Title:HDAC3 Impairs Cardiac Function in Chronic Heart Failure Rats via
Mediating MicroRNA-26b-3p to Target High Mobility Group
AT-Hook 2
Volume: 30
Issue: 22
Author(s): Xinyuan Han, Shunda Wang, Zhijun Yong, Xueting Zhang, Xuanqi Wang and Chaofeng Sun*
Affiliation:
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an,
710061, Shaanxi, China
Keywords:
Chronic heart failure, histone deacetylase 3, microRNA-26b-3p, high mobility group AT-hook 2, cardiac function, fibrosis.
Abstract:
Background: Histone deacetylase 3 (HDAC3) has been studied in chronic
heart failure (CHF), while the regulatory mechanism of HDAC3 on the development of
CHF in regulating microRNA (miR)-26b-3p/high mobility group AT-hook 2 (HMGA2)
axis has not been extensively investigated. This study aimed to probe the effects of
HDAC3, miR-26b-3p and HMGA2 on CHF.
Methods: CHF rat models were established using aortic coarctation. HDAC3,
miR-26b-3p and HMGA2 levels in CHF rats were examined. Thereafter, the CHF rats
were injected with relative oligonucleotides and plasmids of HDAC3, miR-26b-3p and
HMGA2 to detect the cardiac function, inflammatory reaction, myocardial tissue pathological
changes, and cardiomyocyte apoptosis. The binding relationship between
miR-26b-3p and HMGA2 and the interaction between HDAC3 and miR-26b-3p were
validated.
Results: HDAC3 and HMGA2 were elevated, while miR-26b-3p was decreased in CHF
rats. The reduced HDAC3 or HMGA2 or enriched miR-26b-3p attenuated cardiac dysfunction,
inflammatory reaction, myocardial tissue pathological changes and cardiomyocyte
apoptosis in CHF rats, while the reduction of miR-26b-3p exerted the opposite effects.
Furthermore, the inhibition of the miR-26b-3p or elevation of HMGA2 reversed
the effect of reduced HDAC3 on mitigating CHF progression. Mechanically,
miR-26b-3p targeted HMGA2 and HDAC3 bound to miR-26-3p.
Conclusion: Downregulation of HDAC3 relieves cardiac function in CHF rats via mediating
miR-26b-3p/HMGA2 axis. This study provides novel theory references and a distinct
direction for the therapy strategies of CHF.