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Proteomic analysis of haptenation by skin sensitisers: Diphencyprone and ethyl acrylate.
The potential risk of skin sensitisation, associated with the development of allergic contact dermatitis (ACD), is a consideration in the safety assessment of new ingredients for use in personal care products. Protein haptenation in skin by sensitising chemicals is the molecular initiating event causative of skin sensitisation. Current methods for monitoring skin sensitisation rely on limited reactivity assays, motivating interest in the development of proteomic approaches to characterise the skin haptenome. Increasing our mechanistic understanding of skin sensitisation and ACD using proteomics presents an opportunity to develop non-animal predictive methods and/or risk assessment approaches. Previously, we have used a novel stable isotope labelling approach combined with data independent mass spectrometry (HDMSE ) to characterise the haptenome for a number of well-known sensitisers. We have now extended this work by characterising the haptenome of the sensitisers Diphenylcyclopropenone (DPCP) and Ethyl Acrylate (EA) with the model protein Human Serum Albumin (HSA) and the complex lysates of the skin keratinocyte, HaCaT cell line. We show that haptenation in complex nucleophilic models is not random, but a specific, low level and reproducible event. Proteomic analysis extends our understanding of sensitiser reactivity beyond simple reactivity assays and offers a route to monitoring haptenation in living cells.
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