二氧化纳米颗粒通过TM4细胞中的ROS-Ca2+-p38/AKT/mTOR通路诱导细胞亡
Qianqian Wang1, Yaqian Yang2, Pengfei Li1
1Department of Preventive Medicine/the Key Laboratory for Prevention and Control of Emerging Infectious Diseases and Public Health Security, the Xinjiang Production and Construction Corps, School of Medicine, Shihezi University, Shihezi, China.
Journal of applied toxicology : JAT
|January 25, 2024
概括
二氧化纳米颗粒 (TiO2 NPs) 通过增加活性氧物种 (ROS) 和 (Ca2+) 水平,诱导TM4细胞的亡. 这种过量的激活了p38/AKT/mTOR通路,导致细胞死亡.
科学领域:
- 纳米技术 纳米技术
- 细胞生物学 细胞生物学
- 毒理学 毒理学 毒理学
背景情况:
- 二氧化纳米颗粒 (TiO2NP) 广泛使用,但它们的细胞毒性机制,特别是TM4细胞中的亡诱导,需要进一步阐明.
- 了解活性氧物种 (ROS) 和细胞内 (Ca2+) 在TiO2 NP诱导的亡中的作用,对于风险评估至关重要.
研究的目的:
- 研究TiO2NP对ROS,Ca2+水平,p38/AKT/mTOR通路和TM4细胞的亡的影响.
- 评估Ca2+在调解p38/AKT/mTOR通路和由TiO2NP诱导的亡中的特定作用.
主要方法:
- 在24小时内,TM4细胞被暴露在不同度的TiO2NP (0-200μg/mL) 中.
- 进行了测试,以测量细胞活力,ROS产量,Ca2+水平,Ca2+-ATPase活性,p38/AKT/mTOR通路蛋白质和细胞亡标志物.
- 使用ROS清除器 (NAC) 和Ca2+化器 (BAPTA-AM) 来探测机械路径.
主要成果:
- TiO2 NPs降低了细胞活力,增加了ROS和Ca2+水平,并降低了Ca2+-ATPase活性.
- TiO2 NPs通过增加p-p38和减少p-AKT和p-mTOR来调节p38/AKT/mTOR通路.
- NAC减弱了TiO2 NP诱导的Ca2+过载,而BAPTA-AM缓解了通路失调和亡.
结论:
- TiO2 NPs主要通过ROS介导的细胞内Ca2+水平升高来诱导TM4细胞的亡.
- 增加的Ca2+随后调节了p38/AKT/mTOR通路,最终导致了亡.
- 这项研究提供了对TM4细胞中TiO2 NP诱导的亡的机制性理解,突出了Ca2+依赖途径的关键作用.
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