Role of 8-epi PGF2alpha, 8-isoprostane, in H2O2-induced derangements of pulmonary artery endothelial cell barrier function

The non-enzymatic peroxidation product of arachidonic acid, 8-epi-PGF2alpha or 8-isoprostane (8-IP) was measured in H2O2-exposed cultured pulmonary artery endothelial cell (PAEC) monolayers using a commercially-available enzyme immunoassay kit. H2O2 (50 microM for 1-30 min) significantly increased 8...

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Published in:Prostaglandins, leukotrienes and essential fatty acids leukotrienes and essential fatty acids, 1998-01, Vol.58 (1), p.9-16
Main Authors: Hart, C M, Karman, R J, Blackburn, T L, Gupta, M P, Garcia, J G, Mohler, 3rd, E R
Format: Article
Language:English
Subjects:
Animals
Arachidonic Acid - metabolism
Cells, Cultured
Dinoprost - analogs & derivatives
Dinoprost - metabolism
Dinoprost - pharmacology
Endothelium, Vascular - drug effects
Endothelium, Vascular - physiology
F2-Isoprostanes
Hydrogen Peroxide - pharmacology
Lipid Peroxidation - physiology
Lipid Peroxides - metabolism
Oxidative Stress
Pulmonary Artery - drug effects
Swine
Vasoconstrictor Agents - pharmacology
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Summary:The non-enzymatic peroxidation product of arachidonic acid, 8-epi-PGF2alpha or 8-isoprostane (8-IP) was measured in H2O2-exposed cultured pulmonary artery endothelial cell (PAEC) monolayers using a commercially-available enzyme immunoassay kit. H2O2 (50 microM for 1-30 min) significantly increased 8-IP production in a time-dependent fashion. Treatment with higher H2O2 concentrations (100 or 250 microM) failed to further increase 8-IP generation. Determinations of thiobarbituric acid reactive substances (TBARS) and lipid hydroperoxides (LOOH) were not sufficiently sensitive to detect lipid peroxidation in PAEC exposed to 50 microM H2O2 for 15 min. 8-IP (100 pM-500 nM for 2 h) caused PAEC monolayer barrier dysfunction measured as the transmonolayer clearance of albumin without causing significant PAEC cytotoxicity (measured as intracellular lactate dehydrogenase release). This is the first report to provide evidence that 8-IP generated in H2O2-exposed PAEC contributes to oxidant-mediated alterations in monolayer barrier function at non-cytotoxic concentrations.
ISSN:0952-3278