Caspase-8 modulates dectin-1 and complement receptor 3-driven IL-1β production in response to β-glucans and the fungal pathogen, Candida albicans.

Caspase-8 modulates dectin-1 and complement receptor 3-driven IL-1β production in response to β-glucans and the fungal pathogen, Candida albicans.
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caspase-8可调节dectin-1和补体受体3驱动的IL-1β产生,以响应于β-葡聚糖和真菌病原体念珠菌白色念珠菌。

DOI:
10.4049/jimmunol.1400276
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发表时间:
2014-09-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Fitzgerald KA
Fitzgerald KA
中科院分区:
其他
文献类型:
--
作者:
Ganesan S;Rathinam VAK;Bossaller L;Army K;Kaiser WJ;Mocarski ES;Dillon CP;Green DR;Mayadas TN;Levitz SM;Hise AG;Silverman N;Fitzgerald KA

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炎症小体是宿主防御多种微生物病原体的中心介质。 NLRP3 炎性体在触发 caspase-1 依赖性 IL-1β 成熟和抵抗白色念珠菌感染中的真菌传播方面发挥着关键作用。 β-葡聚糖是真菌细胞壁的主要成分,可触发小鼠和人类免疫细胞分泌 IL-1β。在这项研究中,我们试图确定 β-葡聚糖对白色念珠菌诱导的小鼠树突细胞炎症反应的贡献。我们表明,NLRP3-ASC-caspase-1 炎性体对于响应 β-葡聚糖产生 IL-1β 绝对至关重要。有趣的是,我们还发现补体受体 3 (CR3/Mac-1) 和 dectin-1 在协调 β-葡聚糖诱导的 IL-1β 加工以及细胞死亡反应中发挥着至关重要的作用。除了 caspase-1 的重要作用外,我们还确定了促凋亡蛋白酶 caspase-8 在促进 β-葡聚糖诱导的细胞死亡和 NLRP3 炎性体依赖性 IL-1β 成熟中的重要作用。还发现,针对热灭活的白色念珠菌,NLRP3 依赖性 IL-1β 的产生对补体受体 3 和 caspase-8 有强烈的需求。总之,这些结果定义了 dectin-1、CR3 和 caspase-8,以及典型的 NLRP3 炎症小体,在介导 β-葡聚糖和白色念珠菌诱导的树突状细胞先天反应中的重要性。总的来说,这些发现在 β-葡聚糖识别受体与炎症蛋白酶 caspase-8 和 caspase-1 之间建立了一种新的联系,在响应免疫刺激真菌成分时协调细胞因子分泌和细胞死亡。
Inflammasomes are central mediators of host defense to a wide range of microbial pathogens. The NLRP3 inflammasome plays a key role in triggering caspase-1 dependent IL-1β maturation and resistance to fungal dissemination in Candida albicans infection. β-glucans are major components of fungal cell walls that trigger IL-1β secretion in both murine and human immune cells. In this study, we sought to determine the contribution of β-glucans to C. albicans-induced inflammasome responses in mouse dendritic cells. We show that the NLRP3-ASC-caspase-1 inflammasome is absolutely critical for IL-1β production in response to β-glucans. Interestingly, we also found that both Complement Receptor 3 (CR3/Mac-1) and dectin-1 play a crucial role in coordinating β-glucan-induced IL-1β processing as well as a cell death response. In addition to the essential role of caspase-1, we identify an important role for the pro-apoptotic protease caspase-8 in promoting β-glucan-induced cell death and NLRP3 inflammasome-dependent IL-1β maturation. A strong requirement for Complement Receptor 3 and caspase-8 was also found for NLRP3 dependent IL-1β production in response to heat killed Candida albicans. Together, these results define the importance of dectin-1, CR3 and caspase-8, in addition to the canonical NLRP3 inflammasome, in mediating β-glucan and C. albicans induced innate responses in dendritic cells. Collectively, these findings establish a novel link between β-glucan recognition receptors and the inflammatory proteases caspase-8 and caspase-1 in coordinating cytokine secretion and cell death in response to immunostimulatory fungal components.
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影响因子: --
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