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Related Experiment Videos

Developmental toxicity testing with FETAX: evaluation of five compounds.

D A Dawson1, D J Fort, D L Newell

  • 1Department of Zoology, Oklahoma State University, Stillwater 74078.

Drug and Chemical Toxicology
|March 1, 1989
PubMed
Summary

The Frog Embryo Teratogenesis Assay: Xenopus (FETAX) identified strong teratogenic potential in 6-aminonicotinamide, isoniazid, and urethane. Nitrilotriacetate and sodium cyclamate showed minimal teratogenic effects, supporting FETAX as a chemical teratogen screening tool.

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Area of Science:

  • Developmental toxicology
  • Environmental toxicology
  • Comparative toxicology

Background:

  • Chemical teratogens pose risks to embryonic development.
  • Accurate screening assays are crucial for public health and environmental safety.
  • The Frog Embryo Teratogenesis Assay: Xenopus (FETAX) is a model system for evaluating teratogenicity.

Purpose of the Study:

  • To assess the teratogenic potential of five distinct chemical compounds using the FETAX assay.
  • To determine the reliability of FETAX in identifying chemicals with significant teratogenic effects.
  • To compare the teratogenic activity of 6-aminonicotinamide, isoniazid, urethane, nitrilotriacetate, and sodium cyclamate.

Main Methods:

  • Xenopus laevis embryos were exposed to five compounds (6-aminonicotinamide, isoniazid, urethane, nitrilotriacetate, sodium cyclamate) for 96 hours in static-renewal tests.

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  • Teratogenic Index (TI) values were calculated to quantify teratogenic potential.
  • Embryo growth and the type and severity of induced malformations were assessed.

    • Main Results:

    • 6-aminonicotinamide (6-AN), isoniazid (INH), and urethane demonstrated strong teratogenic potential based on TI values and observed malformations.
    • Nitrilotriacetate (NTA) and sodium cyclamate exhibited little to no teratogenic potential.
    • The assay successfully differentiated between compounds with high and low teratogenic risks.

    Conclusions:

    • FETAX is effective in identifying chemical teratogens with high accuracy.
    • The study supports the continued use and validation of FETAX as a screening assay for chemical teratogenicity.
    • Results highlight specific compounds requiring further risk assessment due to their teratogenic capacity.