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Involvement of MAP kinases in the control of cPLA(2) and arachidonic acid release in endothelial cells.

Abstract：

:Cytosolic Phospholipase A(2) (cPLA(2)) has been implicated in receptor-mediated release of arachidonic acid from membrane phospholipids, the limiting step in prostacyclin and other eicosanoid production. Its activity is controlled by Ca(++) levels and enzymatically regulated phosphorylation. The purpose of this study was to assess the importance of phosphorylation of cPLA(2) in human umbilical vein endothelial cells and to identify the kinases involved. Inhibitors were used to study the pathways leading to phosphorylation and activation of mitogen activated protein kinases (MAP-kinases) and cPLA(2), as well as release of arachidonic acid and prostacyclin production after stimulation with different agonists. We have found that agonists that release arachidonic acid, including histamine, thrombin, AlF(4)(-), and pervanadate, all activate the MAP kinases ERK, p38 and JNK and cause phosphorylation of cPLA(2). Agonist specific differences in the signal transduction pathways included variable contribution of tyrosine phosphorylation, protein kinase C and ERK activity, and different effects of pertussis toxin. Treatment with PD98059 (inhibitor of ERK-activation) or SB203580 (inhibitor of p38) caused partial decrease in arachidonic acid release and cPLA(2) activity. In contrast the nonspecific protein kinase inhibitor staurosporin completely inhibited cPLA(2) activity. We conclude that in endothelial cells arachidonic acid release is largely mediated by cPLA(2) through agonist-specific pathways. The MAP kinases ERK and p38 both have demonstrable but not major effect on agonist stimulated arachidonic acid release and the data suggest that an additional unidentified kinase also has a role.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Gudmundsdóttir IJ,Halldórsson H,Magnúsdóttir K,Thorgeirsson G

doi

10.1016/s0021-9150(00)00631-6

keywords:

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

81-90

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(00)00631-6

journal_volume

156

pub_type

杂志文章

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