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pubmed-article:1331556pubmed:abstractTextCell-mediated autoimmunity has been strongly implicated in the pathogenesis of the myocardial cell damage involved in viral myocarditis. To investigate the cellular and molecular bases of both target cells and effector cells for cell-mediated cytotoxicity involved in viral myocarditis and dilated cardiomyopathy, we first examined the expression of major histocompatibility complex (MHC) antigens and a cell adhesion molecule, intercellular adhesion molecule-1 (ICAM-1) in myocardial cells of a murine model of viral myocarditis and in patients with acute myocarditis and dilated cardiomyopathy. Secondly, we analyzed the characteristics of the infiltrating cells in the heart, especially the expression of a cytolytic factor, perforin. We found that Coxsackievirus B3 (CVB3)-induced murine acute myocarditis resulted in enhanced expression of MHC (class I) antigens and ICAM-1 on myocardial cells, and that perforin was abundantly expressed in NK (natural killer)-like large granular lymphocytes (LGL), which represent the main infiltrating cell type in the early stage. Immunoelectron microscopic study showed killer cells directly damaging cardiac myocytes by the release of perforin. Perforin was also expressed in the infiltrating cells in the heart of a patient with acute myocarditis. Both MHC antigens and ICAM-1 were clearly expressed in the hearts of patients with acute myocarditis and dilated cardiomyopathy. These data provided direct evidence that cell-mediated cytotoxicity plays a critical role in the myocardial cell damage involved in viral myocarditis.lld:pubmed
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pubmed-article:1331556pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:1331556pubmed:articleTitleCellular and molecular bases for the immunopathology of the myocardial cell damage involved in acute viral myocarditis with special reference to dilated cardiomyopathy.lld:pubmed
pubmed-article:1331556pubmed:affiliationThird Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.lld:pubmed
pubmed-article:1331556pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1331556pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed