Ionomycin-stimulated arachidonic acid release in human platelets: a role for protein kinase C and tyrosine phosphorylation.

Abstract:

:Collagen (10-90 micrograms/ml) and ionomycin (1 microM; a calcium ionophore) each evoked rises in intracellular free calcium, protein kinase C activity and arachidonic acid release in human platelets, and as previously demonstrated for collagen, ionomycin (1 microM) stimulated protein tyrosine phosphorylation. However, at lower concentrations (60 and 250 nM) ionomycin selectively mobilised calcium. Ro31-8220 (a selective inhibitor of protein kinase C) inhibited (by 50%) ionomycin-stimulated arachidonic acid release. Genistein (an inhibitor of protein tyrosine kinases) also reduced by 50% ionomycin-stimulated arachidonic acid release. In combination, genistein and Ro31-8220 abolished ionomycin-stimulated arachidonic acid release. These findings show 1) that a rise in calcium is not sufficient, and 2) the activation of both protein kinase C and protein tyrosine phosphorylation is necessary, for full ionomycin-stimulated arachidonic acid release in human platelets.

journal_name

Thromb Haemost

authors

Hargreaves PG,Jenner S,Merritt JE,Sage SO,Farndale RW

subject

Has Abstract

pub_date

1996-08-01 00:00:00

pages

248-52

issue

2

eissn

0340-6245

issn

2567-689X

journal_volume

76

pub_type

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