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Cx43 in Cdh5+ cells maintains blood-brain barrier integrity by NAD+ during aging

ABSTRACT: Cx43 in Cdh5+ cells maintains blood-brain barrier integrity by NAD+ during aging

PROVIDER: PRJNA723191 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14279707_1.fastq.gz	Fastqsanger.gz
	SRR14279707_2.fastq.gz	Fastqsanger.gz
	SRR14279708_1.fastq.gz	Fastqsanger.gz
	SRR14279708_2.fastq.gz	Fastqsanger.gz
	SRR14279709_1.fastq.gz	Fastqsanger.gz

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Cx43 in Cdh5+ cells maintains blood-brain barrier integrity by NAD+ during aging

Project description:Blood-brain barrier (BBB) function deteriorates during aging, contributing to cognitive impairment and neurodegeneration. It is unclear what drives BBB leakage in aging and how it can be prevented. Using single-nucleus transcriptomics, we identified decreased connexin 43 (CX43) expression in Cadherin-5+ (Cdh5+) cerebral vascular cells in naturally aging mice and confirmed it in human brain samples. Global or Cdh5+ cell-specific CX43 deletion in mice exacerbated BBB dysfunction during aging. The CX43-dependent effect was not due to its canonical gap junction function but was associated with reduced NAD+ levels and mitochondrial dysfunction through NAD+-dependent sirtuin 3. CX43 interacts with and negatively regulates poly (ADP-ribose) polymerase 1 (PARP1). Pharmacologic inhibition of PARP1 by olaparib or nicotinamide mononucleotide supplementation rescued NAD+ levels and alleviated aging-associated BBB leakage. These findings establish the endothelial CX43-PARP1-NAD+ pathway’s role in vascular aging and identify a potential therapeutic strategy to combat aging-associated BBB leakage with neuroprotective implications.

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