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Donthamsetty S, Forreryd A, Sterchele P, Huang X, Gradin R, Johansson H, Mattson U, Lee I, Api AM, Ladics G. GARDskin dose-response assay and its application in conducting Quantitative Risk Assessment (QRA) for fragrance materials using a Next Generation Risk Assessment (NGRA) framework. Regul Toxicol Pharmacol 2024; 149:105597. [PMID: 38460723 DOI: 10.1016/j.yrtph.2024.105597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 02/10/2024] [Accepted: 03/04/2024] [Indexed: 03/11/2024]
Abstract
Development of New Approach Methodologies (NAMs) capable of providing a No Expected Sensitization Induction Level (NESIL) value remains a high priority for the fragrance industry for conducting a Quantitative Risk Assesment (QRA) to evaluate dermal sensitization. The in vitro GARDskin assay was recently adopted by the OECD (TG 442E) for the hazard identification of skin sensitizers. Continuous potency predictions are derived using a modified protocol that incorporates dose-response measurements. Linear regression models have been developed to predict human NESIL values. The aim of the study was to evaluate the precision and reproducibility of the continuous potency predictions from the GARDskin Dose-Response (DR) assay and its application in conducting QRA for fragrance materials using a Next Generation Risk Assessment (NGRA) framework. Results indicated that the GARDskin Dose-Response model predicted human NESIL values with a good degree of concordance with published NESIL values, which were also reproducible in 3 separate experiments. Using Isocyclocitral as an example, a QRA was conducted to determine its safe use levels in different consumer product types using a NGRA framework. This study represents a major step towards the establishment of the assay to derive NESIL values for conducting QRA evaluations for fragrance materials using a NGRA framework.
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Affiliation(s)
| | | | | | - Xiao Huang
- International Flavors & Fragrances, Hazlet, NJ, USA
| | | | | | | | - Isabelle Lee
- Research Institute for Fragrance Materials, Mahwah, NJ, USA
| | - Anne Marie Api
- Research Institute for Fragrance Materials, Mahwah, NJ, USA
| | - Gregory Ladics
- International Flavors & Fragrances, Wilmington, DE, USA.
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2
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Gao Y, Ryan CA, Ellingson K, Krutz N, Kern PS. A botanical reference set illustrating a weight of evidence approach for skin sensitization risk assessment. Food Chem Toxicol 2024; 184:114413. [PMID: 38128687 DOI: 10.1016/j.fct.2023.114413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/30/2023] [Accepted: 12/18/2023] [Indexed: 12/23/2023]
Abstract
Recent years have seen an increase in the use of botanicals and natural substances (BNS) in consumer products such as cosmetics and household care products. Most work conducted to date to assess botanicals for human safety has focused their use as dietary supplements and thus on systemic toxicity. However, the induction of skin sensitization is a possible adverse effect of natural products in particular those that come into skin contact, especially for cosmetics that remain on the skin and are not rinsed off following use. Assessments of BNS ingredients are often challenging for a number of reasons: the BNS are complex mixtures that can be of mostly unknown composition; the composition can be highly variable even within the same plant species and dependent on how processed; the physical form of the BNS raw material can vary from a highly concentrated powdered extract to a liquid extract containing only a small percentage of the BNS; testing of the BNS raw materials in New Approach Methods (NAM) has uncertainty as these methods are often not developed or validated for complex mixtures. In this study, a reference set of 14 selected BNS which span the range of skin sensitization potential was complied. These data were used in a Weight of Evidence (WoE) approach to evaluate their skin sensitization potential with each of the data rich BNS being classified as either having strong evidence of inducing skin sensitization based on human topical use history, animal data, clinical data, composition data and NAM data, or having some but more limited (weak) evidence of inducing skin sensitization, or having strong evidence of no skin sensitization potential. When available data have sufficient potency related information, sensitization potency assessment is also provided based on WoE, classifying these BNS as either strong, moderate, or weak sensitizers, or non-sensitizers. An outline for a BNS skin sensitization risk assessment framework is proposed starting with exposure-based waiving and WoE assessment for higher exposures. In addition to demonstrating the application of the WoE approach, the reference set presented here provides a set of 'data rich' botanicals which cover a range of sensitization potencies that could be used for evaluating existing test methods or aid in the development of new predictive models for skin sensitization.
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Affiliation(s)
- Yuan Gao
- Procter & Gamble Technology (Beijing) Co., Ltd., Beijing, China.
| | | | - Kim Ellingson
- Procter & Gamble, Mason Business Center, 8700 Mason Montgomery Road, Mason, OH, 45040, USA
| | - Nora Krutz
- Procter & Gamble Services Company NV, Strombeek-Bever, Belgium
| | - Petra S Kern
- Procter & Gamble Services Company NV, Strombeek-Bever, Belgium
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3
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Kolle SN, Flach M, Kleber M, Basketter DA, Wareing B, Mehling A, Hareng L, Watzek N, Bade S, Funk-Weyer D, Landsiedel R. Plant extracts, polymers and new approach methods: Practical experience with skin sensitization assessment. Regul Toxicol Pharmacol 2023; 138:105330. [PMID: 36599391 DOI: 10.1016/j.yrtph.2022.105330] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 12/16/2022] [Accepted: 12/27/2022] [Indexed: 01/02/2023]
Abstract
Over the last decade, research into methodologies to identify skin sensitization hazards has led to the adoption of several non-animal methods as OECD test guidelines. However, predictive accuracy beyond the chemical domains of the individual validation studies remains largely untested. In the present study, skin sensitization test results from in vitro and in chemico methods for 12 plant extracts and 15 polymeric materials are reported and compared to available in vivo skin sensitization data. Eight plant extracts were tested in the DPRA and h-CLAT, with the 2 out of 3 approach resulting in a balanced accuracy of 50%. The balanced accuracy for the 11 plant extracts assessed in the SENS-IS was 88%. Excluding 5 polymers inconclusive in vitro, the remainder, assessed using the 2 out of 3 approach, resulted in 63% balanced accuracy. The SENS-IS method, excluding one polymeric material due to technical inapplicability, showed 68% balanced accuracy. Although based on limited numbers, the results presented here indicate that some substance subgroups may not be in the applicability domains of the method used and careful analysis is required before positive or negative results can be accepted.
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Affiliation(s)
| | | | - Marcus Kleber
- BASF Personal Care and Nutrition GmbH, Duesseldorf, Germany
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Gądarowska D, Kalka J, Daniel-Wójcik A, Mrzyk I. Alternative Methods for Skin-Sensitization Assessment. TOXICS 2022; 10:740. [PMID: 36548573 PMCID: PMC9783525 DOI: 10.3390/toxics10120740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 11/23/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
Skin sensitization is a term used to refer to the regulatory hazard known as allergic contact dermatitis (ACD) in humans or contact hypersensitivity in rodents, an important health endpoint considered in chemical hazard and risk assessments. Information on skin sensitization potential is required in various regulatory frameworks, such as the Directive of the European Parliament and the Council on Registration, Evaluation and Authorization of Chemicals (REACH). The identification of skin-sensitizing chemicals previously required the use of animal testing, which is now being replaced by alternative methods. Alternative methods in the field of skin sensitization are based on the measurement or prediction of key events (KE), i.e., (i) the molecular triggering event, i.e., the covalent binding of electrophilic substances to nucleophilic centers in skin proteins; (ii) the activation of keratinocytes; (iii) the activation of dendritic cells; (iv) the proliferation of T cells. This review article focuses on the current state of knowledge regarding the methods corresponding to each of the key events in skin sensitization and considers the latest trends in the development and modification of these methods.
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Affiliation(s)
- Dominika Gądarowska
- The Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland
- Łukasiewicz Research Network—Institute of Industrial Organic Chemistry Branch Pszczyna, Doświadczalna 27, 43-200 Pszczyna, Poland
| | - Joanna Kalka
- The Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland
| | - Anna Daniel-Wójcik
- Łukasiewicz Research Network—Institute of Industrial Organic Chemistry Branch Pszczyna, Doświadczalna 27, 43-200 Pszczyna, Poland
| | - Inga Mrzyk
- Łukasiewicz Research Network—Institute of Industrial Organic Chemistry Branch Pszczyna, Doświadczalna 27, 43-200 Pszczyna, Poland
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5
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Deng T, Xu X, Fu J, Xu Y, Qu W, Pi J, Wang H. Application of ARE-reporter systems in drug discovery and safety assessment. Toxicol Appl Pharmacol 2022; 454:116243. [PMID: 36115658 DOI: 10.1016/j.taap.2022.116243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 08/16/2022] [Accepted: 09/09/2022] [Indexed: 11/28/2022]
Abstract
The human body is continuously exposed to xenobiotics and internal or external oxidants. The health risk assessment of exogenous chemicals remains a complex and challenging issue. Alternative toxicological test methods have become an essential strategy for health risk assessment. As a core regulator of constitutive and inducible expression of antioxidant response element (ARE)-dependent genes, nuclear factor erythroid 2-related factor 2 (Nrf2) plays a critical role in maintaining cellular redox homeostasis. Consistent with the properties of Nrf2-mediated antioxidant response, Nrf2-ARE activity is a direct indicator of oxidative stress and thus has been used to identify and characterize oxidative stressors and redox modulators. To screen and distinguish chemicals or environmental insults that affect the cellular antioxidant activity and/or induce oxidative stress, various in vitro cell models expressing distinct ARE reporters with high-throughput and high-content properties have been developed. These ARE-reporter systems are currently widely applied in drug discovery and safety assessment. In the present review, we provide an overview of the basic structures and applications of various ARE-reporter systems employed for discovering Nrf2-ARE modulators and characterizing oxidative stressors.
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Affiliation(s)
- Tianqi Deng
- Laboratory of Chronic Disease and Environmental Genomics, School of Public Health, China Medical University, Shenyang 110122, China
| | - Xiaoge Xu
- Laboratory of Chronic Disease and Environmental Genomics, School of Public Health, China Medical University, Shenyang 110122, China
| | - Jingqi Fu
- Program of Environmental Toxicology, School of Public Health, China Medical University, Shenyang 110122, China
| | - Yuanyuan Xu
- Laboratory of Chronic Disease and Environmental Genomics, School of Public Health, China Medical University, Shenyang 110122, China
| | - Weidong Qu
- Key Laboratory of Public Health Safety, Ministry of Education, Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China
| | - Jingbo Pi
- Program of Environmental Toxicology, School of Public Health, China Medical University, Shenyang 110122, China.
| | - Huihui Wang
- Laboratory of Chronic Disease and Environmental Genomics, School of Public Health, China Medical University, Shenyang 110122, China.
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6
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Nishijo T, Api AM, Gerberick GF, Miyazawa M, Na M, Sakaguchi H. Implementation of a dermal sensitization threshold (DST) concept for risk assessment: structure-based DST and in vitro data-based DST. Crit Rev Toxicol 2022; 52:51-65. [PMID: 35416118 DOI: 10.1080/10408444.2022.2033162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Skin sensitization resulting in allergic contact dermatitis represents an important toxicological endpoint as part of safety assessments. When available substance-specific sensitization data are inadequate, the dermal sensitization threshold (DST) concept has been proposed to set a skin exposure threshold to provide no appreciable risk of skin sensitization. Structure-based DSTs, which include non-reactive, reactive, and high potency category (HPC) DSTs, can be applied to substances with an identified chemical structures. An in vitro data-based "mixture DST" can be applied to mixtures based on data from in vitro test methods, such as KeratinoSens™ and the human Cell Line Activation Test. The purpose of this review article is to discuss the practical use of DSTs for conducting sound sensitization risk assessments to assure the safety of consumer products. To this end, several improvements are discussed in this review. For application of structure-based DSTs, an overall structural classification workflow was developed to exclude the possibility that "HPC but non-reactive" chemicals are misclassified as "non-reactive", because such chemicals should be classified as HPC chemicals considering that HPC rules have been based on the chemical structure of high potency sensitizers. Besides that, an extended application of the mixture DST principle to mixtures that either is cytotoxic or evaluated as positive was proposed. On a final note, we also developed workflows that integrate structure-based and in vitro-based mixture DST. The proposed workflows enable the application of the appropriate DST, which serves as a point of departure in the quantitative sensitization risk assessment.
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Affiliation(s)
- Taku Nishijo
- Safety Science Research Laboratories, Kao Corporation, Tochigi, Japan
| | - Anne Marie Api
- Research Institute for Fragrance Materials, Inc, Woodcliff Lake, NJ, USA
| | | | - Masaaki Miyazawa
- Safety Science Research Laboratories, Kao Corporation, Tochigi, Japan
| | - Mihwa Na
- Research Institute for Fragrance Materials, Inc, Woodcliff Lake, NJ, USA
| | - Hitoshi Sakaguchi
- Safety Science Research Laboratories, Kao Corporation, Tochigi, Japan
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Johnson C, Anger LT, Benigni R, Bower D, Bringezu F, Crofton KM, Cronin MT, Cross KP, Dettwiler M, Frericks M, Melnikov F, Miller S, Roberts DW, Suarez-Rodriguez D, Roncaglioni A, Lo Piparo E, Tice RR, Zwickl C, Myatt GJ. Evaluating Confidence in Toxicity Assessments Based on Experimental Data and In Silico Predictions. COMPUTATIONAL TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 21:100204. [PMID: 35368849 PMCID: PMC8967148 DOI: 10.1016/j.comtox.2021.100204] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Understanding the reliability and relevance of a toxicological assessment is important for gauging the overall confidence and communicating the degree of uncertainty related to it. The process involved in assessing reliability and relevance is well defined for experimental data. Similar criteria need to be established for in silico predictions, as they become increasingly more important to fill data gaps and need to be reasonably integrated as additional lines of evidence. Thus, in silico assessments could be communicated with greater confidence and in a more harmonized manner. The current work expands on previous definitions of reliability, relevance, and confidence and establishes a conceptional framework to apply those to in silico data. The approach is used in two case studies: 1) phthalic anhydride, where experimental data are readily available and 2) 4-hydroxy-3-propoxybenzaldehyde, a data poor case which relies predominantly on in silico methods, showing that reliability, relevance, and confidence of in silico assessments can be effectively communicated within Integrated approaches to testing and assessment (IATA).
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Affiliation(s)
- Candice Johnson
- Instem, 1393 Dublin Rd, Columbus, OH 43215, USA,Corresponding author.
(C. Johnson)
| | | | | | - David Bower
- Instem, 1393 Dublin Rd, Columbus, OH 43215, USA
| | | | | | - Mark T.D. Cronin
- School of Pharmacy and Biomolecular Sciences, Liverpool
John Moores University, Liverpool, L3 3AF, UK
| | | | - Magdalena Dettwiler
- Idorsia Pharmaceuticals Ltd, Hegenheimermattweg 91, 4123
Allschwill, Switzerland
| | - Markus Frericks
- BASF SE, APD/ET, Li 444, Speyerer St 2, 67117
Limburgerhof, Germany
| | - Fjodor Melnikov
- Genentech, Inc., 1 DNA Way, South San Francisco, CA,
94080, USA
| | | | - David W. Roberts
- School of Pharmacy and Biomolecular Sciences, Liverpool
John Moores University, Liverpool, L3 3AF, UK
| | | | - Alessandra Roncaglioni
- Laboratory of Environmental Chemistry and Toxicology,
Department of Environmental Health Sciences, Istituto di Ricerche Farmacologiche
Mario Negri IRCCS, Milan, Italy
| | - Elena Lo Piparo
- Chemical Food Safety Group, Nestlé Research,
Lausanne, Switzerland
| | | | - Craig Zwickl
- Transendix LLC, 1407 Moores Manor, Indianapolis, IN
46229, USA
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8
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Shiraishi E, Ishida K, Matsumaru D, Ido A, Hiromori Y, Nagase H, Nakanishi T. Evaluation of the Skin-Sensitizing Potential of Brazilian Green Propolis. Int J Mol Sci 2021; 22:ijms222413538. [PMID: 34948335 PMCID: PMC8704603 DOI: 10.3390/ijms222413538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/09/2021] [Accepted: 12/15/2021] [Indexed: 11/16/2022] Open
Abstract
Propolis is a resinous mixture produced by bees from their secretions and plant material, so its composition varies depending on its botanical origin. Propolis has several beneficial bioactivities, but its skin sensitization properties have long been suspected. Nevertheless, the skin sensitization potency of Brazilian green propolis (BGP) has not been scientifically evaluated. Here, we used scientifically reliable tests to evaluate it. In vitro antigenicity test based on the human cell line activation test (OECD TG 442E) was performed by measuring the expression of CD54 and CD86, which are indicators of the antigenicity of test substances, on THP-1 and DC2.4 cells. BGP did not affect the expression of either marker on THP-1 cells, but upregulated the expression of CD86 on DC2.4 cells, suggesting that BGP may be a skin sensitizer. Then, we performed local lymph node assay (LLNA, OECD TG 429) as a definitive in vivo test. LLNA showed that 1.70% BGP primed skin sensitization and is a "moderate sensitizer". Our results indicate scientific proof of the validity of arbitrary concentrations (1-2%), which have been used empirically, and provide the first scientific information on the safe use of BGP.
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Affiliation(s)
- Erina Shiraishi
- Laboratory of Hygienic Chemistry and Molecular Toxicology, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Gifu, Japan; (E.S.); (K.I.); (D.M.); (A.I.); (Y.H.); (H.N.)
- Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
| | - Keishi Ishida
- Laboratory of Hygienic Chemistry and Molecular Toxicology, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Gifu, Japan; (E.S.); (K.I.); (D.M.); (A.I.); (Y.H.); (H.N.)
| | - Daisuke Matsumaru
- Laboratory of Hygienic Chemistry and Molecular Toxicology, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Gifu, Japan; (E.S.); (K.I.); (D.M.); (A.I.); (Y.H.); (H.N.)
| | - Akiko Ido
- Laboratory of Hygienic Chemistry and Molecular Toxicology, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Gifu, Japan; (E.S.); (K.I.); (D.M.); (A.I.); (Y.H.); (H.N.)
- Faculty of Pharmaceutical Sciences, Gifu University of Medical Science, 4-3-3 Nijigaoka, Kani 509-0293, Gifu, Japan
| | - Youhei Hiromori
- Laboratory of Hygienic Chemistry and Molecular Toxicology, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Gifu, Japan; (E.S.); (K.I.); (D.M.); (A.I.); (Y.H.); (H.N.)
- Faculty of Pharmaceutical Sciences, Suzuka University of Medical Science 3500-3, Minamitamagaki, Suzuka 513-8670, Mie, Japan
| | - Hisamitsu Nagase
- Laboratory of Hygienic Chemistry and Molecular Toxicology, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Gifu, Japan; (E.S.); (K.I.); (D.M.); (A.I.); (Y.H.); (H.N.)
- Faculty of Pharmaceutical Sciences, Gifu University of Medical Science, 4-3-3 Nijigaoka, Kani 509-0293, Gifu, Japan
| | - Tsuyoshi Nakanishi
- Laboratory of Hygienic Chemistry and Molecular Toxicology, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Gifu, Japan; (E.S.); (K.I.); (D.M.); (A.I.); (Y.H.); (H.N.)
- Correspondence: ; Tel.: +81-58-230-8100; Fax: +81-58-230-8117
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9
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Abstract
In the cosmetics industry, various natural complex mixtures such as botanical extracts and essential oils are used. In addition, finished consumer products may contain a number of constituents of natural origin but many products are derived from organic synthesis too. Hence, finding skin sensitizers within this myriad of chemicals is an arduous task. Nowadays, methods validated by European dedicated instances to evaluate the allergenicity of chemicals are incapable of predicting the sensitization potential of complex mixtures, although research has progressed a lot in this direction recently. In this context, precisely identifying the culprit(s) responsible for skin sensitization in these mixtures is essential for risk assessment. This review is a short summary of approaches that identify allergens in chemical mixtures such as bioassay-guided chemical fractionation, structure–activity relationship studies, and recent methods allowing identification of reactive intermediates in natural extracts exposed to air oxidation. It is shown that substantial progress has been made, although the identification of sensitizers in complex mixtures continues to be puzzling.
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Nishijo T, Miyazawa M, Saito K, Otsubo Y, Mizumachi H, Sakaguchi H. The dermal sensitization threshold (DST) approach for mixtures evaluated as negative in in vitro test methods; mixture DST. J Toxicol Sci 2019; 44:23-34. [PMID: 30626777 DOI: 10.2131/jts.44.23] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Cosmetic ingredients often comprise complex mixtures, such as botanical extracts, which may contain skin sensitizing constituents. In our previous study for the sensitivity of the evaluations of skin sensitizing constituents in mixtures using the binary in vitro test battery with KeratinoSensTM and h-CLAT, some sensitizers showed higher detection limits in in vitro test methods than in murine local lymph node assays (LLNA). Thus, to minimize the uncertainty associated with decreased sensitivity for these sensitizers, a risk assessment strategy was developed for mixtures with negative results from the binary test battery. Assuming that the no expected sensitization induction level of mixtures (mixture NESIL) can be derived for mixtures with negative in vitro test results, we assessed 146 sensitizers with in vitro and LLNA data according to the assumption of indeterminate constituents in mixtures. Finally, we calculated 95th percentile probabilities of mixture NESILs and derived dermal sensitization thresholds for mixtures (mixture DST) with negative in vitro test results of 6010 μg/cm2. Feasibility studies indicated that this approach was practical for risk assessments of products in the cosmetic industry. This approach would be a novel risk assessment strategy for incorporating the DST approach and information from in vitro test methods.
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Affiliation(s)
- Taku Nishijo
- Safety Science Research Laboratories, Kao Corporation
| | | | | | - Yuki Otsubo
- Safety Science Research Laboratories, Kao Corporation
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