低剂量CT辐射对基因表达和DNA完整性的影响
Nikolai Schmid1, Vadim Gorte2, Michael Akers3
1Bundeswehr Institute of Radiobiology affiliated to Ulm University, Neuherbergstr. 11, 80937 Munich, Germany.
International journal of molecular sciences
|December 30, 2025
概括
计算机断层扫描 (CT) 扫描使患者暴露在低剂量的辐射中. 血液细胞中的转录生物标志物表现出敏感的,剂量依赖的反应,表明它们作为医学成像辐射暴露的生物测量工具的潜力.
科学领域:
- 医疗成像医学成像
- 辐射生物学 辐射生物学
- 分子诊断学 分子诊断学
背景情况:
- 计算机断层扫描 (CT) 是医学成像辐射暴露的主要来源.
- 评估低剂量辐射带来的风险具有挑战性,通常依赖于线性无值模型.
- 了解细胞对低剂量辐射的反应对于准确的风险评估至关重要.
研究的目的:
- 为了研究CT扫描后外围血液细胞中辐射诱导的转录和DNA损伤变化.
- 为了比较体内和体外血样化过程中的基因表达变化.
- 评估转录生物标志物的潜力,作为低剂量辐射暴露的生物测量工具.
主要方法:
- 从60名患者收集了CT扫描前后的周围全血.
- 使用qRT-PCR对辐射敏感基因的量化基因表达.
- 在一组患者中通过γ-H2AX + 53BP1焦点染色评估DNA双链断裂 (DSB).
主要成果:
- 在体内和体外化之间,差异性基因表达有显著的变化,体外化掩盖了真正的低剂量效应.
- 在体内样本显示了包括EDA2R,MIR34AHG,PHLDA3,DDB2,FDXR和AEN在内的基因的显著上调.
- 观察到几种基因的线性剂量依赖上调,其中AEN和FDXR显示出高解释差异.
- DSB的分析表明,暴露后的损伤略有增加,但不显著.
结论:
- 转录生物标志物是医学成像中低剂量辐射暴露的敏感指标.
- 在体内基因表达分析比体外更能反映实际辐射效应.
- 这些生物标志物显示出作为临床适用的生物测量工具的前景,突出显示了CT扫描中剂量优化的必要性.
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