miRNA-145-5p induces apoptosis after ischemia-reperfusion by targeting dual specificity phosphatase 6

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Cellular Pathology

Background:

• Ischemia-reperfusion (I/R) injury, a major cause of stroke and myocardial infarction, leads to severe health issues and mortality.
• MicroRNAs (miRNAs) are increasingly recognized as key regulators of cellular responses during ischemic pathology.
• Understanding the specific roles of miRNAs in I/R injury is crucial for developing effective therapeutic strategies.

Purpose of the Study:

• To investigate the role of microRNA-145-5p (miR-145-5p) in regulating myocardial ischemic injury.
• To elucidate the molecular mechanisms by which miR-145-5p influences cardiomyocyte apoptosis and I/R damage.
• To identify potential therapeutic targets based on the miR-145-5p/DUSP6 axis in I/R.

Main Methods:

• Establishment of I/R models in rat cardiomyocytes (H9C2) and in vivo rat models.
• Analysis of protein expression using Western blot and quantitative polymerase chain reaction (qPCR).
• Assessment of cardiomyocyte apoptosis via Annexin V-FITC/PI staining and investigation of miRNA-target interaction using luciferase reporter assays.

Main Results:

• miR-145-5p was found to promote apoptosis in cardiomyocytes subjected to I/R conditions.
• miR-145-5p was demonstrated to directly inhibit the expression of dual specificity phosphatase 6 (DUSP6).
• DUSP6 exhibited protective effects against I/R injury by suppressing the c-Jun N-terminal kinase (JNK) pathway.

Conclusions:

• miR-145-5p plays a significant role in exacerbating myocardial ischemic injury by inducing apoptosis.
• The miR-145-5p/DUSP6 interaction is a critical pathway in the pathogenesis of I/R injury.
• Targeting miR-145-5p or modulating DUSP6 levels presents a promising therapeutic avenue for I/R-related disorders.