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The Potent, Selective mGlu2/3 Receptor Agonist LY379268 Increases Extracellular Levels of Dopamine, 3,4‐Dihydroxyphenylacetic Acid, Homovanillic Acid, and 5‐Hydroxyindole‐3‐Acetic Acid in the Medial Prefrontal Cortex of the Freely Moving Rat
Author(s) -
Cartmell Jayne,
Perry Kenneth W.,
Salhoff Craig R.,
Monn James A.,
Schoepp Darryle D.
Publication year - 2000
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1046/j.1471-4159.2000.0751147.x
Subject(s) - homovanillic acid , dopamine , chemistry , dopaminergic , agonist , medicine , endocrinology , microdialysis , 3,4 dihydroxyphenylacetic acid , receptor antagonist , psychology , receptor , serotonin , antagonist , biochemistry , biology
Previous work has shown that the potent, selective metabotropic glutamate mGlu2/3 receptor agonist LY379268 acts like the atypical antipsychotic clozapine in behavioral assays. To investigate further the potential antipsychotic actions of this agent, we examined the effects of LY379268 using microdialysis in awake, freely moving rats, on extracellular levels of dopamine, 3,4‐dihydroxyphenylacetic acid (DOPAC), homovanillic acid (HVA), and 5‐hydroxyindole‐3‐acetic acid (5‐HIAA) in rat medial prefrontal cortex. Systemic LY379268 increased extracellular levels of dopamine, DOPAC, HVA, and 5‐HIAA in a dose‐dependent, somewhat delayed manner. LY379268 (3 mg/kg s.c.) increased levels of dopamine, DOPAC, HVA, and 5‐HIAA to 168, 170, 169, and 151% of basal, respectively. Clozapine (10 mg/kg) also increased dopamine, DOPAC, and HVA levels, with increases of 255, 262, and 173%, respectively, but was without effect on extracellular 5‐HIAA levels by 3 mg/kg LY379268 were reversed by the selective mGlu2/3 receptor antagonist LY341495 (1 mg/kg). Furthermore, LY379268 (3 mg/kg)‐evoked increases in DOPAC and HVA were partially blocked and the increase in 5‐HIAA was completely blocked by local application of 3 μ M tetrodotoxin. Therefore, we have demonstrated that mGlu2/3 receptor agonists activate dopaminergic and serotonergic brain pathways previously associated with the action of atypical antipsychotics such as clozapine and other psychiatric agents.