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Hematopoietic stem and progenitor cells integrate microbial signals to promote gut tissue repair

ABSTRACT: Hematopoietic stem and progenitor cells integrate microbial signals to promote gut tissue repair

PROVIDER: PRJNA855248 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR19962935.fastq.gz	Fastqsanger.gz
	SRR19962936.fastq.gz	Fastqsanger.gz
	SRR19962937.fastq.gz	Fastqsanger.gz
	SRR19962938.fastq.gz	Fastqsanger.gz
	SRR19962939.fastq.gz	Fastqsanger.gz

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Project description:Bone marrow (BM)-resident hematopoietic stem and progenitor cells (HSPCs) are often activated following bacterial insults to replenish the host hemato-immune system, but how they integrate the associated tissue damage signals to initiate distal tissue repair is largely unknown. Here, we show that acute gut inflammation expands HSPCs in the BM and directs them to inflamed mesenteric lymph nodes through GM-CSFR activation for further expansion and potential differentiation into Ly6C+ /G+ myeloid cells specialized in gut tissue repair. We identified this process to be mediated by Bacteroides, a commensal gram-negative bacteria that activates innate immune signaling. These findings establish cross-organ communication between the BM and distant inflamed sites, whereby a certain subset of multipotent progenitors is specified to respond to imminent hematopoietic demands and to alleviate inflammatory symptoms.

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Project description:Understanding the mechanisms of repair and regeneration of the kidney after injury is of great interest because there are currently no therapies that promote repair, and kidneys frequently do not repair adequately. We studied the capacity of human CD34(+) hematopoietic stem/progenitor cells (HSPCs) to promote kidney repair and regeneration using an established ischemia/reperfusion injury model in mice, with particular focus on the microvasculature.Human HSPCs administered systemically 24 hours after kidney injury were selectively recruited to injured kidneys of immunodeficient mice (Jackson Labs, Bar Harbor, Me) and localized prominently in and around vasculature. This recruitment was associated with enhanced repair of the kidney microvasculature, tubule epithelial cells, enhanced functional recovery, and increased survival. HSPCs recruited to kidney expressed markers consistent with circulating endothelial progenitors and synthesized high levels of proangiogenic cytokines, which promoted proliferation of both endothelial and epithelial cells. Although purified HSPCs acquired endothelial progenitor markers once recruited to the kidney, engraftment of human endothelial cells in the mouse capillary walls was an extremely rare event, indicating that human stem cell mediated renal repair is by paracrine mechanisms rather than replacement of vasculature.These studies advance human HSPCs as a promising therapeutic strategy for promoting renal repair after injury.

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