PMID- 36647556 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230131 IS - 2332-1512 (Print) IS - 2332-1539 (Electronic) IS - 2332-1512 (Linking) VI - 8 IP - 4 DP - 2022 Dec 1 TI - Application of Defined Approaches to Assess Skin Sensitization Potency of Isothiazolinone Compounds. PG - 117-128 LID - 10.1089/aivt.2022.0014 [doi] AB - INTRODUCTION: Isothiazolinones (ITs) are widely used as antimicrobial preservatives in cosmetics and as additives for preservation of consumer and industrial products to control bacteria, fungi, and algae. Although they are effective biocides, they have the potential to produce skin irritation and sensitization, which poses a human health hazard. In this project, we evaluated nonanimal defined approaches (DAs) for skin sensitization that can provide point-of-departure estimates for use in quantitative risk assessment for ITs. MATERIALS AND METHODS: The skin sensitization potential of six ITs was evaluated using three internationally harmonized nonanimal test methods: the direct peptide reactivity assay, KeratinoSens, and the human cell line activation test. Results from these test methods were then applied to two versions of the Shiseido Artificial Neural Network DA. RESULTS: Sensitization hazard or potency predictions were compared with those of the in vivo murine local lymph node assay (LLNA). The nonanimal methods produced skin sensitization hazard and potency classifications concordant with those of the LLNA. EC3 values (the estimated concentration needed to produce a stimulation index of three, the threshold positive response) generated by the DAs had less variability than LLNA EC3 values, and confidence limits from the DAs overlapped those of the LLNA EC3 for most substances. CONCLUSION: The application of in silico models to in chemico and in vitro skin sensitization data is a promising data integration procedure for DAs to support hazard and potency classification and quantitative risk assessment. CI - Copyright 2022, Mary Ann Liebert, Inc., publishers. FAU - Strickland, Judy AU - Strickland J AUID- ORCID: 0000-0002-4112-7484 AD - Inotiv, Inc., Morrisville, North Carolina, USA. FAU - Allen, David G AU - Allen DG AD - Inotiv, Inc., Morrisville, North Carolina, USA. FAU - Germolec, Dori AU - Germolec D AD - Division of Translational Toxicology, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA. FAU - Kleinstreuer, Nicole AU - Kleinstreuer N AD - National Toxicology Program Interagency Center for the Evaluation of Alternative Methods, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA. FAU - Johnson, Victor J AU - Johnson VJ AD - Burleson Research Technologies, Inc., Morrisville, North Carolina, USA. FAU - Gulledge, Travis AU - Gulledge T AD - Burleson Research Technologies, Inc., Morrisville, North Carolina, USA. FAU - Truax, Jim AU - Truax J AD - Inotiv, Inc., Morrisville, North Carolina, USA. FAU - Lowit, Anna AU - Lowit A AD - United States Environmental Protection Agency, Office of Pollution Prevention and Toxics, Washington, District of Columbia, USA. FAU - Dole, Timothy AU - Dole T AD - United States Environmental Protection Agency, Office of Pesticide Programs, Washington, District of Columbia, USA. FAU - McMahon, Timothy AU - McMahon T AD - United States Environmental Protection Agency, Office of Pesticide Programs, Washington, District of Columbia, USA. FAU - Panger, Melissa AU - Panger M AD - United States Environmental Protection Agency, Office of Pesticide Programs, Washington, District of Columbia, USA. FAU - Facey, Judy AU - Facey J AD - United States Environmental Protection Agency, Office of Pesticide Programs, Washington, District of Columbia, USA. FAU - Savage, Stephen AU - Savage S AD - United States Environmental Protection Agency, Office of Pesticide Programs, Washington, District of Columbia, USA. LA - eng PT - Journal Article DEP - 20221216 PL - United States TA - Appl In Vitro Toxicol JT - Applied in vitro toxicology JID - 101692723 PMC - PMC9814110 OTO - NOTNLM OT - LLNA OT - artificial neural network OT - nonanimal methodology OT - point of departure OT - risk assessment OT - skin sensitization COIS- D.G.A., J.S., and J.T. are employed by Inotiv, Inc. V.J.J. is employed by Burleson Research Technologies, Inc. T.G. was employed by Burleson Research Technologies, Inc., at the time of the in vitro laboratory work and is now employed by Torque Bio, Inc. The remaining authors, A.L., D.G., T.D., J.F., M.P., T.M., N.K., and S.S., declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. EDAT- 2023/01/18 06:00 MHDA- 2023/01/18 06:01 PMCR- 2022/12/16 CRDT- 2023/01/17 01:47 PHST- 2023/01/17 01:47 [entrez] PHST- 2023/01/18 06:00 [pubmed] PHST- 2023/01/18 06:01 [medline] PHST- 2022/12/16 00:00 [pmc-release] AID - 10.1089/aivt.2022.0014 [pii] AID - 10.1089/aivt.2022.0014 [doi] PST - ppublish SO - Appl In Vitro Toxicol. 2022 Dec 1;8(4):117-128. doi: 10.1089/aivt.2022.0014. Epub 2022 Dec 16.