Transcription Factor RUNX3 Mediates Plasticity of ThGM Cells Toward Th1 Phenotype.

Transcription Factor RUNX3 Mediates Plasticity of ThGM Cells Toward Th1 Phenotype.
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DOI:
10.3389/fimmu.2022.912583
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发表时间:
2022
影响因子:
7.3
通讯作者:
Rostami, Abdolmohamad
Rostami, Abdolmohamad
中科院分区:
医学2区
文献类型:
--
作者:
Rasouli, Javad;Casella, Giacomo;Zhang, Weifeng;Xiao, Dan;Kumar, Gaurav;Fortina, Paolo;Zhang, Guang-Xian;Ciric, Bogoljub;Rostami, Abdolmohamad

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产生 GM-CSF 的辅助性 T (Th) 细胞在多发性硬化症 (MS) 等自身免疫性疾病的发病机制中发挥着至关重要的作用。最近的研究发现了一个独特的产生 GM-CSF 的 Th 细胞群,称为 ThGM 细胞,它们也表达细胞因子 TNF、IL-2 和 IL-3,但缺乏主转录因子 (TF) 和常见的 Th 细胞谱系的标志性细胞因子的表达。 ThGM 细胞在 MS(实验性自身免疫性脑脊髓炎 (EAE))小鼠模型中具有高度致脑炎性。与 Th17 细胞类似,ThGM 细胞响应 IL-12,上调 T-bet 和 IFN-γ 的表达,并将其表型转变为 Th1。在这里我们表明,除了 T-bet 之外,TF RUNX3 也有助于 ThGM 细胞的 Th1 转换。 EAE 小鼠 CNS 中 T-bet 缺陷的 ThGM 细胞 RUNX3 表达较低,ThGM 细胞中 RUNX3 表达的敲低消除了 IL-12 的 Th1 诱导作用。 ThGM 和 Th1 细胞转录组的比较表明,ThGM 细胞表达一组已知可抑制其他 Th 谱系发育的 TF。 ThGM 细胞缺乏谱系特异性细胞因子和 TF 的表达,以及抑制其他 Th 谱系发育的 TF 的表达,表明 ThGM 细胞是具有谱系特征的 Th 细胞的非极化子集。
GM-CSF-producing T helper (Th) cells play a crucial role in the pathogenesis of autoimmune diseases such as multiple sclerosis (MS). Recent studies have identified a distinct population of GM-CSF-producing Th cells, named ThGM cells, that also express cytokines TNF, IL-2, and IL-3, but lack expression of master transcription factors (TF) and signature cytokines of commonly recognized Th cell lineages. ThGM cells are highly encephalitogenic in a mouse model of MS, experimental autoimmune encephalomyelitis (EAE). Similar to Th17 cells, in response to IL-12, ThGM cells upregulate expression of T-bet and IFN-γ and switch their phenotype to Th1. Here we show that in addition to T-bet, TF RUNX3 also contributes to the Th1 switch of ThGM cells. T-bet-deficient ThGM cells in the CNS of mice with EAE had low expression of RUNX3, and knockdown of RUNX3 expression in ThGM cells abrogated the Th1-inducing effect of IL-12. Comparison of ThGM and Th1 cell transcriptomes showed that ThGM cells expressed a set of TFs known to inhibit the development of other Th lineages. Lack of expression of lineage-specific cytokines and TFs by ThGM cells, together with expression of TFs that inhibit the development of other Th lineages, suggests that ThGM cells are a non-polarized subset of Th cells with lineage characteristics.
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