A small secreted protein triggers a TLR2/4-dependent inflammatory response during invasive Candida albicans infection

A small secreted protein triggers a TLR2/4-dependent inflammatory response during invasive Candida albicans infection
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一种小分泌蛋白在侵袭性白色念珠菌感染过程中触发 TLR2/4 依赖性炎症反应

DOI:
10.1038/s41467-019-08950-3
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发表时间:
2019-03
影响因子:
16.6
通讯作者:
Hui Xiao
Hui Xiao
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hui Xiao

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白色念珠菌可从寄生性转变为致病性,引起粘膜或播散性念珠菌病。宿主依赖模式识别受体,包括Toll样受体(TLR)和C型凝集素受体(CLR)来感知入侵的真菌病原体并启动免疫防御机制。然而,真菌和宿主先天免疫之间复杂的相互作用仍然不完全清楚。在这里,我们报告说,C。白念珠菌在遇到有限的氮和丰富的血清时上调分泌的富含半胱氨酸的小蛋白Sel 1的表达。Sel 1激活NF-κB和MAPK信号通路,导致促炎细胞因子和趋化因子的表达。全面的遗传和生化分析表明,TLR 2和TLR 4都是识别Sel 1所必需的。此外,SEL 1缺陷型C.白色念珠菌在体内表现出受损的免疫应答,导致血流感染模型中发病率和死亡率增加。我们确定了念珠菌-宿主相互作用的一个关键组成部分,为解决念珠菌感染和炎症开辟了一条新途径。
Candida albicans can switch from commensal to pathogenic mode, causing mucosal or disseminated candidiasis. The host relies on pattern-recognition receptors including Toll-like receptors (TLRs) and C-type lectin receptors (CLRs) to sense invading fungal pathogens and launch immune defense mechanisms. However, the complex interplay between fungus and host innate immunity remains incompletely understood. Here we report that C. albicans upregulates expression of a small secreted cysteine-rich protein Sel1 upon encountering limited nitrogen and abundant serum. Sel1 activates NF-κB and MAPK signaling pathways, leading to expression of proinflammatory cytokines and chemokines. Comprehensive genetic and biochemical analyses reveal both TLR2 and TLR4 are required for the recognition of Sel1. Further, SEL1-deficient C. albicans display an impaired immune response in vivo, causing increased morbidity and mortality in a bloodstream infection model. We identify a critical component in the Candida-host interaction that opens a new avenue to tackle Candida infection and inflammation.
DOI: 10.1093/jac/dki089
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