Alveolar macrophages rely on GM-CSF from alveolar epithelial type 2 cells before and after birth.

Alveolar macrophages rely on GM-CSF from alveolar epithelial type 2 cells before and after birth.
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DOI:
10.1084/jem.20210745
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发表时间:
2021-10-04
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Schneider C
Schneider C
中科院分区:
其他
文献类型:
--
作者:
Gschwend J;Sherman SPM;Ridder F;Feng X;Liang HE;Locksley RM;Becher B;Schneider C

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这项研究确定了AT 2作为GM-CSF的相关来源,用于肺泡巨噬细胞的发育和维持。在器官发生过程中,新生AT 2以完美的定时方式诱导GM-CSF表达,以支持同时接种胚胎肺的胎儿单核细胞的增殖和分化。定义组织驻留巨噬细胞身份的程序依赖于局部环境线索。对于肺泡巨噬细胞(AM),这些信号由免疫和非免疫细胞提供,包括GM-CSF(CSF 2)。然而,在功能上连接这种细胞间串扰的证据仍然很少。因此,我们开发了新的转基因小鼠来分析肺部GM-CSF表达,我们在两种免疫细胞中检测到了这种表达,包括第2组先天淋巴细胞和γδ T细胞以及AT 2。AM不受造血Csf 2组成性缺失和嗜碱性粒细胞耗竭的影响。相反,AT 2谱系特异性组成型和诱导型Csf 2缺失揭示了AT 2衍生的GM-CSF在指导AM命运、建立出生后AM隔室和维持成人肺中的AM中的非冗余功能。这种AT 2-AM关系在胚胎发生期间开始,其中新生AT 2适时诱导GM-CSF表达以支持同时接种组织的胎儿单核细胞的增殖和分化,并且持续到成年期,此时上皮GM-CSF仍然限于AT 2。
This study identifies AT2s as the relevant source of GM-CSF for the development and maintenance of alveolar macrophages. During organogenesis, nascent AT2s induce GM-CSF expression in a perfectly timed manner to support the proliferation and differentiation of fetal monocytes that contemporaneously seed the embryonic lungs. Programs defining tissue-resident macrophage identity depend on local environmental cues. For alveolar macrophages (AMs), these signals are provided by immune and nonimmune cells and include GM-CSF (CSF2). However, evidence to functionally link components of this intercellular cross talk remains scarce. We thus developed new transgenic mice to profile pulmonary GM-CSF expression, which we detected in both immune cells, including group 2 innate lymphoid cells and γδ T cells, as well as AT2s. AMs were unaffected by constitutive deletion of hematopoietic Csf2 and basophil depletion. Instead, AT2 lineage-specific constitutive and inducible Csf2 deletion revealed the nonredundant function of AT2-derived GM-CSF in instructing AM fate, establishing the postnatal AM compartment, and maintaining AMs in adult lungs. This AT2-AM relationship begins during embryogenesis, where nascent AT2s timely induce GM-CSF expression to support the proliferation and differentiation of fetal monocytes contemporaneously seeding the tissue, and persists into adulthood, when epithelial GM-CSF remains restricted to AT2s.
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