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• W313591341 abstract "Abstract The platelet retention test provides a measure of the number of platelets retained in a column of glass beads and is one of the few in vitro platelet function tests that is abnormal in von Willebrand's disease (vWd). In a two-stage test, 1 mL of blood (designated A) was passed through the column, followed by 5 mL of isotonic saline and then 5 mL of blood (B) in which platelet retention was measured. With normal blood as A and B, retention is very high in all 5 mL of blood B. In the first stage, platelets adhere to the glass beads; this requires fibrinogen but not von Willebrand factor (vWf). The platelet-platelet adhesion in the second stage requires vWf, is dependent on release of ADP, and fails to occur if thrombasthenic platelets are tested. Retention was normal when blood from a patient with afibrinogenemia was used as blood B. We have now used monoclonal antibodies to elucidate further the mechanism of platelet retention. Five antibodies to different epitopes on vWf essentially abolished retention in the one- stage test and in the second stage of the two-stage test, but had no effect on the first stage. Thus, the entire vWf molecule must be free of antibody to function in the platelet-platelet adhesion of the second stage of this test. Binding of the antigen-antibody complex to the platelet Fc receptor was not responsible, as Fab and F(ab')2 fragments of one of the antibodies were as effective as intact antibody, and as neither heat-aggregated IgG nor a polyclonal antibody to plasma factor IX inhibited retention. F(ab')2 fragments of 6D1, an antibody to platelet GP Ib that prevents binding of vWf to platelets, also inhibited the second phase of retention. An antibody that inhibits binding of fibrinogen and vWf to GP IIb/IIIa (LJ-CP8) inhibited both the first and second stages of retention, whereas LJ-P5, an antibody that inhibits only the binding of vWf to GP IIb/IIIa, caused slight inhibition of retention when normal or afibrinogenemic blood was used as blood B and was reported to cause only partial inhibition of ADP- induced platelet aggregation in this afibrinogenemic patient. The results suggest that vWf is altered during rapid passage of blood through the glass-bead column so that it attaches to GP Ib, exposing GP IIb/IIIa, which then binds the altered vWf or fibrinogen, either of which can induce platelet aggregation (platelet-platelet adhesion) and thus retention in the column." @default.
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• W313591341 date "1987-08-01" @default.
• W313591341 modified "2023-10-03" @default.
• W313591341 title "Effect of monoclonal antibodies against von Willebrand factor and platelet glycoproteins IIb/IIIa on the platelet retention test" @default.
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• W313591341 doi "https://doi.org/10.1182/blood.v70.2.546.546" @default.
• W313591341 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3496929" @default.
• W313591341 hasPublicationYear "1987" @default.
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