An interactive resource of molecular signalling in the developing human haematopoietic stem cell (HSC) niche
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA975083 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR24686300_1.fastq.gz | Fastqsanger.gz | |||
| SRR24686300_2.fastq.gz | Fastqsanger.gz | |||
| SRR24686301_1.fastq.gz | Fastqsanger.gz | |||
| SRR24686301_2.fastq.gz | Fastqsanger.gz | |||
| SRR24686302_1.fastq.gz | Fastqsanger.gz |
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Project description:The emergence of definitive human haematopoietic stem cells (HSCs) during Carnegie Stages (CS) 14-17 in the aorta-gonad-mesonephros (AGM) region is a complex and tightly regulated process. In a previous study we conducted spatial transcriptomic analysis of the human AGM region at the end of this period (CS16/17) and identified secreted factors involved in HSC development. Here, we extend our analysis to investigate the progression of dorso-ventral polarized signalling around the dorsal aorta over the entire period of HSC emergence. Our results reveal a dramatic increase in signalling complexity from the CS13 to CS14 transition, coinciding with the activation of endothelial-to-haematopoietic transition (EHT) in the ventral domain of the dorsal aorta. We further observe stage-specific changes in signalling complexity up to CS17. Signalling progression described here may underpin step-wise maturation of HSCs described in the mouse model. A data-rich bioinformatics resource presented here along with an interactive online interface enables in silico analysis of molecular interactions between spatially defined domains of the AGM region. This resource will be of particular interest for researchers studying mechanisms underlying human HSC development as well as those developing in vitro methods for the generation of clinically relevant HSCs from pluripotent stem cells.
2023-10-31 | GSE233130 | GEO
Project description:The emergence of definitive human haematopoietic stem cells (HSCs) during Carnegie Stages (CS) 14-17 in the aorta-gonad-mesonephros (AGM) region is a complex and tightly regulated process. In a previous study we conducted spatial transcriptomic analysis of the human AGM region at the end of this period (CS16/17) and identified secreted factors involved in HSC development. Here, we extend our analysis to investigate the progression of dorso-ventral polarized signalling around the dorsal aorta over the entire period of HSC emergence. Our results reveal a dramatic increase in signalling complexity from the CS13 to CS14 transition, coinciding with the activation of endothelial-to-haematopoietic transition (EHT) in the ventral domain of the dorsal aorta. We further observe stage-specific changes in signalling complexity up to CS17. Signalling progression described here may underpin step-wise maturation of HSCs described in the mouse model. A data-rich bioinformatics resource presented here along with an interactive online interface enables in silico analysis of molecular interactions between spatially defined domains of the AGM region. This resource will be of particular interest for researchers studying mechanisms underlying human HSC development as well as those developing in vitro methods for the generation of clinically relevant HSCs from pluripotent stem cells.
2023-10-31 | GSE233126 | GEO
Project description:An interactive resource of molecular signalling in the developing human haematopoietic stem cell (HSC) niche [scRNA-seq]
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Project description:An interactive resource of molecular signalling in the developing human haematopoietic stem cell (HSC) niche [LCM-Seq]
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Project description:This SuperSeries is composed of the SubSeries listed below.
2023-10-31 | GSE233132 | GEO
Project description:The emergence of definitive human haematopoietic stem cells (HSCs) from Carnegie Stage (CS) 14 to CS17 in the aorta-gonad-mesonephros (AGM) region is a tightly regulated process. Previously, we conducted spatial transcriptomic analysis of the human AGM region at the end of this period (CS16/CS17) and identified secreted factors involved in HSC development. Here, we extend our analysis to investigate the progression of dorso-ventral polarised signalling around the dorsal aorta over the entire period of HSC emergence. Our results reveal a dramatic increase in ventral signalling complexity from the CS13-CS14 transition, coinciding with the first appearance of definitive HSCs. We further observe stage-specific changes in signalling up to CS17, which may underpin the step-wise maturation of HSCs described in the mouse model. The data-rich resource is also presented in an online interface enabling in silico analysis of molecular interactions between spatially defined domains of the AGM region. This resource will be of particular interest for researchers studying mechanisms underlying human HSC development as well as those developing in vitro methods for the generation of clinically relevant HSCs from pluripotent stem cells.
| S-EPMC10730088 | biostudies-literature
Project description:Severe infections are a major stress on haematopoiesis, where the consequences for haematopoietic stem cells (HSCs) have only recently started to emerge. HSC function critically depends on the integrity of complex bone marrow (BM) niches, however whether the BM microenvironment plays a role in mediating the effects of infection on HSCs remains an open question. Here, using a murine model of malaria and combining single cell RNA sequencing, mathematical modelling, transplantation assays and intravital microscopy, we show that haematopoiesis is reprogrammed upon infection, whereby the HSC compartment turns over significantly faster than in steady-state and HSC function is drastically affected as a result. Interferon is found to affect both haematopoietic and mesenchymal BM cells and we specifically identify a dramatic loss of osteoblasts and alterations in endothelial cell function. Osteo-active parathyroid hormone treatment abolishes infection-triggered HSC proliferation and, coupled with Reactive Oxygen Species quenching, enables partial rescuing of HSC function.
2020-09-10 | GSE156410 | GEO
Project description:Haematopoietic stem cells (HSCs) first emerge in the embryonic aorta-gonad-mesonephros (AGM) region. Studies on model organisms defined intersecting signalling pathways that converge to promote HSC emergence predominantly in the ventral domain of the dorsal aorta. Much less is known about mechanisms driving HSC development in human. Here, to identify secreted signals underlying human HSC development, we combined spatial transcriptomics analysis of dorso-ventral polarised signalling in the aorta with gene expression profiling of sorted cell populations and single cells. Our analysis revealed a subset of aortic endothelial cells with downregulated arterial signature and a predicted lineage relationship with the emerging HSC/ progenitor population. Analysis of the ventrally polarised molecular landscape identified endothelin 1 as an important secreted regulator of human HSC development. The obtained gene expression datasets will inform future studies on mechanisms of HSC development in vivo and on the generation of clinically relevant HSCs in vitro.
2020-09-17 | GSE151877 | GEO
Project description:Myeloproliferative neoplasms (MPNs) are diseases caused by mutations in the haematopoietic stem cell (HSC) compartment. Most MPN patients have a common acquired mutation of Janus kinase 2 (JAK2) gene in HSCs that renders this kinase constitutively active, leading to uncontrolled cell expansion. The bone marrow (BM) microenvironment might contribute to the clinical outcomes of this common event. We previously showed that BM nestin+ mesenchymal stem cells (MSCs) innervated by sympathetic nerve fibres regulate normal HSCs. Here we demonstrate that abrogation of this regulatory circuit is essential for MPN pathogenesis. Sympathetic nerve fibres, supporting Schwann cells and nestin+ MSCs are consistently reduced in the BM of MPN patients and mice expressing the human JAK2V617F mutation in HSCs. Unexpectedly, MSC reduction is not due to differentiation but is caused by BM neural damage and Schwann cell death triggered by interleukin-1b produced by mutant HSCs. In turn, in vivo depletion of nestin+ cells or their production of CXCL12 expanded mutant HSCs and accelerated MPN progression. In contrast, administration of neuroprotective or sympathomimetic drugs prevented mutant HSC expansion. Treatment with b3-adrenergic agonists that restored the sympathetic regulation of nestin+ MSCs prevented the loss of these cells and blocked MPN progression by indirectly reducing leukaemic stem cells. Our results demonstrate that mutant HSC-driven niche damage critically contributes to disease manifestation in MPN and identify niche-forming MSCs and their neural regulation as promising therapeutic targets. CD45- CD31- Ter119- GFP+ cells were sorted from the BM of Nes-gfp;Mx1-cre;JAK2-V617F mice and control littermates 6 weeks after pIpC treatment and were subjected to RNA sequencing. Each sample was pooled from 3 animals of the same genotype.
2014-03-12 | E-GEOD-55798 | biostudies-arrayexpress
Project description:Haematopoietic stem cells (HSCs) reside in bone marrow (BM) niches where they are maintained to replenish all blood cell lineages throughout life. Among the constituents of the murine HSC niches, various cell types such as CXCL12-abundant reticular (CAR) cells, Nestin-GFP+ perivascular cells, leptin receptor (LepR)+ cells, endothelial cells, osteoblasts, sympathetic nerves, macrophages and megakaryocytes in the BM have been proposed to contribute to HSC niche activity. When niche cells are removed from their natural habitat, the ability to maintain HSCs ex vivo is markedly diminished. Mesenchymal-derived stromal cells (MSCs) identified by Nestin-GFP express high levels of niche factors in vivo, but their expression is downregulated rapidly upon culture, suggesting that alterations in transcriptional rewiring may contribute to the reduced HSC maintenance potential. We found that the enforced expression of 5 genes (Klf7, Ostf1, Xbp1, Irf3 and Irf7) markedly restored HSC niche function in cultured BM-derived MSCs. These revitalized MSCs (rMSCs) exhibited boosted synthesis of HSC niche factors while retaining their mesenchymal lineage differentiation capacity. By contrast to HSCs co-cultured with control MSCs, HSCs expanded with rMSCs showed significantly higher repopulation capacity. To evaluate to what extent rMSCs are reprogrammed toward freshly isolated MSCs, we compared, by RNA-seq analysis, the transcriptome of freshly sorted CD45(-) Ter119(-) CD31(-) Scf-GFP(-) cells, CD45(-) Ter119(-) CD31(-) Scf-GFP(+) cells, rMSCs and control vector-transduced stroma. HSC niche-associated genes were highly expressed in both native Scf-GFP(+) stromal cells and rMSCs compared to the Scf-GFP cell fraction and control MSCs. With the motif analysis of ATAC-seq data, we found that myocyte enhancer factor 2c (Mef2c) is one of the key factor in the revitalization of MSCs. These results suggest that rMSC may provide a promising platform for curative transplantation therapies.
2019-04-05 | GSE112232 | GEO