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Comparing the role of silica particle size with mineral fiber geometry in the release of superoxide from rat alveolar macrophages

机译:比较二氧化硅粒径和矿物纤维几何形状在大鼠肺泡巨噬细胞释放超氧化物中的作用

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摘要

Particulate air pollutants and mineral fibers activate inflammatory cells to release oxidants, which contribute to inflammation and injury in the lower respiratory tract. Our aim was to compare the role of silica particle size with mineral fiber length and width in the ability to induce superoxide release from rat alveolar macrophages. We estimated the ability of four types of silica particle samples, with different mode diameter, and three types of mineral fiber samples, with different geometric mean lengths and widths, to induce lucigenin-dependent chemiluminescence (CL) from the cells per number of dust particles (i.e., silica particles and mineral fibers). A close positive correlation was observed between dust size and the ability to induce CL in silica as well as mineral fiber samples. Moreover, the ability of silica samples to induce CL was weaker than that of long mineral fiber sample. This ability increased at a larger rate in small silica particle and thin mineral fiber samples than in large silica particle and thick mineral fiber samples at the initial stage of administration. These results suggest that the kinetics of the induction superoxide release from macrophages is similar between silica particles and mineral fibers; moreover, this depends on silica particle size and mineral fiber geometry. Finally, large silica particles were more active than small ones.
机译:颗粒状的空气污染物和矿物质纤维激活炎症细胞释放出氧化剂,从而导致下呼吸道的炎症和损伤。我们的目的是比较二氧化硅粒径与矿物纤维长度和宽度在诱导大鼠肺泡巨噬细胞释放超氧化物的能力中的作用。我们估算了四种具有不同众数直径的二氧化硅颗粒样品和三种具有不同几何平均长度和宽度的矿物纤维样品从细胞中每单位尘埃颗粒中诱导产生光泽黄素依赖性化学发光(CL)的能力(即二氧化硅颗粒和矿物纤维)。在二氧化硅和矿物纤维样品中,粉尘大小与诱导CL的能力之间存在密切的正相关。此外,二氧化硅样品诱导CL的能力比长矿物纤维样品弱。在给药初期,小二氧化硅颗粒和细矿物纤维样品中的这种能力以比大二氧化硅颗粒和粗矿物纤维样品中更大的速率增加。这些结果表明,巨噬细胞释放诱导超氧化物的动力学在二氧化硅颗粒和矿物纤维之间是相似的。此外,这取决于二氧化硅的粒度和矿物纤维的几何形状。最终,大的二氧化硅粒子比小粒子更有活性。

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