Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/S1532-0456(02)00010-8
Titel (primär) Alterations of tissue glutathione levels and metallothionein mRNA in rainbow trout during single and combined exposure to cadmium and zinc
Autor Lange, A.; Ausseil, O.; Segner, H.
Quelle Comparative Biochemistry and Physiology C-Toxicology & Pharmacology
Erscheinungsjahr 2002
Department OEC; COE
Band/Volume 131
Heft 3
Seite von 231
Seite bis 243
Sprache englisch
Abstract The objective of this study was to assess the effects of Cd and Zn exposure of rainbow trout (Oncorhynchus mykiss) on (a) hepatic glutathione (GSH) levels; and (b) hepatic and branchial metallothionein (MT) mRNA expression. Juvenile rainbow trout were exposed to waterborne Cd (nominal concentrations: 1.5 or 10 mug Cd l(-1)), Zn (150 or 1000 mug Zn l(-1)) or Cd/Zn mixtures 0.5 mug Cd l(-1) with 200 mug Zn l(-1) or 10 mug Cd l(-1) with 1000 mug Zn l(-1)). After 14 and 28 days of treatment, hepatic concentrations of total glutathione, oxidized glutathione (GSSG) and cysteine were determined by means of fluorometric high performance liquid chromatography (HPLC). Branchial and hepatic expression of MT mRNA was measured by means of semi-quantitative RT-PCR. Exposure of trout to Zn did not result in significantly elevated tissue levels of Zn, whereas Cd accumulation factors changed significantly with time and concentration. Despite of the absence of Zn accumulation, hepatic GSH but not MT mRNA levels were significantly altered in Zn-exposed fish. Cd, on the contrary, affected mainly the MT response but not GSH. Also tissue specific differences in the regulation of the two thiol pools were expressed. The thiol response after exposure to metal mixtures could not be explained by simple addition of the effects of the individual metals. The results indicate that cellular thiol pools show different reaction patterns with respect to specific metals and metal mixtures. Under conditions of long-term, low dose metal exposure, the function of GSH appears to go beyond that of a transitory, first line defense.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=5727
Lange, A., Ausseil, O., Segner, H. (2002):
Alterations of tissue glutathione levels and metallothionein mRNA in rainbow trout during single and combined exposure to cadmium and zinc
Comp. Biochem. Physiol. C-Toxicol. Pharmacol. 131 (3), 231 - 243 10.1016/S1532-0456(02)00010-8