perfluorooctanoic 酸通过甲状腺细胞中的 TSH-TSHR 信号通路破坏甲状腺特异性基因表达和调节
Yatao Du1, Chaojie Chen2, Guangdi Zhou1
1Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200292, China.
Environmental research
|October 12, 2023
概括
perfluorooctanoic 酸 (PFOA) 通过干扰TSH激活的cAMP通路来破坏甲状腺功能,影响关键基因和TSHR调节. 这种机制可能有助于降低甲状腺素水平,提供潜在的干预目标.
科学领域:
- 环境毒理学环境毒理学
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
背景情况:
- perfluorooctanoic 酸 (PFOA) 是一种持久性环境污染物,因其内分泌干扰作用而闻名.
- 以前的研究表明,PFOA会影响甲状腺功能,但甲状腺素降低的确切机制尚不清楚.
研究的目的:
- 研究PFOA影响甲状腺激素合成和调节的分子机制.
- 阐明PFOA对大鼠甲状腺毛囊细胞 (FRTL-5) 中的TSH激活的cAMP信号通路的影响.
主要方法:
- 利用FRTL-5细胞作为模型系统来评估PFOA对甲状腺相关基因的毒性.
- 研究了PFOA对循环腺单酸盐 (cAMP) - 响应元素结合蛋白 (CREB) 化,基因转录 (PAX8,TF1,NIS,TG,TPO,TSHR) 和TSH受体 (TSHR) N-糖化的影响.
- 评估PFOA暴露后的内质网膜 (ER) 应力和ER质量.
主要成果:
- PFOA干扰了TSH诱导的CREB酸化,并减少了关键甲状腺激素合成基因 (PAX8,TTF1,NIS,TG,TPO) 的转录.
- PFOA降低了TSH受体 (TSHR) 的mRNA水平,并损害了其N-糖化,影响了转录和后翻译调节.
- 暴露于PFOA导致FRTL-5细胞中ER应激增加和ER质量减少.
结论:
- 通过抑制TSHR表达和N-糖化,PFOA破坏了TSH激活的cAMP信号通路.
- 这种TSHR功能和下游信号的破坏有助于减少PFOA暴露时观察到的甲状腺激素水平.
- 这些发现为PFOA的甲状腺破坏机制提供了洞察力,并建议潜在的目标来抵消其影响.
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