Journal
AQUATIC TOXICOLOGY
Volume 89, Issue 4, Pages 214-221Publisher
ELSEVIER
DOI: 10.1016/j.aquatox.2008.07.002
Keywords
Cadmium; Silver sea bream; Metallothionein; G6PDH
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Funding
- Area of Excellence [AoE/P-04/2004]
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In this study, the induction of metallothionein (MT) and glucose-6-phosphate dehydrogenase (G6PDH) gene expression in response to exposure to cadmium (Cd2+) was investigated in silver sea bream (Spares sarba) in vivo. In addition, a primary hepatocyte culture has been developed from silver sea bream liver in order to assess the changes in gene expression of MT and G6PDH in hepatocytes directly exposed to Cd2+ in vitro. The sea bream metallothionein gene was cloned and characterized for the development of realtime PCR assays for quantification of MT transcript abundance. G6PDH gene expression was quantified using a real-time PCR assay developed using sequence information from a previously cloned silver sea bream G6PDH gene. In both in vivo and in vitro experiments, MT mRNA was highly inducible following Cd2+ treatment. In addition, Cd2+ exposure caused the upregulation of G6PDH mRNA expression and this suggests the possibility of the involvement of G6PDH in the defense against Cd2+-induced oxidative stress in cells. It is likely that the defense system of silver sea bream to Cd2+ stress includes upregulation of G6PDH in addition to metallothionein. (C) 2008 Elsevier B.V. All rights reserved.
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