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相关概念视频

The Synapse02:47

The Synapse

133.7K
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.
133.7K
Synaptic Signaling01:12

Synaptic Signaling

79.8K
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.
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Electrical Synapses01:28

Electrical Synapses

10.9K
Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
10.9K
Chemical Synapses01:26

Chemical Synapses

11.8K
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...
11.8K
Chemical Synapses01:26

Chemical Synapses

4.6K
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...
4.6K
Overview of Synapses01:25

Overview of Synapses

5.5K
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...
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Updated: Feb 10, 2026

Optogenetic Phase Transition of TDP-43 in Spinal Motor Neurons of Zebrafish Larvae
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Optogenetic Phase Transition of TDP-43 in Spinal Motor Neurons of Zebrafish Larvae

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病态的TDP-43丝在突触处积聚,导致突触功能障碍.

Renren Chen, Imogen Stockwell, Jessica C Pierce

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    |February 9, 2026
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    概括
    此摘要是机器生成的。

    在FTD等神经退行性疾病的早期,TDP-43蛋白聚合物在突触中积聚,导致突触功能障碍和神经元过激动. 这项研究将TDP-43光纤积累与疾病进展和神经元损失联系起来.

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    Optogenetic Phase Transition of TDP-43 in Spinal Motor Neurons of Zebrafish Larvae
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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
    • 病理学 病理学 病理学

    背景情况:

    • TDP-43聚合成粉样纤维是神经退行性疾病的关键特征,如运动神经元疾病 (MND) 和前性痴呆症 (FTD).
    • 突触功能障碍和神经元过激动性是这些TDP-43蛋白质病变的早期病理事件.
    • 虽然TARDBP基因的突变证实了TDP-43的作用,但丝积累的机制及其对神经退行的贡献仍然不清楚.

    研究的目的:

    • 为了研究神经元中TDP-43丝积累的早期阶段.
    • 为了确定TDP-43纤维的分子相互作用和细胞位置.
    • 了解TDP-43光纤积累如何影响突触功能和神经元刺激性.

    主要方法:

    • 通过小鼠和人类皮质神经元将患者衍生的TDP-43纤维内部化.
    • 接近性标签,以识别TDP-43灯丝相互作用.
    • 电子冷断层扫描 (cryo-ET) 用于在现场高分辨率成像TDP-43细丝.
    • 突触活动和神经元刺激性的功能测量.

    主要成果:

    • 发现TDP-43丝在突触中积聚,特别是在前突触活性区附近,这一发现在FTD患者的大脑中得到了验证.
    • 通过冷ET的直接可视化揭示了在前突触细胞质内存在的TDP-43丝,与突触囊泡和血膜相互作用.
    • 积累的TDP-43细丝导致了前突触功能障碍和随后的神经元过激动.

    结论:

    • 突触是TDP-43光纤积累和传播的主要早期地点.
    • 这项研究确立了TDP-43光纤功能增强和突触功能障碍之间的直接联系.
    • 这些发现强调了突触病理在TDP-43蛋白病变中的关键作用.