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The effects of epicardial-specific deletion of Sox9 on parietal mitral valve leaflet development

ABSTRACT: The effects of epicardial-specific deletion of Sox9 on parietal mitral valve leaflet development

PROVIDER: PRJNA989220 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25078900_1.fastq.gz	Fastqsanger.gz
	SRR25078900_2.fastq.gz	Fastqsanger.gz
	SRR25078901_1.fastq.gz	Fastqsanger.gz
	SRR25078901_2.fastq.gz	Fastqsanger.gz
	SRR25078902_1.fastq.gz	Fastqsanger.gz

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The effects of epicardial-specific deletion of Sox9 on parietal mitral valve leaflet development

Project description:The overall goal of this study is to determine the transcriptomic consequences of the absence of epicardial-derived cells in the parietal leaflets of the atrioventricular valves as a consequence of epicardial deletion of Sox9.

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Project description:Mitral valve prolapse (MVP) is often benign but can progress to mitral regurgitation, requiring invasive treatment. In mgR mice with hypomorphic Fbn1 mutations—mimicking Marfan syndrome—myxomatous mitral degeneration and regurgitation develop by 12 weeks. TGF-β and mTOR signaling activation, along with macrophage infiltration, appear by 4 weeks, before histological changes. Short-term rapamycin treatment blocks early TGF-β activation and inflammation, while long-term mTOR or TGF-β inhibition rescues valve degeneration. Transcriptomics revealed integrins as upstream regulators of mTOR. Blocking integrin signaling or altering its pathway prevented mTOR activation. These findings are conserved in human MVP, suggesting that mTOR activation via abnormal integrin-matrix signaling drives disease and that mTOR inhibition may be a potential therapy.

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Normal human mitral valve proteome: a preliminary investigation by gel-based and gel-free proteomic approaches

Project description:The mitral valve is a highly complex structure which regulates blood flow from the left atrium to the left ventricle (LV) avoiding a significant forward gradient during diastole or regurgitation during systole. The integrity of the mitral valve is also essential for the maintenance of normal LV size, geometry, and function. Significant advances in the comprehension of the biological, functional, and mechanical behavior of the mitral valve have recently been made. However, current knowledge of protein components in the normal human mitral valve is still limited and complicated by the low cellularity of this tissue and the presence of high abundant proteins from the extracellular matrix. We employed here an integrated proteomic approach to analyse the protein composition of the normal human mitral valve and reported confident identification of 422 proteins, some of which have not been previously described in this tissue. In particular, we described the ability of pre-MS separation technique based on liquid-phase IEF and SDS-PAGE to identify the largest number of proteins. These initial results provide a valuable basis for future studies aimed at analysing in depth the mitral valve protein composition and at investigating potential pathogenetic molecular mechanisms.

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Project description:We here report the results of a mitral valve transcriptome study designed to identify genes and molecular pathways involved in development of congestive heart failure (CHF) following myxomatous mitral valve disease (MMVD) in dogs. The study is focused on a cohort of elderly age-matched dogs (n=34, age ~10 years) from a single breed – Cavalier King Charles Spaniels (CKCS) – with a high incidence of MMVD. The cohort comprises 19 dogs (10♀, 9♂) without MMVD-associated CHF, and 15 dogs (6♀, 9♂) with CHF caused by MMVD. I.e. we compare gene expression in breed and age matched groups of dogs, which only differ with respect to CHF status. We identify 56 genes, which are differentially expressed between the two groups. In this list of genes, we confirm an enrichment of genes related to the TNFβ signaling pathway, extracellular matrix organization, vascular development, and endothelium damage, which also have been identified in previous studies. However, the genes with the greatest difference in expression between the two groups are CNTN3 and MYH1. Both genes encode proteins, which are predicted to have an effect on the contractile activity of myocardial cells, which in turn may have an effect on valvular performance and hemodynamics across the mitral valve. This may result in shear forces with impact on MMVD progression.

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