title: Inhibition of luminol-enhanced chemiluminescence by reduced pterins.
abstract: Luminol-enhanced chemiluminescence, initially induced by exogenous H2O2 or enzymatic reactions which generate reactive oxygen species in situ, is inhibited by reduced pterins. Except dihydroneopterin which is as effective as tetrahydroneopterin, all tetrahydropterins are more effective than dihydropterins, which in turn is more effective than oxidized pterins in removing reactive oxygen species such as O2-. and H2O2. The antioxidant efficacy of some reduced pterins is better than ascorbic acid and L-glutathione. Reduced pterins may act as physiological scavengers for reactive oxygen species, and play an important role in cellular defense against oxidative damage.
authors.affiliation: Department of Human Biological Chemistry and Genetics, University of Texas Medical Branch, Galveston 77555-0652.
authors.forename: R S
authors.initials: RS
authors.lastname: Shen
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D001708:Biopterins / Q000031:analogs & derivatives / Q000494:pharmacology; D005069:Evaluation Studies as Topic; D005949:Glucose Oxidase / Q000378:metabolism; D008163:Luminescent Measurements; D008165:Luminol / Q000494:pharmacology*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D011622:Pterins / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism*; D014969:Xanthine Oxidase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D011622:Pterins; D017382:Reactive Oxygen Species; D001708:Biopterins; C023455:tetrahydroneopterin; D008165:Luminol; D005949:Glucose Oxidase; D014969:Xanthine Oxidase