Tyrosine phosphorylation and the small GTPase rac cross-talk in regulation of endothelial barrier function

Jochen Seebach; Hans-Jürgen Mädler; Beata Wojciak-Stothard; Hans-Joachim Schnittler

doi:10.1160/TH05-01-0015

Thrombosis and Haemostasis, Inhaltsverzeichnis

Thromb Haemost 2005; 94(03): 620-629
DOI: 10.1160/TH05-01-0015

Cell Signalling and Vessel Remodelling

Schattauer GmbH

Tyrosine phosphorylation and the small GTPase rac cross-talk in regulation of endothelial barrier function

Authors

Jochen Seebach

¹Institut of Physiology, TU-Dresden, Dresden, Germany
Hans-Jürgen Mädler

¹Institut of Physiology, TU-Dresden, Dresden, Germany
Beata Wojciak-Stothard

²Rayne Institute UCL, London, UK
Hans-Joachim Schnittler

¹Institut of Physiology, TU-Dresden, Dresden, Germany

Abstract

Summary

Endothelial barrier function depends on the integrity of intercellular adherens junctions controlled by the association of VEcadherin/ catenin complex with cortical actin filaments. Both tyrosine phosphorylation/dephosphorylation of junctional proteins and actin reorganization mediated by rho-GTPases regulate barrier function but the relationship between these regulatory mechanisms is unclear. Here we studied the effects of factors increasing protein tyrosine phosphorylation, pervanadate (PV) and VEGF, on distribution of VE-cadherin, F-actin polymerization and transendothelial electrical resistance (TER) in human umbilical vein endothelial cells (HUVECs). Changes in protein tyrosine phosphorylation of cytoplasmic and junctional proteins, as well as the activity of rho-GTPase rac1, were also measured. We report for the first time that PV and VEGF induced a rapid transient increase in endothelial barrier function accompanied by rac1 activation, a differentiated tyrosine phosphorylation of theVE-cadherin/catenin complex, recruitment of actin filament to cell junctions and ruffle formation. A sustained decrease in endothelial barrier function was observed at later times of PV and VEGF treatment. Expression of dominant negative rac1, N17rac1 abolished the barrier-enhancing effects of PV andVEGF, while the sustained decrease in barrier function was unaffected. These observations bring into focus early shortterm effects of protein tyrosine phosphorylation in cells, often overshadowed by more pronounced and long-lasting later effects and may play an important role in the regulation of endothelial barrier function.

Keywords

VE-cadherin - catenin - actin - VEGF - pervanadate

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