Title:
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miR-146a targets Fos expression in human cardiac cells
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Author:
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Palomer Tarridas, Francesc Xavier; Capdevila Busquets, Eva; Botteri, Gaia; Davidson, Mercy M; Rodríguez, C.; Martínez González, José; Vidal, Francisco, 1966-; Barroso Fernández, Emma; Chan, Tung O; Feldman, Arthur M; Vázquez Carrera, Manuel
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Other authors:
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Universitat de Barcelona |
Abstract:
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miR-146a is a microRNA whose transcript levels are induced in the heart upon activation of NF-kappaB, a transcription factor induced by pro-inflammatory molecules strongly related to the pathogenesis of cardiac disorders. The main goal of this study consisted in studying new roles of miR-146a in cardiac pathological processes caused by the pro-inflammatory cytokine TNF-alpha. Our results demonstrate that miR-146a transcript levels were sharply increased in cardiac ventricular tissue of transgenic mice with specific overexpression of TNF-alpha in the heart, and also in a cardiomyocyte cell line of human origin (AC16) exposed to TNF-alpha. Among all the in silico predicted miR-146a target genes, c-Fos mRNA and protein levels notably decreased after TNF-alpha treatment or miR-146a overexpression. These changes correlated with a diminution in the DNA-binding activity of AP-1, the c-Fos-containing transcription factor complex. Interestingly, AP-1 inhibition was accompanied by a reduction in matrix metalloproteinase (MMP)-9 mRNA levels in human cardiac cells. The specific regulation of this matrix metalloproteinase by miR-146a was further confirmed at the secretion and enzymatic activity levels, as well as after anti-miR-mediated miR-146a inhibition. The results reported here demonstrate that c-Fos is a direct target of miR-146a activity and that c-Fos/AP-1 pathway downregulation by miR-146a has the capacity to inhibit MMP-9 activity. Given that MMP-9 is an AP-1 target gene involved in cardiac remodeling, myocardial dysfunction and progression of heart failure, these findings suggest that miR-146a may be a new and promising therapeutic tool for treating cardiac disorders associated with enhanced inflammation in the heart. |
Subject(s):
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-Micro RNAs -Cèl·lules -Cor -MicroRNAs -Cells -Heart |
Rights:
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cc-by (c) Palomer Tarridas, Francesc Xavier et al., 2015
http://creativecommons.org/licenses/by/3.0/es |
Document type:
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Article Article - Published version |
Published by:
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The Company of Biologists
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