MicroR-26b Targets High Mobility Group, AT-hook 2 to Ameliorate Myocardial Infarction-induced Fibrosis by Suppression of Cardiac Fibroblasts Activation.
Curr Neurovasc Res
; 17(2): 204-213, 2020.
Article
in En
| MEDLINE
| ID: mdl-32370714
ABSTRACT
BACKGROUND:
Myocardial Fibrosis (MF) is an important physiological change after myocardial infarction (MI). MicroRNA-26b (MiR-26b) has a certain inhibitory effect on pulmonary fibrosis. However, the role of miR-26b in MI-induced MF rats and underlying molecular mechanisms remain unknown.METHODS:
Forty male Sprague Dawley (SD) rats weighing 200-250 g were divided into four groups (n=10) Sham group, MF group, MF + negative control (NC) agomir group and MF + miR-26b agomir group. Cardiac fibroblasts were isolated from cardiac tissue. Fibrosis levels were detected by MASSON staining, while the expression of related genes was detected by RT-qPCR, Western blotting and Immunohistochemistry, respectively. TargetScan and dual-luciferase reporter assay were utilized to predict the relationship between miR-26b and high mobility group, AT-hook 2 (HMGA2).RESULTS:
The study found the expression of miR-26b to be down-regulated in the myocardium of MF rats (P<0.01). miR-26b overexpression in vitro significantly reduced the survival rate of cardiac fibroblasts and inhibited the expression of the fibrillar-associated protein (α-SMA alphasmooth muscle actin (α-SMA) and collagen I) (P<0.01). TargetScan indicated that HMGA2 was one of the target genes of miR-26b; dual-luciferase reporter assay further confirmed the targeted regulatory relationship (P<0.01). Moreover, miR-26b overexpression significantly reduced the expression of HMGA2 (P<0.01). Notably, HMGA2 overexpression reversed the inhibitory effect of miR-26b overexpression on cardiac fibroblast viability and the expression of α-SMA and collagen I (P<0.01). Animal experiments further indicated that miR-26b overexpression inhibited MIinduced rat MF by inhibiting the expression of HMGA2 (P<0.05, P<0.01).CONCLUSION:
In short, these findings indicate that miR-26b targets HMGA2 to ameliorate MI-induced fibrosis by suppression of cardiac fibroblasts activation.Key words
Full text:
1
Database:
MEDLINE
Main subject:
Fibrosis
/
HMGA2 Protein
/
MicroRNAs
/
Fibroblasts
/
Myocardial Infarction
/
Myocardium
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Curr Neurovasc Res
Journal subject:
ANGIOLOGIA
/
NEUROLOGIA
Year:
2020
Type:
Article
Affiliation country:
China