endothelial adhesiveness. In conclusion, this study suggests that the endothelial adhesiveness to monocytic cells that was increased by 7-ketocholesterol was associated with enhanced expression of ICAM-1 and VCAM-1 mediated by ROS production.
机译:本研究的目的是评估细胞内黏附分子1(ICAM-1)和血管细胞黏附分子1(VCAM-1)的表达,人主动脉内皮细胞(HAECs)的单核细胞黏附以及其产生。当HAECs被7-酮胆固醇刺激时,细胞内活性氧(ROS)升高。 7-酮胆固醇可增强EIA检测的ICAM-1和VCAM-1的表面表达,通过RT-PCR诱导其mRNA表达,并刺激HAEC与U937单核细胞的粘附性。我们证实了用7-酮胆固醇治疗的HAEC的ROS产生上调。尽管用7-酮胆固醇治疗的HAEC上ICAM-1和VCAM-1的表面表达呈时间依赖性增加,但α-生育酚抑制了ICAM-1和VCAM-1的这种表面表达的增加。在单核细胞粘附试验中,U937对用7-酮胆固醇治疗的HAEC的粘附力增强,但是单克隆抗ICAM-1和VCAM-1抗体降低了内皮粘附力。总而言之,这项研究表明,内皮细胞对单核细胞的粘附性由于7-酮胆固醇的增加而与由ROS产生介导的ICAM-1和VCAM-1的表达增强有关。

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