Predicting skin sensitisation using a decision tree integrated testing strategy with an in silico model and in chemico/in vitro assays
Owner/Developer: Regulatory Toxicology and Pharmacology
|United States of America
There is a pressing need for non-animal methods to predict skin sensitisation potential and a number of in chemico and in vitro assays have been designed with this in mind. However, some compounds can fall outside the applicability domain of these in chemico/in vitro assays and may not be predicted accurately.
Rule-based in silico models such as Derek Nexus are expert-derived from animal and/or human data and the mechanism-based alert domain can take a number of factors into account (e.g. abiotic/biotic activation). Therefore, Derek Nexus may be able to predict for compounds outside the applicability domain of in chemico/in vitro assays.
To this end, an integrated testing strategy (ITS) decision tree using Derek Nexus and a maximum of two assays (from DPRA, KeratinoSens, LuSens, h-CLAT and U-SENS) was developed. Generally, the decision tree improved upon other ITS evaluated in this study with positive and negative predictivity calculated as 86% and 81%, respectively. Our results demonstrate that an ITS using an in silico model such as Derek Nexus with a maximum of two in chemico/in vitro assays can predict the sensitising potential of a number of chemicals, including those outside the applicability domain of existing non-animal assays.
|Regulatory testing - Toxicological and safety evaluation - Documentation and information
|Cosmetics Regulation (EC) No 1223/2009 - REACH Regulation (EC) No 1907/2006
|Alternative test methods (in vitro) - Non-testing methods (in silico) - Integrated approaches to testing and assessment (IATA)
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