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2005 ; 19
(6
): 512-20
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Platelet-activating factor increases VE-cadherin tyrosine phosphorylation in
mouse endothelial cells and its association with the PtdIns3 -kinase
#MMPMID15791001
Hudry-Clergeon H
; Stengel D
; Ninio E
; Vilgrain I
FASEB J
2005[Apr]; 19
(6
): 512-20
PMID15791001
show ga
Platelet-activating factor (PAF), a potent inflammatory mediator, is involved in
endothelial permeability. This study was designed to characterize PAF receptor
(PAF-R) expression and its specific contribution to the modifications of adherens
junctions in mouse endothelial cells. We demonstrated that PAF-R was expressed in
mouse endothelial cells and was functionally active in stimulating p42/p44 MAPK
and phosphatidylinositol 3-kinase (PtdIns3'-kinase)/Akt activities. Treatment of
cells with PAF induced a rapid time- and dose-dependent (10(-7) to 10(-10) M)
increase in tyrosine phosphorylation of a subset of proteins ranging from 90 to
220 kDa, including the VE-cadherin, the latter effect being prevented by the
tyrosine kinase inhibitors herbimycin A and bis-tyrphostin. We demonstrated that
PAF promoted formation of multimeric aggregates of VE-cadherin with
PtdIns3'-kinase, which was also inhibited by herbimycin and bis-tyrphostin.
Finally, we show by immunostaining of endothelial cells VE-cadherin that PAF
dissociated adherens junctions. The present data provide the first evidence that
treatment of endothelial cells with PAF promoted activation of tyrosine kinases
and the VE-cadherin tyrosine phosphorylation and PtdIns3'-kinase association,
which ultimately lead to the dissociation of adherens junctions. Physical
association between PtdIns3'-kinase, serving as a docking protein, and
VE-cadherin may thus provide an efficient mechanism for amplification and
perpetuation of PAF-induced cellular activation.