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天体细胞的自发活动是记忆巩固的随机功能信号

Gabriele Losi^1,2, Beatrice Vignoli^1,3,4, Rocco Granata⁵

¹Institute of Neuroscience, National Research Council, Padova section, Padova 35131, Italy.

Proceedings of the National Academy of Sciences of the United States of America

|October 14, 2025

概括

天体细胞中自发的微域 (MDs) 通过促进质传递和持续的脑衍生神经营养因子 (BDNF) 释放来调节记忆巩固. 这种随机天体细胞活动稳定了记忆电路.

科学领域:

神经科学是一个神经科学.
质生物学质生物学
记忆研究记忆研究

背景情况:

星体细胞,质细胞,在细微的过程中表现出自发的细胞内 (Ca2+) 波动,称为微域 (MDs).
这些自发的Ca2+MDs在大脑功能中的功能作用在很大程度上是未知的.

研究的目的:

调查自发Ca2+MDs对缓慢演变的大脑现象,特别是记忆巩固的贡献.
为了确定星体Ca2+MDs是否调节围回性皮质中的突触可塑性和记忆形成.

主要方法:

利用成像技术观察天体细胞中自发的Ca2+MDs.
研究了Ca2+MDs对Ca2+依赖性质传递和突触强化的影响.
评估了来自大脑的神经营养因子 (BDNF) 和热胺受体激酶B (TrkB) 信号在记忆巩固中的作用.

主要成果:

天体细胞中自发的Ca2+MDs促进了Ca2+依赖的质传递,并调节了围膜皮层中的突触强化.
经常出现的Ca2+MD活动维持了脑衍生神经营养因子 (BDNF) 的释放,确保了必要的Tropomyosin受体激酶B (TrkB) 信号传递,以实现长期的强化.
Ca2+ MDs在晶体传递过程中保持随机行为,在记忆保留中引入不可预测性.

结论:

自发的天体细胞Ca2+微域在记忆巩固中起着至关重要的作用.
星细胞的随机活动塑造和稳定记忆电路,突出了认知过程中质信号传递的新功能.

关键词:

在Ca2+微域中.记忆电路的内存电路.这些神经营养素是神经营养素 (neurotrophins).突触性可塑性突触性可塑性

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