title: Impact of digenean parasite infection on metallothionein synthesis by the cockle (Cerastoderma edule): a multivariate field monitoring.
abstract: Metallothioneins (MT) are proteins that play an important role in metabolism of essential metals and detoxification of trace metals from living organisms. Their synthesis is induced by metal pollution but can also be exacerbated by other factors such as reproduction processes. In this context, we monitored MT concentrations in a cockle Cerastoderma edule (marine bivalve) population and highlighted the effect of a castrating digenean parasite, Labratrema minimus. In spent cockles, MT levels were low (ca. 5 nmol sites g(-1), fresh weight) but slightly higher in parasitized individuals. During gametogenesis, MT synthesis increased in all cockles, but concentrations were lower in parasitized individuals (18 against 27 nmol sites g(-1), fw in unparasitized cockles) in relation with gonad damage by parasites. Therefore, it is suggested that parasite infection in cockles can modulate MT synthesis that could consequently interfere with the response of these protective proteins in case of metal contamination.
authors.affiliation: Laboratoire d'Ecophysiologie et Ecotoxicologie des Systèmes Aquatiques, UMR 5805 Université Bordeaux 1, Place Peynaud, 33120 Arcachon, France. m.baudrimont@epoc.u-bourdeaux1.fr
authors.forename: Magalie
authors.initials: M
authors.lastname: Baudrimont
authors.forename: Xavier
authors.initials: X
authors.lastname: de Montaudouin
authors.forename: Audrey
authors.initials: A
authors.lastname: Palvadeau
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D049628:Body Size / Q000502:physiology; D049873:Cardiidae / Q000737:chemistry / Q000469:parasitology* / Q000502:physiology; D008668:Metallothionein / Q000032:analysis / Q000096:biosynthesis* / Q000502:physiology*; D019216:Metals, Heavy / Q000032:analysis; D010986:Platyhelminths / Q000502:physiology*; D012098:Reproduction / Q000502:physiology; D013997:Time Factors; D014200:Trematoda / Q000302:isolation & purification; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D008668:Metallothionein