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Valproic acid-induced neural tube defects

¹Institute of Toxicology and Embryopharmacology, Free University, Berlin, Germany.

Ciba Foundation Symposium

|January 1, 1994

Summary

Valproic acid (VPA) use in early pregnancy causes neural tube defects like spina bifida. Researchers found VPA’s teratogenic effects are stereoselective, suggesting drug interactions with chiral embryonic structures.

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Area of Science:

Developmental toxicology
Teratology
Neuroscience

Background:

Valproic acid (VPA) is an antiepileptic drug associated with a 1-2% incidence of human neural tube defects, specifically spina bifida aperta.
VPA induces exencephaly in mice, a defect of anterior neural tube closure, and can also cause spina bifida occulta with specific dosing regimens.

Purpose of the Study:

To investigate the structure-activity relationships of valproic acid's teratogenicity.
To explore the stereoselective nature of VPA's teratogenic effects and potential interactions within the developing embryo.

Main Methods:

Synthesis and teratogenic evaluation of VPA enantiomers in a mouse model.
Analysis of structure-activity relationships to identify key molecular features for teratogenic potency.
Comparison of enantiomer uptake by the embryo to differentiate intrinsic activity.

Main Results:

A specific molecular structure, including an alpha-hydrogen, carboxyl function, and specific branching, is required for high teratogenic potency.
Pairs of VPA enantiomers exhibited significantly different teratogenic potencies.
Enantiomers were taken up by the embryo equally, indicating differing intrinsic teratogenic activity.

Conclusions:

The teratogenicity of valproic acid is stereoselective, implying an interaction with chiral targets within the embryo.
The parent drug, not a metabolite, is likely the proximate teratogen.
Further research is needed to elucidate the molecular mechanism, with a hypothesis involving embryonic folate metabolism.

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