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Cell size is a determinant of stem cell potential during aging (HSC size-fractionation RNA-seq dataset)

ABSTRACT: Cell size is a determinant of stem cell potential during aging (HSC size-fractionation RNA-seq dataset)

PROVIDER: PRJNA645903 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12211282.fastq.gz	Fastqsanger.gz
	SRR12211283.fastq.gz	Fastqsanger.gz
	SRR12211284.fastq.gz	Fastqsanger.gz
	SRR12211285.fastq.gz	Fastqsanger.gz
	SRR12211286.fastq.gz	Fastqsanger.gz

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Cell size is a determinant of stem cell potential during aging (HSC size-fractionation RNA-seq dataset)

Project description:Stem cells are remarkably small in size. Human hematopoietic stem cells (HSCs) measure a mere 7 μm in diameter. Whether small size is important for stem cell function is unknown. We find that murine HSCs enlarge under conditions known to decrease stem cell function. This decreased fitness of large HSCs is due to reduced proliferative potential. We further show that preventing HSC enlargement by inhibiting macromolecule biosynthesis or reducing the size of large HSCs by shortening G1 averts the loss of stem cell potential. Naturally large HSCs also exhibit decreased stem cell potential indicating that large size characterizes exhausted HSCs under physiological conditions. Finally, we show that our findings are relevant to aging. A fraction of murine and human HSCs enlarge during aging. Preventing this age-dependent enlargement improves HSC function. We conclude that small cell size is important for stem cell function and propose that stem cell enlargement contributes to their functional decline during aging.

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Project description:Decline in skeletal muscle cell size (myofiber atrophy) is a key feature of cancer-induced wasting (cachexia). In particular, atrophy of the diaphragm, the major muscle responsible for breathing, is an important determinant of cancer-associated mortality. However, therapeutic options are limited. Here, we have used Drosophila transgenic screening to identify muscle-secreted factors (myokines) that act as paracrine regulators of myofiber growth. Subsequent testing in mouse myotubes revealed that mouse Fibcd1 is an evolutionary-conserved myokine that preserves myofiber size via ERK signaling. Local administration of recombinant Fibcd1 (rFibcd1) ameliorates cachexia-induced myofiber atrophy in the diaphragm of mice bearing patient-derived melanoma xenografts and LLC carcinomas. Moreover, rFibcd1 impedes cachexia-associated transcriptional changes in the diaphragm. Fibcd1-induced signaling appears to be muscle selective because rFibcd1 increases ERK activity in myotubes but not in several cancer cell lines tested. We propose that rFibcd1 may help reinstate myofiber size in the diaphragm of patients with cancer cachexia.

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