Oxidative Stress Induces HSP90 Upregulation on the Surface of Primary Human Endothelial Cells: Role of the Antioxidant 7,8-Dihydroxy-4-methylcoumarin in Preventing HSP90 Exposure to the Immune System.

Oxidative Stress Induces HSP90 Upregulation on the Surface of Primary Human Endothelial Cells: Role of the Antioxidant 7,8-Dihydroxy-4-methylcoumarin in Preventing HSP90 Exposure to the Immune System.
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DOI:
10.1155/2018/2373167
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发表时间:
2018
影响因子:
--
通讯作者:
Riganò R
Riganò R
中科院分区:
生物学2区
文献类型:
--
作者:
Profumo E;Buttari B;Tinaburri L;D'Arcangelo D;Sorice M;Capozzi A;Garofalo T;Facchiano A;Businaro R;Kumar P;Singh BK;Parmar VS;Saso L;Riganò R

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我们以前已经证明,人热休克蛋白90(HSP 90),细胞内的自我蛋白,是在颈动脉粥样硬化患者的细胞和体液自身免疫反应的目标。在这项研究中,我们在体外评估氧化应激,动脉粥样硬化斑块的一个特征,是否改变了内皮细胞中的HSP 90表达,从而诱导该分子的表面定位,以及抗氧化剂化合物7,8-二羟基-4-甲基香豆素(7,8-DHMC)是否能够防止氧化应激诱导的HSP 90定位的改变。通过使用流式细胞术,免疫荧光,酶联免疫吸附试验,半定量逆转录聚合酶链反应,我们证明,暴露的人脐静脉内皮细胞(HUVEC)的促氧化剂化合物H2 O2上调HSP 90的表面表达和减少其分泌,而不改变HSP 90基因表达和胞浆内蛋白水平。用7,8-DHMC预处理HUVEC可抑制H_2O_2诱导的HSP 90细胞分布和分泌的改变。我们的研究结果表明,动脉粥样硬化斑块的强氧化条件下,促进内皮细胞上的HSP 90表面表达的上调,从而使蛋白质的自身免疫反应的一个可能的目标。抗氧化剂7,8-DHMC通过防止氧化应激触发的HSP 90表面上调,可用于抵消对HSP 90的可能的自身反应性反应。
We have previously demonstrated that human heat shock protein 90 (HSP90), an intracellular self protein, is the target of cellular and humoral autoimmune responses in patients with carotid atherosclerosis. In this study, we evaluated in vitro whether oxidative stress, a feature of atherosclerotic plaque, alters HSP90 expression in endothelial cells, thus inducing surface localization of this molecule and whether the antioxidant compound 7,8-dihydroxy-4-methylcoumarin (7,8-DHMC) is able to prevent oxidative stress-induced alterations of HSP90 localization. By the use of flow cytometry, immunofluorescence, enzyme-linked immunosorbent assay, and semiquantitative reverse-transcription polymerase chain reaction, we demonstrated that exposure of human umbilical vein endothelial cells (HUVEC) to the prooxidant compound H2O2 upregulated HSP90 surface expression and reduced its secretion without altering HSP90 gene expression and intracytoplasmic protein levels. Pretreatment of HUVEC with 7,8-DHMC prevented H2O2-induced alterations of HSP90 cellular distribution and secretion. Our results suggest that the strong oxidative conditions of atherosclerotic plaques promote the upregulation of HSP90 surface expression on endothelial cells, thus rendering the protein a possible target of autoimmune reactions. The antioxidant 7,8-DHMC, by preventing oxidative-stress-triggered HSP90 surface upregulation, may be useful to counteract possible autoreactive reactions to HSP90.
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