Novel genomic targets of valosin-containing protein in protecting pathological cardiac hypertrophy

Area of Science:

• Cardiovascular Biology
• Molecular Mechanisms of Disease
• Genomics and Transcriptomics

Background:

• Pressure overload leads to cardiac hypertrophy, a precursor to heart failure.
• The molecular basis of cardiac protection against hypertrophy is not fully understood.
• Valosin-containing protein (VCP) was previously identified as a protective factor in the heart.

Purpose of the Study:

• To elucidate the molecular mechanisms by which VCP protects the heart from pressure overload.
• To investigate transcriptomic alterations induced by VCP overexpression under cardiac stress.
• To understand VCP's role in preventing pathological cardiac hypertrophy.

Main Methods:

• Utilized a cardiac-specific VCP transgenic mouse model.
• Performed RNA sequencing to analyze transcriptomic changes.
• Conducted comprehensive bioinformatic analysis.

Main Results:

• VCP overexpression normalized pressure overload-stimulated hypertrophic signals.
• Activated G protein-coupled receptors, including olfactory receptors.
• Inhibited transcription factors controlling cell proliferation and differentiation.
• Restored pro-survival signaling by regulating alternative splicing of mitochondrial genes.

Conclusions:

• VCP plays a novel role in regulating cardiac responses to pressure overload.
• VCP-mediated protection involves modulation of GPCRs and transcription factors.
• VCP influences mitochondrial gene splicing to promote cell survival.
• These findings offer new therapeutic insights for hypertensive heart failure.