保持了突触架构,但在老化前皮层的第5层金字塔神经元中,胺诱导的突触可塑性受损
bioRxiv : the preprint server for biology
|September 15, 2025
概括
健康的衰老通过减少前皮层电路中的活动依赖性突触重塑来损害认知灵活性. 这项研究表明,虽然基线树突性脊柱结构保持不变,但大脑
科学领域:
- 神经科学是一个神经科学.
- 衰老研究研究 衰老研究
- 认知科学 认知科学
背景情况:
- 健康的衰老会导致认知能力下降,特别是像认知灵活性这样的执行功能.
- 额叶皮质回路对于这些功能至关重要,但与年龄相关的突触可塑性变化尚未得到充分理解.
- 状棘是突触可塑性和经验依赖重塑的关键位置.
研究的目的:
- 研究小鼠二级运动皮质 (MO) 的树突脊柱密度,动力学和活动依赖性可塑性的与年龄相关的变化.
- 在老年小鼠中,将这些结构变化与认知灵活性缺陷相关联.
- 探索潜在的治疗点,以恢复衰老中的认知功能.
主要方法:
- 在Thy1-eGFP-M小鼠中的第5层金字塔神经元的纵向in vivo双光子成像.
- 使用四种气味选择歧视和反转任务评估认知灵活性.
- 对树突性脊柱密度,周转,形态学和胺诱导的脊柱生成的分析.
主要成果:
- 与年轻小鼠相比,老年小鼠的认知灵活性明显受损.
- 基线树突性脊柱密度,周转率和形态在老年小鼠中保持不变.
- 与年轻小鼠不同的是,老年小鼠表现出胺诱导的脊髓生成受损,新脊髓的稳定性降低.
结论:
- 健康的衰老选择性地损害了前额皮质回路中的活动依赖的突触重塑,而不是稳定状态的脊柱架构.
- 诱导突触可塑性的缺陷与与年龄相关的认知灵活性障碍有关.
- 针对可塑性机制可能会恢复老化大脑的执行功能和认知适应能力.
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