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Molecular Pain
Published in: Molecular Pain 1/2014

Open Access 01-12-2014 | Research

Expression of gastrin-releasing peptide by excitatory interneurons in the mouse superficial dorsal horn

Authors: Maria Gutierrez-Mecinas, Masahiko Watanabe, Andrew J Todd

Published in: Molecular Pain | Issue 1/2014

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Abstract

Background

Gastrin-releasing peptide (GRP) and its receptor have been shown to play an important role in the sensation of itch. However, although GRP immunoreactivity has been detected in the spinal dorsal horn, there is debate about whether this originates from primary afferents or local excitatory interneurons. We therefore examined the relation of GRP immunoreactivity to that seen with antibodies that label primary afferent or excitatory interneuron terminals. We tested the specificity of the GRP antibody by preincubating with peptides with which it could potentially cross-react. We also examined tissue from a mouse line in which enhanced green fluorescent protein (EGFP) is expressed under control of the GRP promoter.

Results

GRP immunoreactivity was seen in both primary afferent and non-primary glutamatergic axon terminals in the superficial dorsal horn. However, immunostaining was blocked by pre-incubation of the antibody with substance P, which is present at high levels in many nociceptive primary afferents. EGFP+ cells in the GRP-EGFP mouse did not express Pax2, and their axons contained the vesicular glutamate transporter 2 (VGLUT2), indicating that they are excitatory interneurons. In most cases, their axons were also GRP-immunoreactive. Multiple-labelling immunocytochemical studies indicated that these cells did not express either of the preprotachykinin peptides, and that they generally lacked protein kinase Cγ, which is expressed by a subset of the excitatory interneurons in this region.

Conclusions

These results show that GRP is expressed by a distinct population of excitatory interneurons in laminae I-II that are likely to be involved in the itch pathway. They also suggest that the GRP immunoreactivity seen in primary afferents in previous studies may have resulted from cross-reaction of the GRP antibody with substance P or the closely related peptide neurokinin A.
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Metadata
Title
Expression of gastrin-releasing peptide by excitatory interneurons in the mouse superficial dorsal horn
Authors
Maria Gutierrez-Mecinas
Masahiko Watanabe
Andrew J Todd
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Molecular Pain / Issue 1/2014
Electronic ISSN: 1744-8069
DOI
https://doi.org/10.1186/1744-8069-10-79

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