在使用Geant4-DNA的向放射治疗中,细胞移位对DNA损伤的影响
Ali Azizi Ganjgah1, Payvand Taherparvar2
1Faculty of Science, Department of Physics, University of Guilan, Namjoo Avenue, P.O. Box 41635 - 1914, Rasht, 4193833697, Iran.
Scientific reports
|December 2, 2024
概括
像201Tl和99mTc这样的放射性核素的增强电子 (AEs) 会在向的癌细胞中引起DNA损伤. 这项研究量化了AEs的DNA断裂,有助于向放射治疗的开发.
科学领域:
- 生物物理学的生物物理.
- 放射化学 放射化学是指辐射化学.
- 医学物理 医学物理
背景情况:
- 带电粒子辐射,包括奥格尔电子 (AEs),诱导细胞中的DNA损伤 (单链断裂[SSB]和双链断裂[DSB]).
- AE的射程很短,允许有针对性的细胞破坏,同时节省附近的健康组织,使它们成为有针对性的放射治疗的前景.
- 了解各种Auger电子发射 (AEE) 放射性核酸所引起的精确DNA损伤对于优化癌症治疗策略至关重要.
研究的目的:
- 模拟和量化常用AEE放射性核素引起的直接和间接DNA损伤 (SSB,DSB,混合DSB).
- 研究分布在细胞模型 (C) 中的AEE放射性核酸对自身和附近细胞 (C2) 的生物学影响.
- 通过分析细胞间不同距离 (0-5μm) 的DNA损伤来评估AEE放射性核酸在向放射治疗中的潜力.
主要方法:
- 利用Geant4-DNA蒙特卡罗 (MC) 模拟工具包,模拟两个球形细胞 (C和C2) 和它们的核由液态水组成.
- 在细胞核中纳入原子DNA模型以模拟辐射相互作用.
- 计算了在C细胞中分布的99mTc,111In,123I,125I和201Tl诱导的SSB,DSB和混合DSB的数量,考虑到距离C2细胞的距离.
主要成果:
- 对于目标细胞C,DNA损伤影响顺序为201Tl > 125I > 123I > 111In > 99mTc.
- 对于相邻的细胞C2 (0-5μm距离),DNA损伤冲击顺序为99mTc > 123I > 111In > 201Tl > 125I.
- 基于放射性核素和细胞附近的差异性DNA损伤诱导,突出了放射性核素选择和分布的重要性.
结论:
- 该研究量化了各种AEE放射性核素对DNA的损伤,为在向放射治疗中选择最佳同位素提供了必要的数据.
- 结果表明,AEE放射性核酸在引起DNA损伤方面的有效性因目标细胞及其与源头的距离而异.
- 这项研究支持使用AEE放射性核素用于精确的癌症治疗的潜力,最大限度地减少对健康组织的附带损害.
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