Activation of platelets by eosinophil granule proteins

doi:10.1084/jem.172.4.1271

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Activation of platelets by eosinophil granule proteins

MS Rohrbach, CL Wheatley, NR Slifman and GJ Gleich
Department of Medicine, Mayo Clinic, Rochester, Minnesota 55905.

Two of the four principal cationic proteins of the eosinophil granule, major basic protein (MBP) and eosinophil peroxidase (EPO), were shown to be platelet agonists. Both MBP and EPO evoked a dose-dependent nonlytic secretion of platelet 5-hydroxytryptamine in unstirred platelet suspensions even in the presence of 10 microM indomethacin. MBP also evoked secretion of platelet alpha granule and lysosome components. Secretion by MBP and EPO was inhibited by 1 microM PGE1, but the nature of the inhibition differed from that observed with thrombin. Thus, MBP and EPO can be classified as strong platelet agonists with a distinct mechanism of activation.
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