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Adventitial fibroblasts direct smooth muscle cell-state transition in pulmonary vascular disease

ABSTRACT: Adventitial fibroblasts direct smooth muscle cell-state transition in pulmonary vascular disease

PROVIDER: PRJNA1090125 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR28400204_1.fastq.gz	Fastqsanger.gz
	SRR28400204_2.fastq.gz	Fastqsanger.gz
	SRR28400205_1.fastq.gz	Fastqsanger.gz
	SRR28400205_2.fastq.gz	Fastqsanger.gz
	SRR28400206_1.fastq.gz	Fastqsanger.gz

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Adventitial fibroblasts direct smooth muscle cell-state transition in pulmonary vascular disease

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Project description:We previously established that vascular smooth muscle-derived adventitial progenitor cells (AdvSca1-SM) preferentially differentiate into myofibroblasts and contribute to fibrosis in response to acute vascular injury. However, the role of these progenitor cells in chronic atherosclerosis has not been defined. Using an AdvSca1-SM cell lineage tracing model, scRNA-Seq, flow cytometry, and histological approaches, we confirmed that AdvSca1-SM-derived cells localized throughout the vessel wall and atherosclerotic plaques, where they primarily differentiated into fibroblasts, smooth muscle cells (SMCs), or remained in a stem-like state. Krüppel-like factor 4 (Klf4) knockout specifically in AdvSca1-SM cells induced transition to a more collagen-enriched fibroblast phenotype compared to WT mice. Additionally, Klf4 deletion drastically modified the phenotypes of non-AdvSca1-SM-derived cells, resulting in more contractile SMCs and atheroprotective macrophages. Functionally, overall plaque burden was not altered with Klf4 deletion, but multiple indices of plaque composition complexity, including necrotic core area, macrophage accumulation, and fibrous cap thickness, were reduced. Collectively, these data support that modulation of AdvSca1-SM cells through KLF4 depletion confers increased protection from the development of potential unstable atherosclerotic plaques.

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Project description:Smooth muscle-derived Sca1+ adventitial progenitor cells are tissue resident, multipotent stem cells that contribute to progression of vascular remodeling and fibrosis. Upon acute vascular injury, AdvSca1-SM cells differentiate into myofibroblasts and are embedded in perivascular collagen and matrix tissue. While the phenotypic properties of AdvSca1-SM-derived myofibroblasts have been defined, the underlying epigenetic regulators driving the differentiation trajectory of AdvSca1-SM cells to myofibroblasts are unclear. Here we show that the chromatin remodeler Smarca4/Brg1 facilitates AdvSca1-SM myofibroblast differentiation. Brg1 mRNA and protein was upregulated in AdvSca1-SM cells in vivo after acute vascular injury and pharmacological inhibition of the Brg1 bromodomain by the small molecule PFI-3 attenuated perivascular fibrosis and adventitial expansion. TGF-β1 stimulation of AdvSca1-SM cells in vitro reduced expression of stemness-related genes while inducing expression of myofibroblast genes that was associated with enhanced contractility; Brg1 inhibition blocked TGF-β1-induced phenotypic transition. Mechanistically, TGF-β1 promoted redistribution of Brg1 from distal regulatory sequences of stemness-related genes and recruitment of Brg1 to promoters of myofibroblast-related genes. This recruitment of Brg1 to myofibroblast genes was blocked in the presence of PFI-3. These data shed insight into epigenetic regulation of resident vascular progenitor cell differentiation and support that manipulating AdvSca1-SM phenotype will provide important anti-fibrotic clinical benefit.

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