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Teratogenicity screening in standardized chick embryo culture: effects of dexamethasone and diphenylhydantoin

P Kucera1, M B Burnand

  • 1Institute of Physiology, Medical Faculty, University of Lausanne, Switzerland.

Experientia
|October 15, 1988
PubMed

Insights

Dextromethorphan (DXM) and diphenhydramine (DPH) caused developmental defects and toxicity in chick embryos. This chick embryo culture method offers a reliable, animal-sparing screen for teratogenic and toxic drug effects.

Area of Science:

  • Toxicology
  • Developmental Biology
  • Pharmacology

Background:

  • Teratogenic and toxic effects of common medications require thorough investigation.
  • Existing toxicological studies often rely on animal models, raising ethical and practical concerns.

Purpose of the Study:

  • To evaluate the teratogenic and toxic potential of Dextromethorphan (DXM) and Diphenhydramine (DPH) using a chick embryo culture model.
  • To assess the utility of this model as a primary screening tool for drug-induced developmental toxicity.

Main Methods:

  • A standardized chick embryo culture system was employed to expose embryos to varying concentrations of DXM and DPH.
  • Embryonic survival, growth, and the presence of malformations were meticulously scored and analyzed in relation to drug dosage.

Main Results:

  • DXM inhibited extraembryonic blood vessel differentiation and induced craniofacial anomalies at concentrations above 10(-8) mol/l.
  • DPH exposure led to cardiomegaly and craniofacial/somitic anomalies at concentrations greater than 1.5 x 10(-5) mol/l.
  • Both drugs exhibited lethal effects at 10(-3) mol/l, and the method demonstrated good discriminative power and specificity across eight tested drugs.

Conclusions:

  • The chick embryo culture method is a simple, reliable, and economical primary screening test for teratogenic and toxic drug effects.
  • This approach can significantly reduce the reliance on animal testing in early-stage toxicological evaluations.
  • DXM and DPH possess distinct teratogenic profiles, highlighting the sensitivity of the chick embryo model in detecting specific developmental abnormalities.

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