Regulation of arachidonic acid release by calcium influx in human endothelial cells.

Abstract:

:In response to stimuli, endothelial cells release arachidonic acid, a lipid precursor of various vasoactive substances. We have investigated the relationships between cytosolic Ca2+ movements and arachidonic acid release in human umbilical vein endothelial cells. Histamine, a receptor-dependent agonist, and thapsigargin, a specific inhibitor of sarco-/endoplasmic Ca2+ pumps, time- and dose-dependently increased the release of [1-14C]-arachidonic acid. This release was inhibited by AACOCF3, a selective inhibitor of cytosolic phospholipase A2 (PLA2). In the absence of Ca2+ influx, arachidonic acid release was suppressed in both histamine- and thapsigargin-stimulated cells, despite marked elevations of cytosolic Ca2+ concentration ([Ca2+]i). In the presence of Ca2+ influx, arachidonic acid release was reduced in cells treated with BAPTA, an intracellular Ca2+ buffer, or with SK&F 96365, a receptor-operated Ca2+ channel blocker. Arachidonic acid release was analyzed as a function of the two successive phases of Ca2+ response to stimulation: Ca2+ peak and plateau phase, reflecting Ca2+ mobilization from internal stores and Ca2+ influx, respectively. The amount of arachidonic acid released was directly related to [Ca2+]i values measured at the influx phase with a 80 nM [Ca2+]i threshold, similar to that reported for PLA2 translocation. This suggests that Ca2+ entry from the extracellular space is essential for activating cytosolic PLA2 in human endothelial cells.

journal_name

J Vasc Res

authors

Millanvoye-Van Brussel E,David-Dufilho M,Pham TD,Iouzalen L,Aude Devynck M

doi

10.1159/000025647

keywords:

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

235-44

issue

3

eissn

1018-1172

issn

1423-0135

pii

25647

journal_volume

36

pub_type

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