JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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Deposits of eosinophil granule proteins in cardiac tissues of patients with eosinophilic endomyocardial disease.

Lancet 1987 March 22
Eosinophilic endomyocardial disease is a complication of the hypereosinophilic syndrome and of several other disorders associated with high blood eosinophil counts. Eosinophil granule proteins may be involved in the development of these lesions. This multi-centre study investigated whether these proteins could be demonstrated within the cardiac tissues of eighteen patients with eosinophilic endomyocardial disease. Serial sections of tissue taken at necropsy or at cardiac biopsy were stained for eosinophil major basic protein by indirect immunofluorescence and for eosinophil cationic protein, eosinophil protein-X, and activated eosinophils by means of alkaline-phosphatase-linked monoclonal antibodies. Activated eosinophils and secreted eosinophil granule proteins were most evident within the necrotic and later stage thrombotic lesions and were found mainly within the areas of acute tissue damage in the endocardium and in the walls of small blood vessels. These findings suggest that eosinophil granule proteins are involved in cardiac injury, producing muscle damage and vascular injury which lead to the development of endomyocardial fibrosis.

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