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谷氨酸诱导功能在发育皮层中的新生长
Hyung-Bae Kwon1, Bernardo L Sabatini
1Howard Hughes Medical Institute, Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|May 10, 2011
概括
谷氨酸会在正在发育的小鼠神经元中触发新的脊柱生长. 这些新形成的脊柱很快就变得具有功能,整合到神经回路中,塑造大脑的连接.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 发育生物学 发展生物学
背景情况:
- 成熟的神经元通过树突脊柱接收激发性输入.
- 脊柱重塑对于发育,学习和感官体验至关重要.
- 新脊柱形成的机制及其功能作用仍然不清楚.
研究的目的:
- 研究新的脊柱形成的生化触发因素和机制.
- 确定神经元连接中新形成的脊柱的功能意义.
- 开发实时方法来诱导和监测脊柱形成.
主要方法:
- 组合的两光子激光扫描显微镜和两光子激光解锁谷氨酸.
- 在小鼠皮层神经元中诱导和实时监测de novo脊柱形成.
- 生物化学途径分析 (NMDARs,PKA,CaMKII,TrkB). 这是一个非常重要的过程.
主要成果:
- 谷氨酸足以以特定位置的方式触发新的脊柱生长.
- 谷氨酸诱导的旋转发生需要NMDAR和PKA的激活.
- 新形成的脊柱是快速的功能,表达谷氨酸受体和转换信号.
结论:
- 早期的神经连接是由空间精确的活动塑造的.
- 新生的树棘很快被纳入功能性皮质电路.
- 谷氨酸信号传递在活动依赖的脊柱形成和电路发育中起着关键作用.
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