Genetic and Pharmacological Analyses of Involvement of Src-family, Syk and Btk Tyrosine Kinases in Platelet Shape Change

Markus Bauer; Petra Maschberger; Lynn Quek; Stephen J. Briddon; Debabrata Dash; Michael Weiss; Steve P. Watson; Wolfgang Siess

doi:10.1055/s-0037-1615689

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2001; 85(02): 331-340
DOI: 10.1055/s-0037-1615689

Review Article

Schattauer GmbH

Genetic and Pharmacological Analyses of Involvement of Src-family, Syk and Btk Tyrosine Kinases in Platelet Shape Change

Src-kinases Mediate Integrin α_IIb β₃ Inside-out Signaling during Shape Change

Markus Bauer

¹Institut für Prophylaxe und Epidemiologie der Kreislaufkrankheiten, Klinikum der Universität München, München, Germany

,

Petra Maschberger

¹Institut für Prophylaxe und Epidemiologie der Kreislaufkrankheiten, Klinikum der Universität München, München, Germany

,

Lynn Quek

²Dr. von Haunersches Kinderspital, Klinikum der Universität München, München, Germany;

,

Stephen J. Briddon

²Dr. von Haunersches Kinderspital, Klinikum der Universität München, München, Germany;

,

Debabrata Dash^*

¹Institut für Prophylaxe und Epidemiologie der Kreislaufkrankheiten, Klinikum der Universität München, München, Germany

,

Michael Weiss

³Department of Pharmacology, Oxford University, Oxford, England

,

Steve P. Watson

²Dr. von Haunersches Kinderspital, Klinikum der Universität München, München, Germany;

,

Wolfgang Siess

¹Institut für Prophylaxe und Epidemiologie der Kreislaufkrankheiten, Klinikum der Universität München, München, Germany

› Author Affiliations

Abstract

Summary

Platelet shape change was found to be associated with an increase in protein tyrosine phosphorylation upon stimulation of thrombin-, ADPand thromboxane A₂-G-protein coupled receptors in human platelets and thromboxane A₂ receptors in mouse platelets. By using PP1 and PD173956, two structurally unrelated specific inhibitors of Src-family tyrosine kinases, and mouse platelets deficient in the Src-kinase Fyn or Lyn, we show that Src-family kinases cause the increase in protein tyrosine phosphorylation. We further detected that the non-Src tyrosine kinase Syk was activated during shape change in a manner dependent on Src-family kinaseactivation. The pharmacological experiments and the studies on Fyn-, Lyn- and Syk-deficient mouse platelets showed that neither Src-family kinases nor Syk are functionally involved in shape change. Also human platelets deficient of the tyrosine kinase Btk showed a normal shape change. Binding of PAC-1 that recognizes activated integrin α_IIb β₃ complexes on the platelet surface was enhanced during shape change and blocked by inhibition of Src-kinases. We conclude that the activation of Src-kinases and the subsequent Syk stimulation upon activation of G-protein coupled receptors are not involved in the cytoskeletal changes underlying shape change of human and mouse platelets, but that the stimulation of this evolutionary conserved pathway leads to integrin α_IIb β₃ exposure during shape change.

Keywords

Platelet - shape change - integrin α_IIb β₃ - tyrosine phosphorylation - Src - Syk - Btk - heterotimbric G-protein - ADP - thrombin - thromboxane

Full Text

References

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