© 1999 by European Society of Cardiology
Copyright © 1999, European Society of Cardiology
Myocardial injury leads to a release of heat shock protein (hsp) 60 and a suppression of the anti-hsp65 immune response
aInstitute for Biomedical Aging Research, Austrian Academy of Sciences, Innsbruck, Austria
bDepartment of Internal Medicine, University of Innsbruck, Medical School, Innsbruck, Austria
cInstitute for General and Experimental Pathology, University of Innsbruck, Medical School, Innsbruck, Austria
* Corresponding author. Tel.: +43-512-583-9190; fax: +43-512-583-9198
Objective: While atherosclerosis is associated with high titers of autoantibodies to bacterial hsp65 crossreacting with human hsp60 (anti-hsp60 autoantibodies), myocardial infarction entails decreased humoral immune response to hsp65. We previously hypothesized that myocardial ischemia and subsequent infarction not only induce myocardial hsp60 expression, but also trigger release of myocardial hsp60 into the circulation, influencing the systemic hsp immune response via immune complex formation. Methods: In the present study, organ culture of rat hearts under circulatory arrest provided a model of myocardiocyte injury due to ischemia. Results: Reperfusion of ischemic hearts confirmed the occurrence of myocardial injury by a rise of heart enzymes. Myocardial hsp60 expression was induced up to threefold in response to ischemia, and most of hsp60 expression was localized to the muscle fibers. Analysis of coronary eluate revealed release of hsp60 from myocardium. In addition, hsp60-containing, but not hsp60-free, coronary eluate was recognized by anti-hsp65 serum antibodies and induced proliferation of hsp65-specific T cells. When hsp60-containing coronary eluate was reinjected into an hsp65-primed rat, both humoral and cellular hsp65-immune responses were strongly downregulated. Conclusion: Our findings demonstrate the release of highly immunogenic and crossreactive hsp60 into the circulation in response to myocardial ischemia and myocardiocyte injury.
KEYWORDS Immunology; Infarction; Ischemia; Myocardiocytes; Reperfusion; Heat shock proteins
1 Present adress: Department of Rheumatology, III. Clinic for Internal Medicine of the General University Hospital Vienna, Austria.
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