Characterization of antioxidant activities of pulmonary surfactant mixtures.

Characterization of antioxidant activities of pulmonary surfactant mixtures.
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肺表面活性剂混合物抗氧化活性的表征。

DOI:
10.1016/0304-4165(90)90105-6
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发表时间:
1990
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Freeman,BA
Freeman,BA
中科院分区:
--
文献类型:
--
作者:
Matalon,S;Holm,BA;Baker,RR;Whitfield,MK;Freeman,BA

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已知气管内注入表面活性剂可以限制氧化性肺损伤患者和动物的发病率和死亡率。本研究对90%脂肪和10%蛋白质组成的天然肺表面活性剂(NLS)和99%脂肪和1%蛋白质组成的小牛肺表面活性剂提取物(CLSE)的抗氧化性能进行了定量分析。NLS的超氧化物歧化酶(SOD)和过氧化氢酶活性(7 U SOD/ μmol磷脂(PL)和1 U过氧化氢酶/μmol PL)显著高于CLSE。超过90%的SOD活性被1 mM KCN消除,表明这是酶的CuZn形式。此外,NLS显著降低了胞外h2o2,而不失去在动态压缩时达到低于1 dyn/cm的最小表面张力的能力。白蛋白不能解释NLS对h2o2的清除作用。用天然聚丙烯酰胺凝胶电泳分离的蛋白活性染色证实了NLS中过氧化氢酶和SOD活性的存在。经气管内注入7 ml (308 μmol PL)的NLS可显著提高离体12 h后ⅱ型细胞SOD含量。综上所述,除了促进肺泡的稳定性外,肺表面活性剂还可以通过清除细胞外产生的部分还原氧和提高细胞内抗氧化酶含量来对肺泡上皮提供显著的保护。
Instillation of intratracheal surfactant is known to limit the morbidity and mortality of patients and animals with oxidant-induced lung injury. In this study we quantified the antioxidant properties of natural lung surfactant (NLS), consisting of 90% lipid and 10% protein, and of calf lung surfactant extract (CLSE) consisting of 99% lipid and 1% protein. NLS, but not CLSE, contained significant amounts of superoxide dismutase (SOD) and catalase activities (7 U SOD/ μmol phospholipid (PL) and 1 U catalase/μmol PL). More than 90% of the SOD activity was abolished by 1 mM KCN, suggesting that this was the CuZn form of the enzyme. In addition, NLS significantly reduced extracellular H2O2without losing its ability to reach minimum surface tensions below 1 dyn/cm upon dynamic compression. The NLS scavenging of H2O2could not be accounted for by albumin. The presence of catalase and SOD activities in NLS was also verified by activity stains of proteins separated by native polyacrylamide gel electrophoresis. Intratracheal installation of 7 ml of NLS (308 μmol PL) into rabbits significantly increased SOD content in type II cells isolated 12 h later. It is concluded that, in addition to promoting alveolar stability, installation of pulmonary surfactant may offer significant protection to the alveolar epithelium by scavenging extracellularly generated partially reduced oxygen species and by enhancing intracellular antioxidant enzyme content.
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DOI: --
发表时间: 2006
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期刊: Journal of applied physiology (Bethesda, Md. : 1985)
影响因子: --
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