在突触前活性区中,甲基胺基因组受体的目标细胞特异度
R Shigemoto1, A Kulik, J D Roberts
1Medical Research Council, Anatomical Neuropharmacology Unit, Department of Pharmacology, Oxford University, UK.
Nature
|June 6, 1996
概括
预突触的甲基酸盐受体7 (mGluR7) 水平在老鼠海马中的突触之间有所不同. 这表明神经元可以根据后突触目标微调神经递质释放概率.
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
- 神经药理学神经药理学
背景情况:
- 突触神经递质释放是由突触前受体调节的.
- 主要刺激性神经递质谷氨酸释放被前突触性自身受体抑制.
研究的目的:
- 为了研究大鼠海马体前突触终端的甲基酸盐受体7 (mGluR7) 的局部化和差异表达.
- 为了确定mGluR7水平是否根据后突触神经元点而有所变化.
主要方法:
- 免疫组织化学定位mGluR7在老鼠海马.
- 在不同突触群体中对mGluR7表达的定量分析.
主要成果:
- 甲基增生谷氨酸受体7 (mGluR7) 局限于突触前网格,这是突触囊泡融合的地点.
- 针对mGluR1α表达内部神经元的前突触终端表现出明显更高的mGluR7水平 (超过十倍) 与针对金字塔细胞或其他内部神经元的前突触终端相比.
- 观察到mGluR7的差异表达甚至在由单个轴突突结形成的突触上也存在.
结论:
- mGluR7的独特局部化和可变表达水平表明了突触特异性调节谷氨酸释放的机制.
- 前突触神经元可以根据后突触伴侣的身份动态调整神经递质释放概率.
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