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. 1990 Jan 15;265(2):343–349. doi: 10.1042/bj2650343

How does fluoroaluminate activate human platelets?

F Rendu 1, M Lebret 1, D Tenza 1, S Levy-Toledano 1
PMCID: PMC1136893  PMID: 2302176

Abstract

Platelet activation induced by NaF or fluoroaluminate (AlF4-) was studied. The latter has been described to substitute for the gamma-phosphate group of the GTP molecule. With 10 mM-NaF, a concentration unable to induce any measurable Ca2+ mobilization (as measured with Indo 1), addition of AlCl3 potentiated platelet aggregation, thromboxane synthesis, diacylglycerol formation and p43 phosphorylation, without any increase in intracellular Ca2+. Neither phosphoinositide hydrolysis nor phosphatidic acid formation could be detected. AlF4- induced the release through a granule centralization within a microtubule bundle, although no myosin light-chain phosphorylation could be detected. Addition of flurbiprofen (10 microM) resulted in only partial inhibition of diacylglycerol formation, with no effect on the release reaction or on p43 phosphorylation. The present results suggest that AlF4- does not stimulate a G-protein governing the phosphoinositide-specific phospholipase C. The AlF4(-)-induced diacylglycerol formation is discussed. Moreover, these results bring evidence that there is no correlation between granule centralization and myosin light-chain phosphorylation.

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