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Investigation of mRNA expression pattern by RAD21 knockdown in hematopoetic stem cells

ABSTRACT: Investigation of mRNA expression pattern by RAD21 knockdown in hematopoetic stem cells

PROVIDER: PRJNA433698 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6704930.fastq.gz	Fastqsanger.gz
	SRR6704931.fastq.gz	Fastqsanger.gz
	SRR6704932.fastq.gz	Fastqsanger.gz
	SRR6704933.fastq.gz	Fastqsanger.gz
	SRR6704924.fastq.gz	Fastqsanger.gz

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Investigation of mRNA expression pattern by RAD21 knockdown in hematopoetic stem cells

Project description:Elevated inflammation represents a hallmark of hematopoietic aging and leukemia development but mechanistically its impact on hematopoietic stem and progenitor cell (HSPC) maintenance remains incompletely understood. Here we identify Rad21/cohesin as a major component mediating inflammation-induced NF-kB signaling, which in turn limits self-renewal of HSPCs by induction of differentiation. Disruption of Rad21/cohesin diminishes inflammation-induced loss of self-renewal and induction of differentiation, but these effects are abrogated in NF-kB knockout (p50-/-) HSPCs. During aging, HSPCs exhibit an increased responsiveness to activate NF-kB signaling in response to inflammatory stimuli also resulting in activation of genes encoding for secreted cytokines. These cell intrinsic and extrinsic responses cooperatively enhance differentiation and loss of self-renewal of HSPCs resulting in increased selection of Rad21/cohesin deficient HSPCs exhibiting elevated self-renewal and myeloid skewed differentiation. Together, these results identify cohesin-mediated NF-kB signaling as a major axis connecting cell extrinsic increases in inflammation with the evolution of hallmark features HSC aging characterized by increases in self renewal and myeloid skewed differentiation aggravated by the concomitant selection of cohesin deficient HSPCs.

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Project description:MTD project_description Inflammation and decreased stem cell function characterize organism aging, yet the relationship between these factors remains incompletely understood. This study shows that aged hematopoietic stem and progenitor cells exhibit increased ground-stage NF-κB activity, which enhances their responsiveness to undergo differentiation and loss of self-renewal in response to inflammation. The study identifies Rad21/cohesin as a critical mediator of NF-κB signals, by increasing chromatin accessibility of inter-/intra-genic and enhancer regions. Rad21/NF-κB are required for normal differentiation, but limit self-renewal of hematopoietic stem cells (HSCs) during aging and inflammation in an NF-κB dependent manner. HSCs from aged mice fail to downregulate Rad21/cohesin and inflammation/differentiation inducing signals in the resolution phase after acute inflammation. and The inhibition of cohesin/NF-κB is sufficient to revert the hypersensitivity of aged HSPCs to inflammation-induced differentiation. During aging, myeloid-biased HSCs with disrupted and naturally occurring reduced expression of Rad21/cohesin are increasingly selected over lymphoid-biased HSCs. Together, Rad21/cohesin mediated NF-κB signaling limits HSPC function during aging and selects for cohesin deficient HSCs with myeloid skewed differentiation.

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