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第I组甲基胺基基因组受体触发的临时模式的动作潜力依赖的自发突触传递在小鼠MNTB神经元中
Huimei Wang1, Kang Peng1, Rebecca J Curry2
1Hearing Research Group, Department of Anatomy and Neurobiology, College of Medicine, Northeast Ohio Medical University, Rootstown, OH, 44272, USA.
Hearing research
|June 7, 2023
概括
大脑干听神经元中的metabotropic谷氨酸受体 (mGluRs) 意外诱导了节奏突触活动. 这一发现揭示了声音局部化电路中神经活动模式的新机制.
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
- 突触性可塑性 突触性可塑性
背景情况:
- 节拍神经元产生节律动作潜力 (AP),影响目标神经元.
- 听觉处理依赖于与声音刺激同步的时间模式的神经活动.
- 自发的神经活动通常是随机的,使得精确的时间无法预测.
研究的目的:
- 调查甲基酸盐受体 (mGluRs) 在产生模式神经活动中的作用.
- 探索形体 (MNTB) 中介核中节律性突触反应的机制.
- 确定mGluR5在这种现象中的参与.
主要方法:
- 在急性小鼠大脑切片中的全细胞电压录音.
- 使用3,5-DHPG激活I组mGluRs.
- 自动相关性分析以检测节律发生.
- 细胞附着记录和免疫细胞化学.
主要成果:
- I组mGluR激活在MNTB神经元中引起了暂时模式的AP依赖的甘氨基抑制后突触电流 (sIPSCs) 和谷氨基刺激后突触电流 (sEPSCs).
- 自动相关性揭示了这些突触反应中的节律发生.
- mGluR5淘汰赛显著降低了3,5-DHPG诱导的影响.
- 在预突触VNTB细胞中观察到有模式的尖峰,而非体输入与有模式的SEPSC有关.
结论:
- I组mGluR激活,特别是通过mGluR5,可以诱导MNTB中的节律性突触活动.
- 这表明在脑干声音定位电路中产生模式自发活动的新型中央机制.
- 这些发现突显了mGluRs在神经节律发生过程中之前未被认可的作用.
相关概念视频
01:35Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
01:14Action Potential
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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Membrane potential in neurons
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01:25Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
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