Abstract
Extracellular myeloperoxidase (MPO) is a macrophage modulator which stimulates release of the pro-inflammatory cytokine TNFα in addition to reactive oxygen species (ROS) generated by these cells. MPO-induced macrophage secretion of pro-inflammatory mediators indirectly upregulates neutrophil pro-inflammatory capacity through contributing to neutrophil priming for respiratory burst activity. However, to date the question concerning a direct influence on the neutrophil by MPO or the MPO-derived product hypochlorous acid (HOCl) remains to be elucidated. Taurine, the most abundant free amino acid in human neutrophils acts as an antioxidant through the formation of taurine-chloramine by sequestering HOCl. Zinc also has antioxidant properties and taurine-zinc complexes have been shown to have greater efficacy than either agent alone in protection against ROS-mediated tissue damage. The aims of this study were: (a) to determine if extracellular MPO modulates the inflammatory response through autocrine feedback on the neutrophil and to investigate if taurine either directly or indirectly through taurine-chloramine formation may further influence this pathway and (b) to evaluate the efficacy of a taurine-zinc combination in modulating MPO-induced CD11b receptor expression.
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Stapleton, P.P., Redmond, H.P., Bouchier-Hayes, D.J. (1998). Myeloperoxidase (MPO) May Mediate Neutrophil Adherence to the Endothelium through Upregulation of CD11b Expression - An Effect Downregulated by Taurine. In: Schaffer, S., Lombardini, J.B., Huxtable, R.J. (eds) Taurine 3. Advances in Experimental Medicine and Biology, vol 442. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0117-0_24
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DOI: https://doi.org/10.1007/978-1-4899-0117-0_24
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