Abstract
The involvement of glycoprotein (GP) IIb-IIIa (αIIbβ3-integrin) in the stimulation of secretion from platelet dense and α-granules was investigated. Fibrinogen binding with GP IIb-IIIa and platelet aggregation were inhibited by fragments of anti-GP IIb-IIIa monoclonal antibodies (monAB)—Fab fragment of antibody c7E3 (preparation ReoPro) and F(ab")2 fragment of antibody FraMon (preparation FRAMON). Suppression of GP IIb-IIIa receptor activity by both preparations led to 100% inhibition of [14C]serotonin secretion from dense granules upon platelet activation with ADP, to partial inhibition upon activation with thromboxane A2 analog U46619 (by 60-70%) and thrombin at 0.1 U/ml (by 40-50%), but did not decrease serotonin secretion induced by thrombin at 1 U/ml. ReoPro and FRAMON completely inhibited ADP-induced release of soluble P-selectin from platelet α-granules, but did not influence P-selectin secretion stimulated by U46619 and by both thrombin concentrations. MonAB CRC54 against GP IIb-IIIa, which induced its interaction with fibrinogen and platelet aggregation, also stimulated serotonin and P-selectin secretion. Both types of release reactions were completely suppressed by ReoPro and FRAMON. Aspirin, the cyclooxygenase inhibitor, also prevented CRC54-induced secretion, proving the dependence of this process on thromboxane A2 synthesis. Upon platelet activation by concanavalin A (Con A), caused by clusterization of membrane glycoproteins, GP IIb-IIIa blockade only slightly (by 15-20%) decreased serotonin secretion. High level of Con A-induced secretion was also detected in a patient with hereditary deficiency of GP IIb-IIIa. Thus, neither clusterization nor occupation of GP IIb-IIIa are essential for the stimulation of Con A-induced release reaction. The data indicate that GP IIb-IIIa binding with fibrinogen leads to the stimulation of secretion from platelet granules. When the level of secretion does not depend on GP IIb-IIIa interaction with the ligands or its presence on platelets full-scale release reaction is presumably stimulated by activating signals formed without GP IIb-IIIa involvement.
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Naimushin, Y.A., Mazurov, A.V. Role of Glycoprotein IIb-IIIa (αIIbβ3-integrin) in Stimulation of Secretion from Platelet Granules. Biochemistry (Moscow) 68, 209–216 (2003). https://doi.org/10.1023/A:1022605613859
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DOI: https://doi.org/10.1023/A:1022605613859