在小鼠中,经过分成部分的全脑辐射后,功能网络失调和认知衰退
Benjamin A Seitzman1, Francisco J Reynoso1, Timothy J Mitchell1
1Department of Radiation Oncology, School of Medicine, Washington University in St. Louis, 4921 Parkview Place, Campus Box 8224, St. Louis, MO, 63110, USA.
GeroScience
|September 25, 2023
概括
对大脑的放射治疗会导致认知功能障碍,原因是人们不了解的机制. 这项研究使用了一种新的动物模型来揭示辐射如何影响神经和血液动力活动,随着时间的推移而恶化并影响特定的大脑区域.
科学领域:
- 神经科学是一个神经科学.
- 放射治疗研究 放射治疗研究
- 认知科学 认知科学
背景情况:
- 认知功能障碍是脑放射治疗 (RT) 的常见并发症,其机制不明确,没有有效的治疗方法.
- 目前的功能磁共振成像 (fMRI) 方法通过缓慢的血液动力学测量间接评估大脑功能.
- 需要直接检查神经动力学和大脑血液动力学,以了解RT对大脑功能的影响.
研究的目的:
- 开发一个临床相关的动物模型来研究RT诱导的认知功能障碍.
- 调查分离全脑RT对神经和血液动力学活动的急性和慢性影响.
- 为了将大脑功能的变化与RT后的认知缺陷相关联.
主要方法:
- 在小鼠中开发了一种分成的全脑RT协议 (10天每天3Gy).
- 应用纵向广场光学成像 (WFOI) 来测量在RT后1,2,3个月的神经和血液动力活动.
- 在传感运动和认知领域进行了反复的行为测试.
主要成果:
- 皮质神经和血液动力学活动的障碍在RT后1至3个月恶化.
- RT影响了与默认模式网络和关联区域重叠的大脑区域,类似于人类研究.
- 在新的对象调查和恐惧调节任务中观察到显著的认知缺陷.
结论:
- 建立了一个临床模拟模型来研究RT对大脑功能和认知缺陷的影响.
- 证明RT诱导的神经和血液动力学信号的破坏随着时间的推移而恶化.
- 这些发现为研究针对RT诱导的神经炎症和认知障碍的治疗干预提供了基础.
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