Abstract:
:In the present study, we investigated the involvement of prefrontal glutamatergic neurotransmission in the enhancement of immobility (emotional deficit) in a forced swimming test in mice treated with phencyclidine (PCP: 10mg/kg/day for 14 days) repeatedly, which is regarded as an animal model for negative symptoms. A decrease in spontaneous extracellular glutamate release and increase in levels of the glutamate transporter GLAST, were observed in the prefrontal cortex (PFC) of PCP-treated mice, compared to saline-treated mice. NMDA receptor subunit 1 (NR1) and Ca(2+)/calmoduline kinase II (CaMKII) were markedly activated in the PFC of saline-treated mice, but not PCP-treated mice, immediately after the forced swimming test. The facilitation of the function of NMDA receptors by d-cycloserine (30mg/kg i.p.), an NMDA receptor glycine-site partial agonist, reversed the enhancement of immobility in the forced swimming test and impairment of CaMKII activation in the PCP-treated mice. Microinjection of dl-threo-beta-benzyloxyaspartate (10nmol/site/bilaterally), a potent blocker of glutamate transporters, into the PFC of PCP-treated mice also had an attenuating effect. In addition, activation of glial cells and a decrease of neuronal cell size were observed in the PFC of PCP-treated mice. These results suggest that repeated PCP treatment disrupts pre- and post-synaptic glutamatergic neurotransmission and induces morphological changes in the PFC and that such changes cause the emotional deficits exhibited in PCP-treated mice.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Murai R,Noda Y,Matsui K,Kamei H,Mouri A,Matsuba K,Nitta A,Furukawa H,Nabeshima Tdoi
10.1016/j.bbr.2007.03.003subject
Has Abstractpub_date
2007-06-18 00:00:00pages
152-60issue
2eissn
0166-4328issn
1872-7549pii
S0166-4328(07)00133-7journal_volume
180pub_type
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