低剂量的质子诱导了带状皮质的遗传改变,并降低了其在行为中的相关认知功能
Gyutae Kim1, Hyelim Park1, Kyu-Sung Kim1,2
1Research Institute for Aerospace Medicine, Inha University, Incheon, Republic of Korea.
Frontiers in behavioral neuroscience
|March 25, 2025
概括
低剂量的质子辐射在小鼠大脑中引起了暂时的遗传变化,对认知行为产生延迟,有限的影响. 这些发现对于宇航员健康和临床质子使用法规至关重要.
科学领域:
- 神经科学是一个神经科学.
- 辐射生物学 辐射生物学
- 毒理学 毒理学 毒理学
背景情况:
- 环境辐射,特别是低剂量质子暴露,对中枢神经系统 (CNS) 构成潜在的健康风险.
- 之前的研究表明,质子辐射对认知有威胁,但对低剂量的不一致行为反应使得效果难以捉摸.
- 了解低剂量辐射的长期影响对于管理临床和空间环境中的健康风险至关重要.
研究的目的:
- 研究由中枢神经系统中低剂量质子辐射引起的功能变化.
- 在小鼠模型中评估对低剂量质子暴露的遗传和行为反应.
- 为了确定基因变化和辐射后的行为变化之间的时间关系.
主要方法:
- 54只雄性C57BL/6小鼠接受了低剂量的质子辐射.
- 通过测量基因表达,对关键认知区域带状皮质 (CC) 的遗传影响进行了评估.
- 在辐射后的不同时间点使用开放场测试 (OFT) 和辐射迷宫测试 (RMT) 评估行为反应.
主要成果:
- 在辐射后4周观察到峰值的炎症遗传反应 (HSPA,GFAP,MBP,NEFL,NEFM),在3个月内消失.
- 在OFT4周后,运动距离和速度显著下降,这表明运动功能发生了变化.
- 在辐射迷宫测试中没有发现显著的行为差异,这表明特定的认知功能受到影响较小.
结论:
- 低剂量的质子辐射会诱导与认知相关的大脑区域的可逆遗传变化.
- 观察到的延迟行为影响是有限的,并且取决于正在评估的特定认知功能.
- 这些发现为制定宇航员健康规则和指导质子疗法的临床应用提供了必要的数据.
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