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Journal of Neuroscience, Vol 16, 974-982, Copyright © 1996 by Society for Neuroscience
Colocalization of GABA, glycine, and their receptors at synapses in the rat spinal cord
AJ Todd, C Watt, RC Spike and W Sieghart
Laboratory of Human Anatomy, University of Glasgow, United Kingdom.
To determine whether GABA and glycine can act as cotransmitters at synapses
in the rat spinal cord, we have compared the ultrastructural distribution
of GABAA-receptor beta 3 subunit with that of the glycine
receptor-associated protein gephyrin and combined this with postembedding
detection of GABA and glycine. We also used a dual- immunofluorescence
method to confirm that gephyrin was associated with the glycine-receptor
alpha 1 subunit throughout the cord. GABAA beta 3- subunit immunoreactivity
was restricted primarily to synapses, and at a majority of these synapses
the presynaptic axon was GABA- immunoreactive. Many synapses showed both
GABAA beta 3 and gephyrin immunoreactivity, and at most of these synapses
GABA and glycine were enriched in the presynaptic axon. These results
strongly support the idea that cotransmission by GABA and glycine occurs in
the spinal cord.
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E. Polgar, S. A. S. Shehab, C. Watt, and A. J. Todd
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2637 - 2646.
[Abstract]
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A Dumoulin, P Rostaing, C Bedet, S Levi, M. Isambert, J. Henry, A Triller, and B Gasnier
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