在空气-液体接口暴露于整个汽油发动机尾气后,BEAS-2B细胞中的DNA和染色体损伤
Mengjuan Pei1, Yu Jin1, Tao Yu1
1National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing, China.
Journal of applied toxicology : JAT
|August 11, 2025
概括
汽油发动机排气 (GEE) 在人类肺细胞中引起DNA和染色体损伤. 这项研究表明,暴露于GEE显著损害了细胞活力和遗传物质,突出了潜在的致癌风险.
科学领域:
- 环境健康 环境健康
- 毒理学 毒理学 毒理学
- 细胞生物学 细胞生物学
背景情况:
- 全组件汽油发动机废气 (GEE) 是人类潜在的致癌物.
- DNA和染色体损伤与GEE的致癌性有关.
- 人类支气管上皮细胞BEAS-2B是研究呼吸道暴露效应的相关模型.
研究的目的:
- 评估暴露于GEE的BEAS-2B细胞中的DNA和染色体损伤.
- 评估GEE对细胞活力和关键DNA损伤标记物的影响.
- 研究γ-H2AX在细胞对GEE的反应中的作用.
主要方法:
- 空气-液体接口 (ALI) 暴露系统用于GEE.
- 细胞计数工具-8 (CCK-8) 测试细胞活力.
- 性彗星对DNA损伤的测定 (TailDNA%).
- 西方Blotting用于γ-H2AX蛋白质表达.
- 细胞动力阻断微核 (CBMN) 测定染色体损伤 (MN,NPB,NBUD).
主要成果:
- 从1:10稀释开始,GEE暴露降低了BEAS-2B细胞活力.
- 从1:10 GEE稀释中观察到显著的DNA损伤 (增加尾巴DNA%).
- 染色体损伤 (增加MN,NPB,NBUD) 和核分裂指数 (NDI) 的降低是剂量依赖的.
- γ-H2AX显示出初始增加,然后减少的非显著趋势,这表明它在DNA修复中的作用.
结论:
- 暴露于GEE会在人类支气管上皮细胞中引起显著的DNA和染色体损伤.
- 观察到的损害表明与GEE相关的潜在致癌风险.
- γ-H2AX可能参与了GEE暴露后的DNA修复机制,这需要进一步研究.
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