Caspase-3 activation in rat frontal cortex following treatment with typical and atypical antipsychotics.

Published

Journal Article

In schizophrenia, studies indicate that apoptotic susceptibility in cortex may be increased. A role for apoptosis in schizophrenia could potentially contribute to post-mortem evidence of reduced cortical neuropil and neuroimaging studies showing progressive cortical gray matter loss. Interestingly, antipsychotic treatment has been associated with higher cortical levels of anti-apoptotic Bcl-2 protein in rat cortex and preliminary data has suggested a similar association in schizophrenia and bipolar disorder. To better understand the effects of antipsychotics on apoptotic regulation, rats were administered haloperidol, clozapine, quetiapine, or saline daily for 4 weeks. Multiple apoptotic markers, including Bcl-2, pro-apoptotic Bax, anti-apoptotic XIAP, and the downstream protease caspase-3 were measured in frontal cortex using Western blot. Caspase-3 activity, activated caspase-3-positive cell number, and DNA/histone fragmentation levels were also determined. Western blot showed that immunoreactivity of Bax and Bcl-2 bands were unchanged with treatment. However, mean density of the 19 kD activated caspase-3 band was 55% higher with haloperidol (p<0.001), 40% higher with clozapine (p<0.05), and 48% higher with quetiapine (p<0.01) compared to saline control. Specific activity of caspase-3 was also increased across all treatments (p<0.0001), while DNA fragmentation rates remained unchanged. These data suggest that sub-chronic antipsychotic treatment is associated with non-lethal caspase-3 activity. The findings do not support a prominent Bcl-2-mediated neuroprotective role for antipsychotics. Although the association between antipsychotic treatment and increased pro-apoptotic caspase-3 is intriguing, further study is needed to understand its potential effects.

Full Text

Duke Authors

Cited Authors

  • Jarskog, LF; Gilmore, JH; Glantz, LA; Gable, KL; German, TT; Tong, RI; Lieberman, JA

Published Date

  • January 1, 2007

Published In

Volume / Issue

  • 32 / 1

Start / End Page

  • 95 - 102

PubMed ID

  • 16641945

Pubmed Central ID

  • 16641945

International Standard Serial Number (ISSN)

  • 0893-133X

Digital Object Identifier (DOI)

  • 10.1038/sj.npp.1301074

Language

  • eng

Conference Location

  • England