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Updated: Mar 27, 2026
Herbal Munziq Ameliorates Myocardial Ischemia-Reperfusion Injury by Inhibiting Inflammation
Published on: January 10, 2025
Effect and mechanism of miR-126 in myocardial ischemia reperfusion
1Department of Cardiology, Jiangxi Provincial People's Hospital, Donghu District, Nanchang, Jiangxi, China.
Abstract:
Multiple studies have shown microRNAs to play an important role in disease occurrence and development. The role of miRNAs in ischemia-reperfusion injury, however, requires further investigation and the aim of this study was therefore to assess miR-126 expression in myocardial ischemia reperfusion and the effects of miR-126 on myocardial ischemia-reperfusion injury. An in vitro model of ischemia-reperfusion injury was established using rat myocardial H9c2 cells and miR-126 expression in these cells was assessed by real-time PCR. The miR-126 mimic and inhibitor were transfected into H9c2 cells before the injury was induced. Flow cytometry and western blotting were used to assess myocardial cell apoptosis. The triphenyltetrazolium chloride method was used to assess the infarction area and a TUNEL assay was used to analyze myocardial cell apoptosis. The results of the western blot analyses indicate that the miR-126 mimic and inhibitor increase and decrease caspase 3 degradation in myocardial cells, respectively. The in vivo experiments, moreover, revealed that the miR-126 mimic and inhibitor increase and reduce the myocardial infarction area, respectively. The TUNEL assay results showed increases and decreases in apoptotic myocardial cell numbers after infusion with the miR-126 mimic or inhibitor, respectively. These findings indicate that miR-126 is down-regulated in myocardial ischemia-reperfusion injury and that the inhibition of miR-126 may protect against myocardial cell apoptosis caused by ischemia-reperfusion.
Insights
MicroRNA-126 (miR-126) is reduced in myocardial ischemia-reperfusion injury. Inhibiting miR-126 protects against heart cell apoptosis and reduces infarction, suggesting a therapeutic role.
Area of Science:
- Cardiovascular Biology
- Molecular Medicine
- MicroRNA Research
Background:
- MicroRNAs (miRNAs) are crucial regulators in disease pathogenesis.
- The specific role of miRNAs in myocardial ischemia-reperfusion (I/R) injury needs further elucidation.
- miR-126 involvement in cardiac I/R injury is not fully understood.
Purpose of the Study:
- To investigate the expression of miR-126 in myocardial I/R injury.
- To determine the functional impact of miR-126 modulation on cardiac I/R injury.
- To assess the therapeutic potential of targeting miR-126 in myocardial I/R.
Main Methods:
- Established an in vitro model of I/R injury using rat H9c2 cells.
- Assessed miR-126 expression via real-time PCR.
- Utilized miR-126 mimic and inhibitor transfections.
- Quantified apoptosis using flow cytometry and TUNEL assays.
- Evaluated myocardial infarction area using triphenyltetrazolium chloride staining.
- Analyzed caspase 3 degradation via Western blotting.
Main Results:
- miR-126 expression was downregulated in myocardial I/R injury.
- miR-126 mimic transfection increased caspase 3 degradation and apoptosis.
- miR-126 inhibitor transfection decreased caspase 3 degradation and apoptosis.
- In vivo studies showed miR-126 mimic increased infarction area, while inhibitor reduced it.
- Inhibition of miR-126 demonstrably reduced myocardial cell apoptosis.
Conclusions:
- miR-126 is significantly downregulated during myocardial I/R injury.
- Modulating miR-126 levels impacts cardiac cell apoptosis and infarct size.
- Inhibiting miR-126 offers a potential protective strategy against myocardial I/R injury.
