Different roles of group I and group II metabotropic glutamate receptors on phencyclidine-induced dopamine release in the rat prefrontal cortex.
The dopamine system in the limbic-prefrontal cortex has been assumed to play an important role in the cognitive dysfunction of schizophrenia and phencyclidine (PCP)-induced psychosis. In the present study, the role of metabotropic glutamate (mGlu) receptor subtypes on PCP-induced cortical dopamine release was investigated using the microdialysis technique. Infusion of 50 and 100 microM of non-selective mGlu receptor agonist trans-(1S,3R)-1-amino-1,3-cyclopentanedicarboxylic acid inhibited PCP-induced dopamine release, while the basal dopamine level was not significantly affected. A similar inhibition of PCP-induced dopamine release was observed with 100 and 500 microM of selective group I mGlu receptor agonist, (+)-3-hydroxy-phenylglycine. On the other hand, infusion of 10 microM of selective group II mGlu receptor agonist, 2-(2, 3-dicarboxycyclopropyl)-glycine, enhanced the PCP-induced dopamine increase. These results suggest that group I and II mGlu receptors exert opposite modulations on the PCP-induced dopamine release.
Maeda
Jun
J
Brain Imaging Project, National Institute of Radiological Sciences, 9-1, Anagawa 4-Chome, Inage-ku, Chiba, Japan.
Suhara
Tetsuya
T
Okauchi
Takashi
T
Semba
Jun'ichi
J
D000818:Animals; D000927:Anticonvulsants / Q000494:pharmacology; D003515:Cycloleucine / Q000031:analogs & derivatives* / Q000494:pharmacology; D003521:Cyclopropanes / Q000494:pharmacology; D004298:Dopamine / Q000378:metabolism*; D015259:Dopamine Agents / Q000494:pharmacology*; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D005110:Extracellular Space / Q000378:metabolism; D005998:Glycine / Q000031:analogs & derivatives* / Q000494:pharmacology; D006213:Hallucinogens / Q000494:pharmacology; D008297:Male; D017551:Microdialysis; D018696:Neuroprotective Agents / Q000494:pharmacology; D010622:Phencyclidine / Q000494:pharmacology*; D017397:Prefrontal Cortex / Q000187:drug effects* / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D018094:Receptors, Metabotropic Glutamate / Q000819:agonists / Q000378:metabolism*; D013997:Time Factors
D000927:Anticonvulsants; D003521:Cyclopropanes; D015259:Dopamine Agents; D018691:Excitatory Amino Acid Antagonists; D006213:Hallucinogens; D018696:Neuroprotective Agents; D018094:Receptors, Metabotropic Glutamate; C108822:metabotropic glutamate receptor 2; C104077:metabotropic glutamate receptor type 1; D003515:Cycloleucine; C036361:1-amino-1,3-dicarboxycyclopentane; C082313:2-(2,3-dicarboxycyclopropyl)glycine; D010622:Phencyclidine; D005998:Glycine; D004298:Dopamine