title: Effect of acute and chronic MK-801 administration on extracellular glutamate and ascorbic acid release in the prefrontal cortex of freely moving mice on line with open-field behavior.
abstract: The present study was designed to investigate the effects of acute and chronic administration of MK-801 (0.6 mg/kg), a noncompetitive NMDA-receptor antagonist on extracellular glutamate (Glu) and ascorbic acid (AA) release in the prefrontal cortex (PFC) of freely moving mice using in vivo microdialysis with open-field behavior. In line with earlier studies, acute administration of MK-801 induced an increase of Glu in the PFC. We also observed single MK-801 treatment increased AA release in the PFC. In addition, our results indicated that the basal AA levels in the PFC after MK-801 administration for 7 consecutive days were significantly decreased, and basal Glu levels also had a decreased tendency. After chronic administration (0.6 mg/kg, 7 days), MK-801 (0.6 mg/kg) challenge significantly decreased dialysate levels of AA and Glu. Our study also found that both acute and chronic administration of MK-801 induced hyperactivity in mice, but the intensity of acute administration was more than that of chronic administration. Furthermore, in all acute treatment mice, individual changes in Glu dialysate concentrations and the numbers of locomotion were positively correlated. In conclusion, this study may provide new evidence that a single MK-801 administration induces increases of dialysate AA and Glu concentrations in the PFC of freely moving mice, which are opposite to those induced by repeated MK-801 administration, with an unknown mechanism. Our results suggested that redox-response might play an important role in the model of schizophrenic symptoms induced by MK-801.
authors.affiliation: Department of Pharmacology, Shenyang Pharmaceutical University, China.
authors.forename: Dai-Ying
authors.initials: DY
authors.lastname: Zuo
authors.forename: Ya-Hong
authors.initials: YH
authors.lastname: Zhang
authors.forename: Yue
authors.initials: Y
authors.lastname: Cao
authors.forename: Chun-Fu
authors.initials: CF
authors.lastname: Wu
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Tanaka
authors.forename: Ying-Liang
authors.initials: YL
authors.lastname: Wu
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000378:metabolism*; D001522:Behavior, Animal / Q000187:drug effects; D016291:Dizocilpine Maleate / Q000008:administration & dosage / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D018691:Excitatory Amino Acid Antagonists / Q000008:administration & dosage / Q000494:pharmacology*; D018698:Glutamic Acid / Q000378:metabolism*; D008297:Male; D051379:Mice; D017551:Microdialysis; D009043:Motor Activity / Q000187:drug effects*; D017397:Prefrontal Cortex / Q000187:drug effects* / Q000378:metabolism
chemical_list: D018691:Excitatory Amino Acid Antagonists; D018698:Glutamic Acid; D016291:Dizocilpine Maleate; D001205:Ascorbic Acid