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Pierzchalski A, Zenclussen AC, Herberth G. A comprehensive battery of flow cytometric immunoassays for the in vitro testing of chemical effects in human blood cells. Front Immunol 2024; 14:1327960. [PMID: 38229911 PMCID: PMC10790304 DOI: 10.3389/fimmu.2023.1327960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 12/05/2023] [Indexed: 01/18/2024] Open
Abstract
Background There is a growing need for immunological assays to test toxic and modulatory effects of chemicals. The assays should be easy to use, reproducible and superior to cell line-based assays. We have therefore developed a comprehensive portfolio of assays based on primary human blood cells that are suitable for testing chemical effects. Methods The flow cytometry-based assays were designed to target a wide range of human peripheral blood mononuclear cells and whole blood, including T cells, NK cells, B cells, basophils and innate-like T cells such as γδT, MAIT and NKT cells. We have selected a set of activation markers for each immune cell, e.g: CD154 (T cells), CD137, CD107a (NK cells), CD63 (basophils), CD69, CD83 (B cells), CD69, IFN-γ (MAIT cells) and we selected cell specific stimuli: aCD3 antibodies (T cells); E. coli and cytokines IL-12/15/18 (MAIT cells); CpG ODN2006, R848 or aCD40 antibodies (B cells), fMLP or aFcϵR1 (basophils) or K562 cells (NK cells). Results By selecting immune cell-specific markers and cell-specific stimuli, we were able to induce particular immune responses from the targeted immune cells. For example, the response to stimulation with anti-CD3 antibodies was in 36.8% of CD107a+CD8+ cells. Cytokine stimulation induced the production of IFN-γ in 30% of MAIT cells. After stimulation with E. coli, around 50% of MAIT cells produced TNF. About 40% of basophils responded to aFcƐR1 stimulation. Similar activation ranges were achieved in K562-stimulated NK cells. Conclusion Our test portfolio covers the most relevant immune cells present in human blood, providing a solid basis for in vitro toxicity and immunomodulatory testing of chemicals. By using human blood, the natural composition of cells found in the blood can be determined and the effects of chemicals can be detected at the cellular level.
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Affiliation(s)
- Arkadiusz Pierzchalski
- Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Immunology, Leipzig, Germany
| | - Ana C. Zenclussen
- Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Immunology, Leipzig, Germany
- Perinatal Immunology Research Group, Medical Faculty, Saxonian Incubator for Clinical Translation (SIKT), University of Leipzig, Leipzig, Germany
| | - Gunda Herberth
- Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Immunology, Leipzig, Germany
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Nguyen R, Barry M, Azevedo Loiola R, Ferret PJ, Andres E. PhotoSENSIL-18 assay development: Enhancing the safety testing of cosmetic raw materials and finished products to support the in vitro photosensitization assessment? Toxicology 2023; 495:153613. [PMID: 37558156 DOI: 10.1016/j.tox.2023.153613] [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: 04/26/2023] [Revised: 07/07/2023] [Accepted: 08/06/2023] [Indexed: 08/11/2023]
Abstract
Although photosensitization remains a major toxicological endpoint for the safety assessment of cosmetic products and their raw materials, there is no validated in vitro method available for the evaluation of this adverse effect so far. Given that previous studies have proposed that the Interleukine-18 (IL-18) plays a key role in keratinocyte-driven pro-inflammatory responses specific of the skin sensitization process, we hypothesize that IL-18 might be used as a specific biomarker for in vitro photosensitization assessment. The aim of the present study was the set-up of a new in vitro assay using IL-18 as a biomarker for the identification of photosensitizers in a reconstructed human epidermis (RHE) model. EpiCS™ RHE were incubated with a set of 16 known sensitising / phototoxic / photosensitizing substances and exposed to ultra-violet (UV) irradiation. Then, the cell viability was analysed by MTT assay, while the IL-18 secretion was quantified by ELISA. Preliminary assays have shown that 1 h of incubation followed by a recovery period of 23 h induced the highest IL-18 production in response to UV exposure. This protocol was used to test 16 substances and a ratio of IL-18 production (UV+/UV- ratio) was then generated. Our data shows that the cut-off of 1.5 (UV+/UV- ratio) is the most predictive model among the tested conditions, being capable of identifying true positive photosensitizers (8 of 9) with a good prediction in comparison with in vivo data. In a nutshell, our data suggests that the PhotoSENSIL-18 is a promising in vitro method for identification of photosensitizing substances. Although further studies are necessary to optimize the model, we foresee that the PhotoSENSIL-18 assay can be used in the context of an Integrative Approach to Testing and Assessment (IATA) of chemicals.
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Affiliation(s)
- R Nguyen
- Laboratoires Pierre Fabre, 3 avenue Hubert Curien, BP 13562, 31035 Toulouse Cedex, France
| | - M Barry
- Oroxcell SAS, 102 avenue Gaston Roussel, 93230 Romainville, France
| | - R Azevedo Loiola
- Oroxcell SAS, 102 avenue Gaston Roussel, 93230 Romainville, France
| | - P-J Ferret
- Laboratoires Pierre Fabre, 3 avenue Hubert Curien, BP 13562, 31035 Toulouse Cedex, France
| | - E Andres
- Oroxcell SAS, 102 avenue Gaston Roussel, 93230 Romainville, France.
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3
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Quan H, Jun H, Kim K, Lee SK, Heo Y, Seok SH, Na YR. Development of a transcriptome-based determination of innate immune suppressor (TDIS) assay as an in vitro test for immunotoxicity. Arch Toxicol 2023; 97:495-507. [PMID: 36416909 DOI: 10.1007/s00204-022-03406-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Accepted: 10/24/2022] [Indexed: 11/24/2022]
Abstract
Immunotoxicity has been an important topic in toxicology since inadvertent exposures to xenobiotics were found to alter immune functions in humans. While rodent toxicity tests can reveal some levels of immunotoxicity, alternative methods must be developed to identify the detailed mechanisms. In this study, a method of in vitro prediction of innate immune suppression by substances was developed using a genomics approach. The primary selection of immune suppressors was based on their ability to downregulate MCP-1, CCL3, TNF, IL-8, and IL-12p40 expression levels in lipopolysaccharide (LPS)-stimulated THP-1 cells. Among 11 substances classified as potent immune suppressors, six including dexamethasone, tacrolimus, tofacitinib, prednisolone, sodium lauryl sulfate, and benzoic acid were used to create a dataset by transcriptomics of chemical-treated THP-1 cells using bulk RNA sequencing. We selected genes that were significantly upregulated by suppressor treatment while filtering out genes also upregulated in LPS-treated THP-1 cells. We identified a 226-gene immunosuppressive gene set (ISG). Innate immune suppressor signature scores were calculated as the median expression of the ISG. In a validation dataset, the signature score predicted acyclovir, cyclosporine, and mercuric chloride as immune suppressors, while selecting genistein as a non-immune suppressor. Although more dataset integration is needed in the future, our results demonstrated the possibility and utility of a novel genomics-based approach, the transcriptome-based determination of innate immune suppressor (TDIS) assay, to evaluate innate immune suppression by different substances. This provides insight into the development of future alternative testing methods because it reflects a comprehensive genetic signature derived from multiple substances rather than one cytokine.
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Affiliation(s)
- Hailian Quan
- Department of Microbiology and Immunology, Institute of Endemic Disease, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Hyeji Jun
- Biomedical Research Institute, Seoul National University Hospital, Seoul, South Korea
| | - Kwangsoo Kim
- Transdisciplinary Department of Medicine and Advanced Technology, Seoul National University Hospital, Seoul, Republic of Korea
| | - Sung Kwang Lee
- Department of Chemistry, Hannam University, Daejeon, 34054, South Korea
| | - Yong Heo
- Deptartment of Occupational Health, College of Bio and Medical Science, Daegu Catholic University, Hayang-Ro 13-13, Gyeongsan-si, Gyeongbuk Province, Republic of Korea
| | - Seung Hyeok Seok
- Department of Microbiology and Immunology, Institute of Endemic Disease, Seoul National University College of Medicine, Seoul, Republic of Korea. .,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Yi Rang Na
- Transdisciplinary Department of Medicine and Advanced Technology, Seoul National University Hospital, Seoul, Republic of Korea.
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4
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Germolec DR, Lebrec H, Anderson SE, Burleson GR, Cardenas A, Corsini E, Elmore SE, Kaplan BL, Lawrence BP, Lehmann GM, Maier CC, McHale CM, Myers LP, Pallardy M, Rooney AA, Zeise L, Zhang L, Smith MT. Consensus on the Key Characteristics of Immunotoxic Agents as a Basis for Hazard Identification. ENVIRONMENTAL HEALTH PERSPECTIVES 2022; 130:105001. [PMID: 36201310 PMCID: PMC9536493 DOI: 10.1289/ehp10800] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 08/09/2022] [Accepted: 08/26/2022] [Indexed: 05/04/2023]
Abstract
BACKGROUND Key characteristics (KCs), properties of agents or exposures that confer potential hazard, have been developed for carcinogens and other toxicant classes. KCs have been used in the systematic assessment of hazards and to identify assay and data gaps that limit screening and risk assessment. Many of the mechanisms through which pharmaceuticals and occupational or environmental agents modulate immune function are well recognized. Thus KCs could be identified for immunoactive substances and applied to improve hazard assessment of immunodulatory agents. OBJECTIVES The goal was to generate a consensus-based synthesis of scientific evidence describing the KCs of agents known to cause immunotoxicity and potential applications, such as assays to measure the KCs. METHODS A committee of 18 experts with diverse specialties identified 10 KCs of immunotoxic agents, namely, 1) covalently binds to proteins to form novel antigens, 2) affects antigen processing and presentation, 3) alters immune cell signaling, 4) alters immune cell proliferation, 5) modifies cellular differentiation, 6) alters immune cell-cell communication, 7) alters effector function of specific cell types, 8) alters immune cell trafficking, 9) alters cell death processes, and 10) breaks down immune tolerance. The group considered how these KCs could influence immune processes and contribute to hypersensitivity, inappropriate enhancement, immunosuppression, or autoimmunity. DISCUSSION KCs can be used to improve efforts to identify agents that cause immunotoxicity via one or more mechanisms, to develop better testing and biomarker approaches to evaluate immunotoxicity, and to enable a more comprehensive and mechanistic understanding of adverse effects of exposures on the immune system. https://doi.org/10.1289/EHP10800.
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Affiliation(s)
- Dori R. Germolec
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
| | - Herve Lebrec
- Translational Safety & Bioanalytical Sciences, Amgen Research, South San Francisco, California, USA
| | - Stacey E. Anderson
- Allergy and Clinical Immunology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
| | - Gary R. Burleson
- Burleson Research Technologies, Inc., Morrisville, North Carolina, USA
| | - Andres Cardenas
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, Berkeley, California, USA
| | - Emanuela Corsini
- Laboratory of Toxicology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Sarah E. Elmore
- Office of Environmental Health Hazard Assessment, California Environmental Protection Agency, Oakland, California, USA
| | - Barbara L.F. Kaplan
- Department of Comparative Biomedical Sciences, Center for Environmental Health Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi, USA
| | - B. Paige Lawrence
- Department of Environmental Medicine, University of Rochester School of Medicine & Dentistry, Rochester, New York, USA
- Department of Microbiology & Immunology, University of Rochester School of Medicine & Dentistry, Rochester, New York, USA
| | - Geniece M. Lehmann
- Center for Public Health and Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
| | - Curtis C. Maier
- In Vitro In Vivo Translation, Research and Development, GlaxoSmithKline, Collegeville, Pennsylvania, USA
| | - Cliona M. McHale
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, Berkeley, California, USA
| | - L. Peyton Myers
- Division of Pharm/Tox, Office of Infectious Diseases, Office of New Drugs, Center for Drug Evaluation and Research, U.S. Federal Food and Drug Administration, Silver Spring, Maryland, USA
| | - Marc Pallardy
- Inserm, Inflammation microbiome immunosurveillance, Université Paris-Saclay, Châtenay-Malabry, France
| | - Andrew A. Rooney
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
| | - Lauren Zeise
- Office of Environmental Health Hazard Assessment, California Environmental Protection Agency, Oakland, California, USA
| | - Luoping Zhang
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, Berkeley, California, USA
| | - Martyn T. Smith
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, Berkeley, California, USA
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Translatability and transferability of in silico models: context of use switching to predict the effects of environmental chemicals on the immune system. Comput Struct Biotechnol J 2022; 20:1764-1777. [PMID: 35495116 PMCID: PMC9035946 DOI: 10.1016/j.csbj.2022.03.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/23/2022] [Accepted: 03/24/2022] [Indexed: 02/08/2023] Open
Abstract
Immunotoxicity hazard identification of chemicals aims to evaluate the potential for unintended effects of chemical exposure on the immune system. Perfluorinated alkylate substances (PFAS), such as perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), are persistent, globally disseminated environmental contaminants known to be immunotoxic. Elevated PFAS exposure is associated with lower antibody responses to vaccinations in children and in adults. In addition, some studies have reported a correlation between PFAS levels in the body and lower resistance to disease, in other words an increased risk of infections or cancers. In this context, modelling and simulation platforms could be used to simulate the human immune system with the aim to evaluate the adverse effects that immunotoxicants may have. Here, we show the conditions under which a mathematical model developed for one purpose and application (e.g., in the pharmaceutical domain) can be successfully translated and transferred to another (e.g., in the chemicals domain) without undergoing significant adaptation. In particular, we demonstrate that the Universal Immune System Simulator was able to simulate the effects of PFAS on the immune system, introducing entities and new interactions that are biologically involved in the phenomenon. This also revealed a potentially exploitable pathway for assessing immunotoxicity through a computational model.
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6
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Anlar HG, Galbiati V, Corsini E, BaŞaran N. Evaluation of the Possible Role of miRNAs in Chemical Allergen Potency. Turk J Pharm Sci 2020; 17:452-456. [PMID: 32939143 DOI: 10.4274/tjps.galenos.2019.25349] [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: 06/21/2019] [Accepted: 07/25/2019] [Indexed: 12/01/2022]
Abstract
Objectives MicroRNAs (miRNAs) are short, endogenous noncoding RNA molecules that can bind to certain parts of target mRNAs, thereby regulating gene expression. Studies showed that miRNAs could be up- or downregulated in different allergic skin conditions but there is still need for further studies. The aim of this study was to investigate the expression of miRNAs in response to the common contact allergen Bandrowski's base (BB), the principal allergen in patients reacting to p-phenylenediamine (PPD). Materials and Methods The human promyelocytic cell line THP-1 was exposed to BB at a concentration of 1 μg/mL for 24, 48, and 72 h. The dose was selected from the results of cytotoxicity assays. RNA was purified and miRNA expression profile and real-time polymerase chain reaction (RTPCR) were performed to identify up- or downregulated miRNAs and confirm their modulations. Results Among the different modulated miRNAs, the upregulation of miRNA-155 and the downregulation of miRNA-21 were found to be important because these are related to immune system. This expression profile of miRNAs was also confirmed by RT-PCR. Conclusion These preliminary results showed that miR-155 and miR-21 may play a role in the pathogenesis of allergic contact dermatitis, but further studies are needed to clarify their definite roles.
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Affiliation(s)
- Hatice Gül Anlar
- Zonguldak Bülent Ecevit University Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Zonguldak, Turkey
| | - Valentina Galbiati
- Università degli Studi di Milano, Department of Environmental Science and Policy, Milan, Italy
| | - Emanuela Corsini
- Università degli Studi di Milano, Department of Environmental Science and Policy, Milan, Italy
| | - Nurşen BaŞaran
- Hacettepe University Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Ankara, Turkey
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8
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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]
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9
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Schultze N, Wanka H, Zwicker P, Lindequist U, Haertel B. Mitochondrial functions of THP-1 monocytes following the exposure to selected natural compounds. Toxicology 2016; 377:57-63. [PMID: 28013001 DOI: 10.1016/j.tox.2016.12.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 12/19/2016] [Accepted: 12/20/2016] [Indexed: 12/24/2022]
Abstract
The immune system is an important target of various xenobiotics, which may lead to severe adverse effects including immunosuppression or inappropriate immunostimulation. Mitochondrial toxicity is one possibility by which xenobiotics exert their toxic effects in cells or organs. In this study, we investigated the impact of three natural compounds, cyclosporine A (CsA), deoxynivalenol (DON) and cannabidiol (CBD) on mitochondrial functions in the THP-1 monocytic cell line. The cells were exposed for 24h to two different concentrations (IC10 and IC50 determined by MTT) of each compound. The cells showed concentration-dependent elevated intracellular reactive oxygen species (iROS) and induction of apoptosis (except DON) in response to the three test compounds. Mitochondrial functions were characterized by using bioenergetics profiling experiments. In THP-1 monocytes, the IC50 of CsA decreased basal and maximal respiration as well as ATP production with an impact on spare capacity indicating a mitochondrial dysfunction. Similar reaction patterns were observed following CBD exposure. The basal respiration level and ATP-production decreased in the THP-1 cells exposed to the IC50 of DON with no major impact on mitochondrial function. In conclusion, impaired mitochondrial function was accompanied by elevated iROS and apoptosis level in a monocytic cell line exposed to CsA and CBD. Mitochondrial dysfunction may be one explanation for the cytotoxicity of CBD and CsA also in other in immune cells.
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Affiliation(s)
- Nadin Schultze
- Institute of Pharmacy, Pharmaceutical Biology, Ernst-Moritz-Arndt University of Greifswald, D17489 Greifswald, Germany.
| | - Heike Wanka
- Institute of Physiology, University Medicine of Greifswald, D17495 Karlsburg, Germany
| | - Paula Zwicker
- Institute of Pharmacy, Pharmaceutical Biology, Ernst-Moritz-Arndt University of Greifswald, D17489 Greifswald, Germany
| | - Ulrike Lindequist
- Institute of Pharmacy, Pharmaceutical Biology, Ernst-Moritz-Arndt University of Greifswald, D17489 Greifswald, Germany
| | - Beate Haertel
- Institute of Pharmacy, Pharmaceutical Biology, Ernst-Moritz-Arndt University of Greifswald, D17489 Greifswald, Germany
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Andres E, Barry M, Hundt A, Dini C, Corsini E, Gibbs S, Roggen EL, Ferret PJ. Preliminary performance data of the RHE/IL-18 assay performed on SkinEthic ™ RHE for the identification of contact sensitizers. Int J Cosmet Sci 2016; 39:121-132. [PMID: 27455141 DOI: 10.1111/ics.12355] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 07/21/2016] [Indexed: 12/19/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the performances of the RHE/IL-18 assay using the SkinEthic™ RHE model for the identification of contact sensitizers. METHODS A set of 18 substances and mixtures was tested on this epidermal model, following the RHE/IL-18 protocol. The final results of the assay were obtained following 5 interpretation schemes, to determine the optimal prediction model for this assay with this specific test system. The data were analysed with a special focus on the basal level of IL-18 release and on the performance obtained with respect to three different gold standards: LLNA, HRIPT and an integrated reference, constructed from all available results. RESULTS No important differences were found in the performance levels depending on the three gold standards. The performances obtained with the SkinEthic™ RHE model support that this model may be considered as an alternative to different reconstructed epidermis models (EpiDERM™ , EpiCS™ and VUMC-EE) for the performance of RHE/IL-18 assays. CONCLUSION The prediction model to be used was refined, and more substances have to be tested in order to gather enough data for this evaluation and to determine the right criteria applicable for this assay using the SkinEthic™ RHE test system.
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Affiliation(s)
- E Andres
- Oroxcell, 102 Avenue Gaston Roussel, Romainville, 93230, France
| | - M Barry
- Oroxcell, 102 Avenue Gaston Roussel, Romainville, 93230, France
| | - A Hundt
- Oroxcell, 102 Avenue Gaston Roussel, Romainville, 93230, France
| | - C Dini
- Oroxcell, 102 Avenue Gaston Roussel, Romainville, 93230, France
| | - E Corsini
- Laboratory of Toxicology, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via G. Balzaretti, 9, 20133, Milan, Italy
| | - S Gibbs
- Department of Dermatology, VU University Medical Center, De Boelelaan 1117, 1081 HV, Amsterdam, the Netherlands.,Department of Oral Cell Biology, Academic Center for Dentistry Amsterdam, t.a.v. dienst Afspraken & Informatie, University of Amsterdam and VU University, Postbus 7822, 1081 HV, Amsterdam, the Netherlands
| | - E L Roggen
- 3Rs Management & Consulting ApS, Asavaenget 14, 2800 Kongens, Lyngby, Denmark
| | - P-J Ferret
- Institut De Recherche Pierre Fabre, Recherche et Développement Pierre Fabre Dermo Cosmetique, 3 Avenue Hubert Curien, BP 13562, 31035, Toulouse, France
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Ho KK, Campbell KL, Lavergne SN. Contact dermatitis: a comparative and translational review of the literature. Vet Dermatol 2015; 26:314-27, e66-7. [DOI: 10.1111/vde.12229] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/08/2015] [Indexed: 12/31/2022]
Affiliation(s)
- Karen K. Ho
- Veterinary Clinical Medicine; College of Veterinary Medicine; University of Illinois; 1008 W Hazelwood Dr Urbana IL 61802 USA
| | - Karen L. Campbell
- Veterinary Clinical Medicine; College of Veterinary Medicine; University of Illinois; 1008 W Hazelwood Dr Urbana IL 61802 USA
| | - Sidonie N. Lavergne
- Comparative Biosciences; College of Veterinary Medicine; University of Illinois; 2001 South Lincoln Av Urbana IL 61802 USA
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12
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Kravchenko J, Corsini E, Williams MA, Decker W, Manjili MH, Otsuki T, Singh N, Al-Mulla F, Al-Temaimi R, Amedei A, Colacci AM, Vaccari M, Mondello C, Scovassi AI, Raju J, Hamid RA, Memeo L, Forte S, Roy R, Woodrick J, Salem HK, Ryan EP, Brown DG, Bisson WH, Lowe L, Lyerly HK. Chemical compounds from anthropogenic environment and immune evasion mechanisms: potential interactions. Carcinogenesis 2015; 36 Suppl 1:S111-27. [PMID: 26002081 DOI: 10.1093/carcin/bgv033] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 01/19/2015] [Indexed: 02/07/2023] Open
Abstract
An increasing number of studies suggest an important role of host immunity as a barrier to tumor formation and progression. Complex mechanisms and multiple pathways are involved in evading innate and adaptive immune responses, with a broad spectrum of chemicals displaying the potential to adversely influence immunosurveillance. The evaluation of the cumulative effects of low-dose exposures from the occupational and natural environment, especially if multiple chemicals target the same gene(s) or pathway(s), is a challenge. We reviewed common environmental chemicals and discussed their potential effects on immunosurveillance. Our overarching objective was to review related signaling pathways influencing immune surveillance such as the pathways involving PI3K/Akt, chemokines, TGF-β, FAK, IGF-1, HIF-1α, IL-6, IL-1α, CTLA-4 and PD-1/PDL-1 could individually or collectively impact immunosurveillance. A number of chemicals that are common in the anthropogenic environment such as fungicides (maneb, fluoxastrobin and pyroclostrobin), herbicides (atrazine), insecticides (pyridaben and azamethiphos), the components of personal care products (triclosan and bisphenol A) and diethylhexylphthalate with pathways critical to tumor immunosurveillance. At this time, these chemicals are not recognized as human carcinogens; however, it is known that they these chemicalscan simultaneously persist in the environment and appear to have some potential interfere with the host immune response, therefore potentially contributing to promotion interacting with of immune evasion mechanisms, and promoting subsequent tumor growth and progression.
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Affiliation(s)
- Julia Kravchenko
- Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA;
| | - Emanuela Corsini
- Dipartimento di Scienze Farmacologiche e Biomolecolari, School of Pharmacy, Università degli Studi di Milano, 20133 Milan, Italy
| | - Marc A Williams
- MEDCOM Army Institute of Public Health, Toxicology Portfolio - Health Effects Research Program, Aberdeen Proving Ground, Edgewood, Baltimore, MD 21010, USA
| | - William Decker
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Masoud H Manjili
- Department of Microbiology and Immunology, Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Takemi Otsuki
- Department of Hygiene, Kawasaki Medical School, Kurashiki 701-0192, Japan
| | - Neetu Singh
- Advanced Molecular Science Research Centre, King George's Medical University, Lucknow, Uttar Pradesh 226003, India
| | - Faha Al-Mulla
- Department of Pathology, Kuwait University, Safat 13110, Kuwait
| | | | - Amedeo Amedei
- Department of Experimental and Clinical Medicine, University of Firenze, Firenze 50134, Italy
| | - Anna Maria Colacci
- Center for Environmental Carcinogenesis and Risk Assessment, Environmental Protection and Health Prevention Agency, 40126 Bologna, Italy
| | - Monica Vaccari
- Center for Environmental Carcinogenesis and Risk Assessment, Environmental Protection and Health Prevention Agency, 40126 Bologna, Italy
| | - Chiara Mondello
- Institute of Molecular Genetics, National Research Council, Pavia 27100, Italy
| | - A Ivana Scovassi
- Institute of Molecular Genetics, National Research Council, Pavia 27100, Italy
| | - Jayadev Raju
- Toxicology Research Division, Bureau of Chemical Safety, Food Directorate, HPFB, Health Canada, Ottawa, Ontario K1A0K9, Canada
| | - Roslida A Hamid
- Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia
| | - Lorenzo Memeo
- Mediterranean Institute of Oncology, 95029 Viagrande, Italy
| | - Stefano Forte
- Mediterranean Institute of Oncology, 95029 Viagrande, Italy
| | - Rabindra Roy
- Molecular Oncology Program, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Jordan Woodrick
- Molecular Oncology Program, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Hosni K Salem
- Urology Department, Kasr Al-Ainy School of Medicine, Cairo University, El Manial, Cairo 12515, Egypt
| | - Elizabeth P Ryan
- Department of Environmental and Radiological Health Sciences, Colorado State University/ Colorado School of Public Health, Fort Collins, CO, 80523-1680, USA
| | - Dustin G Brown
- Department of Environmental and Radiological Health Sciences, Colorado State University/ Colorado School of Public Health, Fort Collins, CO, 80523-1680, USA
| | - William H Bisson
- Environmental and Molecular Toxicology, Environmental Health Sciences Center, Oregon State University, Corvallis, OR 97331, USA,
| | - Leroy Lowe
- Getting to Know Cancer, Nova Scotia, Canada and
| | - H Kim Lyerly
- Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA; Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA
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13
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Schmeits PCJ, Schaap MM, Luijten M, van Someren E, Boorsma A, van Loveren H, Peijnenburg AACM, Hendriksen PJM. Detection of the mechanism of immunotoxicity of cyclosporine A in murine in vitro and in vivo models. Arch Toxicol 2014; 89:2325-37. [PMID: 25224403 DOI: 10.1007/s00204-014-1365-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 09/04/2014] [Indexed: 01/25/2023]
Abstract
Transcriptomics in combination with in vitro cell systems is a powerful approach to unravel modes of action of toxicants. An important question is to which extent the modes of action as revealed by transcriptomics depend on cell type, species and study type (in vitro or in vivo). To acquire more insight into this, we assessed the transcriptomic effects of the immunosuppressive drug cyclosporine A (CsA) upon 6 h of exposure of the mouse cytotoxic T cell line CTLL-2, the thymoma EL-4 and primary splenocytes and compared these to the effects in spleens of mice orally treated with CsA for 7 days. EL-4 and CTLL-2 cells showed the highest similarities in response. CsA affected many genes in primary splenocytes that were not affected in EL-4 or CTLL-2. Pathway analysis demonstrated that CsA upregulated the unfolded protein response, endoplasmic reticulum stress and NRF2 activation in EL-4 cells, CTLL-2 cells and primary mouse splenocytes but not in mouse spleen in vivo. As expected, CsA downregulated cell cycle and immune response in splenocytes in vitro, spleens in vivo as well as CTLL-2 in vitro. Genes up- and downregulated in human Jurkat, HepG2 and renal proximal tubular cells were similarly affected in CTLL-2, EL-4 and primary splenocytes in vitro. In conclusion, of the models tested in this study, the known mechanism of immunotoxicity of CsA is best represented in the mouse cytotoxic T cell line CTLL-2. This is likely due to the fact that this cell line is cultured in the presence of a T cell activation stimulant (IL-2) making it more suitable to detect inhibitory effects on T cell activation.
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Affiliation(s)
- P C J Schmeits
- RIKILT Institute of Food Safety, Wageningen University and Research Centre, P.O. Box 230, 6700 AE, Wageningen, The Netherlands.
- Department of Toxicogenomics, Maastricht University, P.O. Box 616, 6200 MD, Maastricht, The Netherlands.
| | - M M Schaap
- Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands
- Department of Toxicogenetics, Leiden University Medical Centre, Leiden, The Netherlands
| | - M Luijten
- Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands
- Department of Toxicogenetics, Leiden University Medical Centre, Leiden, The Netherlands
| | - E van Someren
- Department of Toxicogenomics, Maastricht University, P.O. Box 616, 6200 MD, Maastricht, The Netherlands
- Research Group Microbiology and Systems Biology, TNO, P.O. Box 360, 3700 AJ, Zeist, The Netherlands
| | - A Boorsma
- Research Group Microbiology and Systems Biology, TNO, P.O. Box 360, 3700 AJ, Zeist, The Netherlands
| | - H van Loveren
- Department of Toxicogenomics, Maastricht University, P.O. Box 616, 6200 MD, Maastricht, The Netherlands
- Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), P.O. Box 1, 3720 BA, Bilthoven, The Netherlands
| | - A A C M Peijnenburg
- RIKILT Institute of Food Safety, Wageningen University and Research Centre, P.O. Box 230, 6700 AE, Wageningen, The Netherlands
- Department of Toxicogenomics, Maastricht University, P.O. Box 616, 6200 MD, Maastricht, The Netherlands
| | - P J M Hendriksen
- RIKILT Institute of Food Safety, Wageningen University and Research Centre, P.O. Box 230, 6700 AE, Wageningen, The Netherlands.
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14
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Ai W, Huo Y, Liu X, Liu F, Zhou X, Miao Y, Jiang H, Zhang L, Shen L, Piao J, Li B. Relative sensitivities of TDAR, cytokine production, and immunophenotyping assays in immunotoxicity assessment. Toxicol Res (Camb) 2014. [DOI: 10.1039/c4tx00015c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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15
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Schmeits PCJ, van Kol S, van Loveren H, Peijnenburg AACM, Hendriksen PJM. The effects of tributyltin oxide and deoxynivalenol on the transcriptome of the mouse thymoma cell line EL-4. Toxicol Res (Camb) 2014. [DOI: 10.1039/c3tx50100k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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16
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Approaches and considerations for the assessment of immunotoxicity for environmental chemicals: A workshop summary. Regul Toxicol Pharmacol 2014; 68:96-107. [DOI: 10.1016/j.yrtph.2013.11.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 11/14/2013] [Accepted: 11/17/2013] [Indexed: 12/31/2022]
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17
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An epidermal equivalent assay for identification and ranking potency of contact sensitizers. Toxicol Appl Pharmacol 2013; 272:529-41. [DOI: 10.1016/j.taap.2013.07.003] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 06/29/2013] [Accepted: 07/07/2013] [Indexed: 11/23/2022]
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18
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Ai W, Li H, Song N, Li L, Chen H. Optimal method to stimulate cytokine production and its use in immunotoxicity assessment. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2013; 10:3834-42. [PMID: 23985769 PMCID: PMC3799516 DOI: 10.3390/ijerph10093834] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 08/07/2013] [Accepted: 08/15/2013] [Indexed: 11/18/2022]
Abstract
Activation of lymphocytes can effectively produce a large amount of cytokines. The types of cytokines produced may depend on stimulating reagents and treatments. To find an optimal method to stimulate cytokine production and evaluate its effect on immunotoxicity assessments, the authors analyzed production of IL-2, IL-4, IL-6, IL-10, IL-13, IFN-γ, TNF-α, GM-CSF, RANTES and TGF-β in undiluted rat whole blood culture (incubation for 0, 2, 4, 6, 8 or 10 h) with different concentrations of PMA/ionomycin, PHA, Con A, LPS and PWM. We also evaluated the effects of cyclosporin A and azathioprine on cytokine production. The results revealed a rapid increase of IL-2, IFN-γ, TNF-α, RANTES and TGF-β secretion within 6 h after stimulation with 25 ng/mL PMA and 1 μg/mL ionomycin. The inhibition of these cytokine profiles reflected the effects of immunosuppressants on the immune system. Therefore, the results of this is study recommend the detection of cytokine profiles in undiluted whole blood stimulated 6 h with 25 ng/mL PMA and 1 μg/mL ionomycin as a powerful immunotoxicity assessment method.
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Affiliation(s)
- Wenchao Ai
- Chinese Academy of Inspection and Quarantine, Beijing 100123, China.
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19
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Shao J, Katika MR, Schmeits PCJ, Hendriksen PJM, van Loveren H, Peijnenburg AACM, Volger OL. Toxicogenomics-based identification of mechanisms for direct immunotoxicity. Toxicol Sci 2013; 135:328-46. [PMID: 23824090 DOI: 10.1093/toxsci/kft151] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Compounds with direct immunotoxic properties, including metals, mycotoxins, agricultural pesticides, and industrial chemicals, form potential human health risks due to exposure through food, drinking water, and the environment. Insights into the mechanisms of action are currently lacking for the majority of these direct immunotoxicants. Therefore, the present work aimed to gain insights into the molecular mechanisms underlying direct immunotoxicity. To this end, we assessed in vitro the effects of 31 test compounds on the transcriptome of the human Jurkat T-cell line. These compounds included direct immunotoxicants, immunosuppressive drugs with different mode of actions, and nonimmunotoxic control chemicals. Pathway analysis of the microarray data allowed us to identify canonical pathways and Gene Ontology processes that were transcriptionally regulated in common by immunotoxicants (1) with structural similarities, such as tributyltin chloride and tributyltin oxide that activated the retinoic acid/X receptor signaling pathway and (2) without structural similarities, such as As2O3, dibutyltin chloride, diazinon, MeHg, ochratoxin A (OTA), S9-treated OTA, S9-treated cyclophosphamide, and S9-treated benzo[a]pyrene, which activated unfolded protein response, and FTY720, lindane, and propanil, which activated the cholesterol biosynthesis pathway. In addition, processes uniquely affected by individual immunotoxicants were identified, such as the induction of Notch receptor signaling and the downregulation of acute-phase response genes by OTA. These findings were validated by quantitative real-time PCR analysis of genes involved in these processes. Our study indicated that diverse modes of action are involved in direct immunotoxicity and that a set of pathways or genes, rather than one single gene, can be used to screen compounds for direct immunotoxicity.
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Affiliation(s)
- Jia Shao
- * RIKILT-Institute of Food Safety, Wageningen University and Research Centre, 6700 AE Wageningen, The Netherlands
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20
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Dendritic cell migration assay: A potential prediction model for identification of contact allergens. Toxicol In Vitro 2013; 27:1170-9. [DOI: 10.1016/j.tiv.2012.05.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Revised: 05/15/2012] [Accepted: 05/29/2012] [Indexed: 11/18/2022]
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21
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Corsini E, Galbiati V, Mitjans M, Galli CL, Marinovich M. NCTC 2544 and IL-18 production: A tool for the identification of contact allergens. Toxicol In Vitro 2013; 27:1127-34. [DOI: 10.1016/j.tiv.2012.05.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 04/25/2012] [Accepted: 05/03/2012] [Indexed: 10/27/2022]
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22
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Schmeits PCJ, Volger OL, Zandvliet ET, van Loveren H, Peijnenburg AACM, Hendriksen PJM. Assessment of the usefulness of the murine cytotoxic T cell line CTLL-2 for immunotoxicity screening by transcriptomics. Toxicol Lett 2012; 217:1-13. [PMID: 23253260 DOI: 10.1016/j.toxlet.2012.12.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 12/05/2012] [Accepted: 12/06/2012] [Indexed: 10/27/2022]
Abstract
A toxicogenomics approach was applied to assess the usefulness of the mouse cytotoxic T cell line CTLL-2 for in vitro immunotoxicity testing. CTLL-2 cells were exposed for 6 h to two model immunotoxic compounds: (1) the mycotoxin deoxynivalenol (DON, 1 and 2 μM), a ribotoxic stress inducer, and (2) the organotin compound tributyltin oxide (TBTO, 100 and 200 nM), an endoplasmic reticulum (ER) stress inducer. Effects on whole-genome mRNA expression were assessed by microarray analysis. The biological interpretation of the microarray data indicated that TBTO (200 nM) induced genes involved in T cell activation, ER stress, NFκB activation and apoptosis, which agreed very well with results obtained before on TBTO exposed Jurkat cells and mouse primary thymocytes. Remarkably, DON (2 μM) downregulated genes involved in T cell activation, ER stress and apoptosis, which is opposite to results obtained before for DON-exposed Jurkat cells and mouse primary thymocytes. Furthermore, the results for DON in CTLL-2 cells are also opposite to the results obtained for TBTO in CTLL-2 cells. In agreement with the lack of induction of ER stress and apoptosis, viability assays showed that CTLL-2 cells are much more resistant to the toxicity of DON than Jurkat cells and primary thymocytes. We propose that CTLL-2 cells lack the signal transduction that induces ER stress and apoptosis in response to ribotoxic stress. Based on the results for TBTO and DON, the CTLL-2 cell line does not yield an added value for immunotoxicity compared to the human Jurkat T cell line.
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Affiliation(s)
- Peter C J Schmeits
- RIKILT-Institute of Food Safety, Wageningen University and Research Centre, Wageningen, The Netherlands.
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23
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Inter-laboratory study of the in vitro dendritic cell migration assay for identification of contact allergens. Toxicol In Vitro 2011; 25:2124-34. [DOI: 10.1016/j.tiv.2011.09.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Revised: 09/26/2011] [Accepted: 09/27/2011] [Indexed: 11/21/2022]
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24
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Galbiati V, Carne A, Mitjans M, Galli CL, Marinovich M, Corsini E. Isoeugenol destabilizes IL-8 mRNA expression in THP-1 cells through induction of the negative regulator of mRNA stability tristetraprolin. Arch Toxicol 2011; 86:239-48. [PMID: 21969073 DOI: 10.1007/s00204-011-0758-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Accepted: 09/20/2011] [Indexed: 12/13/2022]
Abstract
We previously demonstrated in the human promyelocytic cell line THP-1 that all allergens tested, with the exception of the prohapten isoeugenol, induced a dose-related release of interleukin-8 (IL-8). In the present study, we investigated whether this abnormal behavior was regulated by the AU-rich element-binding proteins HuR and tristetraprolin (TTP) or by the downstream molecule suppressor of cytokine signaling (SOCS)-3. The contact allergens isoeugenol, diethylmaleate (DEM), and 2,4-dinitrochlorobenzene (DNCB), and the irritant salicylic acid were used as reference compounds. Chemicals were used at concentrations that induced a 20% decrease in cell viability as assessed by propidium iodide staining, namely 100 μg/ml (0.61 mM) for isoeugenol, 100 μg/ml (0.58 mM) for DEM, 3 μg/ml (14.8 μM) for DNCB, and 250 μg/ml (1.81 mM) for salicylic acid. Time course experiments of IL-8 mRNA expression and assessment of IL-8 mRNA half-life, indicated a decreased IL-8 mRNA stability in isoeugenol-treated cells. We could demonstrate that a combination and regulation of HuR and TTP following exposure to contact allergens resulted in a different modulation of IL-8 mRNA half-life and release. The increased expression of TTP in THP-1 cells treated with isoeugenol results in destabilization of the IL-8 mRNA, which can account for the lack of IL-8 release. In contrast, the strong allergen DNCB failing to up-regulate TTP, while inducing HuR, resulted in longer IL-8 mRNA half-life and protein release. SOCS-3 was induced only in isoeugenol-treated cells; however, its modulation did not rescue the lack of IL-8 release, indicating that it is unlikely to be involved in the lack of IL-8 production. Finally, the destabilization effect of isoeugenol on IL-8 mRNA expression together with SOCS-3 expression resulted in an anti-inflammatory effect, as demonstrated by the ability of isoeugenol to modulate LPS or ionomycin-induced cytokine release.
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Affiliation(s)
- Valentina Galbiati
- Department of Pharmacological Sciences, Faculty of Pharmacy, Laboratory of Toxicology, Università degli Studi di Milano, Via Balzaretti 9, 20133, Milan, Italy
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Galbiati V, Mitjans M, Lucchi L, Viviani B, Galli CL, Marinovich M, Corsini E. Further development of the NCTC 2544 IL-18 assay to identify in vitro contact allergens. Toxicol In Vitro 2010; 25:724-32. [PMID: 21182927 DOI: 10.1016/j.tiv.2010.12.011] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 12/14/2010] [Accepted: 12/16/2010] [Indexed: 10/18/2022]
Abstract
Several European Union legislations request the use of in vitro methods for toxicological evaluations, including sensitization, in order to increase consumer safety but also to reduce the use of animals. The EU project SENS-IT-IV addresses the need of developing predictive in vitro tests to assess contact and respiratory hypersensitivity reactions. In this context, we have recently reported the possibility to use IL-18 production in the human keratinocyte cell line NCTC 2544 to discriminate contact sensitizer from irritants and low molecular weight respiratory allergens. The aims of the present study were to further develop this assay in order to optimize experimental conditions; to develop a 96-well plate format to establish a high throughput assay; to test the performance of other available keratinocyte cell lines, and to understand the signal transduction pathway involved in p-phenylenediamine (PPD)-induced IL-18 production. If cells reach confluence at the moment of treatment, the ability to identify contact allergens is lost; therefore a careful check for the optimal cell density using PPD as reference contact allergen is critical. In our hands, a cell density of 1-2.5 × 10(5)cells/ml gave optimal stimulation. In order to develop a high throughput test, cells seeded in 96-well plate were exposed to contact allergens (2,4-dinitrochlorobenzene, p-phenylenediamine, isoeugenol, cinnamaldehyde, tetramethylthiuram disulfite, resorcinol, cinnamic alcohol and eugenol), irritants (phenol, sodium laurel sulphate, lactic acid and salicylic acid) and respiratory allergens (hexachloroplatinate, diphenylmethane diisocyanate, trimellitic anhydride). A selective increase in total (intracellular plus released) IL-18 was observed 24h later in cells treated with contact allergens, whereas no changes were observed following treatment with respiratory allergens and irritants, confirming previous results obtained in a 24-well format assay. A selective induction of IL-18 was also obtained testing with PPD other keratinocyte cell lines, namely HPKII and HaCaT, with the HPKII showing the highest stimulation index. Regarding the signal transduction pathway, we could demonstrate using selective inhibitors a role for oxidative stress, NF-κB and p38 MAPK activation in PPD-induced IL-18 production. In conclusion, results obtained suggest that the production of IL-18 represents a promising endpoint for the screening of potential contact allergens. The assay can be performed in a 96-well plate format, different keratinocyte cell lines can be used, and a role for oxidative stress in contact allergen-induced IL-18 was demonstrated.
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Affiliation(s)
- V Galbiati
- Laboratory of Toxicology, Department of Pharmacological Science, Università degli Studi di, Milano, Italy
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26
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House RV, Selgrade MJ. A Quarter-Century of Immunotoxicology: Looking Back, Looking Forward. Toxicol Sci 2010; 118:1-3. [DOI: 10.1093/toxsci/kfq242] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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