Tyrosine phosphorylation / dephosphorylation balance is involved in thrombin-evoked microtubular reorganisation in human platelets

Aicha Bouaziz; Nidhal Ben Amor; Geoffrey E. Woodard; Hanen Zibidi; José J. López; Ahgleb Bartegi; Ginés M. Salido; Juan A. Rosado

doi:10.1160/TH07-01-0061

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2007; 98(02): 375-384
DOI: 10.1160/TH07-01-0061

Platelets and Blood Cells

Schattauer GmbH

Tyrosine phosphorylation / dephosphorylation balance is involved in thrombin-evoked microtubular reorganisation in human platelets

Aicha Bouaziz

¹Unité de Recherche de Biochimie, Inst. Superieur de Biotechnologie, Monastir, Tunisia

,

Nidhal Ben Amor

¹Unité de Recherche de Biochimie, Inst. Superieur de Biotechnologie, Monastir, Tunisia

,

Geoffrey E. Woodard

²National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA

,

Hanen Zibidi

¹Unité de Recherche de Biochimie, Inst. Superieur de Biotechnologie, Monastir, Tunisia

,

José J. López

³Department of Physiology (Cell Physiology Research Group), University of Extremadura, Cceres, Spain

,

Ahgleb Bartegi

¹Unité de Recherche de Biochimie, Inst. Superieur de Biotechnologie, Monastir, Tunisia

,

Ginés M. Salido

³Department of Physiology (Cell Physiology Research Group), University of Extremadura, Cceres, Spain

,

Juan A. Rosado

³Department of Physiology (Cell Physiology Research Group), University of Extremadura, Cceres, Spain

› Author Affiliations

Abstract

Summary

We have investigated the intracellular mechanisms involved in microtubular remodelling by thrombin and its possible involvement in platelet aggregation and secretion. Platelet stimulation with thrombin induces a time- and concentration-dependent regulation of the microtubular content, which was found to be maximally effective at the concentration 0.1 U/ml. Thrombin (0.1 U/ml) evoked an initial decrease in the microtubule content detectable at 5 seconds (sec) and reached a minimum 10 sec after stimulation.The microtubular content then increased, exceeding basal levels again approximately 30 sec after stimulation. Inhibition of tyrosine phosphatases using vanadate abolished thrombin-induced microtubular depolymerisation while inhibition of tyrosine kinases by methyl-2,5-dihydroxycinnamate prevented microtubule polymerisation.Thrombin activates the cytosolic Brutons tyrosine kinase (Btk) and Src proteins. Inhibition of Btk or Src by LFM-A13 or PP1, respectively, abolished thrombin-induced microtubular polymerisation, while maintaining intact its ability to induce initial depolymerisation. Microtubular disruption by colchicine significantly reduced thrombin induced platelet aggregation and ATP secretion. Similar results were observed after inhibition of microtubular disassembly by paclitaxel.These findings indicate that thrombin induces microtubular remodelling by modifying the balance between protein tyrosine phosphorylation and dephosphorylation. The former seems to be required for microtubular polymerisation, while tyrosine dephosphorylation is required for microtubular depolymerisation. Both, initial microtubular disassembly and subsequent polymerisation are required for thrombin-induced platelet aggregation and secretion in human platelets.

Keywords

Thrombin - microtubules - aggregation - platelets - pp60^src - Btk - protein kinases - protein phosphatases - ATP

Full Text

References

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