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Redox thiol status plays a central role in the mobilization and metabolism of nitric oxide in human red blood cells.

机译:氧化还原硫醇状态在人红细胞中一氧化氮的动员和代谢中起着核心作用。

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We assessed the redox thiol status influence on nitric oxide (NO) metabolism and efflux in erythrocytes stimulated with acetylcholinesterase substrate (acetylcholine, ACh) and inhibitor (velnacrine maleate, VM). Erythrocyte suspensions from healthy donors were incubated with increasing concentrations of dithiothreitol (1-50microM), in the presence and absence of acetylcholine/velnacrine (10microM). Levels of NO, nitriteitrate, S-nitrosohemoglobin, peroxynitrite and S-nitrosoglutathione were determined by spectrofluorimetric and spectrophotometric methods. Dithiothreitol significantly mobilized NO toward nitriteitrate and S-nitrosoglutathione, and decreased the amount of NO efflux. Both ACh/VM induce changes on the levels of erythrocyte nitriteitrate dependent on the DTT concentration. Higher levels of peroxynitrite and S-nitrosoglutathione were seen with velnacrine in presence of DTT 1 and 50microM. We concluded that dithiothreitol-induced activation of erythrocyte thiol status decreases NO efflux and allows greater intracellular NO mobilization onto different derivative molecules, both in the absence and presence of acetylcholinesterase substrate and inhibitor.
机译:我们评估了氧化还原硫醇状态对乙酰胆碱酯酶底物(乙酰胆碱,ACh)和抑制剂(马来酸韦尔纳辛)刺激的红细胞中一氧化氮(NO)代谢和外排的影响。在存在和不存在乙酰胆碱/凡纳林(10microM)的情况下,将来自健康供体的红细胞悬液与浓度递增的二硫苏糖醇(1-50microM)孵育。用分光荧光法和分光光度法测定NO,亚硝酸盐/硝酸盐,S-亚硝基血红蛋白,过氧亚硝酸盐和S-亚硝基谷胱甘肽的含量。二硫苏糖醇可显着动员NO迁移至亚硝酸盐/硝酸盐和S-亚硝基谷胱甘肽,并减少NO流出量。两种ACh / VM都会根据DTT浓度诱导亚硝酸红细胞/硝酸盐水平的变化。在存在DTT 1和50microM的情况下,使用韦尼可林观察到较高水平的过氧亚硝酸盐和S-亚硝基谷胱甘肽。我们得出的结论是,在不存在和存在乙酰胆碱酯酶底物和抑制剂的情况下,二硫苏糖醇诱导的红细胞硫醇状态的激活会降低NO流出并允许更大的细胞内NO动员到不同的衍生物分子上。

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