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Adventitial stromal cells define group 2 innate lymphoid cell tissue niches

ABSTRACT: Adventitial stromal cells define group 2 innate lymphoid cell tissue niches

PROVIDER: PRJNA516577 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8476550.fastq.gz	Fastqsanger.gz
	SRR8476547.fastq.gz	Fastqsanger.gz
	SRR8476548.fastq.gz	Fastqsanger.gz
	SRR8476549.fastq.gz	Fastqsanger.gz

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Adventitial stromal cells define group 2 innate lymphoid cell tissue niches

Project description:We identify a subset of IL-33 expressing adventitial stromal cells as local regulators of ILC2s Type 2 lymphocytes promote both physiologic tissue remodeling and allergic pathology, yet their physical tissue niches are poorly described. In this study, we used quantitative imaging together with scRNAseq to define tissue niches of group 2 innate lymphoid cells (ILC2s), critical instigators of type 2 immunity. We identified a dominant adventitial cuff niche around lung bronchi and larger vessels in multiple tissues, where ILC2s localized with subsets of dendritic and regulatory T cells. However, ILC2s were most intimately associated with adventitial stromal cells (ASC), a mesenchymal fibroblast-like subset that expressed Interleukin-33 (IL-33) and thymic stromal lymphopoietin (TSLP) and supported ILC2s and tissue-resident Th2 cells.

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Adventitial Stromal Cells Define Group 2 Innate Lymphoid Cell Tissue Niches.

Project description:Type 2 lymphocytes promote both physiologic tissue remodeling and allergic pathology, yet their physical tissue niches are poorly described. Here, we used quantitative imaging to define the tissue niches of group 2 innate lymphoid cells (ILC2s), which are critical instigators of type 2 immunity. We identified a dominant adventitial niche around lung bronchi and larger vessels in multiple tissues, where ILC2s localized with subsets of dendritic and regulatory T cells. However, ILC2s were most intimately associated with adventitial stromal cells (ASCs), a mesenchymal fibroblast-like subset that expresses interleukin-33 (IL-33) and thymic stromal lymphopoietin (TSLP). In vitro, ASCs produced TSLP that supported ILC2 accumulation and activation. ILC2s and IL-13 drove reciprocal ASC expansion and IL-33 expression. During helminth infection, ASC depletion impaired lung ILC2 and Th2 cell accumulation and function, which are in part dependent on ASC-derived IL-33. These data indicate that adventitial niches are conserved sites where ASCs regulate type 2 lymphocyte expansion and function.

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Intestinal fibroblastic reticular cell niches control innate lymphoid cell homeostasis and function - Innate lymphoid cells

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Project description:Innate lymphoid cells (ILC) in the small intestine govern immune homeostasis and protect the host against gut pathogens. While distinct cell-intrinsic signals have been identified that determine ILC development and differentiation, it has remained unclear which cell population regulates ILC sustenance. Using unbiased single cell RNA transcriptomic analysis of intestinal fibroblasts, we have identified a specialized Ccl19-expressing fibroblastic reticular cell (FRC) population that underpins solitary intestinal lymphoid tissue (SILT) structures including cryptopatches and isolated lymphoid follicles. Conditional ablation of lymphotoxin-β receptor (LTβR) signalling in SILT FRC impeded the maturation of isolated lymphoid follicles and blocked ILC maintenance through the downregulation of IL-7, consequently resulting in the elevated susceptibility to bacterial infection. Moreover, specific Ltbr ablation in FRC during adulthood revealed that constant LTβR-dependent FRC-ILC interaction is required to maintain SILT structures and ILC populations. Taken together, our study unveils a critical intestinal FRC niche that secures protective gut immunity.

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Adventitial tertiary lymphoid organs in AAA are a potential source of miRNAs as biomarkers

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