Circular RNA (circRNA) CDYL Induces Myocardial Regeneration by ceRNA After Myocardial Infarction

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• RNA Biology

Background:

• Acute myocardial infarction (AMI) poses a significant threat to cardiovascular health.
• Understanding the molecular mechanisms underlying cardiac repair after AMI is crucial.
• Circular RNAs (circRNAs) are emerging as key regulators in various biological processes, including cardiac function.

Purpose of the Study:

• To investigate the role of circRNA CDYL in myocardial angiogenesis following AMI.
• To elucidate the molecular pathway through which circRNA CDYL influences cardiac function and cardiomyocyte proliferation.

Main Methods:

• Establishment of a myocardial infarction mouse model to compare circRNA CDYL levels and angiogenesis in infarcted versus normal heart tissue.
• In silico prediction of downstream microRNA (miRNA) targets using the RegRNA database.
• In vitro gain-of-function and loss-of-function experiments to assess the impact of circRNA CDYL on cardiomyocyte proliferation and heart function.
• Investigation of the interaction between circRNA CDYL, miR-4793-5p, and APP expression.

Main Results:

• CircRNA CDYL expression was found to be downregulated in myocardial tissues and hypoxic cardiomyocytes after AMI.
• Overexpression of circRNA CDYL improved cardiac function and promoted cardiomyocyte proliferation in vitro, while its downregulation had the opposite effect.
• CircRNA CDYL was identified as a molecular sponge for miR-4793-5p, regulating its expression.
• The miR-4793-5p/APP pathway was implicated in the regulation of cardiomyocyte proliferation by circRNA CDYL.

Conclusions:

• CircRNA CDYL plays a protective role in the recovery from acute myocardial infarction.
• CircRNA CDYL promotes cardiomyocyte proliferation and improves cardiac function post-AMI.
• The mechanism involves the circRNA CDYL/miR-4793-5p/APP axis, highlighting a novel therapeutic target for cardiovascular diseases.