This is exactly what happens in acute, fulminant viral myocarditis. Cytokines play a role in the development of DCM following the infection.
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Direct viral injury — Our understanding of the pathogenesis of viral myocarditis comes almost entirely from experimental models of acute coxsackie B virus infection [75]. The initial change is myocyte damage in the absence of a cellular immune response. The myocyte injury may be mediated through direct viral toxicity, perforin-mediated cell lysis, and cytokine expression [76].
Intracellular events — Viral entry into the myocyte is mediated by cell surface receptors. The coxsackie-adenovirus receptor (CAR) is a common receptor for coxsackievirus type B and for adenovirus subgroups A, C, D, E, and F [77-79]. The CAR gene has been localized to chromosome 21q11.2 [80]. With rare exceptions, CAR expression is required for virus entry into cells. Observations have established the role for a dominant negative C terminal dystrophin fragment in viral cardiomyopathy and added a new pathway and potential therapeutic target in viral myocarditis [81].
The discovery of the CAR receptor raises the possibility of interventional therapy to block CAR in severe cases of coxsackie B virus or adenoviral myocarditis. Coreceptors, including decay-accelerating factor (DAF, CD55) for some coxsackie B virus strains [82] and integrins, help determine the efficiency of infection [83,84]. The activity of signaling pathways in cardiac myocytes also may determine susceptibility to coxsackie B myocarditis via effects on viral replication [85].
After entry into the cell through the CAR receptor, the coxsackie B viral genome is translated into structural capsid proteins and several proteases that cleave the viral polyprotein. Viral protease 2A can also cleave certain host proteins, and one mechanism of ongoing myocyte injury is through direct interaction of viral proteins with the cytoskeleton. In a transgenic mouse model, cardiac-restricted expression of protease 2A was sufficient to induce dilated cardiomyopathy [86].
Protease 2A cleaves dystrophin in vivo, leading to disruption of the dystrophin-glycoprotein complex that is essential for normal cardiac function [87]. Disruption of the dystrophin-glycoprotein complex is also present in hereditary cardiomyopathies that are related to a dystrophin mutation, such as Duchenne muscular dystrophy [88] (see "Duchenne and Becker muscular dystrophy: Clinical features and diagnosis"). There is more efficient release of the coxsackie B virus from dystrophin-deficient cells [89]. Thus, dystrophin-deficient mice have greater viral replication and more severe cardiomyopathy.
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