Applicability of an Integrated Testing Strategy consisting of in silico, in chemico and in vitro assays for evaluating the skin sensitization potencies of isocyanates

Toxicology
Toshiyuki OhtakeMasahiro Takeyoshi

Abstract

The skin sensitization potential of chemicals has been traditionally assessed using regulatory accepted in vivo methods, such as guinea pig maximization test or mouse local lymph node assays (LLNAs). A huge effort to reduce and replace the use of animals for safety assessments of chemicals because of regulatory requirements and ethical issues is presently underway, and alternative non-animal methods have been greatly developed. So far, a few studies have investigated the sensitization potencies of isocyanates which is a group of highly reactive chemicals that are known to be occupational allergens. The present study evaluated nine commonly used isocyanates using an in vivo LLNA and assessed the applicability of an Integrated Testing Strategy (ITS) consisting of an in silico Derek Nexus prediction, an in chemico direct peptide reactivity assay (DPRA), and an in vitro human Cell Line Activation Test (h-CLAT) to isocyanates. All nine isocyanates were evaluated as positive using the LLNA, Derek Nexus and DPRA, whereas seven chemicals tested positive using the h-CLAT: hexamethylene diisocyanate tested negative, and 1,5-diisocyanatonaphthalene could not be examined because of a solubility issue. When assessed using the ITS, the posit...Continue Reading

Citations

May 22, 2021·Frontiers in Pharmacology·Giang Huong TaMax K Leong
Jun 18, 2021·Regulatory Toxicology and Pharmacology : RTP·Emanoela Lundgren TháDaniela Morais Leme

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