title: Inhibitory effect of alpha-tocopherol on methemoglobin formation by nitric oxide in normal and acatalasemic mouse hemolysates.
abstract: The inhibitory effect of alpha-tocopherol on methemoglobin formation in normal and acatalasemic mice was studied by exposing their hemolysates to nitric oxide. Methemoglobin formation in normal and acatalasemic mouse hemolysates exposed to nitric oxide were significantly inhibited by the addition of alpha-tocopherol at final concentrations ranging from 1.2 to 5.8 mM. Negative correlations were observed between the logarithm of alpha-tocopherol concentration and the methemoglobin formation. The formation of methemoglobin in acatalasemic mouse hemolysates was greater than that in normal mouse hemolysates with or without added alpha-tocopherol. The methemoglobin formation in acatalasemic mice was also significantly inhibited by addition of more than 500 units/ml of catalase, and the methemoglobin formation in normal and acatalasemic mice was also inhibited with sodium diethyldithiocarbamate at a final concentration of 1 M.
authors.affiliation: Department of Public Health, Okayama University Medical School, Japan.
authors.forename: L X
authors.initials: LX
authors.lastname: Zhen
authors.forename: K
authors.initials: K
authors.lastname: Ishii
authors.forename: K
authors.initials: K
authors.lastname: Taketa
authors.forename: M
authors.initials: M
authors.lastname: Ogata
mesh_terms: D020642:Acatalasia; D000818:Animals; D004305:Dose-Response Relationship, Drug; D006461:Hemolysis; D007700:Kinetics; D008297:Male; D008706:Methemoglobin / Q000378:metabolism*; D051379:Mice; D008809:Mice, Inbred C3H; D008817:Mice, Mutant Strains; D009569:Nitric Oxide / Q000378:metabolism*; D012016:Reference Values; D014810:Vitamin E / Q000494:pharmacology*
chemical_list: D014810:Vitamin E; D009569:Nitric Oxide; D008706:Methemoglobin