Abstract
This study was done to examine the nature of the membrane constituents involved in the secretion of eosinophil cationic protein (ECP) from human blood eosinophils. Three mouse monoclonal antibodies were used, which showed greater binding to membrane antigens on activated, and light density eosinophils from patients with an eosinophilia, than on nonactivated or normal density eosinophils. All three antibodies (EoN4, EoN5 & EoN6) stimulated normal density human eosinophils to secrete ECP, either alone or in association with sepharose-C3b. The antibodies bound to at least two separate sites on the membrane, which were distinct from the receptors for immunoglobulins, C3b, and eosinophil activating factor. One combination of antibodies increased the amount of ECP which was secreted. The membrane antigen recognized by antibody EoN4 was a glycoprotein, molecular weight 75 kD. These findings showed that ECP secretion may be induced by a wider range of stimuli than has been previously recognized, and that the antigens recognized by these monoclonal antibodies may play an important role in the induction of eosinophil degranulation.
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