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Subcellular partitioning profiles and metallothionein levels in indigenous clams Moerella iridescens from a metal-impacted coastal bay
Wang, Zaosheng; Feng, Chenglian; Ye, Chun; Wang, Youshao; Yan, Changzhou; Li, Rui; Yan, Yijun; Chi, Qiaoqiao; Wang, ZS; Yan, CZ (reprint author), Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Environm & Hlth, 1799 Jimei Blvd, Xiamen 361021, Peoples R China.
2016
Source PublicationAQUATIC TOXICOLOGY
Volume176Pages:2016-10-23
AbstractIn this study, the effect of environmental metal exposure on the accumulation and subcellular distribution of metals in the digestive gland of clams with special emphasis on metallothioneins (MTs) was investigated. Specimens of indigenous Moerella iridescens were collected from different natural habitats in Maluan Bay (China), characterized by varying levels of metal contamination. The digestive glands were excised, homogenized and six subcellular fractions were separated by differential centrifugation procedures and analyzed for their Cu, Zn, Cd and Pb contents. MTs were quantified independently by spectrophotometric measurements of thiols. Site-specific differences were observed in total metal concentrations in the tissues, correlating well with variable environmental metal concentrations and reflecting the gradient trends in metal contamination. Concentrations of the non-essential Cd and Pb were more responsive to environmental exposure gradients than were tissue concentrations of the essential metals, Cu and Zn. Subcellular partitioning profiles for Cu, Zn and Cd were relatively similar, with the heat-stable protein (HSP) fraction as the dominant metal-binding compartment, whereas for Pb this fraction was much less important. The variations in proportions and concentrations of metals in this fraction along with the metal bioaccumulation gradients suggested that the induced MTs play an important role in metal homeostasis and detoxification for M. iridescens in the metal-contaminated bay. Nevertheless, progressive accumulation of non-essential metals (Cd, and especially Pb) resulting from "spillover" was observed in putative metal- sensitive (e.g., mitochondria and heat-denaturable protein (HDP)) or lysosome/microsome fractions, demonstrating that metal detoxification was incomplete and increased the toxicological risk to M. iridescens inhabiting the metal-impacted environments. Through multiple step-wise regression analysis, the induction of MTs was statistically correlated with the HSP concentrations of Cu, and to a lesser extent with Zn, and ultimately to the Cd concentrations, exhibiting significant dose-dependent relationships. Overall, these findings not only revealed the fates of accumulated metals, but scientifically favored an improved understanding of the detoxification at the subcellular level in response to metal accumulation, supporting the focus of metabolic availability assessment on the intracellular processes or events occurring within organisms. (C) 2016 Elsevier B.V. All rights reserved.
Department[Wang, Zaosheng; Yan, Changzhou; Li, Rui; Yan, Yijun; Chi, Qiaoqiao] Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Environm & Hlth, 1799 Jimei Blvd, Xiamen 361021, Peoples R China; [Wang, Zaosheng; Feng, Chenglian; Ye, Chun] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China; [Wang, Youshao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China ; LTO
KeywordSubcellular Partitioning Heat-stable Protein Metallothioneins Metabolic Availability Biomonitor Organism
Subject AreaMarine & Freshwater Biology ; Toxicology
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15354
Collection热带海洋环境国家重点实验室(LTO)
Corresponding AuthorWang, ZS; Yan, CZ (reprint author), Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Environm & Hlth, 1799 Jimei Blvd, Xiamen 361021, Peoples R China.
Recommended Citation
GB/T 7714
Wang, Zaosheng,Feng, Chenglian,Ye, Chun,et al. Subcellular partitioning profiles and metallothionein levels in indigenous clams Moerella iridescens from a metal-impacted coastal bay[J]. AQUATIC TOXICOLOGY,2016,176:2016-10-23.
APA Wang, Zaosheng.,Feng, Chenglian.,Ye, Chun.,Wang, Youshao.,Yan, Changzhou.,...&Yan, CZ .(2016).Subcellular partitioning profiles and metallothionein levels in indigenous clams Moerella iridescens from a metal-impacted coastal bay.AQUATIC TOXICOLOGY,176,2016-10-23.
MLA Wang, Zaosheng,et al."Subcellular partitioning profiles and metallothionein levels in indigenous clams Moerella iridescens from a metal-impacted coastal bay".AQUATIC TOXICOLOGY 176(2016):2016-10-23.
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