在哺乳动物脊髓中静音的谷氨酸突触和感觉
Nature
|June 26, 1998
概括
血清素 (5-基三胺,5-HT) 激活了脊髓背部角的沉默的谷氨酸突触. 这种静音突触转化为功能突触的转化可能是中枢神经系统可塑性的关键机制.
科学领域:
- 神经科学是一个神经科学.
- 脊髓生理学 脊髓生理学
- 突触性可塑性 突触性可塑性
背景情况:
- 脊髓表面背部角中的神经元传输外周感官信息.
- 背部角中的某些感觉突触是低效的或沉默的,阻碍有效的信号传输.
- 由于小的突触后电流或升高的作用电位值,可能会发生无效的传输.
研究的目的:
- 为了研究表面背角中静音突触的存在和特征.
- 确定血清素 (5-基三胺,5-HT) 在调节这些无声突触中的作用.
- 探索脊髓中中央可塑性的潜在细胞机制.
主要方法:
- 来自腰部脊髓表面背部角的神经元的电生理记录.
- 操纵持膜潜能以评估突触反应.
- 应用血清素 (5-HT) 来观察其对突触传播的影响.
主要成果:
- 在表面的背角神经元中确定了静音的谷氨酸突触,需要去极化持有电位 (+40mV) 来引起反应.
- 证明了血清素 (5-HT) 将这些无声的谷氨酸突触转化为功能性的突触.
- 观察到,来自拉菲脊柱通路的5-HT神经递质激活了以前没有反应的突触.
结论:
- 沉默的谷氨酸突触存在于脊髓的表面背部角.
- 血清素 (5-HT) 在将沉默的突触转化为活跃的,功能性的突触方面发挥着至关重要的作用.
- 沉默突触由5-HT的转化代表了一个重要的细胞机制,是脊髓中中央可塑性的基础.
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