title: Interactions between melatonin and nicotinamide nucleotide: NADH preservation in cells and in cell-free systems by melatonin.
abstract: Interactions of melatonin and nicotinamide adenine dinucleotide (NADH) have been studied in different experimental models including NADH-promoted oxyhemoglobin oxidation, vanadate-induced NADH oxidation and paraquat-induced NADH depletion in cultured PC12 cells. Our findings indicate that melatonin preserves NADH levels under oxidative stress both in cell-free systems and in cultured PC12 cells. These interactions likely involve electron donation by melatonin and reduction of the NAD radical. As a result, the NAD radical is recycled to NADH and melatonin is oxidized to N1-acetyl-N2-formyl-5-methoxykynuramine (AFMK). NADH is a central molecule at the crossroads between energy metabolism and the antioxidant defense system in organisms. Recycling of NADH by melatonin might improve the efficiency of NADH as an energy carrier and as an antioxidant. Interactions between melatonin and NADH may be implicated in mitochondrial metabolism.
authors.affiliation: Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA.
authors.forename: Dun-Xian
authors.initials: DX
authors.lastname: Tan
authors.forename: Lucien C
authors.initials: LC
authors.lastname: Manchester
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Sainz
authors.forename: Juan C
authors.initials: JC
authors.lastname: Mayo
authors.forename: Josefa
authors.initials: J
authors.lastname: Leon
authors.forename: Ruediger
authors.initials: R
authors.lastname: Hardeland
authors.forename: Burkhard
authors.initials: B
authors.lastname: Poeggeler
authors.forename: Russel J
authors.initials: RJ
authors.lastname: Reiter
mesh_terms: D000818:Animals; D002374:Catalase / Q000378:metabolism; D002474:Cell-Free System / Q000378:metabolism; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism; D007735:Kynuramine / Q000031:analogs & derivatives / Q000378:metabolism; D008550:Melatonin / Q000378:metabolism*; D009243:NAD / Q000378:metabolism*; D009537:Nicotinamide Mononucleotide / Q000378:metabolism*; D010108:Oxyhemoglobins / Q000378:metabolism; D016716:PC12 Cells; D051381:Rats; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D010108:Oxyhemoglobins; D009243:NAD; D009537:Nicotinamide Mononucleotide; D007735:Kynuramine; C041550:N-acetyl-N-formyl-5-methoxykynurenamine; D006861:Hydrogen Peroxide; D002374:Catalase; D013482:Superoxide Dismutase; D008550:Melatonin