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- W2018362808 abstract "1. The group II metabotropic glutamate (mGlu) receptor antagonist (2S,1'S,2'S)-2-(2-carboxycyclopropyl)-2-(9H-xanthen-9-yl)glycine (LY341495) also has activity at group I and III mGlu receptors at higher concentrations and can be used to discriminate between mGlu receptor subtypes. We report the antagonist action of LY341495 on glutamate receptors expressed in the neonatal rat spinal cord preparation and the use of this antagonist to investigate the group III mGlu receptor subtypes responsible for mediating the depression of synaptic transmission in the spinal cord mediated by the group III mGlu receptor agonists (S)-2-amino-4-phosphonobutanoic acid ((S)-AP4) and (1S,3R,4S)-1-aminocyclopentane-1,2,4-tricarboxylic acid (ACPT-I). 2. LY341495 antagonised mGlu receptor agonist-induced responses in the spinal cord with a rank order of potency of group II > group III > group I, which is the same as that observed in human cloned mGlu receptor cell lines. Antagonism of group II and III mGlu receptor-mediated effects were time dependent when low-nanomolar concentrations of LY341495 were used. Although the rank order of potency of LY341495 was the same on native rat and cloned human mGlu receptors, there was a compression in the selectivity between group II and III mGlu receptors, expressed in the spinal cord. 3. In agreement with a previous study on cloned ionotropic glutamate receptors 100 microM LY341495 had little or no effect on N-methyl-D-aspartate, (S)-2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl) propionic acid or kainate receptor-mediated responses on motoneurones. 4. LY341495 exhibited low-nanomolar potency antagonist activity against (S)-AP4 and ACPT-I suggesting that these agonists are activating predominantly mGlu8 and that mGlu4 receptors do not play a role in modulating synaptic transmission in the pathways stimulated in the experiments described here." @default.
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- W2018362808 modified "2023-10-14" @default.
- W2018362808 title "Actions of LY341495 on metabotropic glutamate receptor-mediated responses in the neonatal rat spinal cord" @default.
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- W2018362808 doi "https://doi.org/10.1038/sj.bjp.0705230" @default.
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