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首页> 外文期刊>Neuron >Peri-Synaptic Glia Recycles Brain-Derived Neurotrophic Factor for LTP Stabilization and Memory Retention
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Peri-Synaptic Glia Recycles Brain-Derived Neurotrophic Factor for LTP Stabilization and Memory Retention

机译:突触周围胶质细胞回收脑源性神经营养因子,以稳定LTP和记忆。

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摘要

Glial cells respond to neuronal activation and release neuroactive molecules (termed "gliotransmitters") that can affect synaptic activity and modulate plasticity. In this study, we used molecular genetic tools, ultra-structural microscopy, and electrophysiology to assess the role of brain-derived neurotrophic factor (BDNF) on cortical gliotransmission in vivo. We find that glial cells recycle BDNF that was previously secreted by neurons as pro-neurotrophin following long-term potentiation (LTP)-inducing electrical stimulation. Upon BDNF glial recycling, we observed tight, temporal, highly localized TrkB phosphorylation on adjacent neurons, a process required to sustain LTP. Engagement of BDNF recycling by astrocytes represents a novel mechanism by which cortical synapses can expand BDNF action and provide synaptic changes that are relevant for the acquisition of new memories. Accordingly, mice deficient in BDNF glial recycling fail to recognize familiar from novel objects, indicating a physiological requirement for this process in memory consolidation.
机译:胶质细胞对神经元的激活作出反应并释放神经活性分子(称为“神经胶质递质”),这些分子可影响突触活性并调节可塑性。在这项研究中,我们使用了分子遗传学工具,超微结构显微镜和电生理学来评估脑源性神经营养因子(BDNF)在体内皮层神经胶质传输中的作用。我们发现神经胶质细胞回收BDNF,它是在长期增强(LTP)诱导电刺激后由神经元分泌的促神经营养素。 BDNF神经胶质回收后,我们观察到相邻神经元发生紧密,暂时,高度局部化的TrkB磷酸化,这是维持LTP的过程。星形胶质细胞与BDNF循环的结合代表了一种新的机制,通过该机制,皮层突触可以扩展BDNF的作用并提供与获取新记忆有关的突触变化。因此,缺乏BDNF神经胶质循环的小鼠无法从新物体中识别出熟悉的物体,这表明该过程在记忆巩固中具有生理学要求。

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