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Metabolomics as read-across tool: A case study with phenoxy herbicides.

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Summary

Metabolomics data from 28-day studies supported chemical read-across, potentially waiving lengthy 90-day toxicity tests. This approach accurately predicted MCPP toxicity using data from 2,4-DP, demonstrating a viable alternative for substance evaluation.

Keywords:
MetabolomicsPredictionREACHRatRead acrossToxicity

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Area of Science:

  • Toxicology
  • Metabolomics
  • Computational Chemistry

Background:

  • Chemical risk assessment often relies on extensive animal testing.
  • Read-across methodologies aim to reduce animal use by extrapolating data from similar substances.
  • Metabolomics offers a biological perspective to support chemical grouping and read-across.

Purpose of the Study:

  • To evaluate the utility of metabolomics in substantiating read-across for chemical safety assessment.
  • To determine if metabolomics data can support waiving a 90-day toxicity study for MCPP.
  • To identify suitable source substances for read-across to MCPP.

Main Methods:

  • A virtual case study using MCPP as the target substance and MCPA and 2,4-DP as source substances.
  • Metabolomics analysis of blood samples from 28-day toxicity studies.
  • Comparison of metabolomic profiles to assess qualitative and quantitative similarity.
  • Prediction of MCPP toxicity based on 90-day study data of the best-matched source substance (2,4-DP).

Main Results:

  • Metabolomics indicated liver and kidneys as target organs for MCPP, MCPA, and 2,4-DP.
  • 2,4-DP was identified as the most suitable source substance for read-across to MCPP.
  • Predicted MCPP toxicity profile (reduced food consumption, body weight gain, liver/kidney effects, RBC changes) closely matched actual study findings.
  • Predicted NOAEL for MCPP (150 ppm) was similar to the actual NOAEL (≤500 ppm) and NOEL (75 ppm).

Conclusions:

  • Metabolomics data can effectively support chemical read-across by demonstrating biological similarity.
  • The use of metabolomics and read-across can potentially waive the need for 90-day toxicity studies.
  • This approach offers a more efficient and potentially animal-sparing alternative for substance safety evaluation.