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Updated: Apr 19, 2026

Human Pluripotent Stem Cell Based Developmental Toxicity Assays for Chemical Safety Screening and Systems Biology Data Generation
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Exposure-based validation list for developmental toxicity screening assays.

George P Daston1, Bruce K Beyer, Edward W Carney

  • 1Procter & Gamble, Cincinnati, Ohio.

Birth Defects Research. Part B, Developmental and Reproductive Toxicology
|December 6, 2014
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Summary
This summary is machine-generated.

This study defines chemical exposure levels using toxicokinetic data (maternal plasma Cmax) to classify developmental toxicity. This approach creates a new reference list for evaluating alternative toxicity tests in risk assessment.

Keywords:
developmental toxicityin vitro methodsvalidation

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Area of Science:

  • Toxicology
  • Developmental Biology
  • Pharmacokinetics

Background:

  • Evaluating alternative toxicity assays requires comparing their results with in vivo data.
  • Current in vivo classifications of chemicals as
  • positive
  • or
  • negative
  • do not account for exposure magnitude, which influences developmental toxicity.

Purpose of the Study:

  • To develop a novel reference list for evaluating alternative developmental toxicity tests.
  • To define
  • positive
  • and
  • negative
  • developmental exposures based on toxicokinetic data (maternal plasma Cmax).

Main Methods:

  • Selected 20 chemicals with known developmental toxicity and available toxicokinetic data.
  • Defined
  • positive
  • exposures by maternal plasma Cmax at doses causing teratogenicity or embryolethality.
  • Defined
  • negative
  • exposures by maternal plasma Cmax at doses not causing developmental toxicity.

Main Results:

  • Created a list of 20 chemicals with defined positive and negative developmental exposure levels.
  • Utilized maternal plasma Cmax as the key toxicokinetic parameter for exposure definition.
  • Acknowledged limitations where no-effect level toxicokinetic data were unavailable for some compounds.

Conclusions:

  • An exposure-based reference list, using toxicokinetic data, offers a new paradigm for evaluating alternative toxicity tests.
  • This approach is a step towards the quantitative risk assessment application of alternative testing methods.
  • Refining exposure definitions is crucial for accurate assessment of developmental toxicants.