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Bulk RNA-seq of Fibroblastic Reticular Cells

ABSTRACT: Bulk RNA-seq of Fibroblastic Reticular Cells

PROVIDER: PRJEB43610 | ENA |

REPOSITORIES: ENA

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Bulk RNA-seq of Fibroblastic Reticular Cells

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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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