title: Harmful singlet oxygen can be helpful.
abstract: Highly reactive harmful singlet oxygen O2(1delta(g)) can be helpful while relaxing to its triplet ground state O2(3sigma(g)-). The energy emitted during this relaxation from the excited energy state is discernable at 634 nm. We report here on the effect of this energy as photon illumination and as energy transfer in air on the production of reactive oxygen species (ROS) by human monocytes, measured as isoluminol-enhanced chemiluminescence. We demonstrate up to 60% decrease in the secretion of ROS after 2-min illumination of the monocytes stimulated with phorbol myristate acetate (PMA). The results provide in vitro documentation of the utility of singlet oxygen energy in modifying cellular behaviour.
authors.affiliation: Wallenberg Laboratory for Cardiovascular Research, University of Göteborg, Sahlgrenska University Hospital, Sweden.
authors.forename: L M
authors.initials: LM
authors.lastname: Hultén
authors.forename: M
authors.initials: M
authors.lastname: Holmström
authors.forename: B
authors.initials: B
authors.lastname: Soussi
mesh_terms: D002374:Catalase / Q000494:pharmacology; D004735:Energy Transfer; D006801:Humans; D008027:Light; D008163:Luminescent Measurements; D008165:Luminol / Q000031:analogs & derivatives; D009000:Monocytes / Q000378:metabolism; D010100:Oxygen / Q000737:chemistry* / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism; D026082:Singlet Oxygen; D013482:Superoxide Dismutase / Q000494:pharmacology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D017382:Reactive Oxygen Species; D026082:Singlet Oxygen; C032487:isoluminol; D008165:Luminol; D002374:Catalase; D013482:Superoxide Dismutase; D013755:Tetradecanoylphorbol Acetate; D010100:Oxygen