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Perforin-mediated myocardial damage in acute myocarditis
L H Young1, S V Joag, L M Zheng
1Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston.
Lancet (London, England)
|October 27, 1990
Summary
Cytotoxic T lymphocytes and natural killer cells, identified by perforin, may cause myocardial damage in acute myocarditis. This study investigated the role of these lymphocytes in heart muscle injury during viral and idiopathic myocarditis.
Area of Science:
- Immunology
- Cardiology
- Pathology
Background:
- Acute myocarditis is an inflammatory condition of the heart muscle.
- The precise mechanisms of myocardial damage in acute myocarditis are not fully understood.
- Identifying the immune cells involved is crucial for understanding disease pathogenesis.
Purpose of the Study:
- To investigate the types of immune cells present in the myocardial infiltrate of patients with acute myocarditis.
- To determine the role of cytotoxic lymphocytes and perforin in causing myocardial cell damage.
Main Methods:
- Endomyocardial biopsy specimens were collected from 7 patients with acute myocarditis.
- Immunohistochemical analysis was performed to identify mononuclear infiltrate.
- Electron microscopy was used to examine myocardial cell damage.
Main Results:
- The study identified cytotoxic T lymphocytes and natural killer cells as the predominant immune cells in the myocardial infiltrate.
- Perforin, a cytotoxic protein, was detected within these lymphocytes in the heart tissue.
- Electron microscopy revealed myocardial cell damage potentially linked to these perforin-expressing lymphocytes.
Conclusions:
- Myocardial damage in acute idiopathic and viral myocarditis may result from the action of perforin-secreting cytotoxic lymphocytes.
- These findings highlight the role of cell-mediated cytotoxicity in the pathogenesis of acute myocarditis.
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