Cloning and expression of rat metabotropic glutamate receptor 8 reveals a distinct pharmacological profile.
paper
Cited
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Unavailable
- Authors
- Saugstad, J A; Kinzie, J M; Shinohara, M M; Segerson, T P; Westbrook, G L
- Year
- 1997
- Journal
- Molecular pharmacology
- PMID
- 9016353
- DOI
- 10.1124/mol.51.1.119
The metabotropic glutamate receptor (mGluR) cDNAs were originally cloned from rat, except for the mouse cDNA clone encoding mGluR8. Mouse mGluR8 couples weakly to the inhibition of adenylate cyclase, thus hindering the characterization of its pharmacological properties. We isolated a rat mGluR8 cDNA that encodes a protein of 908 amino acids. In situ hybridization revealed prominent mGluR8 mRNA expression in olfactory bulb, pontine gray, lateral reticular nucleus of the thalamus, and piriform cortex. Less abundant expression was detected in cerebral cortex, hippocampus, cerebellum, and mammillary body. Glutamate evoked pertussis toxin-sensitive potassium currents in Xenopus laevis oocytes coexpressing mGluR8 and G protein-coupled inwardly rectifying potassium channels. mGluR8 was also activated by the group III-specific agonist L-2-amino-4-phosphonobutyric acid; (2(S), 1'(S), 2'(S)]- 2-(carboxycyclopropyl)glycine, which has been frequently used as a selective group II agonist; and the nonselective agonist (1(S), 3(R)]-1-aminocyclopentane-1,3-dicarboxylic acid but not by the group I-specific agonist 3,5-dihydroxyphenylglycine or the group II-specific agonist [2(S), 1'(R), 2(R), 3'(R)]-2-(2, 3-dicarboxycyclopropyl)glycine. The agonist profile in order of potency was [2(S), 1'(S), 2'(S)]-2-(carboxycyclopropyl)glycine approximately L-2-amino-4-phosphonobutyric acid > glutamate > > [1(S), 3(R)]-1-aminocyclopentane-1, 3-dicarboxylic acid, with EC50 values of 0.63, 0.67, 2.5, and 47 microM, respectively. Both the group I/II-specific antagonist (R,S)-alpha-methyl-4-carboxyphenylglycine and the group III-specific antagonist alpha-methyl-amino-phosphonobutyrate inhibited mGluR8. The pharmacological profile of mGluR8 is distinct among mGluRs but closely matches that of presynaptic inhibition in some central nervous system pathways. Thus, cellular responses mediated by both group II and III agonists may in some cases reflect activation of mGluR8 rather than multiple mGluR subtypes.
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| Title | Year | PMID |
|---|---|---|
| Association of single nucleotide polymorphisms in a glutamate receptor gene (GRM8) with theta power of event-related oscillations and alcohol dependence. | 2009 | 18618593 |
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