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MiR-181b Targets Semaphorin 3a to Mediate TGF-β-induced Endothelial to Mesenchymal Transition: Implication in Atrial Fibrillation

ABSTRACT: MiR-181b Targets Semaphorin 3a to Mediate TGF-β-induced Endothelial to Mesenchymal Transition: Implication in Atrial Fibrillation

PROVIDER: PRJNA659236 | ENA |

REPOSITORIES: ENA

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MiR-181b Targets Semaphorin 3a to Mediate TGF-β-induced Endothelial to Mesenchymal Transition: Implication in Atrial Fibrillation

Project description:Background:This study investigated if and how atrial endothelial cells may transform to mesenchymal cells and contribute to atrial fibrosis via endothelial-to-mesenchymal transition (EndMT). Results:We show a novel mechanistic link between TGF-β1/SMAD signaling and decreased Sema3a expression through the induction of miR-181b; this pathway plays an important role in EndMT associated with the pathogenesis of AF. Both miR-181b and Sema3a are potential therapeutic targets in AF.

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Project description:MiR-181b targets semaphorin 3a to mediate TGF-β-induced endothelial-to-mesenchymal transition related to atrial fibrillation

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myocardial tissue from atrial fibrillation patients

Project description:Electrical and structural remodeling processes are contributors to the self-perpetuating nature of atrial fibrillation (AF). However, their correlation has not been clarified. In this study, human atrial tissues from the patients with rheumatic mitral valve disease in either sinus rhythm or persistent AF were analyzed using a combined transcriptomic and proteomic approach. An up-regulation in chloride intracellular channel (CLIC) 1, 4, 5 and a rise in type IV collagen were revealed. Combined with the results from immunohistochemistry and electron microscope analysis, the distribution of type IV collagen and effects of fibrosis on myocyte membrane indicated the possible interaction between CLIC and type IV collagen, confirmed by protein structure prediction and co-immunoprecipitation. These results indicate that CLICs play an important role in the development of atrial fibrillation and that CLICs and structural type IV collagen may interact on each other to promote the development of AF in rheumatic mitral valve disease.

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