title: Effect of lycopene and beta-carotene on peroxynitrite-mediated cellular modifications.
abstract: Peroxynitrite formed by the reaction of superoxide and nitric oxide is a highly reactive species with a role in various pathological processes such as cancer, chronic inflammation, and cardiovascular and neurological diseases. In the present study, the effect of the carotenoids, lycopene and beta-carotene, on peroxynitrite-mediated modifications in plasmid DNA as well as cellular DNA and proteins were investigated. In pUC18 plasmid DNA, these carotenoids strongly inhibited DNA strand breaks caused by peroxynitrite generated from 3-morpholinosydnonimine (SIN-1). SIN-1 was also used to determine effects on DNA damage and protein tyrosine nitration in Chinese hamster lung fibroblasts. SIN-1 dose-dependently increased nitration of proteins in cells above basal levels as determined by Western blotting. This nitration was inhibited in the presence of the uric acid as well as lycopene. Physiological concentrations (0.31-10 microM) of lycopene and beta-carotene also had protective effects on DNA damage, as measured by the comet assay. Lycopene significantly reduced DNA damage particularly, in the median range of concentrations (2.5 microM). The protective effects of lycopene and beta-carotene could be due to their scavenging of reactive oxygen (ROS) and/or nitrogen species (RNS) as they reduce the amount of intracellular ROS/RNS produced following treatment with SIN-1 by as much as 47.5% and 42.4%, respectively. The results obtained in this study suggest that carotenoids may alleviate some of the deleterious effects of peroxynitrite and possibly other reactive nitrogen species as well in vivo.
authors.affiliation: Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan.
authors.forename: Kaampwe
authors.initials: K
authors.lastname: Muzandu
authors.forename: Mayumi
authors.initials: M
authors.lastname: Ishizuka
authors.forename: Kentaro Q
authors.initials: KQ
authors.lastname: Sakamoto
authors.forename: Zein
authors.initials: Z
authors.lastname: Shaban
authors.forename: Khlood
authors.initials: K
authors.lastname: El Bohi
authors.forename: Akio
authors.initials: A
authors.lastname: Kazusaka
authors.forename: Shoichi
authors.initials: S
authors.lastname: Fujita
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D002338:Carotenoids / Q000494:pharmacology*; D002460:Cell Line; D002470:Cell Survival; D020552:Comet Assay; D006224:Cricetinae; D003412:Cricetulus; D004249:DNA Damage / Q000187:drug effects*; D000077276:Lycopene; D008981:Molsidomine / Q000031:analogs & derivatives / Q000633:toxicity; D020030:Nitric Oxide Donors / Q000633:toxicity; D030421:Peroxynitrous Acid / Q000633:toxicity*; D014443:Tyrosine / Q000031:analogs & derivatives / Q000378:metabolism; D019207:beta Carotene / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D020030:Nitric Oxide Donors; D019207:beta Carotene; D030421:Peroxynitrous Acid; D002338:Carotenoids; C002744:3-nitrotyrosine; D014443:Tyrosine; C002385:linsidomine; D008981:Molsidomine; D000077276:Lycopene