Ligand-Binding Assays for Collagen
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Collagen is one of the most physiologically important agonists for platelet function. Two collagen-specific receptors, integrin α2 β1 and glycoprotein (GP) VI, have been identified on the platelet surface from studying patient’s platelets deficient in one of these proteins (1 ,2 ). Integrin α2 β1 was found to be the major receptor responsible for platelet adhesion to collagen (3 ,4 ). The other collagen receptor, GPVI, was indicated to contribute to platelet activation and aggregation by its involvement in collagen-induced signaling pathways (5 ,6 ).
