Abstract
Background & Objective: Taurine is a sulfur amino acid that protects cells from self-destruction during oxidative processes, such as chlorinated oxidants (hypochlorous acid, HOCl). Our objective was to compare the effects of taurine with myeloperoxidase inhibitors (MPO) on the process of HOCL-induced low density lipoprotein (LDL) changes.
Materials & Methods: We assessed the serum of some blood donors with normal serum lipid levels. We evaluated 1) blocking the neutrophil function by preventing oxidant production by MPO with 3-amino 1,2,4 triazole, potassium cyanide, sodium azide, P-hydroxy-benzoic acid hydrazide (pHBAH), Salicylhydroxamic acid, and benzohydroxarnic acid; 2) trapping of products of activated neutrophils,such as MPO- derived HOCl by taurine , methionine and glycine. Tryptophan destruction in presence of the MPO system was monitored fluorimetrically as a marker of LDL modification.
Results: At a taurine concentration of 40 pM, which is three orders of magnitude below the physiological value, tmax2 was increased by a factor of 50 compared to the control in absence of taurine (20 min versus 0.4 min). P-hydroxy-benzoic acid hydrazide (pHBAH), at a concentration o f 0.3 to 0.75 MM, too, was a potent inhibitor of tryptophan destruction.
Discussion: This study suggests a high potential of taurine to slow down inflammatory processes by modulating the oxidative burst of neutrophils. Taurine was the second most potent netralizer of HOCL, after methionine. Taurine may be used to prevent oxidant damage to neutrophills.
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© 2003, Journal of Kermanshah University of Medical Sciences. This open-access article is available under the Creative Commons Attribution-NonCommercial 4.0 (CC BY-NC 4.0) International License (https://creativecommons.org/licenses/by-nc/4.0/), which allows for the copying and redistribution of the material only for noncommercial purposes, provided that the original work is properly cited.