Summary
The redistribution of platelet glycoproteins (GP) Ib, IIb and IIIa in response to
stimulation with human platelet specific alloantibodies, autoantibodies and a quinidine-dependent
antibody was investigated using immunofluorescence and a quantitative radioimmunoassay.
The platelet GPs carrying the corresponding epitopes were determined using immunoblot
technique or radioimmunoprecipitation. In accordance with previous results obtained
with murine monoclonal platelet specific antibodies, redistribution upon stimulation
with human platelet reactive antibodies was observed only due to reactions with epitopes
on GP IIb, IIIa, respectively, but not on GP Ib. We therefore believe that membrane
redistribution of human platelets induced by various antibodies is a function of the
GP recognized by those antibodies rather than the source of the platelet reactive
antibody.
Keywords
Platelet glycoprotein - Platelet specific antibodies - Redistribution - Endocytosis