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STAT3 缺陷改变了巨细胞激活模式,并增强了 Staphylococcal 肺炎期间的矩阵金属蛋白酶9表达

Susan Farmand^1,2, Vicky Sender^1,3, Jens Karlsson^1,3

¹Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.

Journal of immunology (Baltimore, Md. : 1950)

|November 20, 2023

概括

骨髓细胞中的STAT3缺乏会加剧Staphylococcus aureus肺炎期间的炎症,但不会影响病原体的清除. 这种高度的炎症反应涉及矩阵金属蛋白酶9和miR-155,可能会导致敏感患者的肺组织损伤.

科学领域:

免疫学免疫学免疫学
细胞生物学细胞生物学
肺部医学肺部医学

背景情况:

黄金葡萄球菌会导致严重的肺部感染,特别是在STAT3缺乏的人群中.
巨细胞在细菌性肺炎期间的宿主防御和炎症中发挥着关键作用.

研究的目的:

为了研究骨髓体STAT3在巨细胞对黄金色杆菌感染的反应中的作用.
为了确定小鼠骨髓细胞STAT3缺乏对葡萄球菌肺炎炎炎症和病原体清除的影响.

主要方法:

从STAT3淘汰和野生类型小鼠中获得的小鼠骨髓衍生巨细胞 (BMDM) 用S. aureus刺激.
在体外分析促炎和抗炎反应,极化和激活标记物.
在小鼠体内黄金菌感染,随后对支气管支气管洗和肺组织进行分析.

主要成果:

在S. aureus的挑战下,STAT3缺乏的BMDM表现出增加的促炎性细胞因子释放和增强的MHCII类和CD86的升调.
鼠骨髓细胞STAT3缺乏症在体外或体内没有影响S. aureus清除.
在S. aureus感染期间,STAT3缺乏的巨细胞和肺组织中,矩阵金属蛋白酶9和miR-155的表达被上调.

结论:

在S. aureus感染期间,小鼠骨髓体STAT3缺乏导致增强的炎症反应和矩阵金属蛋白酶9和miR-155的上调.
这些发现表明,在患有葡萄球菌肺炎的STAT3缺乏症患者中观察到的肺组织损伤的潜在机制.

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