Pathophysiological Mechanisms of Cardiac Dysfunction in Transgenic Mice with Viral Myocarditis

Area of Science:

• Cardiology
• Virology
• Molecular Biology

Background:

• Viral myocarditis is linked to RNA viruses, including coxsackievirus B3 (CVB3) and SARS-CoV-2.
• Current treatments for viral myocarditis remain limited despite extensive research.

Purpose of the Study:

• To investigate virus-mediated cardiac pathophysiological processes in vivo and in vitro.
• To elucidate the mechanisms underlying viral myocarditis using a novel transgenic mouse model.

Main Methods:

• Utilized a transgenic mouse strain (TG) harboring a CVB3ΔVP0 genome.
• Performed in vivo and in vitro analyses of cardiac function, ECG, calcium homeostasis, and gene expression.
• Examined mitochondrial structure and gene expression profiles.

Main Results:

• Transgenic mice exhibited significant alterations in cardiac function, ECG, calcium homeostasis, and gene expression.
• Mitochondrial structure and gene expression were markedly altered, indicating impaired mitochondrial function.
• These changes suggest mitochondrial dysfunction contributes to cardiac contractile dysfunction in viral myocarditis.

Conclusions:

• The study provides an in-depth understanding of virus-induced cardiac pathology.
• Findings suggest mitochondrial impairment is a critical factor in viral myocarditis progression.
• This research may inform the development of novel therapeutic strategies for viral myocarditis and heart failure.