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  • Title: Effects of injected antibody against the platelet glycoprotein IIb/IIIa complex on monkey platelet fibrinogen.
    Author: Suzuki M, Kawakatsu T, Nagata H, Hamamoto K, Iwata K, Ohga S, Nomura S, Kokawa T, Yasunaga K.
    Journal: Thromb Haemost; 1992 May 04; 67(5):578-81. PubMed ID: 1519218.
    Abstract:
    Four monkeys were injected for a 10-day period with the Fab fragment of a murine monoclonal antibody (NNKY 1-32) which inhibits the binding of fibrinogen to the platelet glycoprotein (GP) IIb/IIIa complex. Platelet fibrinogen levels were assessed quantitatively by electroimmunoassay and qualitatively by immunoelectron microscopy. The platelet fibrinogen level fell to 9.0 +/- 2.8% of the control level after antibody administration. Immunoelectron microscopy showed that the injected antibody was localized on the inner surface of the platelet alpha-granule membrane. Our findings suggest that the GP IIb/IIIa complex can be internalized by alpha-granules and that it may mediate the endocytosis of plasma fibrinogen by platelets.
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