Abstract
It is widely accepted that individual neurons in the central nervous system release only a single fast transmitter. The possibility of corelease of fast neurotransmitters was examined by making paired recordings from synaptically connected neurons in spinal cord slices. Unitary inhibitory postsynaptic currents generated at interneuron-motoneuron synapses consisted of a strychnine-sensitive, glycine receptor-mediated component and a bicuculline-sensitive, gamma-aminobutyric acid (GABA)A receptor-mediated component. These results indicate that spinal interneurons release both glycine and GABA to activate functionally distinct receptors in their postsynaptic target cells. A subset of miniature synaptic currents also showed both components, consistent with corelease from individual synaptic vesicles.
Publication types
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Comment
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Baclofen / pharmacology
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Bicuculline / pharmacology
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GABA Antagonists
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GABA-A Receptor Antagonists
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GABA-B Receptor Antagonists
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Glycine / metabolism*
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Glycine Agents / pharmacology
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In Vitro Techniques
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Interneurons / drug effects
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Interneurons / metabolism*
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Motor Neurons / drug effects
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Motor Neurons / metabolism*
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Patch-Clamp Techniques
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Presynaptic Terminals / metabolism*
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Rats
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Rats, Wistar
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Receptors, GABA-A / metabolism
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Receptors, GABA-B / metabolism
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Receptors, Glycine / antagonists & inhibitors
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Receptors, Glycine / metabolism
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Spinal Cord / cytology
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Strychnine / pharmacology
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Synaptic Transmission / drug effects
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Synaptic Vesicles / metabolism
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gamma-Aminobutyric Acid / metabolism*
Substances
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GABA Antagonists
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GABA-A Receptor Antagonists
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GABA-B Receptor Antagonists
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Glycine Agents
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Receptors, GABA-A
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Receptors, GABA-B
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Receptors, Glycine
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gamma-Aminobutyric Acid
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Baclofen
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Strychnine
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Glycine
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Bicuculline