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相关概念视频

The Synapse02:47

The Synapse

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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Overview of Synapses01:25

Overview of Synapses

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A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
2.3K
Synaptic Signaling01:09

Synaptic Signaling

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
5.6K
Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

11.1K
Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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Chemical Synapses01:26

Chemical Synapses

8.8K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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Integration of Synaptic Events01:28

Integration of Synaptic Events

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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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相关实验视频

Updated: Jul 9, 2025

Presynapse Formation Assay Using Presynapse Organizer Beads and “Neuron Ball” Culture
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Presynapse Formation Assay Using Presynapse Organizer Beads and “Neuron Ball” Culture

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S-SCAM对于突触形成至关重要.

Nina Wittenmayer1,2, Andonia Petkova-Tuffy1, Maximilian Borgmeyer2

  • 1Institute of Anatomy and Embryology, University Medical Center Göttingen, Göttingen, Germany.

Frontiers in cellular neuroscience
|December 4, 2023
PubMed
概括

突触形成对于神经回路至关重要. 击败S-SCAM蛋白质会破坏突触组合,损害神经发育和功能.

关键词:
神经元形态学 神经元形态学脚手架中的蛋白质.脊柱 脊柱 脊柱 脊柱 脊柱突触形成的突触形成突触传输是突触传输的过程.

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Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
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Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient
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Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient

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Last Updated: Jul 9, 2025

Presynapse Formation Assay Using Presynapse Organizer Beads and “Neuron Ball” Culture
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Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
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Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient

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Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient
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科学领域:

  • 神经科学是一个神经科学.
  • 分子生物学分子生物学
  • 发展生物学 发展生物学

背景情况:

  • 突触形成对于神经电路的发展至关重要.
  • 突触支架蛋白S-SCAM/MAGI-2参与突触后信号复合体组合.
  • 在整体突触建立中S-SCAM的全面作用仍然不清楚.

研究的目的:

  • 研究S-SCAM在突触形成和神经电路发展中的作用.
  • 为了确定S-SCAM敲击对突触结构和功能的影响.
  • 为了阐明S-SCAM参与突触组件的招募.

主要方法:

  • 由RNA干扰 (RNAi) 诱导的S-SCAM倒置在体外和体内.
  • 对突触数量,树突脊柱密度和树突树木化的分析.
  • 评估使用免疫光检测的前和后突触组件聚类.
  • 电生理学记录以评估突触传输.
  • 下一代测序用于分析基因表达特征.

主要成果:

  • 在早期网络发展过程中,S-SCAM knockdown显著减少了突触数量.
  • 在体内, Knockdown 导致大鼠新皮质中的树突脊柱密度下降.
  • 降低的S-SCAM水平损害了前和后突触蛋白和细胞粘附分子的聚类,表明突触形成失败.
  • 神经元显示突触传输受损,树突树木化减少.
  • 下一代测序揭示了39个突触信号分子的改变表达.

结论:

  • S-SCAM对于各种突触组件的组装至关重要,包括脚手架蛋白,囊泡蛋白和细胞粘附分子.
  • 在突触形成过程中,S-SCAM在调解所有关键分子类的招募中发挥着至关重要的作用.
  • 这种蛋白质对于发育中的大脑中神经回路的正常发育和功能至关重要.