MicroRNA-135a Regulates Apoptosis Induced by Hydrogen Peroxide in Rat Cardiomyoblast Cells

Area of Science:

• Cardiovascular Biology
• Molecular Biology
• Cell Biology

Background:

• Ischemic heart disease involves oxidative stress and apoptosis.
• MicroRNAs (miRs) are implicated in apoptosis regulation.
• The role of miRs in regulating Bcl-2 during ischemic heart disease is not fully understood.

Purpose of the Study:

• To investigate the role of microRNA-135a (miR-135a) in oxidative stress-induced apoptosis in rat cardiomyoblast cells (H9c2).
• To determine if miR-135a regulates the expression of Bcl-2 protein in this context.
• To explore miR-135a as a potential therapeutic target for ischemic heart disease.

Main Methods:

• H9c2 cells were treated with hydrogen peroxide (H2O2) to induce oxidative stress.
• miR-135a expression levels were analyzed.
• miR-135a was upregulated using mimics and inhibited using inhibitors.
• Cell viability and apoptosis-related proteins, including Bcl-2, were assessed.

Main Results:

• H2O2 treatment significantly upregulated miR-135a expression in H9c2 cells.
• Overexpression of miR-135a reduced Bcl-2 protein levels and enhanced H2O2-induced apoptosis.
• Inhibition of miR-135a restored Bcl-2 expression.
• Bcl-2 knockdown abolished the anti-apoptotic effect of miR-135a inhibition.

Conclusions:

• miR-135a directly targets Bcl-2, mediating apoptosis in H2O2-induced oxidative stress in H9c2 cells.
• miR-135a plays a critical role in the apoptotic pathway during oxidative stress.
• miR-135a represents a potential novel therapeutic target for managing ischemic heart disease.