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Function of SLAM-Associated Protein (SAP) in Acute Pneumoseptic Bacterial Infection

机译:血液相关蛋白质(SAP)在急性肺细菌感染中的功能

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Sepsis resulting from acute pneumonic infections by Gram-negative bacteria is often characterized by dysfunction of innate immune components. Here we report a previously unrecognized innate protective function of SAP, an adaptor protein primarily reported in T cells, NK cells, and NKT cells, during acute pneumonic infection with Klebsiella pneumoniae (KPn). SAP-deficient mice were highly susceptible to this infection with elevated systemic bacterial spread and increased lung damage. While the overall influx of infiltrating cells in the lungs remained largely intact, increased mortality of SAP-deficient mice correlated with increased accumulation of large NK1.1 + cells harboring bacteria and an impairment of neutrophil extracellular trap formation in vivo during KPn pneumonia, which likely facilitated bacterial outgrowth. Neutrophils were found to express SAP; however, adoptive transfer experiment supported a neutrophil-extrinsic function of SAP in neutrophil extracellular trap formation. Collectively, these data present the first report depicting innate protective function of SAP in an acute pulmonary infection. (C) 2019 Published by Elsevier Ltd.
机译:由革兰氏阴性细菌的急性肺炎感染引起的败血症常常具有先天免疫组分的功能障碍。在这里,我们报告了SAP的先前未识别的先天保护功能,该蛋白质主要在T细胞,NK细胞和NKT细胞中报道,在急性肺炎肺炎(KPN)中。 SAP缺陷的小鼠对这种感染具有高敏感性,具有升高的全身细菌扩散和肺部损伤。虽然肺中浸润细胞的总体流入仍然很完整,但SAP缺陷小鼠的死亡率增加,与患有细菌的大NK1.1 +细胞的积累增加相关,并且在KPN肺炎期间在体内患有中性粒细胞细胞外陷阱形成的损伤,这可能是促进的细菌遗传。发现中性粒细胞表达SAP;然而,采用转移实验支持中性粒细胞细胞外阱形成中的SAP中性粒细胞外函数。总的来说,这些数据显示了描述SAP在急性肺部感染中的先天保护功能。 (c)2019年由elestvier有限公司发布

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