Atypical anti-schizophrenic drugs prevent changes in cortical N-methyl-D-aspartate receptors and behavior following sub-chronic phencyclidine administration in developing rat pups.
We sought to determine the relationship between phencyclidine (PCP)-induced alterations in behavior and NMDAR expression in the cortex by examining the effect of anti-schizophrenic drug treatment on both. Sprague-Dawley rat pups were pretreated with risperidone or olanzapine prior to treatment with PCP on postnatal day 7 (PN7) or sub-chronically on PN7, 9, and 11. Pre-pulse inhibition (PPI) of acoustic startle was measured on PN24-26 and following a challenge dose of 4 mg/kg PCP, locomotor activity was measured on PN28-35. PCP treatment on PN7 did not cause a deficit in PPI, but did cause locomotor sensitization. This was prevented by both antipsychotics. PCP treatment on PN7 caused an up-regulation of NR1 and NR2B, which was not affected by either anti-schizophrenic drug. PCP treatment on PN7, 9, and 11 caused a deficit in PPI and a sensitized locomotor response to PCP challenge as well as an up-regulation of NR1 and NR2A, all of which were prevented by both atypical anti-schizophrenic drugs. These data support the hypothesis that sub-chronic, but not single injection PCP treatment in developing rats results in behavioral alterations that are sensitive to antipsychotic drugs and these behavioral changes observed could be related to up-regulation of cortical NR1/NR2A receptors.
Anastasio
Noelle C
NC
Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, TX 77555-1031, USA.
Johnson
Kenneth M
KM
D000818:Animals; D014150:Antipsychotic Agents / Q000494:pharmacology*; D001522:Behavior, Animal / Q000187:drug effects*; D015153:Blotting, Western; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism*; D015536:Down-Regulation / Q000187:drug effects; D018691:Excitatory Amino Acid Antagonists / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D017072:Neostriatum / Q000187:drug effects / Q000378:metabolism; D010622:Phencyclidine / Q000008:administration & dosage / Q000037:antagonists & inhibitors* / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects*; D013216:Reflex, Startle / Q000187:drug effects; D012559:Schizophrenia / Q000188:drug therapy*; D013347:Subcellular Fractions / Q000187:drug effects
D014150:Antipsychotic Agents; D018691:Excitatory Amino Acid Antagonists; D016194:Receptors, N-Methyl-D-Aspartate; D010622:Phencyclidine