Journal
JOURNAL OF CELLULAR AND MOLECULAR MEDICINE
Volume 25, Issue 1, Pages 73-83Publisher
WILEY
DOI: 10.1111/jcmm.15814
Keywords
cardiac fibrosis; cardiac remodelling; EGR3; miR‐ 27a; TGF‐ β
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Funding
- Central South University Innovation Fund for Independent Graduate Exploration [72150050587]
- National Nature Science Foundation for the Youth of China [81202005]
- Technology Plan Fund of Hunan Science [2013FJ4109]
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The study shows that miR-27a-5p can attenuate TAC-induced cardiac fibrosis and myofibroblast activation in vivo, while having minimal effect on cardiac myocytes. Molecularly, miR-27a-5p inhibits Tgf-beta signaling and pro-fibrotic protein secretion in cardiac fibroblasts by suppressing the pro-fibrotic transcription factor Egr3.
Pathological myocardial fibrosis and hypertrophy occur due to chronic cardiac stress. The microRNA-27a (miR-27a) regulates collagen production across diverse cell types and organs to inhibit fibrosis and could constitute an important therapeutic avenue. However, its impact on hypertrophy and cardiac remodelling is less well-known. We employed a transverse aortic constriction (TAC) murine model of left ventricular pressure overload to investigate the in vivo effects of genetic miR-27a knockout, antisense inhibition of miR-27a-5p and fibroblast-specific miR-27a knockdown or overexpression. In silico Venn analysis and reporter assays were used to identify miR-27a-5p's targeting of Early Growth Response Protein 3 (Egr3). We evaluated the effects of miR-27a-5p and Egr3 upon transforming growth factor-beta (Tgf-beta) signalling and secretome of cardiac fibroblasts in vitro. miR-27a-5p attenuated TAC-induced cardiac fibrosis and myofibroblast activation in vivo, without a discernible effect on cardiac myocytes. Molecularly, miR-27a-5p inhibited transforming growth factor-beta (Tgf-beta) signalling and pro-fibrotic protein secretion in cardiac fibroblasts in vitro through suppressing the pro-fibrotic transcription factor Early Growth Response Protein 3 (Egr3). This body of work suggests that cardiac fibroblast miR-27a may function as an endogenous anti-fibrotic by negatively regulating Egr3 expression.
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