Parental exposure to microcystin-LR induced thyroid endocrine disruption in zebrafish offspring, a transgenerational toxicity

文献类型： 外文期刊

第一作者： Cheng, Houcheng

作者： Cheng, Houcheng;Wu, Qin;Liu, Chunsheng;Gong, Xiuying;Li, Guangyu;Cheng, Houcheng;Wu, Qin;Gong, Xiuying;Li, Guangyu;Yan, Wei;Hung, Tien-Chieh;Li, Guangyu;Li, Guangyu

作者机构：

关键词： MCLR;Transgenerational toxicity;Thyroid endocrine disruption;Zebrafish;Embryo

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

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年卷期：

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收录情况： SCI

摘要： Microcystin-LR is the most poisonous and commonly encountered hepatotoxin produced by cyanobacteria in an aquatic ecosystem, and it may cause thyroid dysfunction in fish. The present study aimed to reveal the effects of transgenerational toxicity of MCLR on the thyroid endocrine system under sub chronic exposure conditions. Adult zebrafish (FO) were exposed to environmentally relevant concentrations (1, 5 and 25 mu g/L) of MCLR for 45 days. The produced F1 embryos were then tested without further MCLR treatment. In the FO generation, exposure to 25 mu g/L MCLR reduced thyroxine (T4) but not 3, 5, 3'-triiodothyronine (T3) levels in females, while the T4 and T3 levels were unchanged in males. After parental exposure to MCLR, we observed a decreased hatching and growth retardation correlated with reduced thyroid hormone levels in the F1 offspring. The gene transcription and protein expression along the hypothalamic-pituitary-thyroid axis were detected to further investigate the possible mechanisms of MCLR-induced thyroid disruption. Our results indicated MCLR could disturb the thyroid endocrine system under environmentally relevant concentrations and the disrupting effects could be remarkably transmitted to its F1 offspring. We regard these adverse effects as a parental transgenerational toxicity of MCLR. (C) 2017 Elsevier Ltd. All rights reserved.

分类号： X5

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