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首页> 外文期刊>Environmental Science & Technology >Common Pattern of Gene Expression in Response to Hypoxia or Cadmium in the Gills of the European Glass Eel (Anguilla anguilla)
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Common Pattern of Gene Expression in Response to Hypoxia or Cadmium in the Gills of the European Glass Eel (Anguilla anguilla)

机译：欧洲玻璃鳗the（Anguilla anguilla）the缺氧或镉反应基因表达的常见模式

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摘要

European eel (Anguilla anguilla) populations are in decline. Glass eel recruitment has fallen 10-fold since the early 1980s. Estuaries play a fundamental role in the life history of eels because glass eels must pass through them to reach freshwater ecosystems. Unfortunately, because of their geographical position at the upstream basin slopes, estuaries accumulate metals like cadmium and are important sites of hypoxia events. In this context, we studied the effect of the oxygen level on the ventilation of the glass eel. In parallel, glass eels were submitted to different dissolved cadmium concentrations (0, 2, and 10 μg L~(-1)) under two oxygen levels (normoxia Po_2 — 21 kPa and Hypoxia Po_2 = 6 kPa). The expression level of various genes involved in the mitochondrial respiratory chain, in the cellular response to metal and oxidative stresses, was investigated. Our results showed that hypoxia enhances (1) ventilation of the postlarval stage and (2) Cd accumulation in gills only at the lowest metal water concentration tested (2 μg Cd L~(-1)). At the gene level, Cd exposure mimics the effect of hypoxia since we observed a decrease in expression of genes involved in the respiratory chain and in the defense against oxidative stress.
机译：欧洲鳗鱼（安圭拉安圭拉）的数量正在减少。自1980年代初以来，玻璃鳗的招募人数下降了10倍。河口在鳗鱼的生活史中起着至关重要的作用，因为玻璃鳗必须通过它们才能到达淡水生态系统。不幸的是，由于其在上游盆地斜坡的地理位置，河口会积聚镉等金属，并且是缺氧事件的重要地点。在这种情况下，我们研究了氧气水平对玻璃鳗通风的影响。平行地，在两个氧气水平（常氧Po_2-21 kPa和低氧Po_2 = 6 kPa）下，将玻璃鳗接受不同的溶解镉浓度（0、2和10μgL〜（-1））。研究了细胞对金属和氧化应激的反应中，线粒体呼吸链中各种基因的表达水平。我们的结果表明，仅在最低的金属水浓度（2μgCd L〜（-1））下，低氧会增强（1）仔鱼后阶段的通气和（2）C中的Cd积累。在基因水平上，Cd暴露模拟了缺氧的影响，因为我们观察到呼吸链和抗氧化应激的基因表达减少。

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