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• W2079388530 abstract "(S)-3,4-Dicarboxyphenylglycine (DCPG) has been tested on cloned human mGlu1-8 receptors individually expressed in AV12-664 cells co-expressing a rat glutamate/aspartate transporter and shown to be a potent and selective mGlu8a receptor agonist (EC(50) value 31+/-2 nM, n=3) with weaker effects on the other cloned mGlu receptors (EC(50) or IC(50) values >3.5 microM on mGlu1-7). Electrophysiological characterisation on the neonatal rat spinal cord preparation revealed that (S)-3,4-DCPG depressed the fast component of the dorsal root-evoked ventral root potential (fDR-VRP) giving a biphasic concentration-response curve showing EC(50) values of 1.3+/-0.2 microM (n=17) and 391+/-81 microM (n=17) for the higher and lower affinity components, respectively. The receptor mediating the high-affinity component was antagonised by 200 microM (S)-alpha-methyl-2-amino-4-phosphonobutyrate (MAP4, K(D) value 5.4+/-1.5 microM (n=3)), a group III metabotropic glutamate (mGlu) receptor antagonist. The alpha-methyl substituted analogue of (S)-3,4-DCPG, (RS)-3,4-MDCPG (100 microM), antagonised the effects of (S)-3,4-DCPG (K(D) value 5.0+/-0.4 microM, n=3) in a similar manner to MAP4. (S)-3,4-DCPG-induced depressions of the fDR-VRP in the low-affinity range of the concentration-response curve were potentiated by 200 microM (S)-alpha-ethylglutamate (EGLU), a group II mGlu receptor antagonist, and were relatively unaffected by MAP4 (200 microM). However, depressions of the fDR-VRP mediated by the AMPA selective antagonist (R)-3,4-DCPG were not potentiated by EGLU, suggesting that the low-affinity component of the concentration-response curve for (S)-3,4-DCPG is not due to antagonism of postsynaptic AMPA receptors. It is suggested that the receptor responsible for mediating the high-affinity component is mGlu8. The receptor responsible for mediating the low-affinity effect of (S)-3,4-DCPG has yet to be identified but it is unlikely to be one of the known mGlu receptors present on primary afferent terminals or an ionotropic glutamate receptor of the AMPA or NMDA subtype." @default.
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• W2079388530 date "2001-03-01" @default.
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• W2079388530 title "(S)-3,4-DCPG, a potent and selective mGlu8a receptor agonist, activates metabotropic glutamate receptors on primary afferent terminals in the neonatal rat spinal cord" @default.
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• W2079388530 doi "https://doi.org/10.1016/s0028-3908(00)00169-6" @default.
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