Revisiting miRNA-21 as a Therapeutic Strategy for Myocardial Infarction: A Systematic Review

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Genetic Therapy

Background:

• MicroRNA-21 (miR-21) is expressed in cardiovascular cells and implicated in cardioprotection.
• Myocardial infarction (MI) is a leading cause of cardiac dysfunction.

Purpose of the Study:

• To systematically review the therapeutic effects of miR-21 in myocardial infarction.
• To elucidate the dual roles of miR-21 in post-ischemic cardiac injury.

Main Methods:

• Systematic literature review of published studies on miR-21 and myocardial infarction.
• Analysis of studies reporting miR-21's effects on infarct size, angiogenesis, apoptosis, inflammation, and fibrosis.

Main Results:

• miR-21 demonstrates cardioprotective effects by enhancing angiogenesis, reducing apoptosis, and suppressing inflammation, thereby limiting infarct size.
• miR-21 also promotes tissue fibrosis, potentially exacerbating post-ischemic injury.
• These dual effects stem from miR-21's regulation of multiple genes and signaling pathways (e.g., PTEN, PDCD4).

Conclusions:

• miR-21 exhibits complex, dual functionality in myocardial infarction.
• Understanding these mechanisms is crucial for developing safe and effective miR-21-based genetic therapies for MI.
• Further investigation is warranted to harness the protective aspects of miR-21 while mitigating its fibrotic effects.