title: Protection against UV-induced toxicity and lack of mutagenicity of Antarctic Sanionia uncinata.
abstract: Antarctica moss Sanionia uncinata (Hedw.) Loeske is exposed in situ to damaging levels of ultraviolet (UV) radiation. This moss has the ability to respond to UV radiation exposure producing secondary metabolites such as flavonoids, and has been recommended as a potential source of photoprotective compounds and antioxidants. The aim of the present paper was to investigate the free-radical scavenging activity and mutagenic and photomutagenic properties of methanolic (ME), hydroethanolic (HE) and ethanolic (EE) extracts of S. uncinata. The phenolic contents were evaluated by high-performance liquid chromatography (HPLC) and spectrophotometry. The findings showed that ME and EE presented the highest phenolic contents and inhibited free radical-scavenging activity against 2,2'-diphenyl-1 picrylhydrazyl (DPPH) and the HPLC analysis indicated several classes of phenolic acids and flavonoids. The sun protection factors (SPF) were determined by an in vitro method and the results showed significant values. The SPF values of BZ-3 at 50μg/mL increased significantly in association with ME, HE and EE. The extracts did not induce mutagenicity in auxotrophic Salmonella typhimurium histidine and photomutagenicity was not detected in the TA102 and TA104 strains after exposure to UV-A at doses of up to 6.5J/cm2for the TA102 strain and up to 0.24J/cm2for the TA104 strain. In addition, with the exception of ME, all the extracts induced photoprotective effects in the presence of the TA104 strain at 0.04J/cm2. The present results suggest that S. uncinata extracts did not induce photomutation and showed promise for photoprotection against the photobiological and ROS-inducing effects of the UV-A radiation.
authors.affiliation: Laboratory of Environmental Mutagenesis, Department of Biophysics and Biometry, Roberto Alcantra Gomes Biology Institute, University of the State of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: A S
authors.initials: AS
authors.lastname: Fernandes
authors.affiliation: Farmanguinhos, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil.
authors.forename: J L
authors.initials: JL
authors.lastname: Mazzei
authors.affiliation: Laboratory of Environmental Mutagenesis, Department of Biophysics and Biometry, Roberto Alcantra Gomes Biology Institute, University of the State of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: C G
authors.initials: CG
authors.lastname: Oliveira
authors.affiliation: Laboratory of Environmental Mutagenesis, Department of Biophysics and Biometry, Roberto Alcantra Gomes Biology Institute, University of the State of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: H
authors.initials: H
authors.lastname: Evangelista
authors.affiliation: Institute of Chemistry, University of the State of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: M R C
authors.initials: MR
authors.lastname: Marques
authors.affiliation: School of Pharmacy, Fluminense Federal University, Niteroi, RJ, Brazil. Electronic address: elisaavelino@id.uff.br.
authors.forename: E R A
authors.initials: ER
authors.lastname: Ferraz
authors.affiliation: Laboratory of Environmental Mutagenesis, Department of Biophysics and Biometry, Roberto Alcantra Gomes Biology Institute, University of the State of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: I
authors.initials: I
authors.lastname: Felzenszwalb
mesh_terms: D000818:Animals; D000864:Antarctic Regions; D044002:Bryophyta; D004305:Dose-Response Relationship, Drug; D016166:Free Radical Scavengers / Q000302:isolation & purification / Q000528:radiation effects / Q000633:toxicity; D009152:Mutagenicity Tests / Q000379:methods; D009153:Mutagens / Q000633:toxicity; D010936:Plant Extracts / Q000302:isolation & purification / Q000528:radiation effects* / Q000633:toxicity; D051381:Rats; D012486:Salmonella typhimurium; D013473:Sunscreening Agents / Q000302:isolation & purification / Q000528:radiation effects* / Q000633:toxicity; D014466:Ultraviolet Rays / Q000009:adverse effects*
chemical_list: D016166:Free Radical Scavengers; D009153:Mutagens; D010936:Plant Extracts; D013473:Sunscreening Agents
keywords: Free-radical scavenging; Phenolic compounds; Photomutagenicity; Sanionia uncinata; Sun protection factor