哺乳動物的消化道、皮膚等粘膜器官作為機體的第一道免疫防線,,在宿主的抗感染天然免疫反應中發(fā)揮至關重要的作用,。當機體遭遇外來病源微生物入侵時,機體的粘膜天然免疫系統(tǒng)是如何快速響應并放大效應的,,一直以來還不是很清楚,。
10月12日,Nature Immunology在線發(fā)表了中科院上海生命科學研究院/上海交大醫(yī)學院健康所錢友存研究組關于白介素17家族新成員白介素17C(IL-17C)及其受體白介素17受體E(IL-17RE)在抗腸道病菌感染過程中的作用研究論文IL-17RE is the functional receptor for IL-17C and mediates mucosal immunity to infection with intestinal pathogens,。
白介素-17家族含有6個細胞因子IL-17A—IL-17F,,而白介素-17受體家族含有5個成員IL-17RA—IL-17RE。IL-17RE的配體及其功能仍然未知,。該研究首次發(fā)現(xiàn)了“孤兒”受體IL-17RE的配體IL-17C,。在腸道病菌感染的情況下,腸道上皮細胞會特異性地分泌IL-17C,而IL-17C會以自分泌的方式作用于腸道上皮細胞上的IL-17RE/IL-17RA受體復合體,,進而向下游傳導信號,,激活炎癥因子和抗菌肽,從而抵抗病菌的入侵,。IL-17RE基因敲除小鼠在腸道病菌侵染的情況下喪失正常小鼠的抵抗能力,,進而發(fā)生死亡。更有趣的是,,IL-17C還和IL-22(另一個重要的抗感染細胞因子)一起作用于腸道上皮細胞,,協(xié)同誘導抗菌肽的產(chǎn)生,進一步擴大了抵抗病菌感染的效應,。
該研究闡明了IL-17C及其受體IL-17RE在宿主粘膜免疫過程中功能與作用機制,,為感染性疾病的預防與治療提供了重要的理論基礎。
該工作主要由博士生宋昕陽在錢友存研究員的指導下完成,。該課題獲得國家自然科學基金委、國家科技部,、中國科學院和上海市科委的經(jīng)費資助,。(生物谷 Bioon.com)
doi:10.1038/ni.2155
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IL-17RE is the functional receptor for IL-17C and mediates mucosal immunity to infection with intestinal pathogens
Xinyang Song,Shu Zhu, Peiqing Shi, Yan Liu, Yufang Shi, Steven D Levin & Youcun Qian1
Interleukin 17 receptor E (IL-17RE) is an orphan receptor of the IL-17 receptor family. Here we show that IL-17RE is a receptor specific to IL-17C and has an essential role in host mucosal defense against infection. IL-17C activated downstream signaling through IL-17RE–IL-17RA complex for the induction of genes encoding antibacterial peptides as well as proinflammatory molecules. IL-17C was upregulated in colon epithelial cells during infection with Citrobacter rodentium and acted in synergy with IL-22 to induce the expression of antibacterial peptides in colon epithelial cells. Loss of IL-17C-mediated signaling in IL-17RE-deficient mice led to lower expression of genes encoding antibacterial molecules, greater bacterial burden and early mortality during infection. Together our data identify IL-17RE as a receptor of IL-17C that regulates early innate immunity to intestinal pathogens.