非离子信号快速重塑后突触DLG,以诱导逆行恒温可塑性
Chengjie Qiu1,2, Sarah Perry1, Christine Chen1
1University of Southern California, Department of Neurobiology, Los Angeles, CA 90089.
概括
在酸盐受体阻塞后,预突触的恒常性强化 (PHP) 迅速加强突触. 这一过程涉及后突触结构重塑,不需要减少离子流,识别大盘 (DLG) 作为一个关键蛋白质.
科学领域:
- 神经科学是一个神经科学.
- 突触性可塑性 突触性可塑性
- 分子生物学分子生物学
背景情况:
- 突触需要对各种挑战有弹性.
- 预突触的恒温增强 (PHP) 是一个在 *Drosophila* 神经肌肉结节 (NMJ) 保存的适应性可塑性机制.
- 通过增强突触前神经递质释放,PHP可以应对诸如谷氨酸受体阻塞等挑战.
研究的目的:
- 为了阐明急性逆行前突触同源性强化 (PHP) 诱导的机制.
- 为了识别PHP信号传输中涉及的后突触组件.
- 调查突触活动在维持恒常性重塑中的作用.
主要方法:
- 在 *Drosophila* NMJ.中对 postsynaptic 谷氨酸受体 (GluRs) 的药理学阻塞.
- 基于CRISPR的基因查以确定关键蛋白质.
- 对 postsynaptic 结构变化和 presynaptic 主动区域强度的分析.
- 在没有活动的情况下评估突触重塑.
主要成果:
- 急性PHP诱导不依赖于通过GluRs减少的离子流.
- 药理阻塞诱导纳米级GluR组织变化,导致后突触重塑.
- 在PHP中, postsynaptic结构变化对于presynaptic重塑至关重要.
- 大盘 (DLG),PSD-95同类,被确定为急性PHP信号的关键.
- 无论是前和后突触区的恒常性重塑,无论突触活动如何,都会持续存在.
结论:
- 急性PHP是由谷氨酸受体扰乱所启动的活动独立的构造信号触发的.
- 涉及DLG的后突触结构改造对于传输诱导PHP的逆行信号至关重要.
- 这些发现揭示了快速突触适应和弹性的一种新机制.
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