Department of Microbiology and Immunology, Dartmouth Geisel School of Medicine, Hanover, NH, USA.
Dartmouth Cancer Center, Dartmouth Geisel School of Medicine, Hanover, NH, USA.
Nat Immunol. 2024 Jun;25(6):1110-1122. doi: 10.1038/s41590-024-01826-9. Epub 2024 May 2.
Lung-resident macrophages, which include alveolar macrophages and interstitial macrophages (IMs), exhibit a high degree of diversity, generally attributed to different activation states, and often complicated by the influx of monocytes into the pool of tissue-resident macrophages. To gain a deeper insight into the functional diversity of IMs, here we perform comprehensive transcriptional profiling of resident IMs and reveal ten distinct chemokine-expressing IM subsets at steady state and during inflammation. Similar IM subsets that exhibited coordinated chemokine signatures and differentially expressed genes were observed across various tissues and species, indicating conserved specialized functional roles. Other macrophage types shared specific IM chemokine profiles, while also presenting their own unique chemokine signatures. Depletion of CD206 IMs in Pf4R26 and Pf4R26Cx3cr1 mice led to diminished inflammatory cell recruitment, reduced tertiary lymphoid structure formation and fewer germinal center B cells in models of allergen- and infection-driven inflammation. These observations highlight the specialized roles of IMs, defined by their coordinated chemokine production, in regulating immune cell influx and organizing tertiary lymphoid tissue architecture.
肺组织驻留巨噬细胞包括肺泡巨噬细胞和间质巨噬细胞 (IMs),表现出高度的多样性,通常归因于不同的激活状态,并且常常因单核细胞流入组织驻留巨噬细胞池而变得复杂。为了更深入地了解 IMs 的功能多样性,我们对驻留 IMs 进行了全面的转录谱分析,并在稳态和炎症期间揭示了十种不同的趋化因子表达的 IM 亚群。在不同的组织和物种中观察到具有协调趋化因子特征和差异表达基因的相似 IM 亚群,表明存在保守的专门功能作用。其他巨噬细胞类型共享特定的 IM 趋化因子特征,同时也呈现出自己独特的趋化因子特征。在 Pf4R26 和 Pf4R26Cx3cr1 小鼠中耗尽 CD206 IMs 会导致过敏原和感染驱动的炎症模型中炎症细胞募集减少、三级淋巴样结构形成减少和生发中心 B 细胞减少。这些观察结果强调了 IMs 的专门作用,其特征是其协调的趋化因子产生,在调节免疫细胞浸润和组织三级淋巴样组织结构方面。
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