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Protein A is a virulence factor in Staphylococcus aureus arthritis and septic death

机译:蛋白A是金黄色葡萄球菌关节炎和败血病的致病因子

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Staphylococcal protein A (SpA), a cell wall anchored protein of Staphylococcus aureus, has the ability to interact with several host components, possibly indicating a role as a virulence factor in S. aureus infections. In this study, the contribution of SpA to bacterial virulence was investigated in a murine model of S. aureus arthritis. Intravenous inoculation of S. aureus wild-type strain Newman gave rise to more severe arthritis and higher mortality than the isogenic spa mutant strain DU5873. The wild-type strain caused more in vitro spleen cell proliferation than the SpA-deficient strain. However, IL-6 and TNF-alpha levels were higher after stimulation with the spa mutant strain compared to the wild-type strain. To conclude, our results clearly indicate that SpA is a virulence factor of S. aureus in murine septic arthritis.
机译:金黄色葡萄球菌的细胞壁锚定蛋白葡萄球菌蛋白A(SpA)具有与几种宿主成分相互作用的能力,这可能表明它是金黄色葡萄球菌感染中的一种毒力因子。在这项研究中,在金黄色葡萄球菌关节炎的小鼠模型中研究了SpA对细菌毒力的贡献。与同基因spa突变株DU5873相比,金黄色葡萄球菌野生型Newman菌株的静脉内接种引起更严重的关节炎和更高的死亡率。野生型菌株比SpA缺陷型菌株引起更多的体外脾细胞增殖。但是,与野生型菌株相比,用spa突变菌株刺激后,IL-6和TNF-α水平更高。总而言之,我们的结果清楚地表明,SpA是鼠源性化脓性关节炎中金黄色葡萄球菌的毒力因子。

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