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Morphogenetic systems and screening for embryotoxicity.

R Jelínek, Z Rychter

    Archives of Toxicology. Supplement. = Archiv Fur Toxikologie. Supplement
    |January 1, 1980
    PubMed
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    Teratogenesis targets morphogenetic systems (MGS), not single cells. A new chick embryo screening test (CHEST) effectively assesses embryotoxicity and dose-effect relationships.

    Area of Science:

    • Developmental toxicology
    • Embryology
    • Pharmacology

    Background:

    • Teratogenesis targets morphogenetic systems (MGS), involving cell populations rather than single cells.
    • MGS exhibit dual sensitivity: non-specific to cytotoxic agents during early embryogenesis, and specific to differentiation-linked processes later.
    • Embryotoxicity parameters can be assessed by exposing MGS to test substances and their human metabolites.

    Purpose of the Study:

    • To introduce a rapid, inexpensive screening test for embryotoxicity using the embryonic chick.
    • To evaluate the test's ability to determine effect levels, dose-effect relationships, and the type of embryotoxic action.
    • To propose a multilevel testing strategy incorporating this screening test.

    Main Methods:

    • Development and application of the Chick Embryo Screening Test (CHEST).

    Related Experiment Videos

  • Direct exposure of selected MGS in embryonic chicks to test substances and metabolites.
  • Assessment of embryotoxicity effect level, dose-effect relationships, and action type.

    • Main Results:

    • CHEST demonstrates embryotoxicity effect levels and dose-effect relationships.
    • The test effectively estimates the general type of embryotoxic action.
    • The predictive value of CHEST is comparable to existing routine techniques.

    Conclusions:

    • CHEST is a viable, cost-effective method for initial embryotoxicity screening.
    • The test provides valuable data on dose-response and action type.
    • CHEST can serve as a priority selection system within a multilevel combined test for embryotoxicity.