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Analysis of metallotionein expression and antioxidant enzyme activities in Meretrix meretrix larvae under sublethal cadmium exposure
Wang, Qing1,3; Wang, Xiaomei2; Wang, Xiaoyu1,4; Yang, Hongsheng1; Liu, Baozhong2
2010-11-15
Source PublicationAQUATIC TOXICOLOGY
Volume100Issue:4Pages:321-328
SubtypeArticle
AbstractTo investigate the possible role of metallothioneins (MTs) and antioxidant enzymes in cadmium (Cd) tolerance in Meretrix meretrix larvae, a new MT (designated MmMT) gene was identified and cloned from M. meretrix. The full-length cDNA of MmMT consisted of an open reading frame (ORF) of 231 bp encoding a protein of 76 amino acids, with 21 cysteine residues and a conserved structural pattern Cys-x-Cys-x(3)-Cys-Tyr-Gly-x(3)-Cys-x-Cys-x(3)-CYs-x-Cys-Lys at the C-terminus. The deduced amino acid sequence of MmMT showed about 57-84% identity with previously published MT sequences of mussels and oysters. Real-time PCR was used to analyze the expression level of MmMT mRNA at different M. meretrix larval stages under Cd exposure (25 mu g L(-1)). Results showed that Cd could induce the expression of MmMT mRNA in the larvae, and the expression level increased 5.04-fold and 3.99-fold in D-shaped larvae and pediveligers, respectively. Immunolocalization of MmMT in the stressed larvae revealed that MmMT was synthesized in almost all of the soft parts at the trochophore and postlarva stages, whereas it was only synthesized in the velum and epidermis at the D-shaped larva and pediveliger stages. The activities of three antioxidant enzymes, superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx), also were measured in larvae at different developmental stages. Increased enzymatic activities were detected mainly in D-shaped larvae and pediveligers under Cd stress, suggesting that these enzymes respond synchronously with MT. Our results indicate that MmMT and antioxidant enzymes played important roles in counteracting Cd stress in M. meretrix larvae. (C) 2010 Elsevier B.V. All rights reserved.
KeywordMetallothionein Cadmium Larvae Antioxidant Enzyme Bivalve Meretrix Meretrix
DOI10.1016/j.aquatox.2010.08.012
Indexed BySCI
Language英语
WOS IDWOS:000284787200003
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/32831
Collection海洋生态与环境科学重点实验室
实验海洋生物学重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Key Lab Expt Marine Biol, Qingdao 266071, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.Hebei Univ Technol, Minist Educ, Engn Res Ctr Seawater Utilizat Technol, Tianjin 300130, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang, Qing,Wang, Xiaomei,Wang, Xiaoyu,et al. Analysis of metallotionein expression and antioxidant enzyme activities in Meretrix meretrix larvae under sublethal cadmium exposure[J]. AQUATIC TOXICOLOGY,2010,100(4):321-328.
APA Wang, Qing,Wang, Xiaomei,Wang, Xiaoyu,Yang, Hongsheng,&Liu, Baozhong.(2010).Analysis of metallotionein expression and antioxidant enzyme activities in Meretrix meretrix larvae under sublethal cadmium exposure.AQUATIC TOXICOLOGY,100(4),321-328.
MLA Wang, Qing,et al."Analysis of metallotionein expression and antioxidant enzyme activities in Meretrix meretrix larvae under sublethal cadmium exposure".AQUATIC TOXICOLOGY 100.4(2010):321-328.
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