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Related Experiment Videos

Biologically-based dose-response model for neurotoxicity risk assessment.

W Slikker1, A C Scallet, D W Gaylor

  • 1Division of Neurotoxicology, National Center for Toxicological Research/FDA, Jefferson, AR 72079-9502, USA. wslikker@nctr.fda.gov

Toxicology Letters
|February 18, 1999
PubMed
Summary

Domoic acid, a marine toxin, causes brain damage in monkeys. A new quantitative risk assessment method provides a more accurate way to determine safe seafood consumption levels compared to older methods.

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Area of Science:

  • Neurotoxicology
  • Food Safety
  • Risk Assessment

Background:

  • Domoic acid is a neurotoxic amino acid produced by phytoplankton.
  • Contaminated seafood can lead to human exposure and toxicological effects.
  • Understanding domoic acid's toxicity and pathogenesis is crucial for public health.

Purpose of the Study:

  • To determine the toxicological effects and pathogenesis of domoic acid in cynomolgus monkeys.
  • To develop and evaluate a quantitative risk estimation approach for domoic acid exposure.

Main Methods:

  • Intravenous administration of domoic acid to cynomolgus monkeys at varying doses (0.25–4.0 mg/kg).
  • Histochemical staining (silver methods) to identify neuronal damage.
  • Development and application of a four-step quantitative risk estimation model.

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  • Comparison of the quantitative approach with safety-factor (S-F) and benchmark (BM) approaches.

    • Main Results:

    • Domoic acid caused axonal and cell body degeneration in the brain, particularly in the hippocampal CA2 stratum lucidum.
    • A dose-response relationship was established for neuronal damage.
    • The quantitative risk approach yielded different acceptable seafood contamination levels (10 ppm) compared to S-F (12 ppm) and BM (6 ppm), assuming 5% oral absorption.

    Conclusions:

    • The hippocampus is a sensitive target for domoic acid neurotoxicity.
    • The quantitative risk assessment approach is a more comprehensive method, utilizing all data and accounting for variability.
    • This method provides a more accurate estimation of actual risk associated with domoic acid exposure from seafood.