闫月明,
方展强^,
华南师范大学生命科学学院 广东省高等学校生态与环境科学重点实验室, 广州 510631

作者简介: 闫月明(1986-),男,硕士,研究方向为水生动物生态毒理学,E-mail:Yanyueming198615@126.com.

通讯作者: 方展强,fangzhq@scnu.edu.cn

基金项目: 广东高校城市水环境生态治理与修复工程技术研究中心建设项目(No.2012gezxA004)


中图分类号: Q785;S917;X171.5

Effects of PCBs Exposure on CYP19α, VTGα Gene Expression and Morphological Masculinizing of Bone Morphogenesis in Mosquitofish (Gambusia affinis)

Yan Yueming,
Fang Zhanqiang^,
Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, College of Life Science, South China Normal University, Guangzhou 510631, China

Corresponding author: Fang Zhanqiang,fangzhq@scnu.edu.cn

CLC number: Q785;S917;X171.5

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摘要:应用食蚊鱼细胞色素P450芳香化酶基因(CYP19α)和卵黄蛋白原基因(VTGα) mRNA转录水平为指标，研究微量多氯联苯(PCBs)长时间暴露对成年雌性食蚊鱼CYP19α基因和VTGα基因表达的影响，并评价其对雌性食蚊鱼产生的形态雄性化效应。采用静水暴露实验模式，分别设置0.08、0.4、2和10 μg·L^-1 PCBs浓度，并设置对照组和平行组，定量测定14 d和28 d性腺CYP19α和肝脏VTGα mRNA表达水平的变化，以及对椎体脉棘发育的影响。暴露实验结果显示：①各PCBs浓度组(0.08、0.4、2和10 μg·L^-1 PCBs)暴露均能抑制食蚊鱼CYP19α和VTG基因的表达，表明PCBs对食蚊鱼VTGα基因的抑制远大于对食蚊鱼CYP19α基因的抑制；②0.4 μg·L^-1 PCBs暴露显著地降低了食蚊鱼第15椎体脉棘的长度并降低第15、16椎体脉棘的L/D值，显示食蚊鱼出现骨骼形态雄性化，表明一定浓度的PCBs暴露会表现出抗雌激素效应。
关键词: 多氯联苯(PCBs)/
食蚊鱼/
CYP19α/
VTGα/
mRNA表达/
椎体脉棘/
形态雄性化

Abstract:The cytochrome P450 aromatase (CYP19α) and vitellogenin (VTGα) genes mRNA transcriptional levels in mosquitofish (Gambusia affinis) were detected in order to investigate the effects of trace PCBs on the CYP19α and VTGα expression in the adult female G. affinis for long time exposure, and evaluate its effect on the morphological masculinization in female G. affinis. G. affinis were randomly divided into five groups, with one control group and four experimental groups (0.08, 0.4, 2 and 10 μg·L^-1 PCBs). Parallel experimental groups were also established. The CYP19α and VTGα mRNA expression levels in fish gonad and liver tissues were determined after 14 and 28 d exposure, respectively. The effect of PCBs on the development of hemal spine was also detected. The exposure experiment results showed that:① different concentrations of PCBs group (0.08, 0.4, 2 and 10 μg·L^-1 PCBs) exposure could inhibit the G. affinis CYP19α and VTGα gene expression, which suggested that the inhibition of PCBs on G. affinis VTGα gene was far greater than the inhibition of G. affinis CYP19α gene; ② 0.4 μg·L^-1 PCBs exposure significantly reduced the length (L) of 15th haemal spine, and reduced the L/D ratio of 15th and 16th haemal spine in G. affinis, which appeared masculinization of skeletal morphology. These showed that a certain concentration of PCBs exposure would show anti estrogen effect.
Key words:polychlorinated biphenyl (PCBs)/
Gambusia affinis/
CYP19α/
VTGα/
mRNA expression/
hemal spine/
morphological masculinization.