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Related Experiment Videos

Valproate robustly enhances AP-1 mediated gene expression

G Chen1, P X Yuan, Y M Jiang

  • 1Laboratory of Molecular Pathophysiology, Department of Psychiatry and Behavioral Neurosciences, WSU School of Medicine, 2301 Scott Hall, 540 E. Canfield Avenue, Detroit, MI 48201, USA. gchen@med.wayne.edu

Brain Research. Molecular Brain Research
|January 16, 1999
PubMed
Summary

Valproic acid (VPA) enhances AP-1 mediated gene expression, suggesting a mechanism for its mood-stabilizing effects in bipolar disorder. This action, similar to lithium, may involve regulating neuronal gene expression for long-term therapeutic benefits.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Valproic acid (VPA) is an anticonvulsant effective for Bipolar Affective Disorder.
  • The precise biochemical mechanisms underlying VPA's mood-stabilizing effects remain unclear.
  • Previous studies indicate VPA increases AP-1 DNA binding activity in vitro.

Purpose of the Study:

  • To investigate whether VPA enhances AP-1 mediated gene expression.
  • To explore the role of AP-1 transcription factors in VPA's therapeutic actions.

Main Methods:

  • Utilized luciferase reporter gene assays in transiently transfected rat C6 glioma and human SH-SY5Y neuroblastoma cells.
  • Employed the pGL2-control vector with an SV40 promoter containing AP-1 binding sites.
  • Assessed VPA's effects on reporter gene expression with and without mutations in the AP-1 binding sites.

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Main Results:

  • VPA significantly increased luciferase activity in a time- and concentration-dependent manner in both cell lines.
  • Mutating the AP-1 binding sites markedly reduced the VPA-induced increase in reporter gene expression.
  • Observed effects were comparable to those previously reported for lithium.

Conclusions:

  • VPA enhances AP-1 mediated gene expression, supporting its role in regulating gene transcription.
  • The findings suggest that modulation of AP-1 activity may contribute to VPA's mood-stabilizing properties.
  • Temporal regulation of AP-1 in neuronal circuits could be crucial for the long-term efficacy of VPA and similar mood stabilizers.