在体外和体内对甲状腺激素系统特异性与三醇相互作用的研究
Asya Kadic1, Patricia Oles2, Benjamin Christian Fischer1
1Department of Pesticides Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str. 8-10, 10589, Berlin, Germany.
Scientific reports
|March 19, 2024
概括
化学物质可以通过诱导肝脏排毒来破坏甲状腺激素 (TH),从而导致TH消除. 这项研究发现杀菌剂并没有直接影响TH通路,这表明肝结合是破坏的主要机制.
科学领域:
- 内分泌学 在内分泌学.
- 毒理学 毒理学 毒理学
- 环境健康 环境健康
背景情况:
- 甲状腺激素 (TH) 对于生长,新陈代谢和发育至关重要.
- 化学物质可以破坏TH平衡,作为内分泌干扰剂 (EDs).
- 一个常见的机制涉及肝脏 (肝脏) 排毒酶的诱导,增加TH的消除.
研究的目的:
- 研究杀菌剂 (cyproconazole,epoxiconazole,prochloraz) 对甲状腺激素系统的影响.
- 为了确定这些杀菌剂是否与特定的甲状腺激素通路相互作用,或者主要通过肝结合作用.
- 为了阐明杀剂诱导的TH失调的作用模式 (MoA).
主要方法:
- 在小鼠中进行的短期饮食暴露研究.
- 在体外测试中评估甲状腺吸收 (NIS),TH运输 (MCT8),甲状腺过氧化酶 (TPO) 活性和神酶 (DIO1-3,DEHAL1) 功能.
- 在老鼠和肝脏中测量Dio1和Dehal1活动.
主要成果:
- 在大鼠中,杀菌剂暴露导致肝细胞缩,肝脏UGT活性增加,并诱导1/2期基因表达.
- 观察到TH水平的变化和甲状腺毛囊细胞增大/增多.
- 在体外和体外测定没有显示杀菌剂对TH特异性关键事件 (KEs) 的直接影响.
结论:
- 测试的杀菌剂没有直接干扰甲状腺激素通路.
- 肝结合和随后的TH消除似乎是这些杀菌剂的主要作用方式.
- 这凸显了在评估内分泌干扰潜力时考虑代谢途径的重要性.
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