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Chronic olanzapine or fluoxetine administration increases cell proliferation in hippocampus and prefrontal cortex of adult rat

  • Masafumi Kodama
    Affiliations
    Division of Molecular Psychiatry, Departments of Psychiatry and Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
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  • Takashi Fujioka
    Affiliations
    Division of Molecular Psychiatry, Departments of Psychiatry and Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
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  • Ronald S. Duman
    Correspondence
    Address reprint requests to Dr. Ronald S. Duman, Yale University School of Medicine, Division of Molecular Psychiatry, 34 Park Street, New Haven, CT 06508
    Affiliations
    Division of Molecular Psychiatry, Departments of Psychiatry and Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
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Published:September 06, 2004DOI:https://doi.org/10.1016/j.biopsych.2004.07.008

      Background

      There has been increasing evidence that atypical antipsychotics are effective in the treatment of mood disorders or for augmenting 5-hydroxytryptamine selective reuptake inhibitors for treatment-resistant depression.

      Methods

      Upregulation of neurogenesis in the adult hippocampus is a marker of antidepressant activity, and the present study investigated the influence of the atypical antipsychotic drug olanzapine on cell proliferation in the hippocampus of adult rat. The regulation of cell proliferation in the prelimbic cortex of adult rat was also examined.

      Results

      Chronic (21 days) olanzapine administration increased the number of newborn cells in the dentate gyrus of the hippocampus to the same extent as fluoxetine. Olanzapine or fluoxetine treatment also increased the number of proliferating cells in the prelimbic cortex. In contrast, there was no effect of either drug in the subventricular zone or primary motor cortex, and there was a trend for an increase in the striatum. Subchronic (7 days) administration of olanzapine had no effect on cell proliferation in hippocampus or prelimbic cortex, consistent with the time course for the effect of fluoxetine and the therapeutic actions of antidepressant treatment. The combination of olanzapine plus fluoxetine did not result in a greater induction of cell proliferation in either brain region. Analysis of the cell phenotype demonstrated that approximately 20% of the newborn cells in the prelimbic cortex differentiated into endothelial cells but not neurons, in contrast to the dentate gyrus, where most newborn cells differentiated into neurons.

      Conclusions

      The results demonstrate that antidepressant or atypical antipsychotic medications can increase the proliferation of glia in limbic brain structures, an effect that could reverse the loss of glia that has been observed in depressed patients.

      Key words

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      • Erratum
        Biological PsychiatryVol. 57Issue 2
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          There is an error in Table 2 within Kodama et al “Chronic Olanzapine or Fluoxetine Administration Increases Cell Proliferation in Hippocampus and Prefrontal Cortex of Adult Rats” Biological Psychiatry 56:570–580. The incorrect footnote is listed under column headings “Atypical APD” and “Typical APD” across from the row “Subventricular Zone.” Footnote e should replace footnote b in both instances. The corrected table appears below.
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