Abstract
Advances in the understanding of the immunobiology of skin sensitization have led to the establishment of predictive in vivo tests which not only identify sensitizing hazards but also characterize their potency. Recently, appreciation of the underlying biology has also resulted in the development of mechanistically based in vitro alternatives which offer the prospect of the replacement of current in vivo methods. Assays under active validation include the Direct Peptide Reactivity Assay (DPRA), the human Cell Line Activation Test (h-CLAT), and KeratinoSens. None of the methods have a sufficient level of accuracy or freedom from applicability domain limitations to allow them to act as a standalone replacement. Consequently, it will be necessary to consider how to deploy these assays, perhaps in combination and/or in a structured assessment of skin sensitization hazard, to ensure at least the same level of predictive accuracy as the in vivo methods. However, a challenge remains: the capacity of these methods to provide potency information on skin-sensitizing chemicals has yet to be assessed. This is an essential requirement for future risk assessment without use of animal models if we are to retain the same level of human health protection that is currently delivered.
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Basketter, D., Casati, S. (2014). Dermal Toxicity: Skin Sensitization. In: Bal-Price, A., Jennings, P. (eds) In Vitro Toxicology Systems. Methods in Pharmacology and Toxicology. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-0521-8_10
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