Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai, China.
Chinese Academy of Sciences (CAS) Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institutes for Biological Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China.
Front Immunol. 2022 Jul 8;13:923424. doi: 10.3389/fimmu.2022.923424. eCollection 2022.
Innate lymphoid cells (ILCs) develop from ILC progenitors in the bone marrow. Various ILC precursors (ILCPs) with different ILC subset lineage potentials have been identified based on the expression of cell surface markers and ILC-associated key transcription factor reporter genes. This study characterized an interleukin (IL)-7RαIL-18Rα ILC progenitor population in the mouse bone marrow with multi-ILC lineage potential on the clonal level. Single-cell gene expression analysis revealed the heterogeneity of this population and identified several subpopulations with specific ILC subset-biased gene expression profiles. The role of IL-18 signaling in the regulation of IL-18Rα ILC progenitors and ILC development was further investigated using and deficient mice, differentiation assay, and adoptive transfer model. IL-18/IL-18R-mediated signal was found to not be required for early stages of ILC development. While lymphoid progenitors were able to generate all ILC subsets and like the wild-type counterpart, increased IL-18 level, as often occurred during infection or under stress, suppressed the growth of ILCP/ILC in an IL-18Ra-dependent manner inhibiting proliferation and inducing apoptosis.
先天淋巴细胞 (ILC) 由骨髓中的 ILC 祖细胞发育而来。基于细胞表面标志物和 ILC 相关关键转录因子报告基因的表达,已经鉴定出各种具有不同 ILC 亚群分化潜能的 ILC 前体 (ILCP)。本研究在小鼠骨髓中鉴定出一种具有多种 ILC 谱系潜能的 IL-7RαIL-18Rα ILC 祖细胞群体,在克隆水平上具有多 ILC 谱系潜能。单细胞基因表达分析揭示了该群体的异质性,并确定了具有特定 ILC 亚群偏向基因表达谱的几个亚群。使用 和缺陷小鼠、 分化测定和过继转移模型进一步研究了 IL-18 信号在调节 IL-18Rα ILC 祖细胞和 ILC 发育中的作用。发现 IL-18/IL-18R 介导的信号对于 ILC 发育的早期阶段不是必需的。虽然 淋巴祖细胞能够产生所有的 ILC 亚群, 和野生型一样,但增加的 IL-18 水平,如在感染或应激下经常发生的那样,以 IL-18Ra 依赖的方式抑制 ILCP/ILC 的生长, 抑制增殖并诱导细胞凋亡。