The Role of Staphylococcus aureus SasD in Lung

总结 尽管有强烈的研究重点，金黄色葡萄球菌仍然是两个社区的重要原因 获得性肺炎和病毒相关的双重感染。该领域最近确定了宿主介导的 S.金黄色葡萄球菌导致肺部感染和损伤。在先前流感的背景下 感染，我们的小组和许多其他人已经描述了异常的免疫途径调节作为S. 金黄色葡萄球菌的易感性和发病机制。除了宿主介导的相互作用外，S. aureus表达了一个数字 分泌的和细胞壁的毒力因子在肺部感染中还没有得到充分的表征。我们 进行了转座子突变体筛选。金黄色葡萄球菌细胞壁锚定蛋白在肺部感染和超 感染小鼠。屏幕上出现了一个新的S。金黄色葡萄球菌毒力因子，SasD，这是肺 炎症、损伤和死亡率。SasD也是肺上皮细胞粘附和炎症反应所必需的。 巨噬细胞的细胞因子诱导。在本申请中，我们假设S.金黄色葡萄球菌SasD是一种关键毒力 肺感染因子，介导细菌粘附于肺基质并与 初级肺吞噬细胞。我们将用两个独立但相关的目标来检验这一假设：1）调查 SasD在细菌粘附于肺上皮细胞和肺中体内生长中的作用，2）检查SasD的作用， SasD介导S.金黄色葡萄球菌与肺吞噬细胞的相互作用以及对肺部炎症的影响。我们 将决定S的上下文相关角色。金黄色葡萄球菌SasD单一感染和流感病毒重叠感染。此外，本发明还 我们将利用尖端工具来确定人类和小鼠系统中的这些相互作用。生成的数据 在这个项目中，将告知重点放在S。金黄色葡萄球菌SasD作为潜在的治疗或疫苗靶点， 肺部感染

SUMMARY Despite intense research focus, Staphylococcus aureus has remained an important cause of both community acquired pneumonia and viral-related super-infections. The field has recently determined host mediated mechanisms induced by S. aureus that drive lung infection and injury. In the context of preceding influenza infection, our group and many others have delineated aberrant immune pathway regulation as key drivers of S. aureus susceptibility and pathogenesis. In addition to host mediated interactions, S. aureus expresses a number of secreted and cell wall virulence factors that have not been fully characterized in pulmonary infection. We performed a transposon mutant screen of S. aureus cell wall anchored proteins in pulmonary infection and super- infection in mice. This screen revealed a novel S. aureus virulence factor, SasD, which is required for lung inflammation, injury, and mortality. SasD was also required for lung epithelial cell attachment and inflammatory cytokine induction by macrophages. In this application, we hypothesize that S. aureus SasD is a critical virulence factor in pulmonary infection, which mediates bacterial adherence to the lung stroma and interactions with primary lung phagocytes. We will test this hypothesis with two independent, but related Aims; 1) investigate the role of SasD in bacterial adhesion to lung epithelial cells and in vivo growth in the lung, 2) examine the role of SasD in mediating S. aureus interaction with pulmonary phagocytes and the impact on lung inflammation. We will determine the context dependent roles of S. aureus SasD in single and influenza super-infection. Further, we will utilize cutting edge tools to determine these interactions in human and mouse systems. Data generated in this project will inform upon focusing on S. aureus SasD at a potential therapeutic or vaccine target in pulmonary infections.