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. 2002 Aug 1;365(Pt 3):897–902. doi: 10.1042/BJ20011206

Activated neutrophils oxidize extracellular proteins of endothelial cells in culture: effect of nitric oxide donors.

Grzegorz A Czapski 1, Diana Avram 1, Dmitri V Sakharov 1, Karel W A Wirtz 1, Joanna B Strosznajder 1, Everard H W Pap 1
PMCID: PMC1222711  PMID: 11964140

Abstract

Protein oxidation of human umbilical-vein endothelial cells (HUVEC) in culture was examined under various conditions of oxidative stress. Extracellular protein (ECP) oxidation was assessed by determining dityrosine bond formation, which is indicated by the covalent coupling of the membrane-impermeable tyramine-fluorescein conjugate (TyrFluo) to HUVEC proteins. The acetylated membrane-permeable form of TyrFluo (acetylTyrFluo) was used for the determination of intracellular protein (ICP) oxidation. Oxidative stress was induced by exposing the HUVEC to PMA-activated human neutrophils, to a horseradish peroxidase/hydrogen peroxide (HRP/H(2)O(2)) system or to H(2)O(2) alone. Coupling of the probes was determined by confocal laser scanning microscopy and by Western blotting using anti-fluorescein antibody. Diethylamine nitric oxide (DEANO) was used to determine the effect of NO on the tyrosyl radical formation in proteins. The oxidative burst generated by activated neutrophils for 15 min, resulted in inducing dityrosine formation in ECP of HUVEC. Similar results were obtained with HRP/H(2)O(2), but H(2)O(2) alone did not have any effect on ECP. In the presence of DEANO (0.1 mM or higher), ECP oxidation was almost completely inhibited. This indicates that NO may protect endothelial cells against protein oxidation by activated neutrophils under pro-inflammatory conditions. Activated neutrophils did not oxidize ICP of HUVEC, which strongly suggests that the effect of the oxidative burst was restricted to the proteins exposed to the medium.

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Selected References

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