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Potential genotoxicity of chronically elevated nitric oxide: A review

机译:慢性一氧化氮的潜在遗传毒性:综述

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Several human cancers are associated with chronic bacterial, viral and parasitic infections. Nitric oxide, which is a short-lived free radical produced by marty types of cells for a number of important physiological functions, is elevated in these infections. Long-term exposure to elevated NO centre dot in cells could have potential genotoxic effects on hosts. There are at least three mechanisms by which intracellular elevated NO centre dot could exert genotoxic affects after reacting with O_2. Theseinclude formation of carcinogenic N-mtrosc- compounds, direct deamination of DNA bases, and oxidation of DNA after formation of peroxynilrite and/or hydroxyl radicals. One or more of these mechanisms. could, theoretically, explain why chronic infectionincreases the risk of certain cancers.
机译:几种人类癌症与慢性细菌,病毒和寄生虫感染有关。一氧化氮是由mar夫类型的细胞产生的,具有许多重要生理功能的短寿命自由基,在这些感染中会升高。长期暴露于细胞中升高的NO中心点可能会对宿主产生潜在的遗传毒性作用。与O_2反应后,细胞内升高的NO中心点至少可以通过三种机制发挥遗传毒性作用。这些包括致癌的N-间苯二酚化合物的形成,DNA碱基的直接脱氨基和过氧腈和/或羟基自由基形成后DNA的氧化。这些机制中的一种或多种。从理论上讲,可以解释为什么慢性感染会增加某些癌症的风险。

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