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miR-8485 alleviates the injury of cardiomyocytes through TP53INP1
Xiuying Luo1, Yanlin Xu2, Ze Zhong1
1Department of Cardiology, The Second Affiliated Hospital (Jiande Branch), Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.
Abstract:
MicroRNAs (miRNAs) feature prominently in regulating the progression of chronic heart failure (CHF). This study was performed to investigate the role of miR-8485 in the injury of cardiomyocytes and CHF. It was found that miR-8485 level was markedly reduced in the plasma of CHF patients, compared with the healthy controls. H2 O2 treatment increased tumor necrosis factor-α, interleukin (IL)-6, and IL-1β levels, inhibited the viability of human adult ventricular cardiomyocyte cell line AC16, and increased the apoptosis, while miR-8485 overexpression reversed these effects. Tumor protein p53 inducible nuclear protein 1 (TP53INP1) was identified as a downstream target of miR-8485, and TP53INP1 overexpression weakened the effects of miR-8485 on cell viability, apoptosis, as well as inflammatory responses. Our data suggest that miR-8485 attenuates the injury of cardiomyocytes by targeting TP53INP1, suggesting it is a protective factor against CHF.
Insights
MicroRNA-8485 (miR-8485) is reduced in chronic heart failure (CHF) patients. Overexpressing miR-8485 protects heart cells from injury by targeting TP53INP1, suggesting a therapeutic role in CHF.
Area of Science:
- Cardiology
- Molecular Biology
- Biochemistry
Background:
- MicroRNAs (miRNAs) play a crucial role in regulating chronic heart failure (CHF) progression.
- Understanding specific miRNA roles is vital for developing targeted therapies.
Purpose of the Study:
- To investigate the role of miR-8485 in cardiomyocyte injury and its potential involvement in CHF.
- To elucidate the molecular mechanisms underlying miR-8485's function in cardiac health.
Main Methods:
- Measured miR-8485 levels in plasma from CHF patients and healthy controls.
- Utilized hydrogen peroxide (H₂O₂) to induce cardiomyocyte injury in vitro.
- Assessed cell viability, apoptosis, and inflammatory markers (TNF-α, IL-6, IL-1β).
- Investigated the interaction between miR-8485 and its downstream target, TP53INP1.
Main Results:
- miR-8485 levels were significantly lower in CHF patients compared to controls.
- H₂O₂-induced injury increased inflammatory markers and apoptosis while decreasing cell viability.
- miR-8485 overexpression counteracted these detrimental effects.
- TP53INP1 was identified as a direct target of miR-8485; its overexpression diminished miR-8485's protective effects.
Conclusions:
- miR-8485 exhibits protective effects against cardiomyocyte injury by targeting TP53INP1.
- Reduced miR-8485 levels are associated with CHF.
- miR-8485 represents a potential therapeutic factor for mitigating cardiac damage in CHF.
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