title: Influence of fungal infection on the DOPA-semiquinone and DOPA-quinone production in haemolymph of Galleriamellonella larvae.
abstract: The formation of reactive oxygen metabolites in haemolymph of Galleria mellonella larvae was studied by ESR spectroscopy. The inhibition of the production of the reactive oxygen metabolites of DOPA in haemolymph under the action of fungal infection was shown using spin trap 1-hydroxy-3-carboxy-pyrrolidine. This inhibition correlated with decrease of phenoloxidase activity in haemolymph of infected insects. Simultaneously, the decrease of production of DOPA-semiquinone was detected using method of spin stabilization by diamagnetic metal ions. Moreover, it was shown that the formation of DOPA-quinone was slowed down in haemolymph of infected insects. Our results suggest that the DOPA-derived quinones/semiquinones may be involved in immune response of insects as part of its defense mechanism.
authors.affiliation: Russian Academy of Sciences, Institute of Chemical Kinetics and Combustion, Novosibirsk 630090, Russia.
authors.forename: Irina A
authors.initials: IA
authors.lastname: Slepneva
authors.forename: Denis A
authors.initials: DA
authors.lastname: Komarov
authors.forename: Viktor V
authors.initials: VV
authors.lastname: Glupov
authors.forename: Valery V
authors.initials: VV
authors.lastname: Serebrov
authors.forename: Valery V
authors.initials: VV
authors.lastname: Khramtsov
mesh_terms: D000818:Animals; D016227:Benzoquinones / Q000378:metabolism; D004295:Dihydroxyphenylalanine / Q000031:analogs & derivatives* / Q000096:biosynthesis*; D006458:Hemolymph / Q000378:metabolism*; D006999:Hypocreales / Q000472:pathogenicity; D007814:Larva / Q000378:metabolism; D009036:Moths / Q000276:immunology / Q000378:metabolism* / Q000382:microbiology; D009181:Mycoses / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D016227:Benzoquinones; D017382:Reactive Oxygen Species; C025232:semiquinone radicals; D004295:Dihydroxyphenylalanine; C035157:dopaquinone