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Published in: Molecular Pain 1/2010

Open Access 01-12-2010 | Research

Facilitation of the inhibitory transmission by gastrin-releasing peptide in the anterior cingulate cortex

Authors: XiaoYan Cao, Valentina Mercaldo, Pingyang Li, Long-Jun Wu, Min Zhuo

Published in: Molecular Pain | Issue 1/2010

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Abstract

Gastrin-releasing peptide (GRP) has been proposed as a peptidergic molecule for behavioral fear and itching. Immunohistochemistry and in situ hybridization studies have shown that GRP and GRP receptor are widely distributed in forebrain areas. Less information is available for the functional action for GRP in the prefrontal cortex including the anterior cingulate cortex (ACC). Here we used whole-cell patch-clamp recording technique to study the modulation of synaptic transmission by GRP in the ACC. We found that GRP increased the frequency of sIPSCs recorded while had no significant effect on sEPSCs in ACC pyramidal neurons. The facilitatory effect of GRP on sIPSCs was blocked by the GRP receptor antagonist, RC3095. In the presence of TTX, however, GRP had no effect on the mIPSCs. Therefore, activation of GRP receptor may facilitate the excitation of the interneurons and enhanced spontaneous GABAergic, but not glutamatergic neurotransmission. Similar results on GRP modulation of GABAergic transmission were observed in the insular cortex and amygdala, suggesting a general possible effect of GRP on cortical inhibitory transmission. Our results suggest that GRP receptor is an important regulator of inhibitory circuits in forebrain areas.
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Metadata
Title
Facilitation of the inhibitory transmission by gastrin-releasing peptide in the anterior cingulate cortex
Authors
XiaoYan Cao
Valentina Mercaldo
Pingyang Li
Long-Jun Wu
Min Zhuo
Publication date
01-12-2010
Publisher
BioMed Central
Published in
Molecular Pain / Issue 1/2010
Electronic ISSN: 1744-8069
DOI
https://doi.org/10.1186/1744-8069-6-52

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