SiO2纳米颗粒破坏人类中脑器官中的神经发育过程,以氧化还原抑制,非细胞毒性的方式
Seohyun Kim1, Youngsun Lee1, Hyang-Ae Lee2
1Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea; KRIBB School of Bioscience, University of Science and Technology, Daejeon 34113, Republic of Korea.
Journal of hazardous materials
|December 4, 2025
概括
二氧化纳米颗粒 (SiO2-NPs) 通过损害多巴胺基神经元成熟,破坏人类早期大脑发育. 这些效应在没有细胞死亡的情况下发生,这表明从纳米粒子暴露中产生发育神经毒性的新机制.
科学领域:
- 发育神经毒性 发育神经毒性
- 纳米颗粒的毒理学
- 干细胞生物学 干细胞生物学
背景情况:
- 二氧化纳米颗粒 (SiO2-NPs) 在消费品中普遍存在,可以穿过胎盘屏障.
- 之前的研究表明SiO2-NP会在成年组织中引起细胞毒性和氧化损伤.
- SiO2-NPs对早期人类神经发育,特别是多巴胺系统的影响尚不清楚.
研究的目的:
- 为了研究SiO2-NP对人类中脑器官 (mBO) 在多巴胺基基谱系形成期间的影响.
- 在关键的发育窗口中阐明SiO2-NP诱导的神经发育变化的潜在机制.
主要方法:
- 从多能干细胞生成人类中脑器官 (mBO).
- 在多巴胺基分化阶段,MBO暴露于SiO2-NPs.
- 评估有机体生长,原生细胞增殖,多巴胺基标记物,神经元群体,亡,活性氧物种 (ROS),信号传递和炎症通路.
- 利用基酶分析和RNA测序进行深入的分子分析.
主要成果:
- SiO2-NP暴露减少了mBO的生长,抑制了神经前体的增殖,并降低了多巴胺基标记物的调节.
- 总体而言,神经元群体保持不变,并没有观察到细胞亡.
- 关键发现包括细胞内ROS减少,信号受损以及星球细胞和炎症通路的激活.
- 分子分析揭示了抑制的和氧化还原依赖信号,以及代谢和炎症重编程.
结论:
- SiO2-NPs通过非细胞毒性,氧化还原抑制机制诱导发育神经毒性.
- 在关键的神经发育窗口期间的暴露会扰乱神经元的成熟和连接.
- 突出了人类中脑发育过程中对纳米粒子暴露的脆弱性,影响了多巴胺系统的形成.
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