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Physiologically based models for bone-seeking elements. V. Lead absorption and disposition in childhood

E J O'Flaherty1

  • 1Department of Environmental Health, University of Cincinnati College of Medicine, Ohio 45208-0056, USA.

Toxicology and Applied Pharmacology
|April 1, 1995
PubMed
Summary

This study adapted a lead absorption model for children, showing bone lead levels change rapidly in early childhood but slow down with age. This impacts how children handle lead exposure over time.

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Area of Science:

  • Environmental Health
  • Toxicology
  • Pediatric Health

Background:

  • A physiologically based model for lead absorption and disposition was previously established for adults.
  • Understanding lead kinetics in children is crucial due to their unique developmental stages and higher susceptibility to lead toxicity.

Purpose of the Study:

  • To adapt and validate an existing physiologically based model of lead absorption and disposition for use in children.
  • To incorporate age-dependent changes in bone formation and modeling into the lead disposition model.

Main Methods:

  • Modified a pre-existing adult lead absorption and disposition model.
  • Incorporated age-specific data on bone formation rates and bone modeling localization.
  • Validated the model against childhood blood lead observations.

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Main Results:

  • The adapted model effectively reproduces childhood blood lead concentrations, with exceptions noted for very high lead ingestion scenarios.
  • Bone and blood lead concentrations are highly dynamic in early childhood due to rapid bone turnover, responding quickly to exposure changes.
  • As children age, bone turnover rates decrease, leading to a diminished capacity for rapid reversal of lead accumulation.

Conclusions:

  • The physiologically based model provides a valuable tool for understanding lead pharmacokinetics in children.
  • Children's bone lead dynamics change significantly with age, influencing their susceptibility and response to lead exposure.
  • The model highlights critical developmental periods affecting lead accumulation and detoxification in pediatric populations.