Update on coxsackievirus B3 myocarditis

Area of Science:

• Immunology
• Cardiovascular Research
• Virology

Background:

• Coxsackievirus B3 (CVB3) is a major cause of viral myocarditis.
• T helper (Th) immune responses play a critical role in the pathogenesis of CVB3 myocarditis.
• Understanding the specific roles of Th1, Th2, and Th17 cells is crucial for disease management.

Purpose of the Study:

• To review recent findings on CVB3 myocarditis pathogenesis.
• To focus on the role of T helper immune responses in disease progression.
• To elucidate the differential effects of Th1, Th2, and Th17 responses.

Main Methods:

• Review of animal models of CVB3 myocarditis.
• Analysis of immune responses, specifically T helper cell subsets.
• Correlation of immune profiles with disease outcomes like myocarditis and dilated cardiomyopathy (DCM).

Main Results:

• Th1 responses reduce viral replication and protect against acute myocarditis.
• Th1 responses also inhibit detrimental Th2 responses, preventing progression to chronic myocarditis and DCM.
• Elevated Th2 responses can promote cardiac remodeling and DCM, despite initial protection against acute inflammation.
• Th17 responses are associated with cardiac remodeling and progression to DCM.

Conclusions:

• Elevated Th2 and Th17 responses are key drivers of progression from myocarditis to DCM and heart failure.
• Th1 responses offer protection by limiting viral replication and suppressing Th2 immunity, though they can exacerbate acute inflammation.
• Modulating T helper cell balance presents a potential therapeutic strategy for CVB3-induced heart disease.