IL-1β activation in response to Staphylococcus aureus lung infection requires inflammasome-dependent and independent mechanisms.

IL-1β activation in response to Staphylococcus aureus lung infection requires inflammasome-dependent and independent mechanisms.
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响应金黄色葡萄球菌肺部感染的IL-1β活化需要炎症体依赖和独立的机制。

DOI:
10.1002/eji.201847556
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发表时间:
2018-10
影响因子:
5.4
通讯作者:
Parker D
Parker D
中科院分区:
医学3区
文献类型:
--
作者:
Pires S;Parker D

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维持理想且平衡的 IL-1β 水平对于避免宿主组织损伤至关重要。鼻内感染金黄色葡萄球菌的 Ifnlr1−/− 小鼠可显着改善细菌清除率、存活率,并减少气道中促炎细胞因子(包括 IL-1β),感染后 4 小时和 24 小时分别减少 75% (P<0.0001) 和 97% (P<0.001)。用小鼠重组IL-1β治疗Ifnlr1−/−小鼠会导致气道和肺部的细菌负荷增加。与从 WT 小鼠中分离的中性粒细胞相比,从 Ifnlr1−/− 感染小鼠的肺部纯化的中性粒细胞的 IL-1β 水平降低了 50% (P<0.05)。缺乏 NLRP3 和 caspase-1 的小鼠在感染 4 小时后 IL-1β 水平降低,分别是由于活性 caspase-1 的减少或缺乏,24 小时的水平与 WT 感染的小鼠相当。 Ifnlr1−/− 感染小鼠的活性 caspase-1 和中性粒细胞弹性蛋白酶均减少,表明中性粒细胞丝氨酸蛋白酶在 IL-1β 加工中发挥重要作用。通过抑制中性粒细胞弹性蛋白酶,与 WT 小鼠相比,我们能够将 Nlrp3−/− 感染小鼠的 IL-1β 水平降低 39%。这些结果强调了两种蛋白酶通过炎症体依赖性和独立机制在 IL-1β 加工中的关键作用。
Maintaining ideal and balanced levels of IL-1β is of extreme importance as a way to avoid host tissue damage. Intranasal infection of Ifnlr1−/− mice with Staphylococcus aureus led to significantly improved bacterial clearance, survival and decrease of proinflammatory cytokines in the airway including IL-1β, which was decreased by 75% (P<0.0001) and 97% (P<0.001) at 4 and 24 h after infection, respectively. Treatment of Ifnlr1−/− mice with mouse recombinant IL-1β led to increased bacterial burden in the airway and lung. Neutrophils purified from lungs of Ifnlr1−/− infected mice displayed a 50% decrease (P<0.05) in IL-1β levels compared to neutrophils isolated from WT mice. Mice lacking NLRP3 and caspase-1 had reduced IL-1β levels 4 h after infection, due to reductions or absence of active caspase-1 respectively, levels at 24 h were comparable to WT infected mice. Ifnlr1−/− infected mice had decreases in both active caspase-1 and neutrophil elastase indicating an important role for the neutrophil serine protease in IL-1β processing. By inhibiting neutrophil elastase, we were able to decrease IL-1β levels by 39% in Nlrp3−/− infected mice when compared to WT mice. These results highlight the crucial role of both proteases in IL-1β processing, via inflammasome dependent and independent mechanisms.
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