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Noninvasive Assessment of Cardiac Abnormalities in Experimental Autoimmune Myocarditis by Magnetic Resonance Microscopy Imaging in the Mouse
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Studies on the pathogenesis of atrial myocarditis in mice infected with Coxsackie virus B3

I Hashimoto, A Hagiwara

    British Journal of Experimental Pathology
    |February 1, 1986
    PubMed

    Insights

    Coxsackie virus B3 (CB3) causes both atrial and ventricular myocarditis in mice. Direct viral action on the atrial myocardium leads to inflammation and damage, similar to ventricular effects.

    Area of Science:

    • Virology
    • Cardiovascular Pathology
    • Immunology

    Background:

    • Coxsackie virus B3 (CB3) is a known cause of myocarditis.
    • The specific mechanisms of atrial myocarditis by CB3 are not fully understood.
    • Distinguishing primary viral effects from secondary inflammation is crucial.

    Purpose of the Study:

    • To investigate whether atrial myocarditis is a direct result of CB3 replication in the atria.
    • To compare the histopathological changes in atrial and ventricular myocarditis induced by CB3.
    • To determine the role of direct viral action in atrial myocardial damage.

    Main Methods:

    • Intraperitoneal inoculation of BALB/c mice with Coxsackie virus B3 (CB3).
    • Histopathological examination of atrial and ventricular myocardium for lesions and inflammation.
    • Virus titration and immunofluorescent detection of viral antigen in myocardial tissues.

    Main Results:

    • CB3 induced histopathological changes in both atrial (67%) and ventricular (71%) myocarditis.
    • Lesions included degeneration, necrosis, and mononuclear cell infiltration in both atria and ventricles.
    • High virus titers and detectable viral antigen in atrial myocardium confirmed direct viral infection.

    Conclusions:

    • Coxsackie virus B3 directly causes atrial myocarditis.
    • Atrial myocardial damage is due to the direct action of the virus, not secondary to ventricular inflammation.
    • CB3 is capable of infecting and damaging both atrial and ventricular heart tissues.

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