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Related Concept Videos

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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
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Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
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Toxicokinetic Model Development for the Insensitive Munitions Component 2,4-Dinitroanisole.

Lisa M Sweeney1, Michelle R Goodwin2, Angela D Hulgan3

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New insensitive munitions explosives (IMX) use 2,4-Dinitroanisole (DNAN). Toxicokinetic data and PBPK models reveal saturable DNAN metabolism in rats, informing human risk assessments and exposure limits.

Keywords:
2, 4-dinitroanisole2, 4-dinitrophenolinsensitive munitionsphysiologically based pharmacokinetic (PBPK) modeltoxicokinetics

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Area of Science:

  • Chemical Engineering
  • Toxicology
  • Pharmacokinetics

Background:

  • The Armed Forces are developing insensitive munitions (IMX) for enhanced safety.
  • 2,4-Dinitroanisole (DNAN) is a key component in these new explosives.
  • Understanding DNAN toxicokinetics is crucial for human health risk assessment.

Purpose of the Study:

  • To determine the toxicokinetic profile of DNAN and its metabolite DNP in rats.
  • To develop physiologically based pharmacokinetic (PBPK) models for DNAN.
  • To extrapolate rat PBPK models to estimate human exposure levels and inform risk assessment.

Main Methods:

  • Male Sprague-Dawley rats were administered DNAN via gavage at doses of 5, 20, and 80 mg/kg.
  • Blood and tissue samples were analyzed for DNAN and DNP concentrations.
  • Literature data were integrated to develop and refine preliminary PBPK models.

Main Results:

  • DNAN exhibited saturable metabolism in rats at higher tested doses.
  • PBPK model simulations accurately reflected observed DNAN and DNP kinetics.
  • The model facilitated the estimation of human-equivalent no-effect levels for DNAN.

Conclusions:

  • Saturable metabolism of DNAN in rats necessitates careful consideration in risk assessment.
  • PBPK modeling provides a valuable tool for extrapolating animal data to human exposure scenarios.
  • These findings can guide the establishment of safe occupational exposure limits for DNAN.