A future approach to measuring relative skin sensitising potency: a proposal

Area of Science:

• Toxicology
• Dermatology
• Risk Assessment

Background:

• Effective skin sensitization risk assessment requires data on chemical potency and human exposure.
• The local lymph node assay (LLNA) improved hazard prediction and potency determination but uses animal models.
• There is a growing need for robust, animal-free alternative methods in toxicology.

Purpose of the Study:

• To present a framework for identifying skin sensitizing chemicals.
• To estimate the relative sensitizing potency of chemicals.
• To reduce reliance on animal testing for skin sensitization assessment.

Main Methods:

• Developing an understanding of biological, biochemical, and chemical factors influencing skin sensitization.
• Measuring these factors in vitro.
• Integrating various data sources for hazard characterization.

Main Results:

• The proposed approach theoretically enables identification of skin sensitizing chemicals.
• The framework allows for estimation of relative sensitizing potency.
• Progress is being made in defining alternative experimental strategies that avoid animal use.

Conclusions:

• Accurate characterization of skin sensitization hazards necessitates integrating diverse information sources.
• In vitro measurement of key factors offers a promising alternative to animal testing.
• The presented approach provides a theoretical basis for in vitro skin sensitization assessment.