Role of metallothionein against oxidative stress in the mussel Mytilus galloprovincialis

被引:177
作者
Viarengo, A
Burlando, B
Cavaletto, M
Marchi, B
Ponzano, E
Blasco, J
机构
[1] Univ Piemonte Orientale Amedeo Avogadro, Dept Sci & Adv Technol, I-15100 Alessandria, Italy
[2] Univ Genoa, Dipartimento Biol Gen Sperimentale & Ambiente, I-16132 Genoa, Italy
[3] CSIC, Inst Ciencias Marinas Andalucia, Puerto Real 11510, Spain
关键词
antioxidant defense system; cadmium; iron;
D O I
10.1152/ajpregu.1999.277.6.R1612
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Metallothionein (MT) is a sulfhydryl-rich protein involved mainly in heavy metal homeostasis and detoxification. In this study, the use of the mussel as an experimental model allowed us to test MT antioxidant properties at the molecular, cellular, and organism level. MT induction was achieved by mussel exposure to Cd (200 mu g/l) in aquaria for 7 days followed by detoxification in the sea for 28 days. Cd-preexposed and nonexposed mussels were then treated with Fe (300-600 mu g/l) in aquaria for 3 days. Biochemical assays on digestive gland tissue showed that treatment with Fe led to a significant increase in oxyradical production and malondialdehyde level only in mussels not preexposed to Cd. The Cd-dependent resistance to oxidative stress was ascribed to MT induction, as Cd produced no significant variation of reduced glutathione and major antioxidant enzymes. Digital imaging of isolated digestive gland cells showed lower oxyradical rise and higher viability in cells from Cd-preexposed mussels after treatments with 0.5-5 mM H2O2. Analyses on whole organisms showed that anoxic survival was lowered in mussels that had been treated with Fe, but such an effect was less pronounced in Cd-preexposed mussels compared with nonpreexposed ones. In conclusion, data suggest an antioxidant role for MT, which seems to occur through oxyradical scavenging and is able to protect both isolated cells and the entire organism from oxidative stress.
引用
收藏
页码:R1612 / R1619
页数:8
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