Interleukin-17 is a negative regulator of established allergic asthma.

Interleukin-17 is a negative regulator of established allergic asthma.
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DOI:
10.1084/jem.20061401
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发表时间:
2006-11-27
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Schnyder B
Schnyder B
中科院分区:
其他
文献类型:
--
作者:
Schnyder-Candrian S;Togbe D;Couillin I;Mercier I;Brombacher F;Quesniaux V;Fossiez F;Ryffel B;Schnyder B

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产生白细胞介素(IL)-17的辅助性T(Th)17细胞在自身免疫和过敏性炎症中起作用。在这里,我们表明,IL-23诱导IL-17在肺和IL-17是必需的抗原致敏过程中发展过敏性哮喘,如在IL-17 R缺陷小鼠。由于IL-17表达在抗原攻击后进一步增加,我们解决了其在效应期的功能。最引人注目的是,IL-17的中和增强了致敏小鼠的过敏反应。相反,外源性IL-17减少肺嗜酸性粒细胞募集和支气管高反应性,表明IL-17的新的调节作用。从机制上讲,IL-17下调嗜酸性粒细胞趋化因子嗜酸性粒细胞趋化因子(CCL 11)和胸腺和激活调节趋化因子/CCL 17(TARC)在体内和体外抗原再刺激后的肺。在体外,IL-17减少树突状细胞(DC)中TARC的产生-TARC的主要来源-和DC的抗原摄取以及局部淋巴结中IL-5和IL-13的产生。此外,IL-17以IL-4依赖性方式调节,因为IL-4 R α信号传导缺陷的小鼠显示IL-17浓度显著增加,嗜酸性粒细胞募集受到抑制。因此,内源性IL-17受IL-4控制,具有双重作用。虽然在抗原致敏过程中建立过敏性哮喘是必不可少的,但在致敏小鼠中,IL-17通过抑制DC和趋化因子的合成来减弱过敏反应。
T helper (Th)17 cells producing interleukin (IL)-17 play a role in autoimmune and allergic inflammation. Here, we show that IL-23 induces IL-17 in the lung and IL-17 is required during antigen sensitization to develop allergic asthma, as shown in IL-17R–deficient mice. Since IL-17 expression increased further upon antigen challenge, we addressed its function in the effector phase. Most strikingly, neutralization of IL-17 augmented the allergic response in sensitized mice. Conversely, exogenous IL-17 reduced pulmonary eosinophil recruitment and bronchial hyperreactivity, demonstrating a novel regulatory role of IL-17. Mechanistically, IL-17 down modulated eosinophil-chemokine eotaxin (CCL11) and thymus- and activation-regulated chemokine/CCL17 (TARC) in lungs in vivo and ex vivo upon antigen restimulation. In vitro, IL-17 reduced TARC production in dendritic cells (DCs)—the major source of TARC—and antigen uptake by DCs and IL-5 and IL-13 production in regional lymph nodes. Furthermore, IL-17 is regulated in an IL-4–dependent manner since mice deficient for IL-4Rα signaling showed a marked increase in IL-17 concentration with inhibited eosinophil recruitment. Therefore, endogenous IL-17 is controlled by IL-4 and has a dual role. Although it is essential during antigen sensitization to establish allergic asthma, in sensitized mice IL-17 attenuates the allergic response by inhibiting DCs and chemokine synthesis.
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