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首页> 外文期刊>Environmental Science & Technology >Biodynamics To Explain The Difference Of Copper Body Concentrations In Five Marine Bivalve Species
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Biodynamics To Explain The Difference Of Copper Body Concentrations In Five Marine Bivalve Species

机译：生物动力学解释五种海洋双壳类动物体内铜体浓度的差异

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Copper is an essential metal for organisms but can be toxic when high intake occurs. The interspecific and intraspecific differences in concentrations of Cu in the tissues of different bivalve species have been recognized but the underlying mechanisms leading to these differences remain speculative. In this study, the biokinetics of Cu, using ~(67)Cu as a radioactive tracer, was investigated in five species of marine bivalves, including scallops Chlamys nobilis, clams Ruditapes philippinarum, green mussels Perna viridis, black mussels Septifer virgatus, and oysters Saccostrea cucullata. All species have contrasting Cu concentrations in their bodies. Our results demonstrated the clear importance of biokinetics in controlling Cu concentrations in the bodies of bivalves. Assimilation efficiency (AE), feeding activity (filtration rate), and efflux rate all contributed to the observed interspecies differences. The AE and efflux rate were positively correlated with the respective Cu body burden, indicating their important roles in Cu concentrations in the body. The efflux rate also explained the intraspecies difference in Cu bioaccumulation. The subcellular distribution of Cu varied among different species of bivalves. There was a positive relationship between the newly accumulated Cu in the metallothionein-like protein (MTLP) fraction and the efflux rate, suggesting that MTLP may be responsible for Cu elimination and may control Cu regulation in bivalves. Calculations showed that the Cu partitioning coefficient and ingestion are important in determining the relative contribution of waterborne and dietborne exposure pathways to overall Cu accumulation. However, the dietary pathway was the most important source of Cu in bivalves under most circumstances.
机译：铜是生物体必不可少的金属，但是当大量摄入时，铜可能具有毒性。人们已经认识到不同双壳类动物组织中铜浓度的种间和种内差异，但导致这些差异的潜在机制仍是推测性的。在这项研究中，使用〜（67）Cu作为放射性示踪剂，在五种海洋双壳类动物中研究了Cu的生物动力学，这些物种包括扇贝，no，蛤，菲律宾蛤，绿贻贝，绿贻贝，黑贻贝Septifer virgatus和牡蛎。酵母（Saccostrea cucullata）。所有物种在其体内的铜浓度都不同。我们的结果证明了生物动力学在控制双壳类动物体内铜浓度中的重要性。同化效率（AE），摄食活性（过滤率）和外排率均导致观察到的种间差异。 AE和外排率与相应的Cu体负荷呈正相关，表明它们在体内Cu浓度中的重要作用。外排率也解释了铜内生物积累的种内差异。 Cu的亚细胞分布在双壳类的不同物种之间变化。在金属硫蛋白样蛋白（MTLP）组分中新积累的Cu与外排率之间存在正相关关系，表明MTLP可能负责消除铜并可能控制双壳类动物体内的Cu调节。计算表明，铜的分配系数和摄入量对于确定水和饮食接触途径对总体铜积累的相对贡献很重要。然而，在大多数情况下，饮食途径是双壳类动物中最重要的铜来源。

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  • 来源
    《Environmental Science & Technology》 |2009年第6期|2137-2143|共7页
  • 作者

    KE PAN; WEN-XIONG WANG;

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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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