在突触NMDA受体激活后,AMPA受体的快速脊柱传递和再分配
S H Shi1, Y Hayashi, R S Petralia
1Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
概括
研究人员使用绿色光蛋白 (GFP) 标记追踪神经元中的α-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) 受体变化. 性刺激迅速将这些标记受体传递到树突中,需要N-甲基-D-酸盐 (NMDA) 受体激活.
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
- 细胞生物学 细胞生物学
背景情况:
- 了解α-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) 受体的动态分布对于阐明突触可塑性至关重要.
- AMPA受体的GluR1亚单元在突触功能和可塑性中起着关键作用.
研究的目的:
- 为了可视化和监控活神经元中AMPA受体子单元的实时贩运.
- 调查N-甲基-D-酸盐 (NMDA) 受体激活在突触刺激期间AMPA受体贩运中的作用.
主要方法:
- 绿色光蛋白 (GFP) 用于标记AMPA受体的GluR1亚单元,创建一个功能性的GluR1-GFP融合蛋白.
- 在海马的CA1神经元中,GluR1-GFP的短暂表达.
- 使用高分辨率成像技术,包括双光子激光扫描显微镜和电子显微镜,可视化受体分布.
- 性突触刺激被应用来诱导可塑性.
主要成果:
- 大多数表达的GluR1-GFP在树突区内细胞内被发现,反映了内源GluR1.1的分布.
- 紧张性突触刺激导致GluR1-GFP迅速转移到树突状脊柱中,并沿树突形成受体集群.
- 这些贩运事件取决于 postsynaptic N-methyl-D-aspartate (NMDA) 受体的激活.
结论:
- 含有GluR1的AMPA受体在树突状棘中的活动依赖性贩运是一个快速的过程.
- 在塑性过程中,NMDA受体的激活对于调解AMPA受体的突触后传递至关重要.
- 这些发现提供了对长期强化和突触成熟期间增强AMPA受体介导传播的分子机制的洞察.
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