IL-17 Receptor Signaling in the Lung Epithelium Is Required for Mucosal Chemokine Gradients and Pulmonary Host Defense against K. pneumoniae.

IL-17 Receptor Signaling in the Lung Epithelium Is Required for Mucosal Chemokine Gradients and Pulmonary Host Defense against K. pneumoniae.
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DOI:
10.1016/j.chom.2016.10.003
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发表时间:
2016-11-09
影响因子:
30.3
通讯作者:
Kolls JK
Kolls JK
中科院分区:
医学1区
文献类型:
--
作者:
Chen K;Eddens T;Trevejo-Nunez G;Way EE;Elsegeiny W;Ricks DM;Garg AV;Erb CJ;Bo M;Wang T;Chen W;Lee JS;Gaffen SL;Kolls JK

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细胞因子IL17及其异二聚体IL-17RA/IL-17RC受体的信号传导对宿主防御细胞外细菌和真菌病原体至关重要。极化肺上皮细胞在基底侧表达IL-17RA和IL-17RC。然而,它们在体内对il -17依赖性肺防御的贡献仍有待确定。为了解决这个问题,我们在表达scgb1a1的俱乐部细胞(小鼠细支气管上皮的主要成分)中产生了条件缺失Il17ra或Il17rc的小鼠。这些小鼠表现出il - 17对气道管腔招募中性粒细胞的能力受损,这是肺部病原体肺炎克雷伯菌对粘膜攻击时细菌清除的缺陷,并且大大降低了上皮趋化因子Cxcl5的表达。经鼻给药重组CXCL5可恢复中性粒细胞募集和细菌清除。我们的数据表明,肺上皮中的IL-17R信号在建立趋化因子梯度中起着关键作用,趋化因子梯度是粘膜免疫抵抗肺部细菌病原体所必需的。
The cytokine IL17, and signaling via its heterodimeric IL-17RA/IL-17RC receptor, is critical for host defense against extracellular bacterial and fungal pathogens. Polarized lung epithelial cells express IL-17RA and IL-17RC basolaterally. However, their contribution to IL-17-dependent pulmonary defenses in vivo remains to be determined. To address this, we generated mice with conditional deletion of Il17ra or Il17rc in Scgb1a1-expressing club cells, a major component of the murine bronchiolar epithelium. These mice displayed an impaired ability to recruit neutrophils into the airway lumen in response to IL17, a defect in bacterial clearance upon mucosal challenge with the pulmonary pathogen Klebsiella pneumoniae, and substantially reduced epithelial expression of the chemokine Cxcl5. Neutrophil recruitment and bacterial clearance were restored by intranasal administration of recombinant CXCL5. Our data show that IL-17R signaling in the lung epithelium plays a critical role in establishing chemokine gradients that are essential for mucosal immunity against pulmonary bacterial pathogens.
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