Pathogen size alters C-type lectin receptor signaling in dendritic cells to influence CD4 Th9 cell differentiation.

Pathogen size alters C-type lectin receptor signaling in dendritic cells to influence CD4 Th9 cell differentiation.
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病原体大小改变树突状细胞c型凝集素受体信号传导,影响CD4 Th9细胞分化。

DOI:
10.1016/j.celrep.2022.110567
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发表时间:
2022-03-29
期刊:
影响因子:
8.8
通讯作者:
Underhill, David M.
Underhill, David M.
中科院分区:
生物学1区
文献类型:
--
作者:
Oh, Seeun;Li, Kai;Prince, Alexander;Wheeler, Matthew L.;Hamade, Hussein;Nguyen, Christopher;Michelsen, Kathrin S.;Underhill, David M.

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Dectin-1 recognizes β-glucan in fungal cell walls, and activation of Dectin-1 in dendritic cells (DCs) influences immune responses against fungi. Although many studies have shown that DCs activated via Dectin-1 induce different subsets of T helper cells according to different cytokine milieus, the mechanisms underlying such differences remain unknown. By harnessing polymorphic Candida albicans and polystyrene beads of different sizes, we find that target size influences production of cytokines that control differentiation of T helper cell subsets. Hyphal C. albicans and large beads activate DCs but cannot be phagocytosed due to their sizes, which prolongs the duration of Dectin-1 signaling. Transcriptomic analysis reveals that expression of Il33 is significantly increased by larger targets, and increased IL-33 expression promotes TH9 responses. Expression of IL-33 is regulated by the Dectin-1-SYK-PLCγ-CARD9-ERK pathway. Altogether, our study demonstrates that size of fungi can be a determining factor in how DCs induce context-appropriate adaptive immune responses. Oh et al. show that dendritic cells exposed to C. albicans hyphae more strongly induce IL-9-producing T cells compared with cells exposed to yeast. They find that this TH9 response is driven in large part by Dectin-1 sensing microbe size, leading to elevated production of IL-33.
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