title: Oxidative stress-induced cellular damage caused by UV and methyl viologen in Euglena gracilis and its suppression with rutin.
abstract: The effects of ultraviolet radiation (UV-A: 320-400 nm and UV-B: 280-320 nm) and methyl viologen (MV) single or combined exposure, on the cell growth, viability and morphology of two strains of the unicellular flagellate Euglena gracilis, using the Z strain as a plant model and the achlorophyllous mutant SMZ strain as an animal model were investigated. Cell growth was not affected by MV only, whereas UV-A or UV-B single and combined exposure with MV inhibited the cell growth or decreased the viability. The SMZ strain had a higher number of abnormal cells than the Z strain after the third dose of UV-B was delivered simultaneously with MV. The abnormal cell number decreased when E. gracilis SMZ cells were preincubated with 100 microM rutin prior to the UV-B and MV exposure. There were higher abnormal cell numbers with groups exposed to UV rather than MV single exposure. Combined exposure to UV-B and 200 microM MV induced the highest levels of TBARS in both strains, and with the supplementation of rutin these high levels were suppressed. These results suggest that UV-A or UV-B irradiation alone or combined with MV cause considerable oxidative damage in E. gracilis cells, and rutin supplementation may suppress their adverse effects.
authors.affiliation: Laboratory of Food Wholesomeness, Department of Life Sciences, Graduate School of Fisheries Science, Hokkaido University, 3-1-1 Minato, Hakodate 041-8611, Japan.
authors.forename: Helen
authors.initials: H
authors.lastname: Palmer
authors.forename: Mari
authors.initials: M
authors.lastname: Ohta
authors.forename: Masumi
authors.initials: M
authors.lastname: Watanabe
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Suzuki
mesh_terms: D000818:Animals; D002455:Cell Division / Q000187:drug effects; D005056:Euglena gracilis / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects*; D006540:Herbicides / Q000494:pharmacology*; D018384:Oxidative Stress; D010269:Paraquat / Q000494:pharmacology*; D012431:Rutin / Q000494:pharmacology*; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: D006540:Herbicides; D017392:Thiobarbituric Acid Reactive Substances; D012431:Rutin; D010269:Paraquat