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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The novel metabotropic glutamate receptor agonist 2R,4R-APDC potentiates stimulation of phosphoinositide hydrolysis in the rat hippocampus by 3,5-dihydroxyphenylglycine: evidence for a synergistic interaction between group 1 and group 2 receptors.

The mGlu receptor subtypes and second messenger pathways that mediate 1S,3R-1-aminocyclopentane-1,3-dicarboxylic acid (1S,3R-ACPD) responses in brain tissues are not fully understood. 1S,3R-ACPD differs from 3,5-dihydroxyphenylglycine (DHPG) or quisqualate in that 1S,3R-ACPD also activates group 2 mGlu receptors (mGlu2 and mGlu3) that are negatively linked to cAMP formation. To investigate the contribution of group 2 mGlu receptor activity of 1S,3R-ACPD to the phosphoinositide response in the rat hippocampus, we examined the effects of the novel group 2 mGlu receptor agonist 2R,4R-4-aminopyrrolidine-2,4-dicarboxylate (2R,4R-APDC). 2R,4R-APDC did not activate or inhibit group 1 mGlu receptors (human mGlu1 alpha and mGlu5a) or group 3 mGlu receptors (human mGlu4 and mGlu7), but potently decreased forskolin-stimulated cAMP formation in human mGlu2- and mGlu3-expressing cells. In slices of the adult rat hippocampus 2R,4R-APDC had no effect on basal phosphoinositide hydrolysis; however, it was found to greatly enhance phosphoinositide hydrolysis to DHPG or quisqualate. In the neonatal rat hippocampus, 2R,4R-APDC enhanced the potency of DHPG, while not affecting the maximal response to group 1 mGlu receptor agonists. Thus, the phosphoinositide response in the rat hippocampus to 1S,3R-ACPD is mediated by a synergistic interaction between group 1 and group 2 mGlu receptors.[1]


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