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- W1566585200 abstract "Intracellular recording techniques have been used to provide information on the identity of excitatory sensory transmitters released at synapses formed between dorsal root ganglion (DRG) and dorsal horn neurons maintained in cell culture. Explants of embryonic rat DRG were added to dissociated cultures of embryonic dorsal horn neurons and synaptic potentials were recorded intracellularly from dorsal horn neurons after DRG explant stimulation. More than 80% of dorsal horn neurons within 1 mm of DRG explants received at least one fast, DRG-evoked, monosynaptic input. In the presence of high divalent cation concentrations, the acidic amino acid receptor agonists, L-glutamate, kainate, and quisqualate excited all dorsal horn neurons which received a monosynaptic DRG neuron input, whereas aspartate and N-methyl-D-aspartate (NMDA) had little or no action. Several compounds reported to antagonize the actions of acidic amino acids were tested for their ability to block DRG-evoked synaptic potentials and glutamate-evoked responses in dorsal horn neurons. 2-Amino-5-phosphonovalerate, a selective NMDA receptor antagonist, was relatively ineffective at antagonizing DRG-evoked synaptic potentials and glutamate-evoked responses. In contrast, kynurenate was found to be a potent antagonist of amino acid-evoked responses and of synaptic transmission at all DRG-dorsal horn synapses examined. The blockade of synaptic transmission by kynurenate appeared to result from a postsynaptic action on dorsal horn neurons. These findings indicate that glutamate, or a glutamate-like compound, but not aspartate, is the excitatory transmitter that mediates fast excitatory postsynaptic potentials at the DRG-dorsal horn synapses examined in this study." @default.
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- W1566585200 date "1985-08-01" @default.
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- W1566585200 title "Synaptic transmission between dorsal root ganglion and dorsal horn neurons in culture: antagonism of monosynaptic excitatory postsynaptic potentials and glutamate excitation by kynurenate" @default.
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- W1566585200 doi "https://doi.org/10.1523/jneurosci.05-08-02281.1985" @default.
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