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首页> 外文期刊>Environmental Science & Technology >Antagonistic Interaction of Mercury and Selenium in a Marine Fish Is Dependent on Their Chemical Species
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Antagonistic Interaction of Mercury and Selenium in a Marine Fish Is Dependent on Their Chemical Species

机译：海水鱼中汞和硒的拮抗作用取决于它们的化学种类

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摘要

It is well-known that selenium (Se) shows protective effects against mercury (Hg) bioaccumulation and toxicity, but the underlying effects of Se chemical species, concentration, and administration method are poorly known. In this study, we conducted laboratory studies on a marine fish Terapon jurbua to explain why Hg accumulation is reduced in the presence of Se observed in field studies. When Se and Hg were administrated concurrently in the fish diets, different Se species including selenite, selenate, seleno-DL-cystine (SeCys), and seleno-DL-methionine (SeMet) affected Hg bioaccumulation differently. At high concentration in fish diet (20 /ig g"1 normally), selenate and SeCys significantly reduced the dietary Hg(ll) assimilation efficiency (AE) from 38% to 26%. After the fish were pre-exposed to dietary selenite or SeMet (7 /ig g1 normally) for 22 days with significantly elevated Se body concentrations, the Hg(ll) AEs were pronouncedly reduced (from 41% to 15-26%), whereas the dissolved uptake rate constant and elimination rate constant were less affected. In contrast to Hg(Il), all the MeHg biokinetic parameters remained relatively constant whether Se was administrated simultaneously with the fish diet or when the fish were pre-exposed to Se with elevated body concentrations. Basic biokinetic measurements thus revealed that Se had direct interaction with Hg(ll) during dietary assimilation rather than with MeHg and that different Se species had variable effects on Hg assimilation.
机译：众所周知，硒对汞（Hg）的生物富集和毒性具有保护作用，但对硒的化学种类，浓度和给药方法的潜在作用却鲜为人知。在这项研究中，我们对海洋鱼类Terapon jurbua进行了实验室研究，以解释为什么在实地研究中观察到在存在硒的情况下汞的积累会减少。在鱼类饮食中同时施用硒和汞时，不同的硒物种（包括亚硒酸盐，硒酸盐，硒代DL-胱氨酸（SeCys）和硒代DL-蛋氨酸（SeMet））对汞的生物积累有不同的影响。在鱼饲料中高浓度（正常情况下为20 / ig g“ 1）时，硒酸盐和SeCys会显着降低饲料中Hg（II）的同化效率（AE）从38％降至26％。 SeMet（通常为7 / ig g1）连续22天，Se体内浓度显着升高，Hg（II）AEs显着降低（从41％降至15-26％），而溶解吸收速率常数和消除速率常数较小与Hg（II）相比，无论与鱼类饮食同时投予Se还是将鱼类预先暴露于体内浓度较高的Se中，所有MeHg的生物动力学参数都保持相对恒定，因此基本的生物动力学测量表明，Se具有在膳食同化过程中与Hg（II）直接相互作用，而不是与MeHg直接相互作用，并且不同的硒物种对Hg同化具有可变的影响。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.3116-3122|共7页
  • 作者

    Fei Dang; Wen-Xiong Wang;

  • 作者单位

    Division of Life Science, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong;

    Division of Life Science, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong;

  • 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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