Blood:L-选择素脱落影响中性粒细胞清除肺部感染细胞

2020-01-12 QQY MedSci原创

中心点:L-选择素脱落可增强整合素的外-内信号转导,是K型肺炎链球菌所致肺炎细菌清除所必需的。IRhom2-依赖性ADAM17激活导致L-选择素脱落,继而增强中性粒细胞的效应功能。摘要:L-选择素的脱落影响肺部的细菌清除:一种整合素由外向内信号通路的新调控通路。革兰阴性菌引起的肺炎是一种常见而严重的疾病,发病率高,死亡率高。消除致病菌依赖于中性粒细胞的招募和功能。近期,黏附分子L-选择素在中性粒细

中心点:

L-选择素脱落可增强整合素的外-内信号转导,是K型肺炎链球菌所致肺炎细菌清除所必需的。

IRhom2-依赖性ADAM17激活导致L-选择素脱落,继而增强中性粒细胞的效应功能。

摘要:

L-选择素的脱落影响肺部的细菌清除:一种整合素由外向内信号通路的新调控通路。

革兰阴性菌引起的肺炎是一种常见而严重的疾病,发病率高,死亡率高。消除致病菌依赖于中性粒细胞的招募和功能。近期,黏附分子L-选择素在中性粒细胞整合素活化中的作用被发现(内外转导信号)。但L-选择素参与宿主免疫抵抗Klebsiella肺炎链球菌诱导的肺炎的分子机制尚不明确。

研究人员发现,与野生型小鼠相比,L-选择素缺陷的小鼠更容易发生肺炎。在机制上,被整合素参与触发的L-选择素从中性粒细胞表面分裂,参与中性粒细胞募集进入肺和细菌清除。整合素连接的下游,金属蛋白酶A分解素和金属蛋白酶17 (ADAM17)以IRhom2依赖的方式从中性粒细胞表面释放L-选择素。L-选择素的清除可增强整合素介导的外-内信号转导,进而增强中性粒细胞的效应功能。

因此,本研究揭示了一种新的调节机制:在K型肺炎链球菌诱导的肺炎中,中性粒细胞需要整合素参与触发L-选择素脱落以获得足够的免疫反应。

原始出处:

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Blood:L-选择素脱落对肺内细菌清除-整合素-外-内信号通路的调控

革兰氏阴性菌引起的肺炎是一种常见的严重疾病,具有较高的发病率和死亡率。清除致病菌依赖于中性粒细胞的募集和功能。近期,研究发现黏附分子L-选择素参与中性粒细胞整合素活化(由内而外型信号传导)。但L-选择素参与宿主防御肺炎克雷伯菌引起的肺部炎症的分子机制尚不明确。