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Related Experiment Videos

Valproic acid teratogenicity: a toxicogenomics approach.

Kim Kultima1, Anna-Maja Nyström, Birger Scholz

  • 1Department of Pharmaceutical Biosciences, Division of Toxicology, The Biomedical Center, Uppsala University, Uppsala, Sweden.

Environmental Health Perspectives
|September 4, 2004
PubMed
Summary

Valproic acid (VPA) causes birth defects by disrupting embryonic development. This study identified VPA-responsive genes in mouse embryos and P19 cells, revealing potential biomarkers and implicating histone deacetylase (HDAC) inhibition in VPA teratogenicity.

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Area of Science:

  • Developmental toxicology
  • Gene expression analysis
  • Teratology

Background:

  • Embryonic development relies on complex signaling and gene regulatory networks.
  • Disruptions in these networks can lead to chemically induced birth defects.
  • Valproic acid (VPA), an antiepileptic drug, is a known teratogen causing neural tube defects (NTDs).

Purpose of the Study:

  • To investigate the molecular mechanisms underlying VPA-induced teratogenicity.
  • To identify VPA-responsive genes in mouse embryos and a P19 cell model.
  • To explore potential biomarkers for VPA teratogenicity and therapeutic targets.

Main Methods:

  • Microarray analysis was used to compare global gene expression in mouse embryos and P19 embryocarcinoma cells exposed to VPA.

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  • Gene expression profiles were analyzed in vivo during critical developmental stages and in vitro.
  • VPA-responsive genes were identified and their association with NTDs and VPA's known actions was assessed.

    • Main Results:

    • Identified known VPA-responsive genes (e.g., vinculin, metallothioneins) and novel putative targets (e.g., transgelin 2, galectin-1, fatty acid synthase).
    • Several identified genes are involved in neural tube formation and closure.
    • A subset of VPA-responsive genes showed similar transcriptional responses in both embryos and P19 cells, suggesting potential biomarkers.

    Conclusions:

    • VPA teratogenicity may involve disruption of specific gene regulatory pathways.
    • Identified genes offer potential biomarkers for VPA-induced developmental toxicity in vitro assays.
    • Data support histone deacetylase (HDAC) inhibition as a key molecular mechanism of VPA teratogenicity.