title: Oxidative stress and defence mechanisms of the freshwater cladoceran Daphnia longispina exposed to UV radiation.
abstract: The aim of the present study is to evaluate the occurrence of oxidative stress in the cladoceran Daphnia longispina exposed to UV-A and UV-B radiation. The activity of antioxidant enzymes and lipid peroxidation markers is investigated and the protective action of ascorbic acid determined. Results show differences in the lethality radioinduced by UV-A and UV-B. Both UV-A and UV-B exposure cause an important increase in malonaldehyde (MDA) concentration and catalase activity. Ascorbic acid addition reduces the MDA concentration, indicating that the oxidative stress caused by either UV-A or UV-B radiation can be controlled by antioxidants. The increase of the antioxidant enzymes may be a response mechanism to oxidative stress.
authors.affiliation: Comisión Nacional de Energía Atómica, Dpto. Radiobiología, Buenos Aires, Argentina. pamavega@cnea.gov.ar
authors.forename: M P
authors.initials: MP
authors.lastname: Vega
authors.forename: R A
authors.initials: RA
authors.lastname: Pizarro
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D001205:Ascorbic Acid / Q000494:pharmacology; D003470:Culture Media; D003621:Daphnia / Q000187:drug effects / Q000528:radiation effects*; D005618:Fresh Water; D015227:Lipid Peroxidation; D018384:Oxidative Stress; D014466:Ultraviolet Rays
chemical_list: D000975:Antioxidants; D003470:Culture Media; D001205:Ascorbic Acid