Different requirement of intracellular calcium and protein kinase C for arachidonic acid release and serotonin secretion in cathepsin G-activated platelets

Serenella Rotondo, Virgilio Evangelista, Stefano Manarini, Giovanni De Gaetano, Chiara Cerletti

Research output: Contribution to journalArticlepeer-review

Abstract

Previous studies have shown that platelet stimulation with cathepsin G rapidly results in cytoplasmic calcium ([Ca2+](i)) increase and activation of protein kinase C (PKC). To elucidate the relationship between these two biochemical events and their relative contribution to the regulation of platelet response to cathepsin G, arachidonic acid (AA) release and serotonin (5HT) secretion were studied. Platelets made Ca2+ depleted and -permeable by treatment with A23187 were compared to intact platelets to better dissociate calcium changes from other receptor-stimulated events. AA release elicited by cathepsin G in intact platelets was prevented by the Ca2+ chelator BAPTA; in Ca2+-depleted, -permeable platelets AA was released in direct response to added Ca2+ and was not increased by simultaneous stimulation with cathepsin G. In intact platelets, PKC inhibition by Ro 31-8220 or PKC induction with PMA either enhanced or reduced, respectively, cathepsin G-induced AA release. Both BAPTA and Ro 31-8220 prevented 5HT secretion from intact platelets; however, in Ca2+-depleted, -permeable platelets, cathepsin G was able to evoke 5HT secretion and p47 phosphorylation independently of [Ca2+](i) increase, both effects being hampered by Ro 31-8220. Ca2+ and PKC therefore regulate PLA2 activity and 5HT secretion in cathepsin G-stimulated platelets in a different manner: the former is mainly triggered by [Ca2+](i) increase, while PKC represents the major factor in determining dense granule secretion.

Original languageEnglish
Pages (from-to)919-925
Number of pages7
JournalThrombosis and Haemostasis
Volume78
Issue number2
Publication statusPublished - Aug 1997

ASJC Scopus subject areas

  • Hematology

Fingerprint

Dive into the research topics of 'Different requirement of intracellular calcium and protein kinase C for arachidonic acid release and serotonin secretion in cathepsin G-activated platelets'. Together they form a unique fingerprint.

Cite this