Downregulation of oligodendrocyte transcripts is associated with impaired prefrontal cortex function in rats

Justin R. Gregg, Nicole R. Herring, Alipi V. Naydenov, Ryan P. Hanlin, Christine Konradi

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Abnormalities of brain white matter and oligodendroglia are among the most consistent findings in schizophrenia (Sz) research. Various gene expression microarray studies of post-mortem Sz brains showed a downregulation of myelin transcripts, while imaging and microscopy studies demonstrated decreases in prefrontal cortical (PFC) white matter volume and oligodendroglia density. Currently, the extent to which reduced oligodendrocyte markers contribute to pathophysiological domains of Sz is unknown. We exposed adolescent rats to cuprizone (CPZ), a copper chelator known to cause demyelination in mice, and examined expression of oligodendrocyte mRNA transcripts and PFC-mediated behavior. Rats on the CPZ diet showed decreased expression of mRNA transcripts encoding oligodendroglial proteins within the medial PFC, but not in the hippocampus or the striatum. These rats also displayed a specific deficit in the ability to shift between perceptual dimensions in the attentional set-shifting task, a PFC-mediated behavioral paradigm modeled after the Wisconsin Card Sorting Test (WCST). The inability to shift strategies corresponds to the deficits exhibited by Sz patients in the WCST. The results demonstrate that a reduction in oligodendrocyte markers is associated with impaired PFC-mediated behaviors. Thus, CPZ exposure of rats can serve as a model to examine the contribution of oligodendrocyte perturbation to cognitive deficits observed in Sz.

Original languageEnglish (US)
Pages (from-to)277-287
Number of pages11
JournalSchizophrenia Research
Volume113
Issue number2-3
DOIs
StatePublished - Sep 2009
Externally publishedYes

Keywords

  • Adolescence
  • Attentional set-shifting task
  • Hippocampus
  • Oligodendrocytes
  • Prefrontal cortex
  • Schizophrenia

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry

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