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Updated: Jul 2, 2025

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices
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The skin sensitization adverse outcome pathway: exploring the role of mechanistic understanding for higher tier risk

Maja Aleksic1, Ramya Rajagopal1, Renato de-Ávila1

  • 1Safety and Environmental Assurance Centre, Unilever, Sharnbrook, UK.

Critical Reviews in Toxicology
|February 22, 2024
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Summary

The skin sensitization Adverse Outcome Pathway (AOP) has guided new assay development for over a decade. Recent research provides deeper mechanistic insights to enhance skin sensitization risk assessment.

Keywords:
Skin sensitizationallergyantigenhaptenmechanistic insightsnew approach methodologiesreactivityrisk assessment

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Area of Science:

  • Toxicology
  • Dermatology
  • Chemical Safety

Background:

  • The skin sensitization Adverse Outcome Pathway (AOP) has been a foundational framework for over ten years.
  • It has driven the development of novel in chemico and in vitro assays for hazard and risk assessment.
  • Significant efforts have focused on assay validation, reproducibility, and data interpretation.

Purpose of the Study:

  • To review recent advances in understanding the molecular mechanisms of skin sensitization.
  • To explore how new mechanistic evidence can complement existing risk assessment tools.
  • To identify promising research avenues for developing improved skin sensitization assays.

Main Methods:

  • Literature review of recent scientific advances in skin sensitization research.
  • Analysis of molecular and dynamic insights into key sensitization events.
  • Evaluation of the utility of mechanistic data for risk assessment.

Main Results:

  • The AOP framework has successfully stimulated assay development and validation.
  • Research has yielded new molecular and dynamic insights into skin sensitization.
  • Mechanistic evidence offers potential to refine current risk assessment strategies.

Conclusions:

  • The skin sensitization AOP remains a valuable framework, enhanced by a decade of research.
  • Emerging mechanistic understanding can significantly improve the accuracy and efficiency of risk assessment.
  • Further research should focus on translating these insights into practical assay development.