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Related Experiment Videos

Physiological "constants" for PBPK models for pregnancy

J F Young1, W S Branham, D M Sheehan

  • 1Division of Reproductive and Development Toxicology, National Center for Toxicological Research, Jefferson, Arkansas 72079, USA. JYOUNG@NCTR.FDA.GOV

Journal of Toxicology and Environmental Health
|December 6, 1997
PubMed
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Physiologically based pharmacokinetic (PBPK) models for pregnancy are complex due to changing maternal and fetal tissues. New methods improve early embryo measurements, aiding teratogenesis research in animal models.

Area of Science:

  • Pharmacokinetics and Developmental Toxicology
  • Physiological Modeling
  • Embryology

Background:

  • Physiologically based pharmacokinetic (PBPK) models for pregnancy are more complex than standard models due to dynamic maternal and embryo/fetal tissue growth.
  • Physiological parameters like volume and flow rates change significantly throughout gestation, unlike during acute experiments.
  • While human physiological data is available, similar data for laboratory animals, especially during early organogenesis, is scarce.

Purpose of the Study:

  • To address the complexity of PBPK models in pregnancy.
  • To highlight the data gaps in animal models during critical developmental periods.
  • To introduce advanced imaging techniques for precise early embryo measurements.

Main Methods:

Related Experiment Videos

  • Utilized literature data for human physiological changes during gestation, including Gompertz equation for embryo/fetal growth.
  • Employed allometric modeling to extrapolate data from humans to animals, with validation limited to late embryonic/fetal stages.
  • Applied laser scanning confocal microscopy (LSCM) for precise structural measurements and 3D reconstruction of early embryos.

    • Main Results:

    • Demonstrated that PBPK models for pregnancy require accounting for significant physiological variations.
    • Identified a lack of detailed embryonic and fetal tissue data in rodents during organogenesis.
    • Showcased LSCM's capability for accurate early embryonic structural measurements.

    Conclusions:

    • PBPK models for pregnancy are essential for understanding chemical exposure during development.
    • Accurate data on maternal and embryonic physiological changes are crucial for robust PBPK models.
    • Advanced imaging techniques like LSCM can overcome limitations in measuring early embryonic development, aiding teratogenesis research.