title: The developmental neurotoxicity of polybrominated diphenyl ethers: Effect of DE-71 on dopamine in zebrafish larvae.
abstract: The potential neurotoxicity of polybrominated diphenyl ethers (PBDEs) is still a great concern. In the present study, the authors investigated whether exposure to PBDEs could affect the neurotransmitter system and cause developmental neurotoxicity in zebrafish. Zebrafish embryos (2 h postfertilization) were exposed to different concentrations of the PBDE mixture DE-71 (0-100 μg/L). The larvae were harvested at 120 h postfertilization, and the impact on dopaminergic signaling was investigated. The results revealed significant reductions in content of whole-body dopamine and its metabolite, dihydroxyphenylacetic acid, in DE-71-exposed larvae. The transcription of genes involved in the development of dopaminergic neurons (e.g., manf, bdnf, and nr4a2b) was significantly downregulated upon exposure to DE-71. Also, DE-71 resulted in a significant decrease of tyrosine hydroxylase and dopamine transporter protein levels in dopaminergic neurons. The expression level of tyrosine hydroxylase in forebrain neurons was assessed by whole-mount immunofluorescence, and the results further demonstrated that the tyrosine hydroxylase protein expression level was reduced in dopaminergic neurons. In addition to these molecular changes, the authors observed reduced locomotor activity in DE-71-exposed larvae. Taken together, the results of the present study demonstrate that acute exposure to PBDEs can affect dopaminergic signaling by disrupting the synthesis and transportation of dopamine in zebrafish, thereby disrupting normal neurodevelopment. In accord with its experimental findings, the present study extends knowledge of the mechanisms governing PBDE-induced developmental neurotoxicity.
authors: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China; University of Chinese Academy of Sciences, Beijing, China.
authors: Xianfeng
authors: X
authors: Wang
authors: Lihua
authors: L
authors: Yang
authors: Yuanyuan
authors: Y
authors: Wu
authors: Changjiang
authors: C
authors: Huang
authors: Qiangwei
authors: Q
authors: Wang
authors: Jian
authors: J
authors: Han
authors: Yongyong
authors: Y
authors: Guo
authors: Xiongjie
authors: X
authors: Shi
authors: Bingsheng
authors: B
authors: Zhou
mesh_terms: D000818:Animals; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D004298:Dopamine / Q000032:analysis*; D055664:Electrochemical Techniques; D004625:Embryo, Nonmammalian / Q000187:drug effects / Q000378:metabolism; D047108:Embryonic Development / Q000187:drug effects; D055768:Halogenated Diphenyl Ethers / Q000032:analysis / Q000633:toxicity*; D009414:Nerve Growth Factors / Q000235:genetics / Q000378:metabolism; D009474:Neurons / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D011987:Receptors, Steroid / Q000235:genetics / Q000378:metabolism; D014446:Tyrosine 3-Monooxygenase / Q000378:metabolism; D015027:Zebrafish / Q000254:growth & development / Q000378:metabolism*; D029961:Zebrafish Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D055768:Halogenated Diphenyl Ethers; C576249:MANF protein, zebrafish; D009414:Nerve Growth Factors; D012333:RNA, Messenger; D011987:Receptors, Steroid; D029961:Zebrafish Proteins; C086401:pentabromodiphenyl ether; D014446:Tyrosine 3-Monooxygenase; D004298:Dopamine
keywords: Developing neurotoxicity; Dopaminergic neuron; Neurotransmitter; Polybrominated diphenyl ethers (PBDEs); Zebrafish larvae