MicroRNA-451a attenuates angiotensin IIinduced cardiac fibrosis and inflammation by directly targeting T-box1
J. physiol. biochem
; 78(1): 257-269, feb. 2022.
Artigo
em Inglês
| IBECS
| ID: ibc-215887
Biblioteca responsável:
ES1.1
Localização: ES15.1 - BNCS
ABSTRACT
Hypertension or angiotensin II (Ang II) induces cardiac inflammation and fibrosis, thus contributing to cardiac remodeling. MicroRNAs (miRNAs) are considered crucial regulators of cardiac homeostasis and remodeling in response to various types of stress. It has been reported that miR-451a is involved in regulating ischemic heart injury. However, its role in Ang II-induced cardiac fibrosis remains unknown. Cardiac remodeling was induced in mice by infusion of low-dose Ang II (490 ng/kg/min) with a minipump for 2 weeks. Echocardiography and histological examinations were performed to evaluate cardiac function and pathological changes. We observed that miR-451a expression was the most significantly downregulated in the hearts of Ang II-infused mice and in both primary cardiac myocytes and fibroblasts. Overexpression of miR-451a in mice significantly attenuated Ang IIinduced cardiac fibrosis and inflammation. Conversely, knockdown of miR-451a in mice aggravated this effect. Bioinformatics analysis and a luciferase reporter assay revealed that TBX1 was a direct target of miR-451a. Mechanistically, miR-451a directly targeted TBX1 expression, which inhibited TGF-β1 production in both cardiac myocytes and fibroblasts, inactivating of TGF-β1/SMAD2/3 signaling, inhibiting myofibroblast differentiation and proinflammatory cytokine expression, and leading to attenuation of cardiac fibrosis and inflammation. In conclusion, these results indicate that miR-451a acts as a novel regulator of Ang IIinduced cardiac fibrosis and inflammation by directly targeting TBX1, and may be a promising therapeutic target for treating hypertensive cardiac diseases. (AU)
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Espanha
Base de dados:
IBECS
Assunto principal:
Angiotensina II
/
MicroRNAs
Limite:
Animais
Idioma:
Inglês
Revista:
J. physiol. biochem
Ano de publicação:
2022
Tipo de documento:
Artigo
Instituição/País de afiliação:
Capital Medical University/China
/
Dalian Medical University/China
/
First Affiliated Hospital of Dalian Medical University/China