PMID: 9434096Jan 20, 1998Paper

Lipopolysaccharide-induced increase in plasma nitrotyrosine concentrations in rats

Biochimica Et Biophysica Acta
Y KamisakiY Kishimoto

Abstract

Since the production of peroxynitrite may contribute to the pathophysiology of endotoxemia or sepsis, the quantities of the produced peroxynitrite were evaluated in rats after lipopolysaccharide (LPS) treatment by measuring plasma nitrotyrosine concentrations with a new method. The intraperitoneal administration of LPS caused a persistent increase in plasma nitrotyrosine concentrations, which reached a maximum with 6-fold level of the base line (105 pmol ml-1) at 24 h and gradually declined to 3-fold level of the base line at 7 days. However, plasma concentrations of nitrite and nitrate peaked at 18 h, returning to base line within 48 h. The effect of LPS on the increase in plasma concentration of nitrotyrosine was dose-dependent and consistent with that of nitrite and nitrate concentrations. On the other hand, intravenous injection of nitrotyrosine revealed a rapid clearance with a plasma half-life of 1.67 h. These results indicate that the elevation of plasma nitrotyrosine concentrations may persist for more than a week after LPS treatment, and that the determination of plasma nitrotyrosine concentrations may be useful to detect the previous peroxynitrite-dependent oxidative damages.

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