确定了新皮层中缓慢抑制的来源和目标
Gábor Tamás1, Andrea Lorincz, Andrea Simon
1Department of Comparative Physiology, University of Szeged, Közép fasor 52, Szeged H-6726, Hungary. gtamas@bio.u-szeged.hu
Science (New York, N.Y.)
|March 22, 2003
概括
神经状细胞独特地通过GABA (B) 受体提供缓慢的皮质抑制,准金字塔神经元树突. 这种独特的机制允许局部调节大脑活动.
科学领域:
- 神经科学是一个神经科学.
- 细胞神经科学 细胞神经科学
- 突触性可塑性 突触性可塑性
背景情况:
- 大脑皮层中的抑制后突触潜能 (IPSPs) 对于调节神经元活动至关重要.
- 快速抑制是由胺黄油酸A型 (GABA(A)) 受体介导的,而缓慢抑制涉及GABA(B) 受体.
- 负责缓慢抑制的特定内部神经元群体在很大程度上仍未确定.
研究的目的:
- 确定脑皮层中缓慢,代谢性氨酸乙型 (GABA(B)) 受体介导的抑制的独特来源.
- 描述这些已识别的抑制性内部神经元的突触性质和突触后点.
主要方法:
- 在皮层切片中的电生理学记录.
- 单细胞标记和形态分析.
- 对GABA (A) 和GABA (B) 受体的药理学操纵.
主要成果:
- 一个特定的GABAergic内部神经元类,称为神经状 (NG) 细胞,被确定为缓慢抑制的主要来源.
- 在单个动作潜能发射时,NG细胞引发了由电离子型GABA (A) 和元型GABA (B) 受体介导的后突触反应.
- 与其他GABAergic内部神经元相比,NG细胞主要化了金字塔神经元的树突,这是一个独特的后突触点.
结论:
- 神经状细胞代表了一个独特的内部神经元类,在大脑皮层中介于缓慢的抑制.
- NG细胞对树突的有针对性的内化表明它在选择性调节突触整合和可塑性方面发挥了作用.
- 这种独特的抑制途径提供了一个局部控制皮层刺激能力的机制.
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