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Developmental toxicity of trichloroethylene in zebrafish (Danio rerio).
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2020-01-23 , DOI: 10.1039/c9em00565j
Katharine A Horzmann 1 , Ana M Portales , Kathryn G Batcho , Jennifer L Freeman
Affiliation  

Trichloroethylene (TCE), an industrial solvent and degreaser, is an environmental toxicant that contaminates over half of Superfund sites, is a known carcinogen, and is linked to congenital defects and neurodegenerative disease. The developmental toxicity of TCE near ecologically relevant levels needs further characterization in order to better assess health risks of exposure. In this study, the toxicodynamics of TCE in the zebrafish (Danio rerio) model was investigated through the establishment of a LC50 concentration and by monitoring the acute developmental toxicity of ecologically relevant concentrations (0, 5, 50, and 500 parts per billion; ppb) of TCE during two different exposure lengths (1-72 hours post fertilization (hpf) and 1-120 hpf). Acute developmental toxicity was assessed by monitoring survival and hatching, larval morphology, larval heart rate, and behavioral responses during an embryonic photomotor response test and a larval visual motor response test. Embryonic exposure to TCE was associated with decreased percent hatch at 48 hpf, altered larval morphology, increased heart rate, and altered behavioral responses during the photomotor response test and visual motor response test. Larval morphology and behavioral alterations were more pronounced in the 1-120 hpf exposure length trials. The observed alterations suggest developmental TCE toxicity is still a concern at regulatory concentrations and that timing of exposure influences developmental toxicity.

中文翻译:

三氯乙烯在斑马鱼中的发育毒性(Danio rerio)。

三氯乙烯(TCE)是一种工业溶剂和脱脂剂,是一种环境毒物,污染了Superfund网站的一半以上,是已知的致癌物,与先天性缺陷和神经退行性疾病有关。TCE在生态上相关水平附近的发育毒性需要进一步表征,以便更好地评估暴露的健康风险。在这项研究中,通过建立LC50浓度并监测生态相关浓度(十亿分之0、5、50和500 pp; ppb)的急性发育毒性,研究了TCE在斑马鱼(Danio rerio)模型中的毒性动力学。 TCE)在两种不同的暴露时间(受精后1-72小时(hpf)和1-120 hpf)之间。通过监测存活率和孵化率,幼虫形态,幼虫心率,以及胚胎光动力反应测试和幼虫视觉运动反应测试期间的行为反应。胚胎暴露于TCE与48 hpf孵化率降低,幼虫形态改变,心率增加以及光运动反应测试和视觉运动反应测试中行为反应的改变有关。在1-120 hpf暴露时间试验中,幼虫的形态和行为改变更为明显。观察到的变化表明,在调节浓度下,发育中的TCE毒性仍是一个问题,接触时间会影响发育毒性。在光运动反应测试和视觉运动反应测试期间,幼虫的形态发生了变化,心率增加,行为反应也发生了变化。在1-120 hpf暴露时间试验中,幼虫的形态和行为改变更为明显。观察到的变化表明,在调节浓度下,发育中的TCE毒性仍是一个问题,接触时间会影响发育毒性。在光运动反应测试和视觉运动反应测试期间,幼虫的形态发生了变化,心率增加,行为反应也发生了变化。在1-120 hpf暴露时间试验中,幼虫的形态和行为改变更为明显。观察到的变化表明,在调节浓度下,发育中的TCE毒性仍是一个问题,接触时间会影响发育毒性。
更新日期:2020-01-23
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