- Title
- Heteromeric α/β glycine receptors regulate excitability in parvalbumin-expressing dorsal horn neurons through phasic and tonic glycinergic inhibition
- Creator
- Gradwell, M. A.; Boyle, K. A.; Callister, R. J.; Hughes, D. I.; Graham, B. A.
- Relation
- Funding BodyNHMRCGrant Number631000 http://purl.org/au-research/grants/nhmrc/631000
- Relation
- Journal of Physiology Vol. 595, Issue 23, p. 7185-7202
- Publisher Link
- http://dx.doi.org/10.1113/JP274926
- Publisher
- Wiley-Blackwell
- Resource Type
- journal article
- Date
- 2017
- Description
- Abstract: The dorsal horn (DH) of the spinal cord is an important site for modality-specific processing of sensory information and is essential for contextually relevant sensory experience. Parvalbumin-expressing inhibitory interneurons (PV+ INs) have functional properties and connectivity that enables them to segregate tactile and nociceptive information. Here we examine inhibitory drive to PV+ INs using targeted patch-clamp recording in spinal cord slices from adult transgenic mice that express enhanced green fluorescent protein in PV+ INs. Analysis of inhibitory synaptic currents showed glycinergic transmission is the dominant form of phasic inhibition to PV+ INs. In addition, PV+ INs expressed robust glycine-mediated tonic currents; however, we found no evidence for tonic GABAergic currents. Manipulation of extracellular glycine by blocking either, or both, the glial and neuronal glycine transporters markedly decreased PV+ IN excitability, as assessed by action potential discharge. This decreased excitability was replicated when tonic glycinergic currents were increased by electrically activating glycinergic synapses. Finally, we show that both phasic and tonic forms of glycinergic inhibition are mediated by heteromeric α/β glycine receptors. This differs from GABA A receptors in the dorsal horn, where different receptor stoichiometries underlie phasic and tonic inhibition. Together these data suggest both phasic and tonic glycinergic inhibition regulate the output of PV+ INs and contribute to the processing and segregation of tactile and nociceptive information. The shared stoichiometry for phasic and tonic glycine receptors suggests pharmacology is unlikely to be able to selectively target each form of inhibition in PV+ INs.
- Subject
- glycinergic inhibitions; parvalbumin neurons; dorsal horn; spinal sensory processing
- Identifier
- http://hdl.handle.net/1959.13/1396054
- Identifier
- uon:33984
- Identifier
- ISSN:0022-3751
- Rights
- 2017 The Authors. The Journal of Physiology published by John Wiley & Sons Ltd on behalf of The Physiological Society DOI: 10.1113/JP274926. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
- Language
- eng
- Full Text
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