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- W1986247295 abstract "Our experiments demonstrate a novel role for group I metabotropic glutamate receptor (mGluR) subtypes 1 and 5 in generating a long-lasting synaptic excitation in the substantia gelatinosa (SG) and deep dorsal horn (DH) neurons of the rat spinal cord. In the present study we have investigated a slow excitatory postsynaptic current (EPSC), elicited by a brief high intensity (at Adelta/C fiber strength) and high frequency (20 or 100 Hz) stimulation of primary afferent fibers (PAFs) using whole-cell patch-clamp recordings from neurons located in the DH (laminae II-V) in spinal cord slices of young rats and wild-type and gene-targeted mice lacking mGluR1 subtype. The results shown here suggest that the activation of both mGluR1 and mGluR5 along with NK1 receptors, may be involved in the generation of the slow EPSC in the spinal cord DH. Inhibition of glial and neuronal glutamate transporters by DL-threo-beta-benzyloxyaspartate (TBOA) enhanced the group I mGluR-dependent slow EPSC about eightfold. Therefore, we conclude, that glutamate transporters strongly influence the group I mGluR activation by PAFs possibly at sensory synapses in the DH. Overall these data indicate that stimulus trains can generate a sustained and widespread glutamate signal that can further elicit prolonged EPSCs predominantly mediated by the group I mGluRs. These slow excitatory synaptic currents may have important functional implications for DH cell firing and synaptic plasticity of sensory transmission, including nociception." @default.
- W1986247295 created "2016-06-24" @default.
- W1986247295 creator A5025834667 @default.
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- W1986247295 date "2008-07-01" @default.
- W1986247295 modified "2023-09-27" @default.
- W1986247295 title "Involvement of group I metabotropic glutamate receptors and glutamate transporters in the slow excitatory synaptic transmission in the spinal cord dorsal horn" @default.
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