Perisomatic glutamatergic axon terminals: A novel feature of cortical synaptology revealed by vesicular glutamate transporter 1 immunostaining

被引：34

作者：

Alonso-Nanclares, L

Minelli, A

Melone, M

Edwards, RH

Defelipe, J

Conti, F

机构：

[1] Univ Politecn Marche, Sect Human Physiol, Dept Neurosci, I-60020 Ancona, Italy

[2] CSIC, Inst Cajal, Madrid 28002, Spain

[3] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA

来源：

NEUROSCIENCE | 2004年 / 123卷 / 02期

基金：

美国国家卫生研究院;

关键词：

glutamate; spillout; synapses; neocortex;

D O I：

10.1016/j.neuroscience.2003.09.033

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

The cellular localization of the vesicular glutamate transporter 1, VGLUT1, was studied in the rat cerebral cortex with immunocytochemical techniques. VGLUT1 immunoreactivity (ir) was localized to punctate structures dispersed in the neuropil of all cortical layers as well as around the profile of somata and proximal dendritic segments of virtually all pyramidal neurons. Using a correlative light and electron microscopic method, we found that VGLUT1 ir is expressed in axon terminals forming synapses exclusively with dendritic shafts and spines. Perisomatic VGLUT1-positive terminals never formed synapses with the pyramidal cell bodies to which they were in apposition, but formed asymmetric synapses with adjacent neuropilar dendritic elements. The high probability of a close spatial relationship between glutamatergic and GABAergic terminals in perisomatic regions suggests that spilled-out glutamate may act on inhibitory axon terminals innervating the soma of cortical pyramidal neurons. (C) 2003 IBRO. Published by Elsevier Ltd. All rights reserved.

引用

页码：547 / 556

页数：10

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[51] EXPERIMENTAL ELECTRON-MICROSCOPIC STUDY OF AFFERENT CONNECTIONS TO THE PRIMATE MOTOR AND SOMATIC SENSORY CORTICES [J].