Olfactory learning prevents MK-801-induced psychosis-like behaviour in an animal model of schizophrenia

World J Biol Psychiatry. 2008;9(2):135-46. doi: 10.1080/15622970701286528.

Abstract

There is mounting evidence to support the concept that education is associated with the formation of a functional reserve in the brain, a process that appears to provide some protection against certain aspects of severe central nervous system disorders. The goal of this study was to examine whether learning prevents psychosis-like behaviour in an animal model of schizophrenia. A series of behavioural tasks were used to assess olfactory learning-induced protection against the effects of NMDA channel blocker, MK801. This blocker caused sensory-motor disturbances, spatial learning acquisition deficit, and swimming strategy alterations in pseudo-trained and naive rats, but had a considerably lesser effect on trained rats. In sharp contrast, olfactory learning provided no protection against d-amphetamine application. Our data support the notion that learning-induced protection against schizophrenic behaviour is maintained by non-NMDA-mediated enhanced activation of local connections in the relevant cortical networks.

MeSH terms

  • Animals
  • Disease Models, Animal
  • Dizocilpine Maleate / adverse effects*
  • Excitatory Amino Acid Antagonists / adverse effects*
  • Learning*
  • Male
  • Maze Learning
  • Memory / drug effects
  • Psychoses, Substance-Induced / epidemiology
  • Psychoses, Substance-Induced / etiology*
  • Psychoses, Substance-Induced / prevention & control*
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, N-Methyl-D-Aspartate / drug effects
  • Schizophrenia / epidemiology*
  • Smell*

Substances

  • Excitatory Amino Acid Antagonists
  • Receptors, N-Methyl-D-Aspartate
  • Dizocilpine Maleate