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Related Concept Videos

Toxicity Testing in Animals01:23

Toxicity Testing in Animals

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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Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
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Developmental toxicity study of pentachlorophenol in the rabbit.

B K Bernard1, A K Ranpuria, A M Hoberman

  • 1SRA International, Inc, Washington, DC 20036, USA. bernard@sra-intl.com

International Journal of Toxicology
|January 19, 2002
PubMed
Summary

Pentachlorophenol (penta) was evaluated for developmental toxicity in rabbits. Penta did not demonstrate adverse effects on embryofetal development, indicating it is not a developmental toxicant in this nonrodent model.

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Area of Science:

  • Toxicology
  • Developmental Biology
  • Pharmacology

Background:

  • Pentachlorophenol (penta) is a widely used biocide.
  • Concerns exist regarding its potential for developmental toxicity.
  • Assessing toxicity in animal models is crucial for risk evaluation.

Purpose of the Study:

  • To investigate the developmental toxicity of pentachlorophenol (penta) in a nonrodent mammalian model.
  • To determine the maternal and developmental no-observable-adverse-effect levels (NOAELs).

Main Methods:

  • New Zealand white rabbits were administered penta via gavage from gestation days 6 to 18.
  • Doses ranged from 0 to 30 mg/kg/day.
  • Comprehensive necropsies and fetal examinations were performed on day 29 of gestation.

Main Results:

  • Maternal toxicity, including reduced body weight gain and transient weight loss, was observed at higher doses.
  • No significant effects on embryofetal development (e.g., resorptions, fetal malformations) were noted at any dose.
  • The maternal NOAEL was determined to be 7.5 mg/kg/day, and the developmental NOAEL was 30 mg/kg/day.

Conclusions:

  • Pentachlorophenol (penta) does not exhibit developmental toxicity in New Zealand white rabbits.
  • The study establishes clear NOAELs for maternal and developmental effects.
  • Penta is unlikely to pose a significant risk for developmental toxicity in nonrodent species based on this research.