Journal
CLINICAL BIOCHEMISTRY
Volume 41, Issue 13, Pages 1078-1083Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.clinbiochem.2008.06.008
Keywords
neopterin; 7,8-dihydroneopterin; inflammation; pus; tocopherol; protein-bound DOPA; protein-oxidation; TBARS
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Objectives: Plasma neopterin is a clinical marker of inflammation. Interferon-gamma triggers 7,8-dihydroneopterin and its oxidation product, neopterin, to be released from macrophages. 7,8-dihydroneopterin is a potent antioxidant which can protect macrophages from oxidative damage in vitro. This study examined whether 7,8-dihydroneopterin/neopterin levels reach sufficient concentrations in human pus to provide antioxidant activity and be the source of plasma neopterin. Design and methods: Pus was removed by needle aspiration from 19 patients and examined for total neopterin, protein-bound DOPA, dityrosine, alpha-tocopherol, lipid oxidation and protein carbonyls. Results: Total neopterin was detected between 50 nM and 1.2 mu M, with an average concentration of 0.15 mu M. Significant quantities of oxidized proteins and lipids were detected. alpha-Tocopherol concentrations positively correlate with total neopterin levels. Conclusions: Total neopterin levels found in the pus was up to 100 times higher than that reported in plasma, suggesting plasma neopterin originates from inflammatory sites. The concentration of total neopterin suggests that 7,8-dihydroneopterin could act as an antioxidant during inflammation. (C) 2008 The Canadian Society of Clinical Chemists. Published by Elsevier Inc. All rights reserved.
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