E2f1 deletion attenuates infarct-induced ventricular remodeling without affecting O-GlcNAcylation

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Post-Translational Modifications

Background:

• Ventricular remodeling is influenced by post-translational modifications like O-linked N-acetylglucosamine (O-GlcNAc).
• The enzymes O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA) regulate O-GlcNAcylation, but their regulation is not fully understood.
• Transcription factor E2F1 has been shown to negatively regulate OGT and OGA expression.

Purpose of the Study:

• To investigate if E2F1 deletion improves post-myocardial infarction (MI) ventricular function by altering OGT and OGA expression.
• To assess the impact of E2F1 ablation on cardiac remodeling and function in a mouse model of MI.

Main Methods:

• Male and female mice underwent non-reperfused myocardial infarction (MI).
• E2F1-ablated and wild-type mice were analyzed at 1 and 4 weeks post-MI.
• Cardiac function, OGT/OGA expression, protein O-GlcNAcylation, and transcriptional profiles were assessed.

Main Results:

• MI significantly increased E2F1 expression.
• E2F1 deletion attenuated cardiac dysfunction at 1 and 4 weeks post-MI.
• E2F1 ablation improved ventricular remodeling, preserved capillary density, and increased cardiomyocyte size, but did not normalize OGT/OGA expression or protein O-GlcNAcylation.

Conclusions:

• E2F1 deletion ameliorates ventricular remodeling and cardiac dysfunction following MI.
• The beneficial effects of E2F1 ablation on cardiac remodeling occur independently of significant changes in OGT and OGA expression.
• E2F1 plays a detrimental role in post-infarct ventricular remodeling.