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pubmed-article:2901700pubmed:abstractTextThe rat spinal cord slice preparation has been used to investigate the sensitivity of deep dorsal horn neurones to the excitatory amino acids N-methyl-D-aspartate (NMDA), quisqualate and L-glutamate. Intracellular recordings were made from 44 neurones in laminae III-VI of 14- to 16-day rats. Superfusion of quisqualate (30 microM) excited all neurones, NMDA (50 microM) excited 72% and L-glutamate (0.5-1 mM) 63% of the neurones. Depolarizations were retained after tetrodotoxin but with a reduced amplitude. The NMDA antagonist D-aminophosphonovalerate (D-APV, 10 microM) reduced NMDA and L-glutamate depolarizations by 66% and by 40%, respectively, while the quisqualate responses were enhanced by 27%. Dorsal root stimulation elicited two main patterns of activity; short-latency single/double spikes followed by subthreshold excitatory postsynaptic potentials (EPSPs) or a burst of spikes rising from a long duration composite EPSP. D-APV reduced the long-latency components of the first type and reduced the amplitude and duration of the composite EPSP of the second. These results support a specialized role for NMDA receptors in synaptic transmission in the dorsal horn.lld:pubmed
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pubmed-article:2901700pubmed:articleTitleAn intracellular analysis of amino acid induced excitations of deep dorsal horn neurones in the rat spinal cord slice.lld:pubmed
pubmed-article:2901700pubmed:affiliationDepartment of Anatomy, University College London, U.K.lld:pubmed
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