Abstract：
:Superfusion of slices of the dorsal zone of the lumbar enlargement with an artificial cerebrospinal fluid was used to investigate the possible modulation by GABA receptor ligands of the in vitro release of calcitonin gene-related peptide- and substance P-like materials (CGRPLM and SPLM) from the rat spinal cord. Whereas the spontaneous outflow of both peptides remained unaffected, the K+ (30 mM)-evoked overflow of CGRPLM could be partially inhibited (approx. -30%) by GABA (1 microM-0.1 mM) and muscimol (10 microM-0.1 mM) but not by baclofen (1-10 microM). Bicuculline methiodide (1 microM) completely prevented the inhibition by GABA (1 microM) and muscimol (10 microM) as expected from an action through GABAA receptors. By contrast, the K(+)-evoked SPLM overflow was altered neither by GABA nor muscimol and baclofen. These data further support that GABA exerts a presynaptic inhibitory control of (CGRP-containing) primary afferent fibres within the rat dorsal horn.
journal_name
Brain Resjournal_title
Brain researchauthors
Bourgoin S,Pohl M,Benoliel JJ,Mauborgne A,Collin E,Hamon M,Cesselin Fdoi
10.1016/s0006-8993(10)80048-4subject
Has Abstractpub_date
1992-06-26 00:00:00pages
344-8issue
1-2eissn
0006-8993issn
1872-6240pii
S0006-8993(10)80048-4journal_volume
583pub_type
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