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• W2054390599 abstract "The group III metabotropic glutamate receptor 7 (mGluR7) has been implicated in many neurological and psychiatric diseases, including drug addiction. However, it is unclear whether and how mGluR7 modulates nucleus accumbens (NAc) dopamine (DA), L-glutamate or gamma-aminobutyric acid (GABA), important neurotransmitters believed to be involved in such neuropsychiatric diseases. In the present study, we found that systemic or intra-NAc administration of the mGluR7 allosteric agonist N,N'-dibenzyhydryl-ethane-1,2-diamine dihydrochloride (AMN082) dose-dependently lowered NAc extracellular GABA and increased extracellular glutamate, but had no effect on extracellular DA levels. Such effects were blocked by (R,S)-alpha-methylserine-O-phosphate (MSOP), a group III mGluR antagonist. Intra-NAc perfusion of tetrodotoxin (TTX) blocked the AMN082-induced increases in glutamate, but failed to block the AMN082-induced reduction in GABA, suggesting vesicular glutamate and non-vesicular GABA origins for these effects. In addition, blockade of NAc GABAB receptors by 2-hydroxy-saclofen itself elevated NAc extracellular glutamate. Intra-NAc perfusion of 2-hydroxy-saclofen not only abolished the enhanced extracellular glutamate normally produced by AMN082, but also decreased extracellular glutamate in a TTX-resistant manner. We interpret these findings to suggest that the increase in glutamate is secondary to the decrease in GABA, which overcomes mGluR7 activation-induced inhibition of non-vesicular glutamate release. In contrast to its modulatory effect on GABA and glutamate, the mGluR7 receptor does not appear to modulate NAc DA release." @default.
• W2054390599 created "2016-06-24" @default.
• W2054390599 creator A5026940576 @default.
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• W2054390599 date "2008-03-01" @default.
• W2054390599 modified "2023-09-28" @default.
• W2054390599 title "The metabotropic glutamate receptor 7 (mGluR7) allosteric agonist AMN082 modulates nucleus accumbens GABA and glutamate, but not dopamine, in rats" @default.
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• W2054390599 doi "https://doi.org/10.1016/j.neuropharm.2007.11.005" @default.
• W2054390599 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2410088" @default.
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