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The Korean Journal of Pathology 1995;29(2): 212-220.
Expression of Interleukin-6 in Induced Viral Myocarditis in Mice.
Soo Yeon Cho, Hye Kyung Jin, Min Sun Cho, Sung Sook Kim, Woon Sup Han, Dong Sun Han, Hak Chung Lee
1Department of Pathology, College of Medicine, Ewha Womans University, Seoul, Korea.
2Department of Internal Medicine, School of Medicine, Dan Kuk University, Seoul, Korea.
ABSTRACT
Viral myocarditis is considered an important cause of dilated cardiomyopathy. At preseent, two mechanisms are known to be involved in the pathogenesis of viral myocarditis and subse-quent cardiomyopathy: viral direct toxicity and immune mediated toxicity. Some authors have reported that IL-6 influences the immunologic mechanism and the virus-induced tissue damage in myocarditis. We injected encephalomyocarditis(EMC) virus to induce viral myocarditis in ICR mice. In order to study the lymphocyte subset and IL-6 expression to clarify the immune mechanism and to demonstrate the role of IL-6 in viral induced myocardial damage. The following results were obtained: 1) In virus inoculated mice, inflammation was severest at 10 days, and some serious complications developed, indicating a possible transition to dilated cardiomyopathy. 2) On analysis of the lymphocyte subset, CD4 cells were most prevalent at 5 days and CD8 cells were most prevalent at 10 and 20 days. 3) IL-6 was significantly increased and expression of IL-6 was constant, but its intensity was strongest at 5 days. In conclusion, IL-6, produced by inflammatory cells, fibroblasts, and endothelial cells, might play an important role in myocardial damage in experimentally induced EMC viral myocarditis by its direct cytotoxicity or cytokine mediated activation of cytotoxic cells.
Key Words: Viral myocarditis; Interleukin-6; Immunohistochemistry