1
|
Hargitai R, Parráková L, Szatmári T, Monfort-Lanzas P, Galbiati V, Audouze K, Jornod F, Staal YCM, Burla S, Chary A, Gutleb AC, Lumniczky K, Vandebriel RJ, Gostner JM. Chemical respiratory sensitization-Current status of mechanistic understanding, knowledge gaps and possible identification methods of sensitizers. FRONTIERS IN TOXICOLOGY 2024; 6:1331803. [PMID: 39135743 PMCID: PMC11317441 DOI: 10.3389/ftox.2024.1331803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 05/27/2024] [Indexed: 08/15/2024] Open
Abstract
Respiratory sensitization is a complex immunological process eventually leading to hypersensitivity following re-exposure to the chemical. A frequent consequence is occupational asthma, which may occur after long latency periods. Although chemical-induced respiratory hypersensitivity has been known for decades, there are currently no comprehensive and validated approaches available for the prospective identification of chemicals that induce respiratory sensitization, while the expectations of new approach methodologies (NAMs) are high. A great hope is that due to a better understanding of the molecular key events, new methods can be developed now. However, this is a big challenge due to the different chemical classes to which respiratory sensitizers belong, as well as because of the complexity of the response and the late manifestation of symptoms. In this review article, the current information on respiratory sensitization related processes is summarized by introducing it in the available adverse outcome pathway (AOP) concept. Potentially useful models for prediction are discussed. Knowledge gaps and gaps of regulatory concern are identified.
Collapse
Affiliation(s)
- Rita Hargitai
- Unit of Radiation Medicine, Department of Radiobiology and Radiohygiene, National Centre for Public Health and Pharmacy (NCPHP), Budapest, Hungary
| | - Lucia Parráková
- Biochemical Immunotoxicology Group, Institute of Medical Biochemistry, Medical University of Innsbruck (MUI), Innsbruck, Austria
| | - Tünde Szatmári
- Unit of Radiation Medicine, Department of Radiobiology and Radiohygiene, National Centre for Public Health and Pharmacy (NCPHP), Budapest, Hungary
| | - Pablo Monfort-Lanzas
- Biochemical Immunotoxicology Group, Institute of Medical Biochemistry, Medical University of Innsbruck (MUI), Innsbruck, Austria
- Institute of Bioinformatics, Medical University of Innsbruck (MUI), Innsbruck, Austria
| | - Valentina Galbiati
- Laboratory of Toxicology, Department of Pharmacological and Biomolecular Sciences “Rodolfo Paoletti”, Università Degli Studi di Milano (UNIMI), Milano, Italy
| | | | | | - Yvonne C. M. Staal
- Centre for Health Protection, National Institute of Public Health and the Environment (RIVM), Bilthoven, Netherlands
| | - Sabina Burla
- Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg
| | - Aline Chary
- Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg
| | - Arno C. Gutleb
- Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg
| | - Katalin Lumniczky
- Unit of Radiation Medicine, Department of Radiobiology and Radiohygiene, National Centre for Public Health and Pharmacy (NCPHP), Budapest, Hungary
| | - Rob J. Vandebriel
- Centre for Health Protection, National Institute of Public Health and the Environment (RIVM), Bilthoven, Netherlands
| | - Johanna M. Gostner
- Biochemical Immunotoxicology Group, Institute of Medical Biochemistry, Medical University of Innsbruck (MUI), Innsbruck, Austria
| |
Collapse
|
2
|
Chiu YW, Tung CW, Wang CC. Multitask learning for predicting pulmonary absorption of chemicals. Food Chem Toxicol 2024; 185:114453. [PMID: 38244667 DOI: 10.1016/j.fct.2024.114453] [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: 10/16/2023] [Revised: 12/31/2023] [Accepted: 01/11/2024] [Indexed: 01/22/2024]
Abstract
Pulmonary absorption is an important route for drug delivery and chemical exposure. To streamline the chemical assessment process for the reduction of animal experiments, several animal-free models were developed for pulmonary absorption research. While Calu-3 and Caco-2 cells and their derived computational models were used in estimating pulmonary permeability, the ex vivo isolated perfused lung (IPL) models are considered more clinically relevant measurements. However, the IPL experiments are resource-consuming making it infeasible for the large-scale screening of potential inhaled toxicants and drugs. In silico models are desirable for estimating pulmonary absorption. This study presented a novel machine learning method that employed an extratrees-based multitask learning approach to predict the IPL absorption rate constant (kaIPL) of various chemicals. The shared permeability knowledge was extracted by simultaneously learning three relevant tasks of Caco-2 and Calu-3 cell permeability and IPL absorption rate. Seven informative physicochemical descriptors were identified. A rigorous evaluation of the developed prediction model showed good performance with a high correlation between predictions and observations (r = 0.84) in the independent test dataset. Two case studies of inhalation drugs and respiratory sensitizers revealed the potential application of this model, which may serve as a valuable tool for predicting pulmonary absorption of chemicals.
Collapse
Affiliation(s)
- Yu-Wen Chiu
- Department and Institute of Veterinary Medicine, School of Veterinary Medicine, National Taiwan University, Taipei, 106, Taiwan
| | - Chun-Wei Tung
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Miaoli County, 350, Taiwan.
| | - Chia-Chi Wang
- Department and Institute of Veterinary Medicine, School of Veterinary Medicine, National Taiwan University, Taipei, 106, Taiwan.
| |
Collapse
|
3
|
Pemberton MA, Arts JH, Kimber I. Identification of true chemical respiratory allergens: Current status, limitations and recommendations. Regul Toxicol Pharmacol 2024; 147:105568. [PMID: 38228280 DOI: 10.1016/j.yrtph.2024.105568] [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: 11/05/2023] [Revised: 01/06/2024] [Accepted: 01/13/2024] [Indexed: 01/18/2024]
Abstract
Asthma in the workplace is an important occupational health issue. It comprises various subtypes: occupational asthma (OA; both allergic asthma and irritant-induced asthma) and work-exacerbated asthma (WEA). Current regulatory paradigms for the management of OA are not fit for purpose. There is therefore an important unmet need, for the purposes of both effective human health protection and appropriate and proportionate regulation, that sub-types of work-related asthma can be accurately identified and classified, and that chemical respiratory allergens that drive allergic asthma can be differentiated according to potency. In this article presently available strategies for the diagnosis and characterisation of asthma in the workplace are described and critically evaluated. These include human health studies, clinical investigations and experimental approaches (structure-activity relationships, assessments of chemical reactivity, experimental animal studies and in vitro methods). Each of these approaches has limitations with respect to providing a clear discrimination between OA and WEA, and between allergen-induced and irritant-induced asthma. Against this background the needs for improved characterisation of work-related asthma, in the context of more appropriate regulation is discussed.
Collapse
Affiliation(s)
| | | | - Ian Kimber
- Faculty of Biology, Medicine and Health, University of Manchester, UK
| |
Collapse
|
4
|
Overdahl KE, Tighe RM, Stapleton HM, Ferguson PL. Investigating sensitization activity of azobenzene disperse dyes via the Direct Peptide Reactivity Assay (DPRA). Food Chem Toxicol 2023; 182:114108. [PMID: 37890762 PMCID: PMC10872524 DOI: 10.1016/j.fct.2023.114108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/13/2023] [Accepted: 10/16/2023] [Indexed: 10/29/2023]
Abstract
Azobenzene disperse dyes are the fastest-growing category of commercial dyestuffs and have been found in indoor house dust and in children's polyester apparel. Azobenzene disperse dyes are implicated as potentially allergenic; however, little experimental data is available on allergenicity of these dyes. Here, we examine the binding of azobenzene disperse dyes to nucleophilic peptide residues as a proxy for their potential reactivity as electrophilic allergenic sensitizers. The Direct Peptide Reactivity Assay (DPRA) was utilized via both a spectrophotometric method and a high-performance liquid chromatography (HPLC) method. We tested dyes purified from commercial dyestuffs as well as several known transformation products. All dyes were found to react with nucleophilic peptides in a dose-dependent manner with pseudo-first order kinetics (rate constants as high as 0.04 h-1). Rates of binding reactivity were also found to correlate to electrophilic properties of dyes as measured by Hammett constants and electrophilicity indices. Reactivities of polyester shirt extracts were also tested for DPRA activity and the shirt extracts with high measured abundances of azobenzene disperse dyes were observed to induce greater peptide reactivity. Results suggest that azobenzene disperse dyes may function as immune sensitizers, and that clothing containing these dyes may pose risks for skin sensitization.
Collapse
Affiliation(s)
- Kirsten E Overdahl
- Nicholas School of the Environment, Duke University, Durham, NC, 27708, United States
| | - Robert M Tighe
- Division of Pulmonary, Allergy, and Critical Care Medicine, Duke School of Medicine, Duke University, Durham, NC, 27708, United States
| | - Heather M Stapleton
- Nicholas School of the Environment, Duke University, Durham, NC, 27708, United States
| | - P Lee Ferguson
- Nicholas School of the Environment, Duke University, Durham, NC, 27708, United States; Department of Civil and Environmental Engineering, Duke University, Durham, NC, 27708, United States.
| |
Collapse
|
5
|
Tanabe I, Yoshida K, Ishikawa S, Ishimori K, Hashizume T, Yoshimoto T, Ashikaga T. Development of an In Vitro Sensitisation Test Using a Coculture System of Human Bronchial Epithelium and Immune Cells. Altern Lab Anim 2023; 51:387-400. [PMID: 37796587 DOI: 10.1177/02611929231204823] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Chemical respiratory sensitisation is a serious health problem. However, to date, there are no validated test methods available for identifying respiratory sensitisers. The aim of this study was to develop an in vitro sensitisation test by modifying the human cell line activation test (h-CLAT) to detect respiratory sensitisers and distinguish them from skin sensitisers. THP-1 cells were exposed to the test chemicals (two skin sensitisers and six respiratory sensitisers), either as monocultures or as cocultures with air-liquid interface-cultured reconstructed human bronchial epithelium. The responses were analysed by measuring the expression levels of surface markers on THP-1 cells (CD86, CD54 and OX40L) and the concentrations of cytokines in the culture media (interleukin (IL)-8, IL-33 and thymic stromal lymphopoietin (TSLP)). The cocultures exhibited increased CD54 expression on THP-1 cells; moreover, in the cocultures but not in the monocultures, exposure to two uronium salts (i.e. respiratory sensitisers) increased CD54 expression on THP-1 cells to levels above the criteria for a positive h-CLAT result. Additionally, exposure to the respiratory sensitiser abietic acid, significantly increased IL-8 concentration in the culture medium, but only in the cocultures. Although further optimisation of the method is needed to distinguish respiratory from skin sensitisers by using these potential markers (OX40L, IL-33 and TSLP), the coculture of THP-1 cells with bronchial epithelial cells offers a potentially useful approach for the detection of respiratory sensitisers.
Collapse
Affiliation(s)
- Ikuya Tanabe
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., Kanagawa, Japan
| | - Kunitaka Yoshida
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., Kanagawa, Japan
| | - Shinkichi Ishikawa
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., Kanagawa, Japan
| | - Kanae Ishimori
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., Kanagawa, Japan
| | - Tsuneo Hashizume
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., Kanagawa, Japan
| | - Takayuki Yoshimoto
- Department of Immunoregulation, Institute of Medical Science, Tokyo Medical University, Tokyo, Japan
| | - Takao Ashikaga
- Division of Risk Assessment, National Institute of Health Sciences Center for Biological Safety and Research, Kanagawa, Japan
| |
Collapse
|
6
|
Meek B, Bridges JW, Fasey A, Sauer UG. Evidential requirements for the regulatory hazard and risk assessment of respiratory sensitisers: methyl methacrylate as an example. Arch Toxicol 2023; 97:931-946. [PMID: 36797432 PMCID: PMC10025211 DOI: 10.1007/s00204-023-03448-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 01/17/2023] [Indexed: 02/18/2023]
Abstract
This review addresses the need for a framework to increase the consistency, objectivity and transparency in the regulatory assessment of respiratory sensitisers and associated uncertainties. Principal issues are considered and illustrated through a case study (with methyl methacrylate). In the absence of test methods validated for regulatory use, formal documentation of the weight-of-evidence for hazard classification both at the level of integration of individual studies within lines of evidence and across a broad range of data streams was agreed to be critical for such a framework. An integrated approach is proposed to include not only occupational studies and clinical evidence for the regulatory assessment of respiratory sensitisers, but also information on structure and physical and chemical factors, predictive approaches such as structure activity analysis and in vitro and in vivo mechanistic and toxicokinetic findings. A weight-of-evidence protocol, incorporating integration of these sources of data based on predefined considerations, would contribute to transparency and consistency in the outcome of the assessment. In those cases where a decision may need to be taken on the basis of occupational findings alone, conclusions should be based on transparent weighting of relevant data on the observed prevalence of occupational asthma in various studies taking into account all relevant information including the range and nature of workplace exposures to the substance of interest, co-exposure to other chemicals and study quality.
Collapse
Affiliation(s)
| | - James W Bridges
- Emeritus Professor, University of Surrey, Guildford, Surrey, UK
| | | | - Ursula G Sauer
- Scientific Consultancy-Animal Welfare, Hallstattfeld 16, 85579, Neubiberg, Germany.
| |
Collapse
|
7
|
Wang X, Li N, Ma M, Han Y, Rao K. Immunotoxicity In Vitro Assays for Environmental Pollutants under Paradigm Shift in Toxicity Tests. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 20:273. [PMID: 36612599 PMCID: PMC9819277 DOI: 10.3390/ijerph20010273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/13/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
With the outbreak of COVID-19, increasingly more attention has been paid to the effects of environmental factors on the immune system of organisms, because environmental pollutants may act in synergy with viruses by affecting the immunity of organisms. The immune system is a developing defense system formed by all metazoans in the course of struggling with various internal and external factors, whose damage may lead to increased susceptibility to pathogens and diseases. Due to a greater vulnerability of the immune system, immunotoxicity has the potential to be the early event of other toxic effects, and should be incorporated into environmental risk assessment. However, compared with other toxicity endpoints, e.g., genotoxicity, endocrine toxicity, or developmental toxicity, there are many challenges for the immunotoxicity test of environmental pollutants; this is due to the lack of detailed mechanisms of action and reliable assay methods. In addition, with the strong appeal for animal-free experiments, there has been a significant shift in the toxicity test paradigm, from traditional animal experiments to high-throughput in vitro assays that rely on cell lines. Therefore, there is an urgent need to build high-though put immunotoxicity test methods to screen massive environmental pollutants. This paper reviews the common methods of immunotoxicity assays, including assays for direct immunotoxicity and skin sensitization. Direct immunotoxicity mainly refers to immunosuppression, for which the assays mostly use mixed immune cells or isolated single cells from animals with obvious problems, such as high cost, complex experimental operation, strong variability and so on. Meanwhile, there have been no stable and standard cell lines targeting immune functions developed for high-throughput tests. Compared with direct immunotoxicity, skin sensitizer screening has developed relatively mature in vitro assay methods based on an adverse outcome pathway (AOP), which points out the way forward for the paradigm shift in toxicity tests. According to the experience of skin sensitizer screening, this paper proposes that we also should seek appropriate nodes and establish more complete AOPs for immunosuppression and other immune-mediated diseases. Then, effective in vitro immunotoxicity assay methods can be developed targeting key events, simultaneously coordinating the studies of the chemical immunotoxicity mechanism, and further promoting the paradigm shift in the immunotoxicity test.
Collapse
Affiliation(s)
- Xinge Wang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Na Li
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China
| | - Mei Ma
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yingnan Han
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China
| | - Kaifeng Rao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China
| |
Collapse
|
8
|
Seo JA, Cho SA, Park CE, Seo DH, Choi M, An S, Kim BH. Pre-validation study of spectrophotometric direct peptide reactivity assay (Spectro-DPRA) as a modified in chemico skin sensitization test method. Toxicol Res 2022; 38:531-544. [PMID: 36277359 PMCID: PMC9532475 DOI: 10.1007/s43188-022-00130-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/24/2022] [Accepted: 03/14/2022] [Indexed: 10/18/2022] Open
Abstract
Skin sensitization is induced when certain chemicals bind to skin proteins. Direct peptide reactivity assay (DPRA) has been adopted by the OECD as an alternative method to evaluate skin sensitization by assessing a substance's reaction to two model peptides. A modified spectrophotometric method, Spectro-DPRA, can evaluate skin sensitization, in a high throughput fashion, to obviate some limitations of DPRA. Pre-validation studies for Spectro-DPRA were conducted to determine transferability and proficiency, within- and between-laboratory reproducibility, and predictive ability based on GLP principles at three laboratories (AP, KTR, and KCL). All laboratories confirmed high (> 90%) concordance for evaluating the sensitivity induced by ten chemical substances. The concordance among the three tests performed by each laboratory was 90% for AP, 100% for KTR, and 100% for KCL. The mean accuracy of the laboratories was 93.3% [compared to the standard operating procedure (SOP)]. The reproducibility among the three laboratories was as high as 86.7%; the accuracy was 86.7% for AP, 100% for KTR, and 86.7% for KCL (compared to the SOP). An additional 54 substances were assessed in 3 separate labs to verify the prediction rate. Based on the result, 29 out of 33 substances were classified as sensitizers, and 19 out of 21 identified as non-sensitizers; the corresponding sensitivity, specificity, and accuracy values were 87.9%, 90.5%, and 88.9%, respectively. These findings indicate that the Spectro-DPRA can address the molecular initiating event with improved predictability and reproducibility, while saving time and cost compared to DPRA or ADRA.
Collapse
Affiliation(s)
- Jung-Ah Seo
- Department of Public Health, Keimyung University, 1095 Dalgubeol-daero, Dalseo-gu, Daegu, 42601 Republic of Korea
| | - Sun-A Cho
- Safety and Microbiology Lab, Amorepacific Corporation R&D Center, Yongin-si, Republic of Korea
| | - Chang Eon Park
- Korea Testing and Research Institute, Hwasun, Republic of Korea
| | - Dong Hyuk Seo
- Korea Conformity Laboratories, Incheon, Republic of Korea
| | - Myungsuk Choi
- Department of Public Health Science, Korea University, Seoul, Republic of Korea
| | - Susun An
- Safety and Microbiology Lab, Amorepacific Corporation R&D Center, Yongin-si, Republic of Korea
| | - Bae-Hwan Kim
- Department of Public Health, Keimyung University, 1095 Dalgubeol-daero, Dalseo-gu, Daegu, 42601 Republic of Korea
| |
Collapse
|
9
|
Noddeland HK, Kemp P, Urquhart AJ, Herchenhan A, Rytved KA, Petersson K, B. Jensen L. Reactive Oxygen Species-Responsive Polymer Nanoparticles to Improve the Treatment of Inflammatory Skin Diseases. ACS OMEGA 2022; 7:25055-25065. [PMID: 35910173 PMCID: PMC9330180 DOI: 10.1021/acsomega.2c01071] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 07/04/2022] [Indexed: 06/15/2023]
Abstract
To improve the quality of life for people living with chronic inflammatory skin diseases, we propose a new treatment strategy by exploring a stimuli-responsive drug delivery system. Formulations designed by exploiting smart materials can be programmed to perform a specific action upon exposure to disease-related stimuli. For instance, increased levels of reactive oxygen species (ROS), especially the accumulation of hydrogen peroxide, can be utilized to differentiate between healthy and inflamed tissues. In this concept-proofing study, the polymer poly(1,4 phenyleneacetone dimethylene thioketal) (PPADT) was investigated for its ROS-responsive properties and potential to treat inflammatory skin diseases. PPADT nanoparticles were formulated by oil-in-water emulsification followed by solvent evaporation and characterized by size, zeta-potential, and release kinetic profiles. Release profiles revealed that the PPADT nanoparticles were sensitive toward elevated levels of ROS in an ROS-stimulus concentration (0.1-10 mM) and time-dependent manner (flare-up mimicked). The safety assessment proved that the PPADT polymer and the monomers generated by oxidation do not show any sign of being cytotoxic to fibroblasts and no mutagenic liabilities were observed. In conclusion, the PPADT polymer demonstrated to be a promising material for stimuli-responsive delivery of hydrophobic small molecules in the treatment of inflammatory skin diseases.
Collapse
Affiliation(s)
- Heidi K. Noddeland
- Explorative
Formulation & Technologies, LEO Pharma
A/S, 2750 Ballerup, Denmark
- Department
of Pharmacy, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Pernille Kemp
- Explorative
Formulation & Technologies, LEO Pharma
A/S, 2750 Ballerup, Denmark
| | - Andrew J. Urquhart
- Department
of Health Technology, Technical University
of Denmark, 2800 Kgs. Lyngby, Denmark
| | | | - Klaus A. Rytved
- In
Vivo Biology & Safety, LEO Pharma A/S, 2750 Ballerup, Denmark
| | - Karsten Petersson
- Explorative
Formulation & Technologies, LEO Pharma
A/S, 2750 Ballerup, Denmark
| | - Louise B. Jensen
- Explorative
Formulation & Technologies, LEO Pharma
A/S, 2750 Ballerup, Denmark
| |
Collapse
|
10
|
Sadekar N, Boisleve F, Dekant W, Fryer AD, Gerberick GF, Griem P, Hickey C, Krutz NL, Lemke O, Mignatelli C, Panettieri R, Pinkerton KE, Renskers KJ, Sterchele P, Switalla S, Wolter M, Api AM. Identifying a reference list of respiratory sensitizers for the evaluation of novel approaches to study respiratory sensitization. Crit Rev Toxicol 2022; 51:792-804. [PMID: 35142253 DOI: 10.1080/10408444.2021.2024142] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The induction of immunological responses that trigger bio-physiological symptoms in the respiratory tract following repeated exposure to a substance, is known as respiratory sensitization. The inducing compound is known as a respiratory sensitizer. While respiratory sensitization by high molecular weight (HMW) materials is recognized and extensively studied, much less information is available regarding low molecular weight (LMW) materials as respiratory sensitizers. Variability of symptoms presented in humans from such exposures, limited availability of (and access to) documented reports, and the absence of standardized and validated test models, hinders the identification of true respiratory sensitizers. This review aims to sort suspected LMW respiratory sensitizers based on available compelling, reasonable, inadequate, or questionable evidence in humans from occupational exposures and use this information to compose a reference list of reported chemical respiratory sensitizers for scientific research purposes. A list of 97 reported respiratory sensitizers was generated from six sources, and 52 LMW organic chemicals were identified, reviewed, and assigned to the four evidence categories. Less than 10 chemicals were confirmed with compelling evidence for induction of respiratory sensitization in humans from occupational exposures. Here, we propose the reference list for developing novel research on respiratory sensitization.
Collapse
Affiliation(s)
- Nikaeta Sadekar
- Research Institute for Fragrance Materials (RIFM), Woodcliff Lake, NJ, USA
| | | | - Wolfgang Dekant
- Institute of Toxicology, University of Wuerzburg, Wuerzburg, Germany
| | - Allison D Fryer
- Division of Pulmonary and Critical Care Medicine, Oregon Health Science University, Portland, OR, USA
| | | | | | | | - Nora L Krutz
- NV Procter & Gamble Services Company SA, Global Product Stewardship, Strombeek-Bever, Belgium
| | | | | | - Reynold Panettieri
- Rutgers Institute for Translational Medicine and Science (RITMS), Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - Kent E Pinkerton
- Center for Health and the Environment and Department of Pediatrics, University of California, Davis, CA, USA
| | | | | | | | | | - Anne Marie Api
- Research Institute for Fragrance Materials (RIFM), Woodcliff Lake, NJ, USA
| |
Collapse
|
11
|
Lee DH, Choi SY, Jung KK, Yang JY, Jeong JY, Oh JH, Kim SH, Lee JH. The Research of Toxicity and Sensitization Potential of PEGylated Silver and Gold Nanomaterials. TOXICS 2021; 9:355. [PMID: 34941789 PMCID: PMC8705520 DOI: 10.3390/toxics9120355] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/06/2021] [Accepted: 12/14/2021] [Indexed: 02/02/2023]
Abstract
Polyethylene glycol (PEG) is a polymer used for surface modification of important substances in the modern pharmaceutical industry and biopharmaceutical fields. Despite the many benefits of PEGylation, there is also the possibility that the application and exposure of the substance may cause adverse effects in the body, such as an immune response. Therefore, we aimed to evaluate the sensitization responses that could be induced through the intercomparison of nanomaterials of the PEG-coated group with the original group. We selected gold/silver nanomaterials (NMs) for original group and PEGylated silver/gold NMs in this study. First, we measured the physicochemical properties of the four NMs, such as size and zeta potential under various conditions. Additionally, we performed the test of the NM's sensitization potential using the KeratinoSens™ assay for in vitro test method and the LLNA: 5-bromo-2-deoxyuridine (BrdU)-FCM for in vivo test method. The results showed that PEGylated-NMs did not lead to skin sensitization according to OECD TG 442 (alternative test for skin sensitization). In addition, gold nanomaterial showed that cytotoxicity of PEGylated-AuNMs was lower than AuNMs. These results suggest the possibility that PEG coating does not induce an immune response in the skin tissue and can lower the cytotoxicity of nanomaterials.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Sung-Hyun Kim
- Division of Toxicological Research, National Institute of Food and Drug Safety Evaluation, Ministry of Food and Drug Safety, Cheongju 28159, Korea; (D.-H.L.); (S.-Y.C.); (K.-K.J.); (J.-Y.Y.); (J.-y.J.); (J.-H.O.)
| | - Jin-Hee Lee
- Division of Toxicological Research, National Institute of Food and Drug Safety Evaluation, Ministry of Food and Drug Safety, Cheongju 28159, Korea; (D.-H.L.); (S.-Y.C.); (K.-K.J.); (J.-Y.Y.); (J.-y.J.); (J.-H.O.)
| |
Collapse
|
12
|
Bassan A, Alves VM, Amberg A, Anger LT, Beilke L, Bender A, Bernal A, Cronin MT, Hsieh JH, Johnson C, Kemper R, Mumtaz M, Neilson L, Pavan M, Pointon A, Pletz J, Ruiz P, Russo DP, Sabnis Y, Sandhu R, Schaefer M, Stavitskaya L, Szabo DT, Valentin JP, Woolley D, Zwickl C, Myatt GJ. In silico approaches in organ toxicity hazard assessment: Current status and future needs for predicting heart, kidney and lung toxicities. COMPUTATIONAL TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2021; 20:100188. [PMID: 35721273 PMCID: PMC9205464 DOI: 10.1016/j.comtox.2021.100188] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The kidneys, heart and lungs are vital organ systems evaluated as part of acute or chronic toxicity assessments. New methodologies are being developed to predict these adverse effects based on in vitro and in silico approaches. This paper reviews the current state of the art in predicting these organ toxicities. It outlines the biological basis, processes and endpoints for kidney toxicity, pulmonary toxicity, respiratory irritation and sensitization as well as functional and structural cardiac toxicities. The review also covers current experimental approaches, including off-target panels from secondary pharmacology batteries. Current in silico approaches for prediction of these effects and mechanisms are described as well as obstacles to the use of in silico methods. Ultimately, a commonly accepted protocol for performing such assessment would be a valuable resource to expand the use of such approaches across different regulatory and industrial applications. However, a number of factors impede their widespread deployment including a lack of a comprehensive mechanistic understanding, limited in vitro testing approaches and limited in vivo databases suitable for modeling, a limited understanding of how to incorporate absorption, distribution, metabolism, and excretion (ADME) considerations into the overall process, a lack of in silico models designed to predict a safe dose and an accepted framework for organizing the key characteristics of these organ toxicants.
Collapse
Affiliation(s)
- Arianna Bassan
- Innovatune srl, Via Giulio Zanon 130/D, 35129 Padova, Italy
| | - Vinicius M. Alves
- The National Institute of Environmental Health Sciences, Division of the National Toxicology Program, Research Triangle Park, NC 27709, United States
| | - Alexander Amberg
- Sanofi, R&D Preclinical Safety Frankfurt, Industriepark Hoechst, D-65926 Frankfurt am Main, Germany
| | - Lennart T. Anger
- Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, United States
| | - Lisa Beilke
- Toxicology Solutions Inc., San Diego, CA, United States
| | - Andreas Bender
- AI and Data Analytics, Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
- Centre for Molecular Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United States
| | | | - Mark T.D. Cronin
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, L3 3AF, UK
| | - Jui-Hua Hsieh
- The National Institute of Environmental Health Sciences, Division of the National Toxicology Program, Research Triangle Park, NC 27709, United States
| | | | - Raymond Kemper
- Nuvalent, One Broadway, 14th floor, Cambridge, MA 02142, United States
| | - Moiz Mumtaz
- Agency for Toxic Substances and Disease Registry, US Department of Health and Human Services, Atlanta, GA, United States
| | - Louise Neilson
- Broughton Nicotine Services, Oak Tree House, West Craven Drive, Earby, Lancashire BB18 6JZ UK
| | - Manuela Pavan
- Innovatune srl, Via Giulio Zanon 130/D, 35129 Padova, Italy
| | - Amy Pointon
- Functional and Mechanistic Safety, Clinical Pharmacology and Safety Sciences, R&D, AstraZeneca, Cambridge, UK
| | - Julia Pletz
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, L3 3AF, UK
| | - Patricia Ruiz
- Agency for Toxic Substances and Disease Registry, US Department of Health and Human Services, Atlanta, GA, United States
| | - Daniel P. Russo
- The Rutgers Center for Computational and Integrative Biology, Camden, NJ 08102, United States
- Department of Chemistry, Rutgers University, Camden, NJ 08102, United States
| | - Yogesh Sabnis
- UCB Biopharma SRL, Chemin du Foriest, B-1420 Braine-l’Alleud, Belgium
| | - Reena Sandhu
- SafeDose Ltd., 20 Dundas Street West, Suite 921, Toronto, Ontario M5G2H1, Canada
| | - Markus Schaefer
- Sanofi, R&D Preclinical Safety Frankfurt, Industriepark Hoechst, D-65926 Frankfurt am Main, Germany
| | - Lidiya Stavitskaya
- US Food and Drug Administration, Center for Drug Evaluation and Research, Silver Spring, MD 20993, USA
| | | | | | - David Woolley
- ForthTox Limited, PO Box 13550, Linlithgow, EH49 7YU, UK
| | - Craig Zwickl
- Transendix LLC, 1407 Moores Manor, Indianapolis, IN 46229, United States
| | - Glenn J. Myatt
- Instem, 1393 Dublin Road, Columbus, OH 43215, United States
| |
Collapse
|
13
|
Frawley RP, Germolec DR, Johnson VJ, Gulledge T, Manheng W, White K, Shockley KR, Harris SF, Hooth M, Ryan K. Evaluation of skin sensitization induced by four ionic liquids. J Appl Toxicol 2021; 42:392-408. [PMID: 34453447 DOI: 10.1002/jat.4224] [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: 04/28/2021] [Revised: 07/13/2021] [Accepted: 07/19/2021] [Indexed: 11/09/2022]
Abstract
Ionic liquids (ILs) are synthetic solvents used as replacements for volatile organic solvents. Human exposure occurs through dermal or oral routes. In rodents, several ILs were reported to induce dermal toxicity, irritation, and sensitization. Due to the potential for occupational exposure, and industrial use as nonvolatile solvents, 1-ethyl-3-methylimidazolium chloride (EMIM, 6.25% to 50% v/v), 1-butyl-3-methylimidazolium chloride (BMIM, 3.12% to 12.5% v/v), 1-butyl-1-methylpyrrolidinium chloride (BMPY, 0.825% to 6.25% v/v), and N-butylpyridinium chloride (NBuPY, 0.825% to 12.5% v/v) were nominated to the National Toxicology Program and evaluated for skin sensitization. The test compound was applied to the ears of female BALB/c mice daily for 3 days in a primary irritancy (IRR)/local lymph node assay (LLNA). Sensitization was assessed in vitro in the direct peptide reactivity assay (DPRA), KeratinoSens™ assay, and human cell line activation test (h-CLAT). In the LLNA, the butylated ILs, BMIM, and BMPY were more potent than NBuPY (butylated) or EMIM (ethylated), which was neither an irritant nor a sensitizer. NBuPY induced skin irritation in vivo at ≥3.12% (p ≤ 0.01), and sensitization in vitro in the KeratinoSens™ assay and h-CLAT, but was negative for sensitization in vivo and in the DPRA. Although SI3 was not achieved, dermal treatment with 12.5% BMIM or 6.25% BMPY increased (p ≤ 0.01) lymph node cell proliferation in the LLNA. In vitro, BMIM was positive for sensitization in the h-CLAT, and BMPY was positive in the h-CLAT and KeratinoSens™ assay; both were negative in the DPRA. Integrated data analyses, weighted toward in vivo data, suggested that BMIM and BMPY may induce weak to mild sensitization.
Collapse
Affiliation(s)
- Rachel P Frawley
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, Durham, North Carolina, USA
| | - Dori R Germolec
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, Durham, North Carolina, USA
| | - Victor J Johnson
- Burleson Research Technologies, Inc., Morrisville, North Carolina, USA
| | - Travis Gulledge
- Burleson Research Technologies, Inc., Morrisville, North Carolina, USA.,StrideBio, Inc., Durham, North Carolina, USA
| | - Wimolnut Manheng
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Kimber White
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Keith R Shockley
- Division of Intramural Research, National Institute of Environmental Health Sciences, Durham, North Carolina, USA
| | | | - Michelle Hooth
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, Durham, North Carolina, USA
| | - Kristen Ryan
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, Durham, North Carolina, USA
| |
Collapse
|
14
|
Krutz NL, Kimber I, Ryan CA, Kern PS, Gerberick GF. Critical Evaluation of Low-Molecular Weight Respiratory Sensitizers and Their Protein Reactivity Potential Toward Lysine Residues. Toxicol Sci 2021; 182:346-354. [PMID: 34003265 DOI: 10.1093/toxsci/kfab055] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Interest in the development of methods to evaluate the respiratory sensitization potential of low-molecular weight chemicals continues, but no method has yet been generally accepted or validated. A lack of chemical reference standards, together with uncertainty regarding relevant immunological mechanisms, has hampered method development. The first key event in the development of either skin or respiratory sensitization is the formation of stable adducts of the chemical with host proteins. This event is measured in the Direct Peptide Reactivity Assay using cysteine- and lysine-containing model peptides. It is hypothesized that protein reactivity and subsequent adduct formation may represent the earliest point of divergence in the pathways leading to either skin or respiratory sensitization. Direct Peptide Reactivity Assay data for 200 chemicals were compiled and grouped into respiratory, skin and nonsensitizers. Chemicals grouping was based on extensive literature research and expert judgment. To evaluate if chemical groups represent different peptide reactivity profiles, peptide reactivity data were clustered and compared with information on protein binding mechanisms and chemical categories available via the Organization for Economic Co-operation and Development. Toolbox. Respiratory sensitizers (n = 15) showed a significant (3-fold) higher lysine reactivity than skin sensitizers (n = 129). However, this difference was driven largely by the high representation of acid anhydrides among the respiratory sensitizers that showed clear lysine selectivity. Collectively, these data suggest that preferential reactivity for either cysteine or lysine is associated primarily with chemical structure, and that lysine preference is not a unifying characteristic of chemical respiratory allergens.
Collapse
Affiliation(s)
- Nora L Krutz
- NV Procter & Gamble Services Company SA, Global Product Stewardship, Strombeek-Bever 1853, Belgium
| | - Ian Kimber
- University of Manchester, Faculty of Biology, Medicine and Health, Manchester M13 9PL, UK
| | - Cindy A Ryan
- The Procter & Gamble Company, Global Product Stewardship, Mason, Ohio 45040, USA
| | - Petra S Kern
- NV Procter & Gamble Services Company SA, Global Product Stewardship, Strombeek-Bever 1853, Belgium
| | | |
Collapse
|
15
|
Thá EL, Canavez ADPM, Schuck DC, Gagosian VSC, Lorencini M, Leme DM. Beyond dermal exposure: The respiratory tract as a target organ in hazard assessments of cosmetic ingredients. Regul Toxicol Pharmacol 2021; 124:104976. [PMID: 34139277 DOI: 10.1016/j.yrtph.2021.104976] [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: 11/04/2020] [Revised: 05/30/2021] [Accepted: 06/11/2021] [Indexed: 10/21/2022]
Abstract
Dermal contact is the main route of exposure for most cosmetics; however, inhalation exposure could be significant for some formulations (e.g., aerosols, powders). Current cosmetic regulations do not require specific tests addressing respiratory irritation and sensitisation, and despite the prohibition of animal testing for cosmetics, no alternative methods have been validated to assess these endpoints to date. Inhalation hazard is mainly determined based on existing human and animal evidence, read-across, and extrapolation of data from different target organs or tissues, such as the skin. However, because of mechanistic differences, effects on the skin cannot predict effects on the respiratory tract, which indicates a substantial need for the development of new approach methodologies addressing respiratory endpoints for inhalable chemicals in general. Cosmetics might present a particularly significant need for risk assessments of inhalation exposure to provide a more accurate toxicological evaluation and ensure consumer safety. This review describes the differences in the mechanisms of irritation and sensitisation between the skin and the respiratory tract, the progress that has already been made, and what still needs to be done to fill the gap in the inhalation risk assessment of cosmetic ingredients.
Collapse
Affiliation(s)
- Emanoela Lundgren Thá
- Graduate Program in Genetics, Department of Genetics - Federal University of Paraná (UFPR), Curitiba, PR, Brazil.
| | | | | | | | - Márcio Lorencini
- Grupo Boticário, Product Safety Management- Q&PP, São José dos Pinhais, PR, Brazil
| | - Daniela Morais Leme
- Department of Genetics - Federal University of Paraná (UFPR), Curitiba, PR, Brazil.
| |
Collapse
|
16
|
Prasse C. Reactivity-directed analysis - a novel approach for the identification of toxic organic electrophiles in drinking water. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2021; 23:48-65. [PMID: 33432313 DOI: 10.1039/d0em00471e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Drinking water consumption results in exposure to complex mixtures of organic chemicals, including natural and anthropogenic chemicals and compounds formed during drinking water treatment such as disinfection by-products. The complexity of drinking water contaminant mixtures has hindered efforts to assess associated health impacts. Existing approaches focus primarily on individual chemicals and/or the evaluation of mixtures, without providing information about the chemicals causing the toxic effect. Thus, there is a need for the development of novel strategies to evaluate chemical mixtures and provide insights into the species responsible for the observed toxic effects. This critical review introduces the application of a novel approach called Reactivity-Directed Analysis (RDA) to assess and identify organic electrophiles, the largest group of known environmental toxicants. In contrast to existing in vivo and in vitro approaches, RDA utilizes in chemico methodologies that investigate the reaction of organic electrophiles with nucleophilic biomolecules, including proteins and DNA. This review summarizes the existing knowledge about the presence of electrophiles in drinking water, with a particular focus on their formation in oxidative treatment systems with ozone, advanced oxidation processes, and UV light, as well as disinfectants such as chlorine, chloramines and chlorine dioxide. This summary is followed by an overview of existing RDA approaches and their application for the assessment of aqueous environmental matrices, with an emphasis on drinking water. RDA can be applied beyond drinking water, however, to evaluate source waters and wastewater for human and environmental health risks. Finally, future research demands for the detection and identification of electrophiles in drinking water via RDA are outlined.
Collapse
Affiliation(s)
- Carsten Prasse
- Department of Environmental Health and Engineering, Whiting School of Engineering and Bloomberg School of Public Health, Johns Hopkins University, 3400 N Charles St, Baltimore, MD-21318, USA.
| |
Collapse
|
17
|
Golden E, Maertens M, Hartung T, Maertens A. Mapping Chemical Respiratory Sensitization: How Useful Are Our Current Computational Tools? Chem Res Toxicol 2020; 34:473-482. [PMID: 33320000 DOI: 10.1021/acs.chemrestox.0c00320] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Chemical respiratory sensitization is an immunological process that manifests clinically mostly as occupational asthma and is responsible for 1 in 6 cases of adult asthma, although this may be an underestimate of the prevalence, as it is under-diagnosed. Occupational asthma results in unemployment for roughly one-third of those affected due to severe health issues. Despite its high prevalence, chemical respiratory sensitization is difficult to predict, as there are currently no validated models and the mechanisms are not entirely understood, creating a significant challenge for regulatory bodies and industry alike. The Adverse Outcome Pathway (AOP) for respiratory sensitization is currently incomplete. However, some key events have been identified, and there is overlap with the comparatively well-characterized AOP for dermal sensitization. Because of this, and the fact that dermal sensitization is often assessed by in vivo, in chemico, or in silico methods, regulatory bodies are defaulting to the dermal sensitization status of chemicals as a proxy for respiratory sensitization status when evaluating chemical safety. We identified a data set of known human respiratory sensitizers, which we used to investigate the accuracy of a structural alert model, Toxtree, designed for skin sensitization and the Centre for Occupational and Environmental Health (COEH)'s model, a model developed specifically for occupational asthma. While both models had a reasonable level of accuracy, the COEH model achieved the highest balanced accuracy at 76%; when the models agreed, the overall accuracy was 87%. There were important differences between the models: Toxtree had superior performance for some structural alerts and some categories of well-characterized skin sensitizers, while the COEH model had high accuracy in identifying sensitizers that lacked identified skin sensitization reactivity domains. Overall, both models achieved respectable accuracy. However, neither model addresses potency, which, along with data quality, remains a hurdle, and the field must prioritize these issues to move forward.
Collapse
Affiliation(s)
- Emily Golden
- Center for Alternatives to Animal Testing (CAAT), Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205, United States
| | - Mikhail Maertens
- Center for Alternatives to Animal Testing (CAAT), Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205, United States
| | - Thomas Hartung
- Center for Alternatives to Animal Testing (CAAT), Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205, United States.,CAAT-Europe, University of Konstanz, 78464 Konstanz, Germany
| | - Alexandra Maertens
- Center for Alternatives to Animal Testing (CAAT), Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205, United States
| |
Collapse
|
18
|
Kawakami T, Isama K, Ikarashi Y, Jinno H. Evaluation of the sensitization potential of volatile and semi-volatile organic compounds using the direct peptide reactivity assay. J Toxicol Sci 2020; 45:725-735. [PMID: 33132246 DOI: 10.2131/jts.45.725] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The purpose of this study was to evaluate the sensitization potential of 82 compounds classified as volatile and/or semi-volatile organic compounds using the direct peptide reactivity assay (DPRA), given that these chemical compounds have been detected frequently and at high concentrations in a national survey of Japanese indoor air pollution and other studies. The skin sensitization potential of 81 of these compounds was evaluable in our study; one compound co-eluted with cysteine peptide and was therefore not evaluable. Twenty-five of the evaluated compounds were classified as positive. Although all glycols and plasticizers detected frequently and at high concentrations in a national survey of Japanese indoor air pollution were negative, hexanal and nonanal, which are found in fragrances and building materials, tested positive. Monoethanolamine and 1,3-butanediol, which cause clinical contact dermatitis, and several compounds reported to have weak sensitization potential in animal studies, were classified as negative. Thus, it was considered that compounds with weak sensitization potential were evaluated as negative in the DPRA. Although the sensitization potential of the formaldehyde-releasing preservative bronopol has been attributed to the release of formaldehyde (a well-known contact allergen) by its degradation, its degradation products-bromonitromethane and 2-bromoethanol-were classified as positive, indicating that these degradation products also exhibit sensitization potential. The compounds that tested positive in this study should be comprehensively assessed through multiple toxicity and epidemiological studies.
Collapse
Affiliation(s)
- Tsuyoshi Kawakami
- Division of Environmental Chemistry, National Institute of Health Sciences
| | - Kazuo Isama
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University
| | - Yoshiaki Ikarashi
- Division of Environmental Chemistry, National Institute of Health Sciences
| | - Hideto Jinno
- Faculty of Pharmaceutical Sciences, Meijo University
| |
Collapse
|
19
|
Bezerra SF, Dos Santos Rodrigues B, da Silva ACG, de Ávila RI, Brito HRG, Cintra ER, Veloso DFMC, Lima EM, Valadares MC. Application of the adverse outcome pathway framework for investigating skin sensitization potential of nanomaterials using new approach methods. Contact Dermatitis 2020; 84:67-74. [PMID: 32683706 DOI: 10.1111/cod.13669] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 07/08/2020] [Accepted: 07/16/2020] [Indexed: 12/28/2022]
Abstract
BACKGROUND Currently, considerable efforts to standardize methods for accurate assessment of properties and safety aspects of nanomaterials are being made. However, immunomodulation effects upon skin exposure to nanomaterial have not been explored. OBJECTIVES To investigate the immunotoxicity of single-wall carbon nanotubes, titanium dioxide, and fullerene using the current mechanistic understanding of skin sensitization by applying the concept of adverse outcome pathway (AOP). METHODS Investigation of the ability of nanomaterials to interact with skin proteins using the micro-direct peptide reactivity assay; the expression of CD86 cell surface marker using the U937 cell activation test (OECD No. 442E/2018); and the effects of nanomaterials on modulating inflammatory response through inflammatory cytokine release by U937 cells. RESULTS The nanomaterials easily internalized into keratinocytes cells, interacted with skin proteins, and triggered activation of U937 cells by increasing CD86 expression and modulating inflammatory cytokine production. Consequently, these nanomaterials were classified as skin sensitizers in vitro. CONCLUSIONS Our study suggests the potential immunotoxicity of nanomaterials and highlights the importance of studying the immunotoxicity and skin sensitization potential of nanomaterials to anticipate possible human health risks using standardized mechanistic nonanimal methods with high predictive accuracy. Therefore, it contributes toward the applicability of existing OECD (Organisation for Economic Co-operation and Development) testing guidelines for accurate assessment of nanomaterial skin sensitization potential.
Collapse
Affiliation(s)
- Soraia F Bezerra
- Laboratory of Education and Research in in vitro Toxicology (Tox In), Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Bruna Dos Santos Rodrigues
- Laboratory of Education and Research in in vitro Toxicology (Tox In), Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Artur C G da Silva
- Laboratory of Education and Research in in vitro Toxicology (Tox In), Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Renato I de Ávila
- Laboratory of Education and Research in in vitro Toxicology (Tox In), Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Hallison R G Brito
- Laboratory of Education and Research in in vitro Toxicology (Tox In), Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Emílio R Cintra
- Laboratory of Pharmaceutical Technology-Farmatec, Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Danillo F M C Veloso
- Laboratory of Pharmaceutical Technology-Farmatec, Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Eliana M Lima
- Laboratory of Pharmaceutical Technology-Farmatec, Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Marize C Valadares
- Laboratory of Education and Research in in vitro Toxicology (Tox In), Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| |
Collapse
|
20
|
Melnikov F, Geohagen BC, Gavin T, LoPachin RM, Anastas PT, Coish P, Herr DW. Application of the hard and soft, acids and bases (HSAB) theory as a method to predict cumulative neurotoxicity. Neurotoxicology 2020; 79:95-103. [PMID: 32380191 DOI: 10.1016/j.neuro.2020.04.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 04/07/2020] [Accepted: 04/22/2020] [Indexed: 12/14/2022]
Abstract
Xenobiotic electrophiles can form covalent adducts that may impair protein function, damage DNA, and may lead a range of adverse effects. Cumulative neurotoxicity is one adverse effect that has been linked to covalent protein binding as a Molecular Initiating Event (MIE). This paper describes a mechanistic in silico chemical screening approach for neurotoxicity based on Hard and Soft Acids and Bases (HSAB) theory. We evaluated the applicability of HSAB-based electrophilicity screening protocol for neurotoxicity on 19 positive and 19 negative reference chemicals. These reference chemicals were identified from the literature, using available information on mechanisms of neurotoxicity whenever possible. In silico screening was based on structural alerts for protein binding motifs and electrophilicity index in the range of known neurotoxicants. The approach demonstrated both a high positive prediction rate (82-90 %) and specificity (90 %). The overall sensitivity was relatively lower (47 %). However, when predicting the toxicity of chemicals known or suspected of acting via non-specific adduct formation mechanism, the HSAB approach identified 7/8 (sensitivity 88 %) of positive control chemicals correctly. Consequently, the HSAB-based screening is a promising approach of identifying possible neurotoxins with adduct formation molecular initiating events. While the approach must be expanded over time to capture a wider range of MIEs involved in neurotoxicity, the mechanistic nature of the screen allows users to flag chemicals for possible adduct formation MIEs. Thus, the HSAB based toxicity screening is a promising strategy for toxicity assessment and chemical prioritization in neurotoxicology and other health endpoints that involve adduct formation.
Collapse
Affiliation(s)
- Fjodor Melnikov
- School of Forestry and Environmental Studies, Yale University, New Haven, CT, 06511, United States.
| | - Brian C Geohagen
- Department of Anesthesiology, Montefiore Medical Center, Albert Einstein College of Medicine, 111 E. 210th St, Bronx, NY, 10467, United States.
| | - Terrence Gavin
- Department of Chemistry, Iona College, 402 North Avenue, New Rochelle, NY, 10804, United States.
| | - Richard M LoPachin
- Department of Anesthesiology, Montefiore Medical Center, Albert Einstein College of Medicine, 111 E. 210th St, Bronx, NY, 10467, United States.
| | - Paul T Anastas
- School of Forestry and Environmental Science, School of Public Health, Yale University, New Haven, CT 06511, United States.
| | - Phillip Coish
- School of Forestry and Environmental Science, Yale University, New Haven, CT 06511, United States.
| | - David W Herr
- Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Research Triangle Park, NC, 27711, United States.
| |
Collapse
|
21
|
Cui X, Yang R, Li S, Liu J, Wu Q, Li X. Modeling and insights into molecular basis of low molecular weight respiratory sensitizers. Mol Divers 2020; 25:847-859. [PMID: 32166484 DOI: 10.1007/s11030-020-10069-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 03/03/2020] [Indexed: 01/10/2023]
Abstract
Respiratory sensitization has been considered an important toxicological endpoint, because of the severe risk to human health. A great part of sensitization events were caused by low molecular weight (< 1000) respiratory sensitizers in the past decades. However, there is currently no widely accepted test method that can identify prospective low molecular weight respiratory sensitisers. Herein, we performed the study of modeling and insights into molecular basis of low molecular weight respiratory sensitizers with a high-quality data set containing 136 respiratory sensitizers and 518 nonsensitizers. We built a number of classification models by using OCHEM tools, and a consensus model was developed based on the ten best individual models. The consensus model showed good predictive ability with a balanced accuracy of 0.78 and 0.85 on fivefold cross-validation and external validation, respectively. The readers can predict the respiratory sensitization of organic compounds via https://ochem.eu/article/114857 . The effect of several molecular properties on respiratory sensitization was also evaluated. The results indicated that these properties differ significantly between respiratory sensitizers and nonsensitizers. Furthermore, 14 privileged substructures responsible for respiratory sensitization were identified. We hope the models and the findings could provide useful help for environmental risk assessment.
Collapse
Affiliation(s)
- Xueyan Cui
- Department of Clinical pharmacy, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, 250014, China
| | - Rui Yang
- Department of Clinical pharmacy, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, 250014, China
| | - Siwen Li
- Department of Clinical pharmacy, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, 250014, China
| | - Juan Liu
- Department of Clinical pharmacy, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, 250014, China
| | - Qiuyun Wu
- Department of Clinical pharmacy, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, 250014, China
| | - Xiao Li
- Department of Clinical pharmacy, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, 250014, China. .,Department of Clinical pharmacy, The First Affiliated Hospital of Shandong First Medical University, Shandong First Medical University, Jinan, 250014, China.
| |
Collapse
|
22
|
Arts J. How to assess respiratory sensitization of low molecular weight chemicals? Int J Hyg Environ Health 2020; 225:113469. [PMID: 32058937 DOI: 10.1016/j.ijheh.2020.113469] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/29/2019] [Accepted: 01/27/2020] [Indexed: 12/13/2022]
Abstract
There are no validated and regulatory accepted (animal) models to test for respiratory sensitization of low molecular weight (LMW) chemicals. Since several decades such chemicals are classified as respiratory sensitizers almost exclusively based on observations in workers. However, both respiratory allergens (in which process the immune system is involved) as well as asthmagens (no involvement of the immune system) may induce the same type of respiratory symptoms. Correct classification is very important from a health's perspective point of view. On the other hand, over-classification is not preferable in view of high costs to overdue workplace engineering controls or the chemical ultimately being banned due to Authorities' decisions. It would therefore be very beneficial if respiratory sensitizers can be correctly identified and distinguished from skin sensitizers and non-sensitizers/respiratory irritants. The purpose of this paper is to consider whether LMW chemicals can be correctly identified based on the currently available screening methods in workers, and/or via in silico, in vitro and/or in vivo testing. Collectively, based on the available information further effort is still needed to be able to correctly identify respiratory sensitizers and to distinguish these from skin sensitizers and irritants, not at least because of the far-reaching consequences once a chemical is classified as a respiratory sensitizer.
Collapse
Affiliation(s)
- Josje Arts
- Nouryon, Velperweg 76, 6824 BM Arnhem, the Netherlands.
| |
Collapse
|
23
|
Hemming JDC, Hosford M, Shafer MM. Application of the direct peptide reactivity assay (DPRA) to inorganic compounds: a case study of platinum species. Toxicol Res (Camb) 2019; 8:802-814. [PMID: 32153767 DOI: 10.1039/c9tx00242a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 11/04/2019] [Indexed: 12/15/2022] Open
Abstract
The in chemico Direct Peptide Reactivity Assay (DPRA) was developed as a non-animal, relatively high throughput, screening tool for skin sensitization potential. Although the Adverse Outcome Pathway (AOP) for respiratory sensitization remains to be fully elucidated, it is recognized that the molecular initiation event for both skin and respiratory sensitization to low molecular weight chemicals involves haptenation with proteins. The DPRA examines the reactivity of a test compound to two model peptides (containing either cysteine or lysine) and consequently is able to screen for both skin and respiratory sensitization potential. The DPRA was primarily developed for and validated with organic compounds and assessment of the applicability of the assay to metal compounds has received only limited attention. This paper reports the successful application of the DPRA to a series of platinum compounds, including hexachloroplatinate and tetrachloroplatinate salts, which are some of the most potent chemical respiratory sensitizers known. Eleven platinum compounds were evaluated using the DPRA protocol as detailed by Lalko et al., with only minor modification. Two palladium compounds with structures similar to that of the platinum species studied and cobalt chloride were additionally tested for comparison. The hexachloroplatinate and tetrachloroplatinate salts showed exceptionally high reactivity with the cysteine peptide (EC15 values of 1.4 and 14 μM, respectively). However, for platinum compounds (e.g. hydrogen hexahydroxyplatinate and tetraammineplatinum) where clinical and epidemiological evidence indicates limited sensitization potential, the cysteine DPRA showed only minor or no reactivity (EC15 values of 24 600 and >30 000 μM, respectively). The outcomes of the lysine peptide assays were less robust and where EC15 was measurable, values were substantially higher than the corresponding results from the cysteine assay. This work supports the value of in chemico peptide reactivity as a metric for assessment of platinum sensitization potential and therefore in screening of new platinum compounds for low or absent sensitization potential. Additional studies are required to determine whether the DPRA may be successfully applied to other metals. We provide details on method modifications and precautions important to the success of the DPRA in the assessment of metal reactivity.
Collapse
Affiliation(s)
- Jocelyn D C Hemming
- Wisconsin State Laboratory of Hygiene , School of Medicine & Public Health , University of Wisconsin-Madison , 2601 Agricultural Drive , Madison , WI 53718 , USA .
| | - Mark Hosford
- International Platinum Group Metals Association , Schiess-Staett-Strasse 30 , 80339 Munich , Germany
| | - Martin M Shafer
- Wisconsin State Laboratory of Hygiene , School of Medicine & Public Health , University of Wisconsin-Madison , 2601 Agricultural Drive , Madison , WI 53718 , USA . .,Environmental Chemistry and Technology Program , University of Wisconsin-Madison , 660 N. Park St. , Madison , WI 53706 , USA
| |
Collapse
|
24
|
de Ávila RI, Veloso DFMC, Teixeira GC, Rodrigues TL, Lindberg T, Lindstedt M, Fonseca SG, Lima EM, Valadares MC. Evaluation ofin vitrotesting strategies for hazard assessment of the skin sensitization potential of “real‐life” mixtures: The case of henna‐based hair‐colouring products containingp‐phenylenediamine. Contact Dermatitis 2019; 81:194-209. [DOI: 10.1111/cod.13294] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 04/11/2019] [Accepted: 04/17/2019] [Indexed: 02/06/2023]
Affiliation(s)
- Renato Ivan de Ávila
- Laboratory of Education and Research in In Vitro Toxicology—Tox In, Faculty of PharmacyUniversidade Federal de Goiás Goiânia Brazil
| | - Danillo F. M. C. Veloso
- Laboratory of Pharmaceutical Technology—FarmaTec, Faculty of PharmacyUniversidade Federal de Goiás Goiânia Brazil
| | - Gabriel C. Teixeira
- Laboratory of Education and Research in In Vitro Toxicology—Tox In, Faculty of PharmacyUniversidade Federal de Goiás Goiânia Brazil
| | - Thaisângela L. Rodrigues
- Laboratory of Education and Research in In Vitro Toxicology—Tox In, Faculty of PharmacyUniversidade Federal de Goiás Goiânia Brazil
| | - Tim Lindberg
- Department of Immunotechnology, Medicon VillageLund University Lund Sweden
| | - Malin Lindstedt
- Department of Immunotechnology, Medicon VillageLund University Lund Sweden
| | - Simone G. Fonseca
- Institute of Tropical Pathology and Public HealthUniversidade Federal de Goiás Goiânia Brazil
| | - Eliana M. Lima
- Laboratory of Pharmaceutical Technology—FarmaTec, Faculty of PharmacyUniversidade Federal de Goiás Goiânia Brazil
| | - Marize C. Valadares
- Laboratory of Education and Research in In Vitro Toxicology—Tox In, Faculty of PharmacyUniversidade Federal de Goiás Goiânia Brazil
| |
Collapse
|
25
|
Zhang H, Ma JX, Liu CT, Ren JX, Ding L. Development and evaluation of in silico prediction model for drug-induced respiratory toxicity by using naïve Bayes classifier method. Food Chem Toxicol 2018; 121:593-603. [DOI: 10.1016/j.fct.2018.09.051] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 09/19/2018] [Accepted: 09/21/2018] [Indexed: 11/28/2022]
|
26
|
A highly sensitive and selective high pressure liquid chromatography with tandem mass spectrometry (HPLC/MS-MS) method for the direct peptide reactivity assay (DPRA). J Pharmacol Toxicol Methods 2018; 94:1-15. [PMID: 30099091 DOI: 10.1016/j.vascn.2018.07.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 07/16/2018] [Accepted: 07/26/2018] [Indexed: 12/12/2022]
Abstract
While the HPLC/UV (high performance liquid chromatography coupled with ultra-violet spectrometry)-based DPRA (Direct Peptide Reactivity Assay) identifies dermal sensitizers with approximately 80% accuracy, the low selectivity and sensitivity of the HPLC/UV-based DPRA poses challenges to accurately identify the sensitization potential of certain chemicals. In this study, a high performance liquid chromatography coupled with tandem mass spectrometry (HPLC/MS-MS)-based DPRA was developed and validated according to the test guideline (OECD TG 442C). The final results were compared with the results from the traditional HPLC/UV-based guideline DPRA. This HPLC/MS-MS-based DPRA demonstrated similar performance compared to HPLC/UV-based DPRA using known dermal sensitizers and non-sensitizers according to the test guideline (OECD TG 442C). Following the validation, a challenge set of chemicals with either overlapping retention time with peptides, or higher hydrophobicity or chemicals potentially forming non-covalent interactions with peptides were assessed for dermal sensitization potential using both methods and the results were compared to existing in vivo data. The HPLC/MS-MS-based DPRA correctly predicted these chemicals as sensitizers or non-sensitizers; however, the HPLC/UV-based DPRA resulted in false-positive predictions for hydrophobic substances, chemicals with UV peaks overlapping with those of the peptide(s), and compounds that non-covalently interact with the peptides. These findings demonstrate the broader applicability and better sensitivity and selectivity of the LC/MS-MS-based DPRA over the traditional HPLC/UV-based guideline DPRA.
Collapse
|
27
|
Kimber I, Poole A, Basketter DA. Skin and respiratory chemical allergy: confluence and divergence in a hybrid adverse outcome pathway. Toxicol Res (Camb) 2018; 7:586-605. [PMID: 30090609 PMCID: PMC6060610 DOI: 10.1039/c7tx00272f] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 01/18/2018] [Indexed: 12/14/2022] Open
Abstract
Sensitisation of the respiratory tract to chemicals resulting in respiratory allergy and allergic asthma is an important occupational health problem, and presents toxicologists with no shortage of challenges. A major issue is that there are no validated or, even widely recognised, methods available for the identification and characterisation of chemical respiratory allergens, or for distinguishing respiratory allergens from contact allergens. The first objective here has been review what is known (and what is not known) of the mechanisms through which chemicals induce sensitisation of the respiratory tract, and to use this information to construct a hybrid Adverse Outcome Pathway (AOP) that combines consideration of both skin and respiratory sensitisation. The intention then has been to use the construction of this hybrid AOP to identify areas of commonality/confluence, and areas of departure/divergence, between skin sensitisation and sensitisation of the respiratory tract. The hybrid AOP not only provides a mechanistic understanding of how the processes of skin and respiratory sensitisation differ, buy also a means of identifying areas of uncertainty about chemical respiratory allergy that benefit from a further investment in research.
Collapse
Affiliation(s)
- Ian Kimber
- Faculty of Biology , Medicine and Health , University of Manchester , Oxford Road , Manchester M13 9PT , UK . ; Tel: +44 (0) 161 275 1587
| | - Alan Poole
- European Centre for Ecotoxicology and Toxicology of Chemicals (ECETOC) , 2 Av E Van Nieuwenhuyse , 1160 Brussels , Belgium
| | | |
Collapse
|
28
|
Wilson D, Wijeyesakere SJ, Parks AK, Auernhammer TR, Krieger S, Hotchkiss JA, Marty MS. Profiling Acute Oral and Inhalation Toxicity Data Using a Computational Workflow to Screen for Facile Chemical Reactivity. ACTA ACUST UNITED AC 2018. [DOI: 10.1089/aivt.2017.0041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Dan Wilson
- The Dow Chemical Company, Midland, Michigan
| | | | | | | | | | | | | |
Collapse
|
29
|
Sayes CM, Singal M. Optimizing a Test Bed System to Assess Human Respiratory Safety After Exposure to Chemical and Particle Aerosolization. ACTA ACUST UNITED AC 2018. [DOI: 10.1089/aivt.2017.0043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | - Madhuri Singal
- Safety, Quality, Regulatory, and Compliance, Reckitt Benckiser, LLC, Montvale, New Jersey
| |
Collapse
|
30
|
Wijeyesakere SJ, Wilson DM, Settivari R, Auernhammer TR, Parks AK, Marty MS. Development of a Profiler for Facile Chemical Reactivity Using the Open-Source Konstanz Information Miner. ACTA ACUST UNITED AC 2018. [DOI: 10.1089/aivt.2017.0040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
31
|
Ferreira I, Silva A, Martins JD, Neves BM, Cruz MT. Nature and kinetics of redox imbalance triggered by respiratory and skin chemical sensitizers on the human monocytic cell line THP-1. Redox Biol 2018; 16:75-86. [PMID: 29477863 PMCID: PMC5842329 DOI: 10.1016/j.redox.2018.02.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 01/30/2018] [Accepted: 02/04/2018] [Indexed: 11/16/2022] Open
Abstract
Low molecular weight reactive chemicals causing skin and respiratory allergies are known to activate dendritic cells (DC), an event considered to be a key step in both pathologies. Although generation of reactive oxygen species (ROS) is considered a major danger signal responsible for DC maturation, the mechanisms leading to cellular redox imbalance remain poorly understood. Therefore, the aim of this study was to unveil the origin and kinetics of redox imbalance elicited by 1-fluoro-2,4-dinitrobenzene (DNFB) and trimellitic anhydride chloride (TMAC), two golden standards of skin and chemical respiratory allergy, respectively. To track this goal, we addressed the time course modifications of ROS production and cellular antioxidant defenses as well as the modulation of MAPKs signaling pathways and transcription of pathophysiological relevant genes in THP-1 cells. Our data shows that the thiol-reactive sensitizer DNFB directly reacts with cytoplasmic glutathione (GSH) causing its rapid and marked depletion which results in a general increase in ROS accumulation. In turn, TMAC, which preferentially reacts with amine groups, induces a delayed GSH depletion as a consequence of increased mitochondrial ROS production. These divergences in ROS production seem to be correlated with the different extension of intracellular signaling pathways activation and, by consequence, with distinct transcription kinetics of genes such as HMOX1, IL8, IL1B and CD86. Ultimately, our observations may help explain the distinct DC phenotype and T-cell polarizing profile triggered by skin and respiratory sensitizers. Distinctive ROS origin and kinetics elicited by skin and respiratory sensitizers. ROS production elicited by DNFB results primarily from direct GSH haptenation. Distinct expression of genes involved in DC maturation and T-cell polarizing capacity.
Collapse
Affiliation(s)
- Isabel Ferreira
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal; Faculty of Pharmacy, University of Coimbra, 3000- 548 Coimbra, Portugal.
| | - Ana Silva
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal; Faculty of Pharmacy, University of Coimbra, 3000- 548 Coimbra, Portugal
| | - João Demétrio Martins
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal; Faculty of Pharmacy, University of Coimbra, 3000- 548 Coimbra, Portugal
| | - Bruno Miguel Neves
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal; Faculty of Pharmacy, University of Coimbra, 3000- 548 Coimbra, Portugal; Department of Medical Sciences and Institute of Biomedicine - iBiMED, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Maria Teresa Cruz
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal; Faculty of Pharmacy, University of Coimbra, 3000- 548 Coimbra, Portugal.
| |
Collapse
|
32
|
de Ávila RI, Teixeira GC, Veloso DFMC, Moreira LC, Lima EM, Valadares MC. In vitro assessment of skin sensitization, photosensitization and phototoxicity potential of commercial glyphosate-containing formulations. Toxicol In Vitro 2017; 45:386-392. [PMID: 28389279 DOI: 10.1016/j.tiv.2017.04.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 03/29/2017] [Accepted: 04/03/2017] [Indexed: 01/17/2023]
Abstract
This study evaluated the applicability of a modified Direct Peptide Reactivity Assay (DPRA) (OECD N° 442C, 2015) through the 10-fold reduction of reaction volume (micro-DPRA, mDPRA) for skin sensitization evaluation of six commercial glyphosate-containing formulations. In addition, another modification of DPRA was proposed by adding a UVA (5J/cm2) irradiation step, namely photo-mDPRA, to better characterize (photo)sensitizer materials. The phototoxicity profile of pesticides was also evaluated using the 3T3 Neutral Red Uptake Phototoxicity Test (3T3-NRU-PT) (OECD N° 432, 2004). The mDPRA could represent an environmentally acceptable test approach, since it reduces costs and organic waste. Peptide depletion was greater in photo-mDPRA and changed the reactivity class of each test material, in comparison to mDPRA. Thus, the association of mDPRA with photo-mDPRA was better for correctly characterizing human (photo)sensitizer substances and pesticides. In general, cysteine depletion was greater than that of lysine for all materials tested in both mDPRA and photo-mDPRA. Furthermore, while 3T3-NRU-PT is unable to predict (photo)sensitizers, it was capable of correctly identifying the phototoxic potential of the tested agrochemical formulations. In conclusion, mDPRA plus photo-mDPRA and 3T3-NRU-PT seem to be preliminary non-animal test batteries for skin (photo)sensitization/phototoxicity assessment of chemicals, agrochemical formulations and their ingredients.
Collapse
Affiliation(s)
- Renato Ivan de Ávila
- Laboratory of Celullar Toxicology and Pharmacology - FarmaTec, Faculty of Pharmacy, Federal University of Goiás, Goiânia, GO, Brazil
| | - Gabriel Campos Teixeira
- Laboratory of Celullar Toxicology and Pharmacology - FarmaTec, Faculty of Pharmacy, Federal University of Goiás, Goiânia, GO, Brazil
| | | | - Larissa Cleres Moreira
- Laboratory of Celullar Toxicology and Pharmacology - FarmaTec, Faculty of Pharmacy, Federal University of Goiás, Goiânia, GO, Brazil
| | - Eliana Martins Lima
- Laboratory of Pharmaceutical Technology - FarmaTec, Faculty of Pharmacy, Federal University of Goiás, Goiânia, GO, Brazil
| | - Marize Campos Valadares
- Laboratory of Celullar Toxicology and Pharmacology - FarmaTec, Faculty of Pharmacy, Federal University of Goiás, Goiânia, GO, Brazil.
| |
Collapse
|
33
|
Moreira LC, de Ávila RI, Veloso DFMC, Pedrosa TN, Lima ES, do Couto RO, Lima EM, Batista AC, de Paula JR, Valadares MC. In vitro safety and efficacy evaluations of a complex botanical mixture of Eugenia dysenterica DC. (Myrtaceae): Prospects for developing a new dermocosmetic product. Toxicol In Vitro 2017; 45:397-408. [DOI: 10.1016/j.tiv.2017.04.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Revised: 03/03/2017] [Accepted: 04/03/2017] [Indexed: 12/31/2022]
|
34
|
Respiratory sensitization: toxicological point of view on the available assays. Arch Toxicol 2017; 92:803-822. [DOI: 10.1007/s00204-017-2088-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 10/05/2017] [Indexed: 12/22/2022]
|
35
|
Sullivan KM, Enoch SJ, Ezendam J, Sewald K, Roggen EL, Cochrane S. An Adverse Outcome Pathway for Sensitization of the Respiratory Tract by Low-Molecular-Weight Chemicals: Building Evidence to Support the Utility ofIn VitroandIn SilicoMethods in a Regulatory Context. ACTA ACUST UNITED AC 2017. [DOI: 10.1089/aivt.2017.0010] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Kristie M. Sullivan
- Physicians Committee for Responsible Medicine, Washington, District of Columbia
| | - Steven J. Enoch
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, England
| | - Janine Ezendam
- National Institute for Public Health and the Environment (RIVM), Centre for Health Protection, Bilthoven, The Netherlands
| | - Katherina Sewald
- Fraunhofer Institute for Toxicology and Experimental Medicine ITEM, Hannover, Germany
| | - Erwin L. Roggen
- 3Rs Management & Consulting ApS (3RsMC ApS), Lyngby, Denmark
| | | |
Collapse
|
36
|
Narita K, Vo PTH, Yamamoto K, Kojima H, Itagaki H. Preventing false-negatives in the in vitro skin sensitization testing of acid anhydrides using interleukin-8 release assays. Toxicol In Vitro 2017; 42:69-75. [DOI: 10.1016/j.tiv.2017.04.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 03/15/2017] [Accepted: 04/10/2017] [Indexed: 10/19/2022]
|
37
|
Current status of alternative methods for assessing immunotoxicity: A chemical industry perspective. CURRENT OPINION IN TOXICOLOGY 2017. [DOI: 10.1016/j.cotox.2017.06.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
38
|
Behaviour of chemical respiratory allergens in novel predictive methods for skin sensitisation. Regul Toxicol Pharmacol 2017; 86:101-106. [PMID: 28274809 DOI: 10.1016/j.yrtph.2017.03.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 02/07/2017] [Accepted: 03/02/2017] [Indexed: 12/30/2022]
Abstract
Asthma resulting from sensitisation of the respiratory tract to chemicals is an important occupational health issue, presenting many toxicological challenges. Most importantly there are no recognised predictive methods for respiratory allergens. Nevertheless, it has been found that all known chemical respiratory allergens elicit positive responses in assays for skin sensitising chemicals. Thus, chemicals failing to induce a positive response in skin sensitisation assays such as the local lymph node assay (LLNA) lack not only skin sensitising activity, but also the potential to cause respiratory sensitisation. However, it is unclear whether it will be possible to regard chemicals that are negative in in vitro skin sensitisation tests also as lacking respiratory sensitising activity. To address this, the behaviour of chemical respiratory allergens in the LLNA and in recently validated non-animal tests for skin sensitisation have been examined. Most chemical respiratory allergens are positive in one or more newly validated non-animal test methods, although the situation varies between individual assays. The use of an integrated testing strategy could provide a basis for recognition of most respiratory sensitising chemicals. However, a more complete picture of the performance characteristics of such tests is required before specific recommendations can be made.
Collapse
|
39
|
Dik S, Rorije E, Schwillens P, van Loveren H, Ezendam J. Can the Direct Peptide Reactivity Assay Be Used for the Identification of Respiratory Sensitization Potential of Chemicals? Toxicol Sci 2016; 153:361-71. [PMID: 27473337 DOI: 10.1093/toxsci/kfw130] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Prospective identification of low molecular weight respiratory sensitizers is difficult due to the current lack of adequate test methods. The direct peptide reactivity assay (DPRA) seems to be a promising method to determine the sensitization potential of chemicals because it determines the intrinsic characteristic of sensitizers to bind to proteins. It is already applied in the field of skin sensitization, and adaptation to respiratory sensitization has started recently. This article further evaluates the ability of the DPRA to predict the respiratory sensitization potential of chemicals. In addition, the added value of applying High Performance Liquid Chromatography (HPLC)-MS and measurements after 20 minutes and 24 hours of incubation was evaluated. Eighteen respiratory sensitizers (10 haptens, 3 prehaptens, and 5 prohaptens) and 14 nonsensitizers were tested with 2-model peptides. Based on peptide depletion, a prediction model was proposed for the identification of (respiratory) sensitizers. Application of mass spectrometry and measurements at 2 time-points increased prediction accuracy of the assay by resolving discordant results. The prediction model correctly identified all haptens and prehaptens as sensitizers. The 5 prohaptens were not identified as sensitizers, most likely due to lack of metabolic activity in the DPRA. All but 1 nonsensitizer was correctly predicted. The model, therefore, shows an accuracy of 78% for the tested dataset. Unfortunately, this assay cannot be used to distinguish respiratory from skin sensitizers. To make this distinction, the DPRA needs to be combined with other test methods that are able to identify respiratory sensitizers.
Collapse
Affiliation(s)
- Sander Dik
- *Centre for Health Protection Department of Toxicogenomics, Maastricht University, Maastricht 6200 MD, The Netherlands
| | - Emiel Rorije
- Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, Bilthoven 3720 BA, The Netherlands
| | | | - Henk van Loveren
- *Centre for Health Protection Department of Toxicogenomics, Maastricht University, Maastricht 6200 MD, The Netherlands
| | | |
Collapse
|
40
|
Wong CL, Lam AL, Smith MT, Ghassabian S. Evaluation of a High-Throughput Peptide Reactivity Format Assay for Assessment of the Skin Sensitization Potential of Chemicals. Front Pharmacol 2016; 7:53. [PMID: 27014067 PMCID: PMC4789461 DOI: 10.3389/fphar.2016.00053] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 02/26/2016] [Indexed: 11/13/2022] Open
Abstract
The direct peptide reactivity assay (DPRA) is a validated method for in vitro assessment of the skin sensitization potential of chemicals. In the present work, we describe a peptide reactivity assay using 96-well plate format and systematically identified the optimal assay conditions for accurate and reproducible classification of chemicals with known sensitizing capacity. The aim of the research is to ensure that the analytical component of the peptide reactivity assay is robust, accurate, and reproducible in accordance with criteria that are used for the validation of bioanalytical methods. Analytical performance was evaluated using quality control samples (QCs; heptapeptides at low, medium, and high concentrations) and incubation of control chemicals (chemicals with known sensitization capacity, weak, moderate, strong, extreme, and non-sensitizers) with each of three synthetic heptapeptides, viz Cor1-C420 (Ac-NKKCDLF), cysteine- (Ac-RFAACAA), and lysine- (Ac-RFAAKAA) containing heptapeptides. The optimal incubation temperature for all three heptapeptides was 25°C. Apparent heptapeptide depletion was affected by vial material composition. Incubation of test chemicals with Cor1-C420, showed that peptide depletion was unchanged in polypropylene vials over 3-days storage in an autosampler but this was not the case for borosilicate glass vials. For cysteine-containing heptapeptide, the concentration was not stable by day 3 post-incubation in borosilicate glass vials. Although the lysine-containing heptapeptide concentration was unchanged in both polypropylene and borosilicate glass vials, the apparent extent of lysine-containing heptapeptide depletion by ethyl acrylate, differed between polypropylene (24.7%) and glass (47.3%) vials. Additionally, the peptide-chemical complexes for Cor1-C420-cinnamaldehyde and cysteine-containing heptapeptide-2, 4-dinitrochlorobenzene were partially reversible during 3-days of autosampler storage. These observations further highlight the difficulty in adapting in vitro methods to high-throughput format for screening the skin sensitization potential of large numbers of chemicals whilst ensuring that the data produced are both accurate and reproducible.
Collapse
Affiliation(s)
- Chin Lin Wong
- Centre for Integrated Preclinical Drug Development, The University of QueenslandSt Lucia, QLD, Australia; School of Pharmacy, The University of QueenslandWoolloongabba, QLD, Australia
| | - Ai-Leen Lam
- Centre for Integrated Preclinical Drug Development, The University of Queensland St Lucia, QLD, Australia
| | - Maree T Smith
- Centre for Integrated Preclinical Drug Development, The University of QueenslandSt Lucia, QLD, Australia; School of Pharmacy, The University of QueenslandWoolloongabba, QLD, Australia
| | - Sussan Ghassabian
- Centre for Integrated Preclinical Drug Development, The University of Queensland St Lucia, QLD, Australia
| |
Collapse
|
41
|
Singleton H, Popple A, Gellatly N, Maxwell G, Williams J, Friedmann PS, Kimber I, Dearman RJ. Anti-hapten antibodies in response to skin sensitization. Contact Dermatitis 2015; 74:197-204. [PMID: 26560413 DOI: 10.1111/cod.12486] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/07/2015] [Accepted: 09/21/2015] [Indexed: 02/04/2023]
Abstract
Whereas T lymphocyte (T cell) activation is the key event in the acquisition of skin sensitization and subsequent elicitation of allergic contact dermatitis, the humoral component of immune responses to organic contact allergens has received little consideration. There is evidence that, in experimental animals, topical exposure to potent contact allergens is associated with B cell activation and proliferation, and hapten-specific antibody production. However, there is very limited evidence available for anti-hapten antibody responses being induced following topical exposure of humans to contact allergens. Nevertheless, it is important to appreciate that there are almost no negative studies in which evidence for antibody production as the result of skin sensitization has been sought and not found. That is, there is absence of evidence rather than evidence of absence. Furthermore, exposure to chemical respiratory allergens, in which the skin has been implicated as a potential route of sensitization, results in anti-hapten antibody responses. It is proposed that skin sensitization to contact allergens will normally be accompanied by antibody production. The phenomenon is worthy of investigation, as anti-hapten antibodies could potentially influence and/or regulate the induction of skin sensitization. Moreover, such antibodies may provide an informative correlate of the extent to which sensitization has been acquired.
Collapse
Affiliation(s)
- Helen Singleton
- Department of Toxicology, Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT, UK
| | - Amy Popple
- Department of Toxicology, Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT, UK
| | - Nichola Gellatly
- Unilever Safety and Environmental Assurance Centre, Colworth Science Park, Bedford, MK44 1LQ, UK
| | - Gavin Maxwell
- Unilever Safety and Environmental Assurance Centre, Colworth Science Park, Bedford, MK44 1LQ, UK
| | | | - Peter S Friedmann
- Division of Infection, Inflammation & Immunity, University of Southampton, Southampton, SO17 1BJ, UK
| | - Ian Kimber
- Department of Toxicology, Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT, UK
| | - Rebecca J Dearman
- Department of Toxicology, Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT, UK
| |
Collapse
|
42
|
Dik S, Pennings JLA, van Loveren H, Ezendam J. Development of an in vitro test to identify respiratory sensitizers in bronchial epithelial cells using gene expression profiling. Toxicol In Vitro 2015; 30:274-80. [PMID: 26518187 DOI: 10.1016/j.tiv.2015.10.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 10/21/2015] [Accepted: 10/24/2015] [Indexed: 11/29/2022]
Abstract
Chemicals that induce asthma at the workplace are substances of concern. At present, there are no widely accepted methods to identify respiratory sensitizers, and classification of these substances is based on human occupational data. Several studies have contributed to understanding the mechanisms involved in respiratory sensitization, although uncertainties remain. One point of interest for respiratory sensitization is the reaction of the epithelial lung barrier to respiratory sensitizers. To elucidate potential molecular effects of exposure of the epithelial lung barrier, a gene expression profile was created based on a DNA microarray experiment using the bronchial epithelial cell line 16 HBE14o(-). The cells were exposed to 12 respiratory sensitizers and 10 non-sensitizers. For statistical analysis, we used a class prediction approach that combined three machine learning algorithms, leave-one-compound-out cross validation, and majority voting per tested compound. This approach allowed for a prediction accuracy of 95%. Identified predictive genes were mainly associated with the cytoskeleton and barrier function of the epithelial cell. Several of these genes were reported to be associated with asthma as well. Taken together, this indicates that pulmonary barrier function is an important target for respiratory sensitizers and associated genes can be used to predict the respiratory sensitization potential of chemicals.
Collapse
Affiliation(s)
- Sander Dik
- Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands; Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands
| | - Jeroen L A Pennings
- Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
| | - Henk van Loveren
- Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands; Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands
| | - Janine Ezendam
- Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands.
| |
Collapse
|
43
|
Cochrane SA, Arts JHE, Ehnes C, Hindle S, Hollnagel HM, Poole A, Suto H, Kimber I. Thresholds in chemical respiratory sensitisation. Toxicology 2015; 333:179-194. [PMID: 25963507 DOI: 10.1016/j.tox.2015.04.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 04/16/2015] [Accepted: 04/16/2015] [Indexed: 12/26/2022]
Abstract
There is a continuing interest in determining whether it is possible to identify thresholds for chemical allergy. Here allergic sensitisation of the respiratory tract by chemicals is considered in this context. This is an important occupational health problem, being associated with rhinitis and asthma, and in addition provides toxicologists and risk assessors with a number of challenges. In common with all forms of allergic disease chemical respiratory allergy develops in two phases. In the first (induction) phase exposure to a chemical allergen (by an appropriate route of exposure) causes immunological priming and sensitisation of the respiratory tract. The second (elicitation) phase is triggered if a sensitised subject is exposed subsequently to the same chemical allergen via inhalation. A secondary immune response will be provoked in the respiratory tract resulting in inflammation and the signs and symptoms of a respiratory hypersensitivity reaction. In this article attention has focused on the identification of threshold values during the acquisition of sensitisation. Current mechanistic understanding of allergy is such that it can be assumed that the development of sensitisation (and also the elicitation of an allergic reaction) is a threshold phenomenon; there will be levels of exposure below which sensitisation will not be acquired. That is, all immune responses, including allergic sensitisation, have threshold requirement for the availability of antigen/allergen, below which a response will fail to develop. The issue addressed here is whether there are methods available or clinical/epidemiological data that permit the identification of such thresholds. This document reviews briefly relevant human studies of occupational asthma, and experimental models that have been developed (or are being developed) for the identification and characterisation of chemical respiratory allergens. The main conclusion drawn is that although there is evidence that the acquisition of sensitisation to chemical respiratory allergens is a dose-related phenomenon, and that thresholds exist, it is frequently difficult to define accurate numerical values for threshold exposure levels. Nevertheless, based on occupational exposure data it may sometimes be possible to derive levels of exposure in the workplace, which are safe. An additional observation is the lack currently of suitable experimental methods for both routine hazard characterisation and the measurement of thresholds, and that such methods are still some way off. Given the current trajectory of toxicology, and the move towards the use of non-animal in vitro and/or in silico) methods, there is a need to consider the development of alternative approaches for the identification and characterisation of respiratory sensitisation hazards, and for risk assessment.
Collapse
Affiliation(s)
- Stella A Cochrane
- Unilever Safety and Environmental Assurance Centre, Colworth Science Park, Sharnbrook, Bedfordshire, Mk44 1LQ, UK.
| | | | - Colin Ehnes
- BASF SE, GUP/PB - Z470, 67056 Ludwigshafen, Germany
| | - Stuart Hindle
- Dow Europe GmbH, Bachtobelstrasse 3, CH-8810 Horgen, Switzerland
| | - Heli M Hollnagel
- Dow Europe GmbH, Bachtobelstrasse 3, CH-8810 Horgen, Switzerland
| | - Alan Poole
- ECETOC, Avenue Van Nieuwenhuyse 2, Box 8, B-1160 Bruxelles, Belgium
| | - Hidenori Suto
- Sumitomo Chemical Co. Ltd. Environmental Health Science Laboratory, 3-1-98 Kasugade-Naka, Konohana-Ku, Osaka 554-8558, Japan
| | - Ian Kimber
- University of Manchester, Faculty of Life Sciences, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK
| |
Collapse
|
44
|
Wong CL, Ghassabian S, Smith MT, Lam AL. In vitro methods for hazard assessment of industrial chemicals - opportunities and challenges. Front Pharmacol 2015; 6:94. [PMID: 25999858 PMCID: PMC4419653 DOI: 10.3389/fphar.2015.00094] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 04/16/2015] [Indexed: 11/13/2022] Open
Abstract
Allergic contact dermatitis (ACD) is a delayed-type hypersensitivity immune reaction mediated by T-lymphocytes as a result of repeated exposure of an allergen primarily on skin. ACD accounts for up to 95% of occupational skin diseases, with epoxy resins implicated as one of the most common causes of ACD. Efficient high-throughput in vitro screening for accurate identification of compounds and materials that may pose hazardous risks in the workplace is crucial. At present, the murine local lymph node assay is the 'method of choice' for predicting the sensitizing potency of contact allergens. As the 3Rs principles of reduction, refinement, and replacement in animal testing has gained political and economic momentum, several in vitro screening methods have been developed for identifying potential contact allergens. To date, these latter methods have been utilized primarily to assess the skin sensitizing potential of the chemical components of cosmetic products with scant research attention as to the applicability of these methods to industrial chemicals, particularly epoxy resins. Herein we review the currently utilized in vitro methods and identify the knowledge gaps with regard to assessing the generalizability of in vitro screening methods for assessing the skin sensitizing potential of industrial chemicals.
Collapse
Affiliation(s)
- Chin Lin Wong
- Centre for Integrated Preclinical Drug Development, The University of QueenslandSt Lucia, QLD, Australia
- School of Pharmacy, The University of QueenslandWoolloongabba, QLD, Australia
| | - Sussan Ghassabian
- Centre for Integrated Preclinical Drug Development, The University of QueenslandSt Lucia, QLD, Australia
| | - Maree T. Smith
- Centre for Integrated Preclinical Drug Development, The University of QueenslandSt Lucia, QLD, Australia
- School of Pharmacy, The University of QueenslandWoolloongabba, QLD, Australia
| | - Ai-Leen Lam
- Centre for Integrated Preclinical Drug Development, The University of QueenslandSt Lucia, QLD, Australia
| |
Collapse
|
45
|
Methylisothiazolinone: dermal and respiratory immune responses in mice. Toxicol Lett 2015; 235:179-88. [PMID: 25907379 DOI: 10.1016/j.toxlet.2015.04.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 04/16/2015] [Accepted: 04/17/2015] [Indexed: 11/21/2022]
Abstract
Methylisothiazolinone (MI), a widely used chemical preservative in industrial and household products, and cosmetics, has been associated with allergic contact dermatitis. However, the asthmogenic capacity of MI is currently unknown. In this study, we investigated the capacity of MI to elicit asthma-like responses in a validated mouse model. On days 1 and 8, mice (C57Bl/6 and BALB/c) were dermally treated with MI or vehicle on each ear. On day 15, mice received a single intranasal challenge with MI or vehicle. Immediately after the challenge, the early ventilatory response was measured using a double chamber plethysmograph. One day later, airway hyperreactivity, pulmonary inflammation and immune-related parameters were assessed. Dermal treatment with MI in both C57Bl/6 and BALB/c mice induced increased T- and B-cell proliferation in the auricular lymph nodes, along with IFN-γ production and limited increases in total serum IgE, confirming dermal sensitization. An airway challenge with MI led to an early ventilatory response (decreased breathing frequency), indicative for acute sensory irritation. However, 24h later no allergic respiratory response (no airway hyperreactivity (AHR) nor pulmonary inflammation) was found in either mouse strains. Our study indicates that MI can be classified as a strong dermal sensitizer and irritant, but not an asthmogen after initial dermal sensitization, followed by an airway challenge.
Collapse
|
46
|
Dik S, Ezendam J, Cunningham AR, Carrasquer CA, van Loveren H, Rorije E. Evaluation of in silico models for the identification of respiratory sensitizers. Toxicol Sci 2014; 142:385-94. [PMID: 25239631 DOI: 10.1093/toxsci/kfu188] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Low molecular weight (LMW) respiratory sensitizers can cause occupational asthma but due to a lack of adequate test methods, prospective identification of respiratory sensitizers is currently not possible. This article presents the evaluation of structure-activity relationship (SAR) models as potential methods to prospectively conclude on the sensitization potential of LMW chemicals. The predictive performance of the SARs calculated from their training sets was compared to their performance on a dataset of newly identified respiratory sensitizers and nonsensitizers, derived from literature. The predictivity of the available SARs for new substances was markedly lower than their published predictive performance. For that reason, no single SAR model can be considered sufficiently reliable to conclude on potential LMW respiratory sensitization properties of a substance. The individual applicability domains (ADs) of the models were analyzed for adequacies and deficiencies. Based on these findings, a tiered prediction approach is subsequently proposed. This approach combines the two SARs with the highest positive and negative predictivity taking into account model specific chemical AD issues. The tiered approach provided reliable predictions for one-third of the respiratory sensitizers and nonsensitizers of the external validation set compiled by us. For these chemicals, a positive predictive value of 96% and a negative predictive value of 89% were obtained. The tiered approach was not able to predict the other two-thirds of the chemicals, meaning that additional information is required and that there is an urgent need for other test methods, e.g., in chemico or in vitro, to reach a reliable conclusion.
Collapse
Affiliation(s)
- Sander Dik
- *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
| | - Janine Ezendam
- *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
| | - Albert R Cunningham
- *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
| | - Carl Alex Carrasquer
- *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
| | - Henk van Loveren
- *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
| | - Emiel Rorije
- *Centre for Health Protection, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands, Department of Toxicogenomics, Maastricht University, 6200 MD Maastricht, The Netherlands, James Graham Brown Cancer Center, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202, and Centre for Safety of Substances and Products, National Institute for Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
| |
Collapse
|
47
|
Kimber I, Dearman RJ, Basketter DA, Boverhof DR. Chemical respiratory allergy: reverse engineering an adverse outcome pathway. Toxicology 2014; 318:32-9. [PMID: 24534103 DOI: 10.1016/j.tox.2014.02.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 01/30/2014] [Accepted: 02/04/2014] [Indexed: 01/08/2023]
Abstract
Allergic sensitisation of the respiratory tract by chemicals is associated with rhinitis and asthma and remains an important occupational health issue. Although less than 80 chemicals have been confirmed as respiratory allergens the adverse health effects can be serious, and in rare instances can be fatal, and there are, in addition, related socioeconomic issues. The challenges that chemical respiratory allergy pose for toxicologists are substantial. No validated methods are available for hazard identification and characterisation, and this is due in large part to the fact that there remains considerable uncertainty and debate about the mechanisms through which sensitisation of the respiratory tract is acquired. Despite that uncertainty, there is a need to establish some common understanding of the key events and processes that are involved in respiratory sensitisation to chemicals and that might in turn provide the foundations for novel approaches to safety assessment. In recent years the concept of adverse outcome pathways (AOP) has gained some considerable interest among the toxicology community as a basis for outlining the key steps leading to an adverse health outcome, while also providing a framework for focusing future research, and for developing alternative paradigms for hazard characterisation. Here we explore application of the same general principles to an examination of the induction by chemicals of respiratory sensitisation. In this instance, however, we have chosen to adopt a reverse engineering approach and to model a possible AOP for chemical respiratory allergy working backwards from the elicitation of adverse health effects to the cellular and molecular mechanisms that are implicated in the acquisition of sensitisation.
Collapse
Affiliation(s)
- Ian Kimber
- Faculty of Life Sciences, University of Manchester, Manchester, UK.
| | | | | | - Darrell R Boverhof
- Toxicology and Environmental Research & Consulting, The Dow Chemical Company, Midland, MI, USA
| |
Collapse
|
48
|
Mekenyan O, Patlewicz G, Kuseva C, Popova I, Mehmed A, Kotov S, Zhechev T, Pavlov T, Temelkov S, Roberts DW. A mechanistic approach to modeling respiratory sensitization. Chem Res Toxicol 2014; 27:219-39. [PMID: 24422459 DOI: 10.1021/tx400345b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Chemical respiratory sensitization is an important occupational health problem which may lead to severely incapacitated human health, yet there are currently no validated or widely accepted models for identifying and characterizing the potential of a chemical to induce respiratory sensitization. This is in part due to the ongoing uncertainty about the immunological mechanisms through which respiratory sensitization may be acquired. Despite the lack of test method, regulations such as REACH still require an assessment of respiratory sensitization for risk assessment and/or for the purposes of classification and labeling. The REACH guidance describes an integrated evaluation strategy to characterize what information sources could be available to facilitate such an assessment. The components of this include a consideration of well-established structural alerts and existing data (whether it be derived from read-across, (quantitative) structure-activity relationships ((Q)SAR), in vivo studies etc.). There has been some progress in developing SARs as well as a handful of empirical QSARs. More recently, efforts have been focused on exploring whether the reaction chemistry mechanistic domains first characterized for skin sensitization are relevant for respiratory sensitization and to what extent modifications or refinements are needed to rationalize the differences between the two end points as far as their chemistry is concerned. This study has built upon the adverse outcome pathway (AOP) for skin sensitization that was developed and published by the OECD in 2012. We have structured a workflow to characterize the initiating events that are relevant in driving respiratory sensitization. OASIS pipeline technology was used to encode these events as components in a software platform to enable a prediction of respiratory sensitization potential to be made for new untested chemicals. This prediction platform could be useful in the assessment of respiratory sensitization potential or for grouping chemicals for subsequent read-across.
Collapse
Affiliation(s)
- Ovanes Mekenyan
- Laboratory of Mathematical Chemistry, University "Prof As Zlatarov" , 1 Yakim Street, Bourgas, Bulgaria
| | | | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Natsch A, Haupt T. Utility of rat liver S9 fractions to study skin-sensitizing prohaptens in a modified KeratinoSens assay. Toxicol Sci 2013; 135:356-68. [PMID: 23872582 DOI: 10.1093/toxsci/kft160] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Prohaptens are chemicals, which may cause skin sensitization after being converted into electrophilic molecules by skin enzymes. Aroclor-induced rat liver S9 fractions represent the metabolic activation system most commonly used in in vitro toxicology. This system contains much higher enzyme activities compared with those reported in skin, but it may still serve as a surrogate system to study the potential of chemicals to act as prohaptens. To test this concept, the luciferase induction in KeratinoSens reporter cells treated with chemicals in presence and absence of S9 fractions was measured. Suspected prohaptens such as methyl isoeugenol, eugenol, or trans-anethole gave no, or only weak, ge ne induction in absence of S9 fractions, and a significantly enhanced luciferase induction in presence of S9, proving their prohapten status. Direct-acting haptens like 2,4-dinitrochlorobenzene or cinnamic aldehyde gave a reduced response in presence of S9. We evaluated whether this metabolic activation assay might be implemented in a tiered screening strategy to counter-screen negatives in the KeratinoSens assay to enhance sensitivity. To this aim, all chemicals classified negative were retested with this activation step. Among the 77 chemicals found as correct-negatives, 73 were also negative in presence of metabolic activation, thus this counterscreen would reduce specificity only slightly. However, this comprehensive screening showed that only a small fraction of the known skin sensitizers need activation by the S9 system. Therefore, the KeratinoSens-S9 assay appears useful for the in vitro evaluation of specific classes of potential prohaptens and to mechanistically rationalize their prohapten status.
Collapse
Affiliation(s)
- Andreas Natsch
- Givaudan Schweiz AG, Ueberlandstrasse 138, CH-8600 Duebendorf, Switzerland
| | | |
Collapse
|
50
|
Jaworska J, Dancik Y, Kern P, Gerberick F, Natsch A. Bayesian integrated testing strategy to assess skin sensitization potency: from theory to practice. J Appl Toxicol 2013; 33:1353-64. [DOI: 10.1002/jat.2869] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 02/04/2013] [Accepted: 02/04/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Joanna Jaworska
- Procter & Gamble NV; 100 Temselaan,; 1853; Strombeek - Bever; Belgium
| | - Yuri Dancik
- Procter & Gamble NV; 100 Temselaan,; 1853; Strombeek - Bever; Belgium
| | - Petra Kern
- Procter & Gamble NV; 100 Temselaan,; 1853; Strombeek - Bever; Belgium
| | | | - Andreas Natsch
- Givaudan Schweiz AG; Ueberlandstrasse 138,; CH-8600,; Dübendorf; Switzerland
| |
Collapse
|