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首页> 外文期刊>Journal of pharmaceutical sciences. >Quantitative analysis of cysteine-34 on the anitioxidative properties of human serum albumin in hemodialysis patients.
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Quantitative analysis of cysteine-34 on the anitioxidative properties of human serum albumin in hemodialysis patients.

机译:血液透析患者中​​半胱氨酸34对人血清白蛋白抗氧化特性的定量分析。

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摘要

The purpose of this study was to quantitatively evaluate the extent of contribution of cysteine-34 ((34) Cys) on the antioxidant effect of human serum albumin (HSA) and to elucidate the physiological implication in hemodialysis (HD) patients. The ratio of oxidized albumin correlated directly with the thiol content in plasma of the HD patients who received intravenous iron. Moreover, the degree of oxidation of (34) Cys in HSA purified from the HD patients' plasma correlated with the thiol content in plasma. The radical scavenging activity of purified HSA was dependent on the degree of (34) Cys oxidation. A recombinant mutant, C34S, was produced to confirm the role of (34) Cys. The activity of C34S was about half of that of wild-type HSA (WT-HSA). Consistent with this observation, the protective effects of C34S were significantly lower than those of WT-HSA in suppressing cytotoxicity and vascular endothelial growth factor production induced by fenton reaction in a human vascular endothelial cell model. These results indicate that the (34) Cys residue of HSA may account for more than 40% of the antioxidant effect of HSA in vivo, and thus may exert a protective effect on vascular endothelium function via an antioxidative mechanism in chronic renal disease.
机译:本研究的目的是定量评估半胱氨酸34((34)Cys)对人血清白蛋白(HSA)的抗氧化作用的作用程度,并阐明血液透析(HD)患者的生理学意义。接受静脉铁剂治疗的HD患者血浆中氧化白蛋白的比例与血浆中的硫醇含量直接相关。此外,从HD患者血浆中纯化的HSA中(34)Cys的氧化程度与血浆中的硫醇含量相关。纯化的HSA的自由基清除活性取决于(34)Cys氧化程度。产生了重组突变体C34S,以确认(34)Cys的作用。 C34S的活性约为野生型HSA(WT-HSA)的一半。与该观察结果一致,在人血管内皮细胞模型中,C34S在抑制由芬顿反应引起的细胞毒性和血管内皮生长因子产生方面的保护作用明显低于WT-HSA。这些结果表明,HSA的(34)Cys残基可能占体内HSA的抗氧化作用的40%以上,因此可以通过抗氧化机制在慢性肾脏疾病中对血管内皮功能发挥保护作用。

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