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Sahli F, Vileno B, Gourlaouen C, Giménez-Arnau E. Autoxidized citronellol: Free radicals as potential sparkles to ignite the fragrance induced skin sensitizing pathway. Food Chem Toxicol 2022; 166:113201. [PMID: 35671905 DOI: 10.1016/j.fct.2022.113201] [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: 03/28/2022] [Revised: 05/23/2022] [Accepted: 06/01/2022] [Indexed: 11/19/2022]
Abstract
Citronellol, one of the most used fragrance compounds worldwide, is one ingredient of Fragrance Mix II used to assess skin allergy to fragrances in dermatitis patients. Pure citronellol is non-allergenic. Main issue is it autoxidizes when exposed to air becoming then allergenic. The increased skin sensitizing potency of air-exposed citronellol has been attributed to the hydroperoxides detected at high concentrations in the oxidation mixtures. It has been postulated that such hydroperoxides can give rise to specific antigens, although chemical mechanisms involved and the pathogenesis are far from being unraveled. Hydroperoxides are believed to react with skin proteins through mechanisms involving radical intermediates. Here, insights on the potential radicals involved in skin sensitization to citronellol hydroperoxides are given. The employed tool is a multispectroscopic approach based on (i) electron paramagnetic resonance and spin trapping, that confirmed the formation of oxygen- and carbon-radicals when exposing reconstructed human epidermis to concentrations of hydroperoxides close to those used for patch testing patients with air-oxidized citronellol; (ii) liquid chromatography-mass spectrometry, that proved the reaction with amino acids such as cysteine and histidine, known to be involved in radical processes and (iii) density functional theory calculations, that gave an overview on the preferential paths for radical degradation.
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Affiliation(s)
- Fatma Sahli
- Institut de Chimie, UMR 7177, CNRS, Université de Strasbourg, 4 Rue Blaise Pascal, 67000, Strasbourg, France
| | - Bertrand Vileno
- Institut de Chimie, UMR 7177, CNRS, Université de Strasbourg, 4 Rue Blaise Pascal, 67000, Strasbourg, France
| | - Christophe Gourlaouen
- Institut de Chimie, UMR 7177, CNRS, Université de Strasbourg, 4 Rue Blaise Pascal, 67000, Strasbourg, France
| | - Elena Giménez-Arnau
- Institut de Chimie, UMR 7177, CNRS, Université de Strasbourg, 4 Rue Blaise Pascal, 67000, Strasbourg, France.
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Ogueta IA, Christensson JB, Giménez-Arnau E, Brans R, Wilkinson M, Stingeni L, Foti C, Aerts O, Svedman C, Gonçalo M, Giménez-Arnau A. Limonene and linalool hydroperoxides review: pros and cons for routine patch testing. Contact Dermatitis 2022; 87:1-12. [PMID: 35122274 DOI: 10.1111/cod.14064] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Revised: 01/29/2022] [Accepted: 02/02/2022] [Indexed: 12/01/2022]
Abstract
Limonene and linalool are among the most common fragrance terpenes used in products of everyday life. They are pre-haptens forming hydroperoxides (Lim-OOHs, Lin-OOHs) upon oxidation inducing frequent positive patch test reactions in patients with dermatitis. Still, they are not yet routinely tested in Europe. This review evaluates the patch testing experience with Lim-OOHs and Lin-OOHs by answering key questions such as whether hydroperoxide patch testing is warranted, understand difficulties or challenges related to the reading and interpretation of hydroperoxide patch test results with currently available material, assessing their relevance. Studies are increasingly pointing out to high percentages of positive reactions in patients consecutively patch tested with these oxidized products. An association between a positive clinical history and a strong patch test reaction has been described, but problems with doubtful/irritant reactions have also been reported. Considering the high frequencies of relevant positive reactions, the incorporation of Lim-OOHs 0.3% and Lin-OOHs 1% in the baseline series could be discussed and is maybe justified. Since exposure, sensitization and elicitation limits of Lim-OOHs and Lin-OOHs in the products still need to be better determined, an assessment of previous exposure, possible sensitizations and reactions may help to improve the clinical assessment. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Isabel A Ogueta
- Department of Dermatology, Hospital del Mar, IMIM, Universitat Autònoma. Barcelona, Spain.,Department of Dermatology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Chile
| | - Johanna Brared Christensson
- Dermatochemistry and Skin Allergy, Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden. Citysjukhuset +7, Gothenburg, Sweden
| | - Elena Giménez-Arnau
- Dermatochemistry Laboratory, University of Strasbourg, Institute of Chemistry CNRS UMR 7177, Strasbourg, France
| | - Richard Brans
- Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, Osnabrück, Germany
| | - Mark Wilkinson
- Dermatology, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Luca Stingeni
- Dermatology Section, Department of Medicine and Surgery, University of Perugia, Perugia, Italy
| | - Caterina Foti
- Department of Biomedical Science and Human Oncology, Dermatology Section, University of Bari "Aldo Moro", Bari, Italy
| | - Olivier Aerts
- University Hospital Antwerp (UZA) and University of Antwerp, Antwerp, Belgium
| | - Cecilia Svedman
- Department of Occupational and Environmental Dermatology, Skane University Hospital, Lund University, Malmö, Sweden
| | - Margarida Gonçalo
- Department of Dermatology, University Hospital and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Ana Giménez-Arnau
- Department of Dermatology, Hospital del Mar, IMIM, Universitat Autònoma. Barcelona, Spain
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Vileno B, Port-Lougarre Y, Giménez-Arnau E. Electron paramagnetic resonance and spin trapping to detect free radicals from allergenic hydroperoxides in contact with the skin: from the molecule to the tissue. Contact Dermatitis 2022; 86:241-253. [PMID: 34982482 DOI: 10.1111/cod.14037] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 11/22/2021] [Accepted: 12/13/2021] [Indexed: 11/29/2022]
Abstract
A major research topic consists of revealing the contribution of radical-mediated reactions in dermatological diseases related to xenobiotic-induced stress, to succeed risk assessment procedures protecting producers and consumers. Allergic contact dermatitis is the clinically relevant consequence of skin sensitization, one of the most critical occupational and environmental health issues related to xenobiotics exposure. The first key event identified for the skin sensitization process to a chemical is its aptitude to react with epidermal proteins and form antigenic structures that will further trigger the immune response. Many chemical sensitizers are suspected to react through mechanisms involving radical intermediates. This review focuses on recent progress we have accomplished over the last few years studying radical intermediates derived from skin sensitizing chemicals by electron paramagnetic resonance in combination with the spin trapping technique. Our work is carried out "from the molecule", performing studies in solution, "to the tissue", by the development of a methodology on a reconstructed human epidermis model, very close in terms of histology and metabolic/enzymatic activity to real human epidermis, that can be used as suitable biological tissue model. The benefits are to test chemicals under conditions close to human use and real-life sensitization exposures and benefit from the 3D microenvironment. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Bertrand Vileno
- POMAM Laboratory, CNRS, Institute of Chemistry UMR 7177, University of Strasbourg, Strasbourg, France
| | - Yannick Port-Lougarre
- Dermatochemistry Laboratory, CNRS, Institute of Chemistry UMR 7177, University of Strasbourg, Strasbourg, France
| | - Elena Giménez-Arnau
- Dermatochemistry Laboratory, CNRS, Institute of Chemistry UMR 7177, University of Strasbourg, Strasbourg, France
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Leitão EFV, Angelo Fonseca de Souza M, do Monte SA, Ventura E. Competition between electron transfer and base-induced elimination mechanisms in the gas-phase reactions of superoxide with alkyl hydroperoxides. Phys Chem Chem Phys 2021; 23:5583-5595. [PMID: 33655284 DOI: 10.1039/d0cp05761d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the mechanism responsible for peroxides decomposition is essential to explain several biochemical processes. The mechanisms of the intrinsic reactions between the superoxide radical anion (O2˙-) and methyl, ethyl, and tert-butyl hydroperoxides (ROOH, with R = Me, Et, and t-Bu) have been characterized to understand the mechanism responsible for peroxides decomposition. The reaction energy diagrams suggest a competition between the spin-allowed and spin-forbidden electron transfer (ET), and base-induced elimination (ECO2) mechanisms. In all cases, the spin-allowed ET mechanism describes formation of the ozonide anion radical (O3˙-), either complexed with an alcohol molecule or separated. For the O2˙-/MeOOH(EtOOH) reactions, HCO2- (MeCO2-) + H2O + HO˙ and OH- + CH2O(MeCHO) + HO2˙ products are associated with the spin-forbidden ET and ECO2 channels, respectively. On the other hand, for the reaction between O2˙- and t-BuOOH, the spin-forbidden ET route describes formation of the MeCOCH2- enolate (either separated or hydrated) along with the methyl peroxyl (MeO2˙) radical. In addition, the regeneration of O2˙-via spin-forbidden ET and ECO2 channels was also characterized from the decomposition of ROOH, yielding diols (CH2(OH)2 and MeCH(OH)2), aldehydes (CH2O and MeCHO), and oxirane (cyc-CH2CMe2O).
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Affiliation(s)
- Ezequiel Fragoso Vieira Leitão
- Unidade Acadêmica de Ciências Exatas e da Natureza, Universidade Federal de Campina Grande, Cajazeiras, PB 58900-000, Brazil.
| | | | - Silmar Andrade do Monte
- Departamento de Química, CCEN, Universidade Federal da Paraíba, João Pessoa, PB 58-059-900, Brazil
| | - Elizete Ventura
- Departamento de Química, CCEN, Universidade Federal da Paraíba, João Pessoa, PB 58-059-900, Brazil
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Lepoittevin JP, Lafforgue C. Molecular Aspects in Allergic and Irritant Contact Dermatitis. Contact Dermatitis 2021. [DOI: 10.1007/978-3-030-36335-2_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lichter J, Silva E Sousa M, Peter N, Sahli F, Vileno B, Kuresepi S, Gourlaouen C, Giménez-Arnau E, Blömeke B. Skin sensitization to fragrance hydroperoxides: interplay between dendritic cells, keratinocytes and free radicals. Br J Dermatol 2020; 184:1143-1152. [PMID: 33205411 DOI: 10.1111/bjd.19685] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND Skin sensitization to hydroperoxides (R-OOHs) of the commonly used fragrance terpenes limonene, linalool and citronellol is frequently reported. R-OOHs are believed to initiate the process leading to sensitization and allergic contact dermatitis through mechanisms involving radical intermediates. Thus, radical intermediates, keratinocytes and dendritic cells (DCs) may act in concert to initiate the process. OBJECTIVES To evaluate individual DC activation profiles by R-OOHs in the context of keratinocytes with regard to frequency, specificity and magnitude of upregulation. METHODS We used 2D and 3D cocultures with keratinocytes/reconstructed human epidermis (RHE) and DCs to evaluate cell surface levels of the costimulatory molecules CD86, CD80 and the adhesion molecule CD54 on cocultured DCs. Analysis of radical formation from limonene hydroperoxides in RHE was performed using electron paramagnetic resonance combined with the spin trapping technique. RESULTS R-OOHs induce donor-dependent DC activation. Major differences were found between the limonene-OOHs. Limonene-1-OOH was stronger with respect to both frequency and magnitude of response. Using a 3D coculture model, no DC activation was detected after topical application of 0·2% limonene-OOHs (20 µg cm-2 ), while 1·2% limonene-1-OOH or 2% limonene-2-OOH induced DC activation. Furthermore, we demonstrated differences in the carbon and oxygen radicals formed from the limonene-OOHs using RHE, mimicking what may happen in vivo. CONCLUSIONS We report clear individual differences in DC maturation induced by the most important hydroperoxides. Response rates and magnitude of response both indicate that very small structural alterations in the hydroperoxides are translated into specific DC responses. In addition, we provide more insight into the amounts of hydroperoxides that can activate DCs and induce sensitization.
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Affiliation(s)
- J Lichter
- Department of Environmental Toxicology, Trier University, Trier, Germany
| | - M Silva E Sousa
- Department of Environmental Toxicology, Trier University, Trier, Germany
| | - N Peter
- Department of Environmental Toxicology, Trier University, Trier, Germany
| | - F Sahli
- Dermatochemistry Laboratory, University of Strasbourg, Institute of Chemistry, CNRS UMR 7177, Strasbourg, France
| | - B Vileno
- POMAM Laboratory, University of Strasbourg, Institute of Chemistry, CNRS UMR 7177, Strasbourg, France.,French EPR Federation of Research, Réseau NAtional de Rpe interDisciplinaire (RENARD, Fédération IR-RPE CNRS #3443), Strasbourg, France
| | - S Kuresepi
- Dermatochemistry Laboratory, University of Strasbourg, Institute of Chemistry, CNRS UMR 7177, Strasbourg, France
| | - C Gourlaouen
- Laboratoire de Chimie Quantique, University of Strasbourg, Institute of Chemistry, CNRS UMR 7177, Strasbourg, France
| | - E Giménez-Arnau
- Dermatochemistry Laboratory, University of Strasbourg, Institute of Chemistry, CNRS UMR 7177, Strasbourg, France
| | - B Blömeke
- Department of Environmental Toxicology, Trier University, Trier, Germany
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Kuresepi S, Vileno B, Lepoittevin JP, Giménez-Arnau E. Mechanistic Insights on Skin Sensitization to Linalool Hydroperoxides: EPR Evidence on Radical Intermediates Formation in Reconstructed Human Epidermis and 13C NMR Reactivity Studies with Thiol Residues. Chem Res Toxicol 2020; 33:1922-1932. [PMID: 32441093 DOI: 10.1021/acs.chemrestox.0c00125] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Linalool is one of the most commonly used fragrance terpenes in consumer products. While pure linalool is considered as non-allergenic because it has a very low skin sensitization potential, its autoxidation on air leads to allylic hydroperoxides that have been shown to be major skin sensitizers. These hydroperoxides have the potential to form antigens via radical mechanisms. In order to obtain in-depth insights of such reactivity, we first investigated the formation of free radicals derived from linalool hydroperoxides in situ in a model of human reconstructed epidermis by electron paramagnetic resonance combined with spin trapping. The formation of carbon- and oxygen-centered radical species derived from the hydroperoxides was especially evidenced in an epidermis model, mimicking human skin and thus closer to what may happen in vivo. To further investigate these results, we synthesized linalool hydroperoxides containing a 13C-substitution at positions precursor of carbon radicals to elucidate if one of these positions could react with cysteine, its thiol chemical function being one of the most labile groups prone to react through radical mechanisms. Reactions were followed by mono- and bidimensional 13C NMR. We validated that carbon radicals derived from allylic hydrogen abstraction by the initially formed alkoxyl radical and/or from its β-scission can alter directly the lateral chain of cysteine forming adducts via radical processes. Such results provide an original vision on the mechanisms likely involved in the reaction with thiol groups that might be present in the skin environment. Consequently, the present findings are a step ahead toward the understanding of protein binding processes to allergenic allylic hydroperoxides of linalool through the involvement of free radical species and thus of their sensitizing potential.
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Affiliation(s)
- Salen Kuresepi
- Dermatochemistry Laboratory, University of Strasbourg, CNRS, UMR 7177, F-67000 Strasbourg, France
| | - Bertrand Vileno
- POMAM Laboratory, University of Strasbourg, CNRS, UMR 7177, F-67000 Strasbourg, France.,French EPR Federation of Research, REseau NAtional de RPE interDisciplinaire, RENARD, Fédération IR-RPE CNRS 3443, F-67000 Strasbourg, France
| | - Jean-Pierre Lepoittevin
- Dermatochemistry Laboratory, University of Strasbourg, CNRS, UMR 7177, F-67000 Strasbourg, France
| | - Elena Giménez-Arnau
- Dermatochemistry Laboratory, University of Strasbourg, CNRS, UMR 7177, F-67000 Strasbourg, France
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Lepoittevin JP, Lafforgue C. Molecular Aspects in Allergic and Irritant Contact Dermatitis. Contact Dermatitis 2020. [DOI: 10.1007/978-3-319-72451-5_4-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sahli F, Godard A, Vileno B, Lepoittevin JP, Giménez-Arnau E. Formation of methyl radicals derived from cumene hydroperoxide in reconstructed human epidermis: an EPR spin trapping confirmation by using 13C-substitution. Free Radic Res 2019; 53:737-747. [PMID: 31130017 DOI: 10.1080/10715762.2019.1624741] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Dermal exposure to cumene hydroperoxide (CumOOH) during manufacturing processes is a toxicological issue for the industry. Its genotoxicity, mutagenic action, ability to promote skin tumour, capacity to induce epidermal hyperplasia, and aptitude to induce allergic and irritant skin contact dermatitis are well known. These toxic effects appear to be mediated through the activation to free radical species such as hydroxyl, alkoxyl, and alkyl radicals characterised basically by electron paramagnetic resonance (EPR) and spin-trapping (ST) techniques. To be a skin sensitiser CumOOH needs to covalently bind to skin proteins in the epidermis to form the antigenic entity triggering the immunotoxic reaction. Cleavage of the O-O bond allows formation of unstable CumO•/CumOO• radicals rearranging to longer half-life specific carbon-centred radicals R• proposed to be at the origin of the antigen formation. Nevertheless, it is not still clear which R• is precisely formed in the epidermis and thus involved in the sensitisation process. The aim of this work was to elucidate in conditions closer to real-life sensitisation which specific R• are formed in a 3D reconstructed human epidermis (RHE) model by using 13C-substituted CumOOH at carbon positions precursors of potentially reactive radicals and EPR-ST. We demonstrated that most probably methyl radicals derived from β-scission of CumO• radicals occur in RHE through a one-electron reductive pathway suggesting that these could be involved in the antigen formation inducing skin sensitisation. We also describe a coupling between nitroxide radicals and β position 13C atoms that could be of an added value to the very few examples existing for the coupling of radicals with 13C atoms.
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Affiliation(s)
- Fatma Sahli
- a Dermatochemistry Laboratory, University of Strasbourg-CNRS UMR 7177 , Strasbourg , France
| | - Amélie Godard
- a Dermatochemistry Laboratory, University of Strasbourg-CNRS UMR 7177 , Strasbourg , France
| | - Bertrand Vileno
- b POMAM Laboratory, University of Strasbourg-CNRS UMR 7177 , Strasbourg , France.,c French EPR Federation of Research, REseau NAtional de Rpe InterDisciplinaire (RENARD) , France
| | | | - Elena Giménez-Arnau
- a Dermatochemistry Laboratory, University of Strasbourg-CNRS UMR 7177 , Strasbourg , France
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Schellenberger MT, Bock U, Hennen J, Groeber-Becker F, Walles H, Blömeke B. A coculture system composed of THP-1 cells and 3D reconstructed human epidermis to assess activation of dendritic cells by sensitizing chemicals after topical exposure. Toxicol In Vitro 2019; 57:62-66. [DOI: 10.1016/j.tiv.2019.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 01/28/2019] [Accepted: 02/05/2019] [Indexed: 12/22/2022]
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Sahli F, Sousa MSE, Vileno B, Lichter J, Lepoittevin JP, Blömeke B, Giménez-Arnau E. Understanding the skin sensitization capacity of ascaridole: a combined study of chemical reactivity and activation of the innate immune system (dendritic cells) in the epidermal environment. Arch Toxicol 2019; 93:1337-1347. [DOI: 10.1007/s00204-019-02444-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 04/09/2019] [Indexed: 01/08/2023]
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