Differences in the activation of inhibitory motoneuron receptors in the frog Rana ridibunda by GABA and glycine and their interaction

被引：2

作者：

Kalinina N.I. ^{[1
]}

Kurchavyi G.G. ^{[1
]}

Amakhin D.V. ^{[1
]}

Veselkin N.P. ^{[1
]}

机构：

[1] I. M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg 194223

来源：

Neuroscience and Behavioral Physiology | 2009年 / 39卷 / 8期

基金：

俄罗斯基础研究基金会;

关键词：

GABA; Glycine; Intracellular recording; Motoneuron; Spinal cord;

D O I：

10.1007/s11055-009-9192-9

中图分类号：

学科分类号：

摘要：

Intracellular recording of potentials was used in isolated spinal cord segments from the frog Rana ridibunda to compare the inhibitory effects of GABA and glycine on the motoneuron membrane. At equal concentrations, the response (a change in membrane potential) to application of glycine was 1.5-2 times greater than the response to GABA in terms of amplitude, and EC50 values were 0.75 and 1.57 mM, respectively. The response to simultaneous application of GABA and glycine averaged 79.1 ± 2.4% (n = 19) of the sum of the individual responses and 130.1 ± 1.5% (n = 19) of the glycine response (partial occlusion). Preliminary application of glycine decreased the GABA response by 85.3 ± 0.2% (n = 10), while preapplication of GABA decreased the glycine response by only 52.9 ± 0.3% (n = 11). The glycine and GABA responses were specifically suppressed by strychnine and bicuculline. These results provide evidence that as in mammals, amphibian motoneurons have both glycine (predominantly) and GABAA receptors; they also show that asymmetrical cross inhibition can occur. © 2009 Springer Science+Business Media, Inc.

引用

页码：775 / 783

页数：8

共 41 条

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