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首页> 外文期刊>Infection and immunity >Protective effect of poly-2-vinylpyridine-N-oxide on susceptibility of silica-treated mice to experimental histoplasmosis.
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Protective effect of poly-2-vinylpyridine-N-oxide on susceptibility of silica-treated mice to experimental histoplasmosis.

机译:聚-2-乙烯基吡啶-N-氧化物对二氧化硅处理的小鼠对实验性组织胞浆病的敏感性的保护作用。

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We have studied the ability of poly-2-vinylpyridine-N-oxide (PVNO), a lysosomal stabilizing agent, to abrogate the cytotoxic effects of silica on macrophages. Male C3H/HeN mice were pretreated with PVNO and inoculated intravenously with silica particles. At 24 h after silica injection, silica-treated and -untreated mice were challenged intravenously with varying doses of live yeast cells of Histoplasma capsulatum. All mice receiving silica died when challenged with 5 X 10(5) yeast cells of Histoplasma sp. compared with no deaths in PVNO-pretreated animals and 10% mortality in controls not receiving PVNO or silica. When animals were given 2.5 X 10(5) yeast cells (a sublethal dose), the protective effect of PVNO was seen by a reduction in splenomegaly and viable Histoplasma sp. present in the spleen. Furthermore, PVNO alone showed a significant protective effect (P less than 0.05) against a lethal challenge with Histoplasma sp. Prior treatment with PVNO also protected mouse peritoneal macrophages from the cytotoxic effects of silica particles in vitro. These results indicate that PVNO abrogates the cytotoxicity of silica particles on macrophages and also increases the resistance of mice to histoplasmosis.
机译:我们研究了溶酶体稳定剂聚-2-乙烯基吡啶-N-氧化物(PVNO)消除二氧化硅对巨噬细胞的细胞毒性作用的能力。用PVNO预处理雄性C3H / HeN小鼠,并用二氧化硅颗粒静脉内接种。二氧化硅注射后24小时,用不同剂量的荚膜组织胞浆菌活酵母细胞静脉内攻击经二氧化硅处理和未处理的小鼠。当接受5 X 10(5)Histoplasma sp。酵母细胞攻击时,所有接受二氧化硅的小鼠都死亡。相比之下,经PVNO预处理的动物无死亡,而未接受PVNO或二氧化硅的对照组则有10%的死亡率。当给动物提供2.5 X 10(5)酵母细胞(亚致死剂量)时,可以通过减少脾肿大和有活力的组织胞浆菌看到PVNO的保护作用。目前在脾脏中。此外,单独的PVNO表现出显着的保护作用(P小于0.05),以抵抗组织胞浆菌的致死性攻击。预先用PVNO处理还可以保护小鼠腹膜巨噬细胞免受体外二氧化硅颗粒的细胞毒作用。这些结果表明,PVNO消除了二氧化硅颗粒对巨噬细胞的细胞毒性,并且还增加了小鼠对组织胞浆菌病的抵抗力。

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