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在噪音创伤后,深层皮质神经元的突触性,内在性和声响特性中的细胞类型特定可塑性

Yanjun Zhao^1,2, Stylianos Kouvaros^1,2,3, Nathan A Schneider^1,2,4,5

¹Department of Otolaryngology, University of Pittsburgh, Pittsburgh, PA, USA.

Science advances

|September 19, 2025

概括

外周损伤导致听觉皮层的变化. 在噪音引起的听力损失后,第5层外脑 (ET) 和第6层皮质体 (CT) 神经元表现出明显的可塑性,影响声音处理.

科学领域:

神经科学是一个神经科学.
听觉神经科学听觉神经科学
细胞神经科学细胞神经科学

背景情况:

外周损伤,如噪音引起的听力损失 (NIHL),诱导听力皮层 (ACtx) 的可塑性.
在听力损失后驱动ACtx可塑性的特定突触和细胞机制尚未完全理解.
深层神经元,包括第5层外脑 (ET) 和第6层皮质体 (CT) 神经元,在听觉处理中起着至关重要的作用.

研究的目的:

为了研究NIHL之后听觉皮层的5层ET和6层CT神经元的独特可塑性机制.
阐明突触和细胞变化是听觉皮层适应外围损伤的基础.

主要方法:

在体外切片电生理学.
视觉遗传学视觉遗传学
在体内采用两光子成像技术.
在小鼠中的噪音引起的听力损失 (NIHL) 模型.

主要成果:

在NIHL后1天,thalamocortical输入从平衡转变为CT主导,在第7天正常化.
CT神经元显示量体大小和刺激性增加,而ET神经元的变化最小.
在体内,CT神经元显示声音强度值持续升高;ET神经元显示频率调和高频响应的短暂变化.

结论:

外围损伤在深层ACtx神经元 (ET与CT) 中触发了独特的,细胞类型特定的可塑性.
这些发现揭示了对听力损失的不同神经元反应,CT神经元表现出更持久的变化.
了解这些机制可能为治疗与听力损失相关的疾病 (如耳和超声障) 提供目标.

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