miR-1/miR-206 regulate Hsp60 expression contributing to glucose-mediated apoptosis in cardiomyocytes

Area of Science:

• Cardiology
• Molecular Biology
• Diabetology

Background:

• Heat Shock Protein 60 (Hsp60) is crucial for defense against diabetic myocardial injury.
• The reasons for reduced Hsp60 levels in diabetic heart tissue are not fully understood.

Purpose of the Study:

• To investigate the role of microRNAs, specifically miR-1 and miR-206, in the regulation of Hsp60 expression under high glucose conditions.
• To elucidate the mechanism by which these microRNAs affect Hsp60 and contribute to cardiomyocyte apoptosis in diabetes.

Main Methods:

• Stimulation of cardiomyocytes with high glucose in both in vivo and in vitro models.
• Analysis of miR-1, miR-206, and Hsp60 expression levels.
• Investigation of the involvement of Serum Response Factor (SRF) and the MEK1/2 pathway.
• Assessment of cardiomyocyte apoptosis.

Main Results:

• High glucose significantly up-regulated miR-1 and miR-206 expression in cardiomyocytes.
• miR-1 and miR-206 were found to post-transcriptionally modulate Hsp60 expression.
• The SRF and MEK1/2 pathways were implicated in the regulation of miR-1 and miR-206.
• Increased miR-1 and miR-206 accelerated cardiomyocyte apoptosis by affecting Hsp60.

Conclusions:

• miR-1 and miR-206 play a key role in regulating Hsp60 expression in cardiomyocytes.
• These microRNAs contribute to high glucose-induced apoptosis in the diabetic heart.
• The findings identify a novel molecular pathway involved in diabetic myocardial injury.