{"refrec":{"BRefID":238385,"RR":"<b>Genard, B.; Marie, B.; Loumaye, E.; Knoops, B.; Legendre, P.; Zal, F.; Rees, J.-F.</b> (2013). Living in a hot redox soup: antioxidant defences of the hydrothermal worm <i>Alvinella pompejana</i>. <i>Aquat. Biol. 18(3)</i>: 217-228. <a href=\"http://dx.doi.org/10.3354/ab00498\" target=\"_blank\">dx.doi.org/10.3354/ab00498</a>","BEntID":230072,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Aquat. Biol. 18(3)</i>: 217-228. <a href=\"https://dx.doi.org/10.3354/ab00498\" target=\"_blank\">https://dx.doi.org/10.3354/ab00498</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Genard, B.; Marie, B.; Loumaye, E.; Knoops, B.; Legendre, P.; Zal, F.; Rees, J.-F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Genard, B. <i>et al.</i>","Englishabstract":"The hydrothermal Pompeii worm <i>Alvinella pompejana</i> lives very close to the walls of black smokers and is therefore exposed to high-temperature venting fluid containing high concentrations of sulphides and metals. The highly aerobic metabolism of these annelids, together with these extreme physico-chemical conditions, theoretically accelerates redox processes in and around the worm, potentially increasing oxidative threat by reactive oxygen species (ROS). This prompted us to analyse activity of antioxidant enzymes in <i>A. pompejana</i> tissues and investigate whether they are adjusted to the endogenous production of ROS by oxidative phosphorylations and/or to the environmental conditions. This was investigated by comparing antioxidant and metabolic enzyme activities in gills, head, body wall, pygidium and guts of <i>A. pompejana</i> collected at different vent sites of the East Pacific Rise. The antioxidant defence arsenal of <i>A.&nbsp;pompejana</i> is peculiar, showing very low catalase (CAT) activity and very high superoxide dismutase (SOD) activity in most tissues. It is very likely that CAT is not expressed in <i>A. pompejana</i>, as this haemic enzyme could be inhibited by the high sulphide concentrations prevailing in the worm’s environment. <i>A. pompejana</i> does not compensate for the low hydrogen peroxide scavenging activity of CAT by higher glutathione peroxidase (GPX) activity levels. This latter enzyme correlates well with cytochrome <i>c</i> oxidase and citrate synthase in most tissues, suggesting that oxidative metabolism represents the main source of peroxides managed by GPX. On the&nbsp;contrary, SOD shows no correlation with any metabolic enzyme and is likely adjusted to respiration-independent ROS generation. Source variations in enzyme activities are mainly observed in the animal’s gills and gut, possibly reflecting differences in the vent fluid thermal regime and/or chemistry.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Living in a hot redox soup: antioxidant defences of the hydrothermal worm <i>Alvinella pompejana</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Deep-sea hydrothermal vent; Oxidative stress; Antioxidant defences;Metabolism; Alvinellid; Polychaete","OtherDescriptors":null,"Notes":null,"AnaPub":2013,"MonPub":null,"DateUpdate":"2014-06-05","DateCreate":"2014-05-18","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000322413200002","VABBcode":null,"OpenAcc":1,"DOI":"10.3354/ab00498"},"refs":null,"anarec":{"AnaID":238385,"PubliDate":2013,"Pagination":"217-228","XtraPublOfAnaID":null,"ISBN":null,"Volume":"18","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":123983,"SerRR":"Aquatic Biology. 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