暴露于聚乙烯纳米颗粒会导致Caco-2细胞中DNA修复机制的功能障碍
Agata Kustra1, Mirosław Zając1, Piotr Bednarczyk1
1Department of Physics and Biophysics, Institute of Biology, Warsaw University of Life Sciences- SGGW, Warsaw, Poland.
Biological research
|July 11, 2025
概括
纳米塑料诱导氧化应激并损害人类肠道细胞中的DNA修复基因表达,引发了对环境暴露导致基因组不稳定性的担忧.
科学领域:
- 环境健康 环境健康
- 分子毒理学 分子毒理学
- 细胞生物学 细胞生物学
背景情况:
- 越来越多的证据将纳米塑料暴露与不良健康影响联系在一起,特别是在人类胃肠道细胞中.
- 聚乙烯纳米颗粒 (PNPs) 是常见的环境污染物,其细胞影响在很大程度上是未知的.
研究的目的:
- 研究聚烯纳米颗粒 (PNPs) 对人类结直肠腺癌 (Caco-2) 细胞的影响.
- 评估PNP对细胞过程,DNA损伤和DNA损伤反应 (DDR) 途径的影响.
主要方法:
- 卡科-2细胞暴露在不同度的PNP中.
- 评估了细胞毒性,活性氧物种 (ROS) 水平,亡,DNA损伤 (彗星测定,γH2AX染色) 和DDR基因表达.
主要成果:
- PNPs没有直接诱导DNA链断裂 (SSB或DSB).
- PNPs引起氧化应激并改变了DDR基因表达.
- 基切除修复 (BER) 和双链断裂修复中的关键基因被降低了调控.
结论:
- 纳米塑料对肠道屏障细胞产生次致命作用.
- 缺陷的DNA修复机制可能导致基因组不稳定.
- 突出了与纳米塑料环境暴露相关的潜在长期健康风险.
相关概念视频
01:38Nucleotide Excision Repair
3.8K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
3.8K
02:37DNA Damage can Stall the Cell Cycle
9.3K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.3K
02:37DNA Damage Can Stall the Cell Cycle
2.7K
2.7K