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Studies on the mechanism of ristocetin-induced platelet aggregation

HE Kattlove and MH Gomez

Department of Medicine, Harbor General Hospital, Torrance, Calif. 90509.

Adenine nucleotide metabolism and the release reaction were studied during ristocetin-induced platelet aggregation. Decreasing platelet ATP by incubation with metabolic poisons did not decrease ristocetin- induced aggregation. ADP and ATP were released from platelets during ristocetin-induced aggregation, and ATP was converted to hypoxanthine. However, these occurred after aggregation was almost complete. Aggregation was inhibited by p-choromercuribenzoic acid. By studying platelet suspensions, we were able to determine that this effect was on platelets and not on the plasma cofactor needed for aggregation. We postulate that ristocetin and its cofactor aggregate platelets by binding platelet membranes and that the platelet plays a passive role in this reaction.

Volume 45, Issue 1, pp. 91-96, 01/01/1975
Copyright © 1975 by The American Society of Hematology


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  Copyright © 1975 by American Society of Hematology         Online ISSN: 1528-0020