慢性阶段的进展降低了识别记忆,并增加了老年小鼠的血管认知痴呆类损伤
Jennifer A Liu1, Jacob R Bumgarner2, William H Walker2,3
1Department of Neuroscience, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, USA. jliu324@jhu.edu.
Scientific reports
|April 2, 2024
概括
慢性时差 (CJL) 扰乱昼夜节律,导致老年小鼠的性别特异性认知障碍和脑血管变化. 这种干扰可能会加速与年龄相关的认知衰退和血管认知障碍和痴呆症.
科学领域:
- 神经科学是一个神经科学.
- 时间生物学 时间生物学
- 血管生物学 血管生物学
背景情况:
- 被扰乱的昼夜节律会使内部时钟失调,影响健康.
- 衰老是中风和血管认知障碍和痴呆症 (VCID) 的关键风险因素.
- 以前的研究将昼夜干扰与年轻小鼠的神经炎症和缺血后损伤联系起来.
研究的目的:
- 为了调查慢性时差 (CJL) 是否会加剧认知衰退,并改变老年小鼠的大脑血管结构.
- 为了确定CJL是否会增加老年人群血管认知障碍和痴呆症 (VCID) 的风险.
- 测试CJL改变脑血管结构,导致老年小鼠的认知障碍的假设.
主要方法:
- 在8周内,老年雌雄小鼠通过重复的6小时阶段进步经历了慢性时差 (CJL).
- 用空间处理和听觉驱动的关联学习任务来评估认知功能.
- 分析了脑血管架构,特别是异皮质中的血管曲性.
主要成果:
- 暴露于CJL的雌性小鼠显示空间处理受损,学习能力下降.
- 暴露于CJL的雄性小鼠表现出学习信息的记忆能力受损.
- CJL诱导了异皮质中的血管扭曲性增加,这是与血管疾病风险相关的标志物.
结论:
- 慢性时差在老年小鼠中诱导性别特定的认知缺陷.
- CJL改变了大脑血管结构,增加了对血管相关认知衰退的易感性.
- 循环节律障碍加速与年龄相关的认知衰退,可能是VCID的治疗目标.
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