Changes in metallothionein concentrations in response to variation in natural factors (salinity, sex, weight) and metal contamination in crabs from a metal-rich estuary
Identifieur interne : 000291 ( France/Analysis ); précédent : 000290; suivant : 000292Changes in metallothionein concentrations in response to variation in natural factors (salinity, sex, weight) and metal contamination in crabs from a metal-rich estuary
Auteurs : S. Legras [France] ; C. Mouneyrac [France] ; J. C. Amiard [France] ; C. Amiard-Triquet [France] ; P. S. Rainbow [Royaume-Uni]Source :
- Journal of Experimental Marine Biology and Ecology [ 0022-0981 ] ; 2000.
Abstract
Intermoult male and female crabs Pachygrapsus marmoratus and Carcinus maenas were sampled from three sites between the mouth and 25 km upstream in the Gironde, the most Cd-contaminated estuary in France, in order to study the relative importance of natural factors (salinity, sex, weight) and accumulated metal concentrations on metallothionein (MT) concentrations. In the two species studied, higher metal, total protein and MT concentrations were observed in the hepatopancreas than in the gills. In P. marmoratus, MT concentrations were mainly related to changes in the natural factors even if MT and Zn concentrations were positively correlated in the hepatopancreas whereas in C. maenas, the main relationships were with accumulated metal levels. In the case of the natural factors, the most important ones were weight in gills of both crab species, and salinity changes in both hepatopancreas and gills of P. marmoratus. Cd and Cu concentrations in both organs of the two species were inversely related to salinity. The same observation was found for Zn concentrations in C. maenas but not in P. marmoratus. In the hepatopancreas of both species, the highest total protein concentrations were found in crabs from the site with the highest salinity, whereas there were no such differences in the gills. It seems that changes in MT concentrations are linked more to changes in general protein metabolism than to changes in metal accumulation. Thus it was important to examine the storage of metals in other tissue compartments, particularly the insoluble fraction which includes mineral granules which is known to also contribute to trace metal detoxification in invertebrates. In the gills of the crabs, Zn was present mainly in the insoluble fraction, whereas Cd was nearly equally distributed between soluble and insoluble fractions. In contrast, Cu in the gills and all three metals in the hepatopancreas of both species were mainly cytosolic, but this does not necessarily imply a predominant role for MT since the cytosolic fraction also includes other macromolecules which may be the target binding site for accumulated trace metals.
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DOI: 10.1016/S0022-0981(99)00187-2
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Rainbow</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Zoology, The Natural History Museum, Cromwell Rd., London SW7 5BD</wicri:regionArea><wicri:noRegion>London SW7 5BD</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Experimental Marine Biology and Ecology</title><title level="j" type="abbrev">JEMBE</title><idno type="ISSN">0022-0981</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2000">2000</date><biblScope unit="volume">246</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="259">259</biblScope><biblScope unit="page" to="279">279</biblScope></imprint><idno type="ISSN">0022-0981</idno></series><idno type="istex">1E72996897769DB913B774B55890295FEFE37912</idno><idno type="DOI">10.1016/S0022-0981(99)00187-2</idno><idno type="PII">S0022-0981(99)00187-2</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-0981</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Intermoult male and female crabs Pachygrapsus marmoratus and Carcinus maenas were sampled from three sites between the mouth and 25 km upstream in the Gironde, the most Cd-contaminated estuary in France, in order to study the relative importance of natural factors (salinity, sex, weight) and accumulated metal concentrations on metallothionein (MT) concentrations. In the two species studied, higher metal, total protein and MT concentrations were observed in the hepatopancreas than in the gills. In P. marmoratus, MT concentrations were mainly related to changes in the natural factors even if MT and Zn concentrations were positively correlated in the hepatopancreas whereas in C. maenas, the main relationships were with accumulated metal levels. In the case of the natural factors, the most important ones were weight in gills of both crab species, and salinity changes in both hepatopancreas and gills of P. marmoratus. Cd and Cu concentrations in both organs of the two species were inversely related to salinity. The same observation was found for Zn concentrations in C. maenas but not in P. marmoratus. In the hepatopancreas of both species, the highest total protein concentrations were found in crabs from the site with the highest salinity, whereas there were no such differences in the gills. It seems that changes in MT concentrations are linked more to changes in general protein metabolism than to changes in metal accumulation. Thus it was important to examine the storage of metals in other tissue compartments, particularly the insoluble fraction which includes mineral granules which is known to also contribute to trace metal detoxification in invertebrates. In the gills of the crabs, Zn was present mainly in the insoluble fraction, whereas Cd was nearly equally distributed between soluble and insoluble fractions. In contrast, Cu in the gills and all three metals in the hepatopancreas of both species were mainly cytosolic, but this does not necessarily imply a predominant role for MT since the cytosolic fraction also includes other macromolecules which may be the target binding site for accumulated trace metals.</div></front></TEI><affiliations><list><country><li>France</li><li>Royaume-Uni</li></country><region><li>Pays de la Loire</li></region><settlement><li>Angers</li><li>Nantes</li></settlement></list><tree><country name="France"><region name="Pays de la Loire"><name sortKey="Legras, S" sort="Legras, S" uniqKey="Legras S" first="S." last="Legras">S. Legras</name></region><name sortKey="Amiard Triquet, C" sort="Amiard Triquet, C" uniqKey="Amiard Triquet C" first="C." last="Amiard-Triquet">C. Amiard-Triquet</name><name sortKey="Amiard, J C" sort="Amiard, J C" uniqKey="Amiard J" first="J. C." last="Amiard">J. C. Amiard</name><name sortKey="Mouneyrac, C" sort="Mouneyrac, C" uniqKey="Mouneyrac C" first="C." last="Mouneyrac">C. Mouneyrac</name><name sortKey="Mouneyrac, C" sort="Mouneyrac, C" uniqKey="Mouneyrac C" first="C." last="Mouneyrac">C. Mouneyrac</name></country><country name="Royaume-Uni"><noRegion><name sortKey="Rainbow, P S" sort="Rainbow, P S" uniqKey="Rainbow P" first="P. S." last="Rainbow">P. S. Rainbow</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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