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Production of nitric oxide by human salivary peroxidase and by bovine lactoperoxidase

机译:人唾液过氧化物酶和牛乳过氧化物酶生产一氧化氮

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Peroxidases catalyze the oxidation of nitrite to nitrate in the presence of hydrogen peroxide. Two pathways may occur: one entailing the intermediate formation of NO 2 and the other implying the generation of peroxynitrite. The products of nitrite (NO 2 -) oxidation by salivary peroxidase (SPO) and commercial bovine lactoperoxidase (LPO) are studied by utilizing an electrochemical assay that allows the direct, continuous monitoring of NO and/or NO 2 and by HPLC to assess nitrates at the end of the reaction. Dialyzed saliva and LPO, in the presence of H 2O 2, convert nitrite into nitrate and form some NO, with a molar ratio of 10 3. In our experimental conditions, no NO 2 was detectable among the products of nitrite oxidation. SCN - inhibits NO formation and so does I -, although at higher concentrations. No effects are observed with Cl - or Br -. We conclude that SPO and LPO transform NO 2 - into nitrate-forming small amounts of NO in the presence of H 2O 2 as an intermediate or a by-product, synthesized through the peroxynitrite pathway.
机译:在过氧化氢的存在下,过氧化物酶催化亚硝酸盐氧化为硝酸盐。可能发生两种途径:一种途径中间形成NO 2,另一种途径暗示过氧亚硝酸盐的产生。唾液过氧化物酶(SPO)和商业牛乳过氧化物酶(LPO)氧化亚硝酸盐(NO 2-)的产物,通过利用电化学分析方法进行研究,该方法可以直接,连续地监测NO和/或NO 2并通过HPLC评估硝酸盐在反应结束时。透析的唾液和LPO在H 2O 2存在下将亚硝酸盐转化为硝酸盐并形成一些NO,摩尔比为103。在我们的实验条件下,亚硝酸盐氧化产物中未检测到NO 2。 SCN-抑制NO的形成,I-抑制I的形成,尽管浓度较高。 Cl-或Br-均未观察到作用。我们得出的结论是,在过氧亚硝酸盐途径合成的H 2O 2作为中间产物或副产物的存在下,SPO和LPO将NO 2-转化为形成硝酸盐的少量NO。

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