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相关概念视频

Long-term Depression01:05

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over time, all...

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相关实验视频

Updated: Jul 1, 2026

In vivo Imaging of Optic Nerve Fiber Integrity by Contrast-Enhanced MRI in Mice
11:38

In vivo Imaging of Optic Nerve Fiber Integrity by Contrast-Enhanced MRI in Mice

Published on: July 22, 2014

在视觉皮层发育期间,NMDA受体反应的活动依赖性下降.

G Carmignoto1, S Vicini

  • 1FIDIA Georgetown Institute for the Neurosciences, Georgetown University School of Medicine, Washington, DC 20007.

Science (New York, N.Y.)
|November 6, 1992
PubMed
概括
此摘要是机器生成的。

发育中的视觉皮层在年轻的老鼠中显示出较长的NMDA受体活性,这对突触可塑性至关重要. 这个持续时间随着年龄的增长而缩短,这个过程受到环境因素和神经活动的影响.

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Desensitization and Recovery of Crayfish Photoreceptors Upon Delivery of a Light Stimulus
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Desensitization and Recovery of Crayfish Photoreceptors Upon Delivery of a Light Stimulus

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Examination of Anatomical Features of Retinal Ganglion Cells Under N-methyl-D-aspartic Acid (NMDA)-induced Excitotoxicity
07:11

Examination of Anatomical Features of Retinal Ganglion Cells Under N-methyl-D-aspartic Acid (NMDA)-induced Excitotoxicity

Published on: September 19, 2025

相关实验视频

Last Updated: Jul 1, 2026

In vivo Imaging of Optic Nerve Fiber Integrity by Contrast-Enhanced MRI in Mice
11:38

In vivo Imaging of Optic Nerve Fiber Integrity by Contrast-Enhanced MRI in Mice

Published on: July 22, 2014

Desensitization and Recovery of Crayfish Photoreceptors Upon Delivery of a Light Stimulus
06:43

Desensitization and Recovery of Crayfish Photoreceptors Upon Delivery of a Light Stimulus

Published on: November 9, 2019

Examination of Anatomical Features of Retinal Ganglion Cells Under N-methyl-D-aspartic Acid (NMDA)-induced Excitotoxicity
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Examination of Anatomical Features of Retinal Ganglion Cells Under N-methyl-D-aspartic Acid (NMDA)-induced Excitotoxicity

Published on: September 19, 2025

科学领域:

  • 神经科学是一个神经科学.
  • 发育生物学 发展生物学
  • 突触性可塑性 突触性可塑性

背景情况:

  • 发展中的视觉系统是研究环境对神经元连接的影响的关键模型.
  • 在视觉皮层中,N-甲基-D-酸盐 (NMDA) 受体对于体验依赖的突触修饰至关重要.

研究的目的:

  • 研究NMDA受体功能的年龄相关变化及其与视觉皮质可塑性的关系.
  • 探索环境因素和神经活动在调节这些变化的作用.

主要方法:

  • 在年轻和成年大鼠的视觉皮层IV层神经元中,对NMDA介导的刺激后突触电流 (EPSCs) 的电生理学记录.
  • 使用外外补丁对NMDA受体通道封闭性质的分析.
  • 实验性操纵,包括黑暗的养殖和四极毒素治疗.

主要成果:

  • 与成年老鼠相比,NMDA介导的EPSC在年轻老鼠中显著长,与更高的突触可塑性相关.
  • 黑暗的养延长了EPSC持续时间并保持了可塑性,而四毒素抑制了这种减少.
  • 年轻的老鼠神经元在L-谷氨酸应用后显示长时间的NMDA通道开放,与成年神经元不同.

结论:

  • 随着年龄的变化,NMDA受体关门特性有助于视觉皮层可塑性下降.
  • 环境输入和神经活动在调节突触可塑性成熟方面发挥着关键作用.