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Oxidative stress on plasmid DNA induced by inhalable particles in the urban atmosphere

机译:可吸入颗粒物在城市大气中对质粒DNA的氧化应激

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摘要

Plasmid DNA assay is a newly-developed in vitro method to investigate bioreactivity of particles. In this paper, this method was used to study the bioreactivity of PM_(10) (particulate matter with aerodynamic diameter of less than 10 mu m) and PM_(2.5) (particulate matter with aerodynamic diameter of less than 2.5 mu m). Samples and dust storm particles were collected in 2001 in an urban area, a satellite city and a clean air area in Beijing. A big difference was found for oxidative DNA stress induced by different particulate matter (PM) samples, with the TM50 (particle mass causing 50 percent damage to DNA) values varying by a factor over 10. This was closely dependent on the sizes of particles as well as the variation in relative proportion of mineral matter. PM_(2.5) samples generally impose larger oxidative stress on plasmid DNA than PM_(10) samples. Airborne particles collected during dust storm episodes, usually with a higher proportion of mineral matter, have a much lower oxidative capacity than those collected during non-dust storm episodes. PM samples and their water-soluble fractions usually have similar bioreactivities, demonstrating that oxidative capacity of Beijing airborne particles is mainly sourced from their water-soluble fractions.
机译:质粒DNA分析是一种新近开发的体外方法,用于研究颗粒的生物反应性。在本文中,该方法用于研究PM_(10)(空气动力学直径小于10微米的颗粒物)和PM_(2.5)(空气动力学直径小于2.5微米的颗粒物)的生物反应性。 2001年,在北京的一个市区,一个卫星城市和一个空气清新的地区收集了样本和沙尘暴颗粒。发现由不同颗粒物质(PM)样品引起的氧化DNA应力有很大差异,TM50(颗粒质量对DNA造成50%的破坏)值的变化超过10倍。这与颗粒大小密切相关,因为以及矿物质相对比例的变化。与PM_(10)样品相比,PM_(2.5)样品通常在质粒DNA上施加更大的氧化应激。在沙尘暴期间收集的空气中的颗粒物通常具有较高的矿物质含量,其氧化能力要比非沙尘暴期间收集的低得多。 PM样品及其水溶性级分通常具有相似的生物反应性,表明北京机载颗粒的氧化能力主要来自其水溶性级分。

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