文章摘要
陈春亮,马胜伟,王学锋.汞、镉离子急性污染对紫红笛鲷肝脏金属硫蛋白的胁迫效应[J].农业环境科学学报,2014,33(8):1493-1499.
汞、镉离子急性污染对紫红笛鲷肝脏金属硫蛋白的胁迫效应
Acute Effects of Hg2+ and Cd2+ Pollution on Metallothionein in Hepatic Tissues of Lutjanus argentimaculatus
  
DOI:10.11654/jaes.2014.08.005
中文关键词: 紫红笛鲷  生物标志物  金属硫蛋白    
英文关键词: Lutjanus argentimaculatus  biomarker  metallothionein(MT)  mercury  cadmium
基金项目:
作者单位
陈春亮 广东海洋大学海洋资源与环境监测中心 广东 湛江 524088 
马胜伟 中国水产科学研究院南海水产研究所 广东省渔业生态环境重点实验室 广州 510300 
王学锋 广东海洋大学水产学院 广东 湛江 524088 
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中文摘要:
      为分析水体中Hg2+、Cd2+急性污染对鱼体肝脏金属硫蛋白(MT)的胁迫效应,筛选其适宜的生物标志物,通过Hg2+(0.5、1、10 μg·L-1)、Cd2+(5、10、100 μg·L-1)单一、混合暴露96 h半静水实验,采用生物素双抗体夹心酶联免疫吸附法测定了3、12、24、48、96 h时紫红笛鲷肝组织MT的含量。结果表明,96 h内紫红笛鲷肝脏中MT含量变化为:(1)单一暴露下,汞浓度组(0.5、1、10 μg·L-1 Hg2+)受诱导率分别为17.9%、43.7%、51.8%;镉浓度组(5、10、100 μg·L-1 Cd2+)受诱导率分别为4.3%、54.7%、84.9%。(2)Hg2+-Cd2+混合暴露下,Hg1Cd(0.5 μg·L-1 Hg2++10 μg·L-1 Cd2+)、Hg2Cd(1 μg·L-1 Hg2++10 μg·L-1 Cd2+)、Hg3Cd(10 μg·L-1 Hg2++10 μg·L-1 Cd2+)三个浓度组对鱼肝脏MT的诱导率均值依次为22.8%、26.3%、51.7%;Cd1Hg(5 μg·L-1 Cd2++1 μg·L-1 Hg2+)、Cd2Hg(10 μg·L-1 Cd2++1 μg·L-1 Hg2+)、Cd3Hg(100 μg·L-1 Cd2++1 μg·L-1 Hg2+)的平均诱导率分别为30.1%、26.4%、58.3%。单一、混合暴露下皆具有明显的时间-效应关系和剂量-效应关系,汞、镉离子污染物浓度的升高和暴露时间的延长,都导致鱼体肝脏MT含量显著增加;混合暴露浓度组的诱导率总体上低于单一暴露下的诱导率,反映出Hg2+-Cd2+混合状态下的拮抗作用。
英文摘要:
      Metallothionein(MT) plays important roles in binding and detoxifiying heavy metals. However, the responses of MT to acute pollution of Hg2+and Cd2+ in water have not been clear yet. In a semi-static experiment, the levels of MT in the hepatic tissues of Lutjanus argentimaculatus were determined with enzyme-linked binding assay(ELBA) under single and combined exposure to different concentrations of Hg2+ and Cd2+ at 3, 12, 24, 48, 96 h. Under exposure to single metal, the levels of MT were increased by 17.9%, 43.7% and 51.8% at 0.5, 1, 10 μg Hg·L-1, and by 4.3%, 54.7%, 84.9% at 5, 10, 100 μg Cd·L-1, respectively. Mixed exposure of Hg-Cd promoted MT levels by 22.8%,26.3%, 51.7% for Hg1Cd(0.5 μg·L-1 Hg2++10 μg·L-1 Cd2+),Hg2Cd(1 μg·L-1 Hg2++10 μg·L-1 Cd2+),Hg3Cd(10 μg·L-1 Hg2++10 μg·L-1 Cd2+), and by 30.1%,26.4%, 58.3% for Cd1Hg(5 μg·L-1 Cd2++1 μg·L-1 Hg2+), Cd2Hg(10 μg·L-1 Cd2++1 μg·L-1 Hg2+), Cd3Hg(100 μg·L-1 Cd2++1 μg·L-1 Hg2+), respectively. In conclusion, both single and mixed exposure of Hg2+ and Cd2+ increase MT levels in the hepatic tissues, with obvious time-response and dose-response. The induction of MT is lower in the mixed treatments than in their corresponding single ones, indicating the antagonism of Hg2+ and Cd2+.
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