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Origin and differentiation trajectories of fibroblastic reticular cells in the splenic white pulp - bulk RNAseq

ABSTRACT: Origin and differentiation trajectories of fibroblastic reticular cells in the splenic white pulp - bulk RNAseq

PROVIDER: PRJEB28026 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR2721430.fastq.gz	Fastqsanger.gz
	ERR2721440.fastq.gz	Fastqsanger.gz
	ERR2721450.fastq.gz	Fastqsanger.gz
	ERR2721460.fastq.gz	Fastqsanger.gz
	ERR2721470.fastq.gz	Fastqsanger.gz

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Origin and differentiation trajectories of fibroblastic reticular cells in the splenic white pulp - single cell RNAseq dataset 1

Project description:Splenic white pulp (WP) structures are underpinned by fibroblastic stromal cells (FSCs) to facilitate splenic compartmentalization and execute efficient immune responses. Although distinct WP FSCs exhibit various molecular traits, the origin and the hierarchical differentiation of different cell subsets are not characterized. Here we showed, the organization of splenic WP and the differentiation of WP FSCs were governed by lymphotoxin beta receptor (LTβR) signaling pathway. Cell fate mapping analysis revealed that different WP fibroblastic stromal cells descend from a common perivascular LTβR-sensitive mesenchymal lymphoid organizer cells (mLTo) at prenatal stage. Moreover, embryonic mLTo cells required LTβR signaling to give rise to different WP stromal cell subsets, while the proliferation of these cells was devoid of LTβR signaling but followed the development of WP during ontogeny. Moreover, cell fate mapping from different time point indicated a consecutive commitment of mLTo cells initiated from the proximal region around the splenic artery. RNAseq and differentiation trajectory analysis of distinct FSCs showed that Ltbr-deficient cells and perivascular reticular cells (PRCs) from adult spleen exhibited a progenitor phenotype and revealed a closer hierarchical lineage with embryonic mLTo cells. Taken together, our results unveil that embryonic mLTo cells residing in the perivascular niches can give rise to different FSC populations in a LTβR-dependent manner during development.

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Origin and differentiation trajectories of fibroblastic reticular cells in the splenic white pulp.

Project description:The splenic white pulp is underpinned by poorly characterized stromal cells that demarcate distinct immune cell microenvironments. Here we establish fibroblastic reticular cell (FRC)-specific fate-mapping in mice to define their embryonic origin and differentiation trajectories. Our data show that all reticular cell subsets descend from multipotent progenitors emerging at embryonic day 19.5 from periarterial progenitors. Commitment of FRC progenitors is concluded during the first week of postnatal life through occupation of niches along developing central arterioles. Single cell transcriptomic analysis facilitated deconvolution of FRC differentiation trajectories and indicated that perivascular reticular cells function both as adult lymphoid organizer cells and mural cell progenitors. The lymphotoxin-β receptor-independent sustenance of postnatal progenitor stemness unveils that systemic immune surveillance in the splenic white pulp is governed through subset specification of reticular cells from a multipotent periarterial progenitor cell. In sum, the finding that discrete signaling events in perivascular niches determine the differentiation trajectories of reticular cell networks explains the development of distinct microenvironmental niches in secondary and tertiary lymphoid tissues that are crucial for the induction and regulation of innate and adaptive immune processes.

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