在多种类型的牙状内部神经元中介于 GABAB-受体的后突触电流
Claudius E Degro1, Imre Vida1, Sam A Booker1,2,3
1Institute for Integrative Neuroanatomy, Charité-Universitätmedizin Berlin, Berlin, Germany.
Hippocampus
|August 14, 2024
概括
代代基GABAB-受体 (GABABRs) 在不同类型的牙状内部神经元中表现出不同的信号强度. 这种异质性会影响海马网络内的抑制控制和信号处理.
科学领域:
- 神经科学是一个神经科学.
- 细胞神经科学 细胞神经科学
- 系统神经科学 系统神经科学
背景情况:
- 牙状回形 (DG) 使用多种GABAergic内部神经元来精确调节电路活动.
- 代代基GABAB-受体 (GABABRs) 对于DG中的抑制至关重要,影响与学习和行为相关的时间表.
- GABABRs在调节DG内部不同类型的内部神经元中的特定作用仍然基本上没有特征.
研究的目的:
- 为了研究GABABR信号强度在老鼠牙状环中的细胞类型特定异质性.
- 了解GABABR信号的变化如何影响已识别的DG内部神经元的兴奋性和功能.
- 阐明GABABR激活对DG电路动力学和信号处理的下游影响.
主要方法:
- 在实验室中,对已识别的DG主要细胞和内部神经元进行了全细胞补丁记录.
- 使用了GABABRs的药理学操纵,封闭GABA的光解以及内源GABA释放的细胞外刺激.
- 测量了 postsynaptic 电流和神经元刺激性的变化,以评估细胞类型特定的抑制潜力.
主要成果:
- 在所有内部神经元类型中检测到后突触GABABR介导的电流,其幅度因 soma位置和突触点而异.
- 大量的GABABR介导电流与内部神经元刺激性降低之间观察到强烈的相关性,通过向内纠正的K+通道进行介导.
- 这项研究系统地描述了GABABR在不同DG内部神经元群体中的信号传递.
结论:
- 在牙状环内,GABABR信号表现出显著的细胞类型特异性.
- 在GABABR功能中这种异质性直接影响内部神经元对DG网络活动施加的抑制控制.
- 这些发现提供了对海马体信号处理和网络动态背后的机制的关键见解.
相关概念视频
Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.2K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.2K
Excitatory and Inhibitory Effects of Neurotransmitters
9.9K
When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
9.9K
G-Protein Gated Ion Channels
4.6K
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
Sensory...
4.6K
The Role of Ion Channels in Neuronal Computation
3.2K
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
3.2K
Integration of Synaptic Events
1.5K
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...
1.5K
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...
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...
8.8K


