1
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Zubkevich S, Makarov M, Dieden R, Puchot L, Berthé V, Westermann S, Shaplov AS, Schmidt DF. Unique Method for Facile Postsynthetic Modification of Nonisocyanate Polyurethanes. Macromolecules 2024; 57:2385-2393. [PMID: 38495389 PMCID: PMC10938877 DOI: 10.1021/acs.macromol.3c02232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 12/20/2023] [Accepted: 01/15/2024] [Indexed: 03/19/2024]
Abstract
Nonisocyanate polyurethanes (NIPUs) are broadly investigated as a potential replacement for conventional polyurethanes (PUs) to eliminate the use of toxic isocyanates and reduce occupational hazards. One of the most popular approaches to NIPU synthesis is the polyaddition of cyclic bis(carbonate)s and diamines to form poly(hydroxyurethane)s (PHUs). However, such PHUs are highly hydrophilic due to the presence of two hydroxyl groups per repeat unit, and the resulting moisture absorption significantly degrades their thermomechanical performance and physical stability upon exposure to humidity, thus limiting their utility. Here, we introduce a simple and scalable approach for the modification of PHUs to increase hydrophobicity and adjust their properties. The proposed reaction between aldehydes and appropriately spaced hydroxyl groups in the polymer backbone resulted in high degrees of modification (up to 84%) and up to 3-fold reductions in water uptake at 85% RH. Furthermore, the use of aromatic aldehydes in particular enabled the retention of mechanical properties over a wide range of humidity levels, resulting in performance comparable to conventional PUs. Finally, we note that this approach is not limited to reducing moisture sensitivity alone and provides ample opportunities for imparting a broad range of novel properties to PHUs through an appropriate selection of functional aldehydes.
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Affiliation(s)
- Sergei
V. Zubkevich
- Luxembourg Institute of
Science and Technology (LIST), 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Maksim Makarov
- Luxembourg Institute of
Science and Technology (LIST), 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Reiner Dieden
- Luxembourg Institute of
Science and Technology (LIST), 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Laura Puchot
- Luxembourg Institute of
Science and Technology (LIST), 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Vincent Berthé
- Luxembourg Institute of
Science and Technology (LIST), 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Stephan Westermann
- Luxembourg Institute of
Science and Technology (LIST), 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Alexander S. Shaplov
- Luxembourg Institute of
Science and Technology (LIST), 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
| | - Daniel F. Schmidt
- Luxembourg Institute of
Science and Technology (LIST), 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg
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2
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Wise SK, Damask C, Roland LT, Ebert C, Levy JM, Lin S, Luong A, Rodriguez K, Sedaghat AR, Toskala E, Villwock J, Abdullah B, Akdis C, Alt JA, Ansotegui IJ, Azar A, Baroody F, Benninger MS, Bernstein J, Brook C, Campbell R, Casale T, Chaaban MR, Chew FT, Chambliss J, Cianferoni A, Custovic A, Davis EM, DelGaudio JM, Ellis AK, Flanagan C, Fokkens WJ, Franzese C, Greenhawt M, Gill A, Halderman A, Hohlfeld JM, Incorvaia C, Joe SA, Joshi S, Kuruvilla ME, Kim J, Klein AM, Krouse HJ, Kuan EC, Lang D, Larenas-Linnemann D, Laury AM, Lechner M, Lee SE, Lee VS, Loftus P, Marcus S, Marzouk H, Mattos J, McCoul E, Melen E, Mims JW, Mullol J, Nayak JV, Oppenheimer J, Orlandi RR, Phillips K, Platt M, Ramanathan M, Raymond M, Rhee CS, Reitsma S, Ryan M, Sastre J, Schlosser RJ, Schuman TA, Shaker MS, Sheikh A, Smith KA, Soyka MB, Takashima M, Tang M, Tantilipikorn P, Taw MB, Tversky J, Tyler MA, Veling MC, Wallace D, Wang DY, White A, Zhang L. International consensus statement on allergy and rhinology: Allergic rhinitis - 2023. Int Forum Allergy Rhinol 2023; 13:293-859. [PMID: 36878860 DOI: 10.1002/alr.23090] [Citation(s) in RCA: 72] [Impact Index Per Article: 72.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 11/11/2022] [Accepted: 09/13/2022] [Indexed: 03/08/2023]
Abstract
BACKGROUND In the 5 years that have passed since the publication of the 2018 International Consensus Statement on Allergy and Rhinology: Allergic Rhinitis (ICAR-Allergic Rhinitis 2018), the literature has expanded substantially. The ICAR-Allergic Rhinitis 2023 update presents 144 individual topics on allergic rhinitis (AR), expanded by over 40 topics from the 2018 document. Originally presented topics from 2018 have also been reviewed and updated. The executive summary highlights key evidence-based findings and recommendation from the full document. METHODS ICAR-Allergic Rhinitis 2023 employed established evidence-based review with recommendation (EBRR) methodology to individually evaluate each topic. Stepwise iterative peer review and consensus was performed for each topic. The final document was then collated and includes the results of this work. RESULTS ICAR-Allergic Rhinitis 2023 includes 10 major content areas and 144 individual topics related to AR. For a substantial proportion of topics included, an aggregate grade of evidence is presented, which is determined by collating the levels of evidence for each available study identified in the literature. For topics in which a diagnostic or therapeutic intervention is considered, a recommendation summary is presented, which considers the aggregate grade of evidence, benefit, harm, and cost. CONCLUSION The ICAR-Allergic Rhinitis 2023 update provides a comprehensive evaluation of AR and the currently available evidence. It is this evidence that contributes to our current knowledge base and recommendations for patient evaluation and treatment.
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Affiliation(s)
- Sarah K Wise
- Otolaryngology-HNS, Emory University, Atlanta, Georgia, USA
| | - Cecelia Damask
- Otolaryngology-HNS, Private Practice, University of Central Florida, Lake Mary, Florida, USA
| | - Lauren T Roland
- Otolaryngology-HNS, Washington University, St. Louis, Missouri, USA
| | - Charles Ebert
- Otolaryngology-HNS, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Joshua M Levy
- Otolaryngology-HNS, Emory University, Atlanta, Georgia, USA
| | - Sandra Lin
- Otolaryngology-HNS, University of Wisconsin, Madison, Wisconsin, USA
| | - Amber Luong
- Otolaryngology-HNS, McGovern Medical School of the University of Texas, Houston, Texas, USA
| | - Kenneth Rodriguez
- Otolaryngology-HNS, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | - Ahmad R Sedaghat
- Otolaryngology-HNS, University of Cincinnati, Cincinnati, Ohio, USA
| | - Elina Toskala
- Otolaryngology-HNS, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | | | - Baharudin Abdullah
- Otolaryngology-HNS, Universiti Sains Malaysia, Kubang, Kerian, Kelantan, Malaysia
| | - Cezmi Akdis
- Immunology, Infectious Diseases, Swiss Institute of Allergy and Asthma Research, Davos, Switzerland
| | - Jeremiah A Alt
- Otolaryngology-HNS, University of Utah, Salt Lake City, Utah, USA
| | | | - Antoine Azar
- Allergy/Immunology, Johns Hopkins University, Baltimore, Maryland, USA
| | - Fuad Baroody
- Otolaryngology-HNS, University of Chicago, Chicago, Illinois, USA
| | | | | | - Christopher Brook
- Otolaryngology-HNS, Harvard University, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
| | - Raewyn Campbell
- Otolaryngology-HNS, Macquarie University, Sydney, NSW, Australia
| | - Thomas Casale
- Allergy/Immunology, University of South Florida College of Medicine, Tampa, Florida, USA
| | - Mohamad R Chaaban
- Otolaryngology-HNS, Cleveland Clinic, Case Western Reserve University, Cleveland, Ohio, USA
| | - Fook Tim Chew
- Allergy/Immunology, Genetics, National University of Singapore, Singapore, Singapore
| | - Jeffrey Chambliss
- Allergy/Immunology, University of Texas Southwestern, Dallas, Texas, USA
| | - Antonella Cianferoni
- Allergy/Immunology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | | | | | | | - Anne K Ellis
- Allergy/Immunology, Queens University, Kingston, ON, Canada
| | | | - Wytske J Fokkens
- Otorhinolaryngology, Amsterdam University Medical Centres, Amsterdam, Netherlands
| | | | - Matthew Greenhawt
- Allergy/Immunology, Pediatrics, University of Colorado, Children's Hospital Colorado, Aurora, Colorado, USA
| | - Amarbir Gill
- Otolaryngology-HNS, University of Michigan, Ann Arbor, Michigan, USA
| | - Ashleigh Halderman
- Otolaryngology-HNS, University of Texas Southwestern, Dallas, Texas, USA
| | - Jens M Hohlfeld
- Respiratory Medicine, Fraunhofer Institute for Toxicology and Experimental Medicine ITEM, Hannover Medical School, German Center for Lung Research, Hannover, Germany
| | | | - Stephanie A Joe
- Otolaryngology-HNS, University of Illinois Chicago, Chicago, Illinois, USA
| | - Shyam Joshi
- Allergy/Immunology, Oregon Health and Science University, Portland, Oregon, USA
| | | | - Jean Kim
- Otolaryngology-HNS, Johns Hopkins University, Baltimore, Maryland, USA
| | - Adam M Klein
- Otolaryngology-HNS, Emory University, Atlanta, Georgia, USA
| | - Helene J Krouse
- Otorhinolaryngology Nursing, University of Texas Rio Grande Valley, Edinburg, Texas, USA
| | - Edward C Kuan
- Otolaryngology-HNS, University of California Irvine, Orange, California, USA
| | - David Lang
- Allergy/Immunology, Cleveland Clinic, Cleveland, Ohio, USA
| | | | | | - Matt Lechner
- Otolaryngology-HNS, University College London, Barts Health NHS Trust, London, UK
| | - Stella E Lee
- Otolaryngology-HNS, Brigham and Women's Hospital, Boston, Massachusetts, USA
| | - Victoria S Lee
- Otolaryngology-HNS, University of Illinois Chicago, Chicago, Illinois, USA
| | - Patricia Loftus
- Otolaryngology-HNS, University of California San Francisco, San Francisco, California, USA
| | - Sonya Marcus
- Otolaryngology-HNS, Stony Brook University, Stony Brook, New York, USA
| | - Haidy Marzouk
- Otolaryngology-HNS, State University of New York Upstate, Syracuse, New York, USA
| | - Jose Mattos
- Otolaryngology-HNS, University of Virginia, Charlottesville, Virginia, USA
| | - Edward McCoul
- Otolaryngology-HNS, Ochsner Clinic, New Orleans, Louisiana, USA
| | - Erik Melen
- Pediatric Allergy, Karolinska Institutet, Stockholm, Sweden
| | - James W Mims
- Otolaryngology-HNS, Wake Forest University, Winston Salem, North Carolina, USA
| | - Joaquim Mullol
- Otorhinolaryngology, Hospital Clinic Barcelona, Barcelona, Spain
| | - Jayakar V Nayak
- Otolaryngology-HNS, Stanford University, Palo Alto, California, USA
| | - John Oppenheimer
- Allergy/Immunology, Rutgers, State University of New Jersey, Newark, New Jersey, USA
| | | | - Katie Phillips
- Otolaryngology-HNS, University of Cincinnati, Cincinnati, Ohio, USA
| | - Michael Platt
- Otolaryngology-HNS, Boston University, Boston, Massachusetts, USA
| | | | | | - Chae-Seo Rhee
- Rhinology/Allergy, Seoul National University Hospital and College of Medicine, Seoul, Korea
| | - Sietze Reitsma
- Otolaryngology-HNS, University of Amsterdam, Amsterdam, Netherlands
| | - Matthew Ryan
- Otolaryngology-HNS, University of Texas Southwestern, Dallas, Texas, USA
| | - Joaquin Sastre
- Allergy, Fundacion Jiminez Diaz, University Autonoma de Madrid, Madrid, Spain
| | - Rodney J Schlosser
- Otolaryngology-HNS, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Theodore A Schuman
- Otolaryngology-HNS, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Marcus S Shaker
- Allergy/Immunology, Dartmouth Geisel School of Medicine, Lebanon, New Hampshire, USA
| | - Aziz Sheikh
- Primary Care, University of Edinburgh, Edinburgh, Scotland
| | - Kristine A Smith
- Otolaryngology-HNS, University of Utah, Salt Lake City, Utah, USA
| | - Michael B Soyka
- Otolaryngology-HNS, University of Zurich, University Hospital of Zurich, Zurich, Switzerland
| | - Masayoshi Takashima
- Otolaryngology-HNS, Houston Methodist Academic Institute, Houston, Texas, USA
| | - Monica Tang
- Allergy/Immunology, University of California San Francisco, San Francisco, California, USA
| | | | - Malcolm B Taw
- Integrative East-West Medicine, University of California Los Angeles, Westlake Village, California, USA
| | - Jody Tversky
- Allergy/Immunology, Johns Hopkins University, Baltimore, Maryland, USA
| | - Matthew A Tyler
- Otolaryngology-HNS, University of Minnesota, Minneapolis, Minnesota, USA
| | - Maria C Veling
- Otolaryngology-HNS, University of Texas Southwestern, Dallas, Texas, USA
| | - Dana Wallace
- Allergy/Immunology, Nova Southeastern University, Ft. Lauderdale, Florida, USA
| | - De Yun Wang
- Otolaryngology-HNS, National University of Singapore, Singapore, Singapore
| | - Andrew White
- Allergy/Immunology, Scripps Clinic, San Diego, California, USA
| | - Luo Zhang
- Otolaryngology-HNS, Beijing Tongren Hospital, Beijing, China
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3
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Maquilón C, Brandolese A, Alter C, Hövelmann CH, Della Monica F, Kleij AW. Renewable Beta-Elemene Based Cyclic Carbonates for the Preparation of Oligo(hydroxyurethane)s. CHEMSUSCHEM 2022; 15:e202201123. [PMID: 35757910 PMCID: PMC9541927 DOI: 10.1002/cssc.202201123] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 06/25/2022] [Indexed: 06/14/2023]
Abstract
Conversion of β-elemene into new β-elemene dicarbonates through epoxidation and halide salt-catalyzed CO2 cycloaddition reactions is reported. Step-growth polyaddition of this dicarbonate to five different, commercial diamines was investigated under neat conditions at 150 °C yielding non-isocyanate-based low molecular weight oligo(hydroxyurethane)s with 1.3≤Mn ≤6.3 kDa and 1.3≤Ð≤2.1, and with glass transition temperatures ranging from -59 to 84 °C. The preparation of one selected polyhydroxyurethane material, obtained in the presence of Jeffamine® D-2010 was scaled-up to 43 g. The latter, when combined in a formulation using Irgacure® 2100 and Laromer® LR 9000 allowed the preparation of coatings that were analyzed with several techniques showing the potential of these biobased oligourethanes towards the preparation of commercially relevant materials.
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Affiliation(s)
- Cristina Maquilón
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | - Arianna Brandolese
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | | | | | - Francesco Della Monica
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
- Current affiliation: Dipartimento di Biotecnologie e Scienze della VitaUniversità degli Studi dell'InsubriaVia J. H. Dunant 321100VareseItaly
| | - Arjan W. Kleij
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
- Catalan Institute of Research and Advanced Studies (ICREA)Pg. Lluis Companys 2308010BarcelonaSpain
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4
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Pemberton MA, Kimber I. Methyl methacrylate and respiratory sensitisation: a comprehensive review. Crit Rev Toxicol 2022; 52:139-166. [PMID: 35607993 DOI: 10.1080/10408444.2022.2064267] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Methyl methacrylate (MMA) is classified under GHS as a weak skin sensitiser and a skin and respiratory irritant. It has recently been proposed that MMA be classified as a respiratory sensitiser (a designation that in a regulatory context embraces both true respiratory allergens, as well as chemicals that cause asthma through non-immunological mechanisms). This proposal was based primarily upon the interpretation of human data. This review, and a detailed weight of evidence analysis, has led to another interpretation of these data. The conclusion drawn is that persuasive evidence consistent with the designation of MMA as a respiratory sensitiser is lacking. It is suggested that one reason for different interpretations of these data is that occupational asthma poses several challenges with respect to establishing causation. Among these is that it is difficult to distinguish between allergic asthma, non-allergic asthma, and work-related exacerbation of pre-existing asthma. Moreover, there is a lack of methods for the identification of true chemical respiratory allergens. The characterisation and causation of occupational asthma is consequently largely dependent upon interpretation of human data of various types. Recommendations are made that are designed to improve the utility and interpretation of human data for establishing causation in occupational asthma.
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Affiliation(s)
| | - Ian Kimber
- Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
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5
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Amelioration of Ovalbumin-Induced Allergic Asthma by Juglans regia via Downregulation of Inflammatory Cytokines and Upregulation of Aquaporin-1 and Aquaporin-5 in Mice. J Trop Med 2022; 2022:6530095. [PMID: 35401757 PMCID: PMC8986429 DOI: 10.1155/2022/6530095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 02/22/2022] [Accepted: 03/10/2022] [Indexed: 11/17/2022] Open
Abstract
Juglans regia (J. regia) has been used traditionally to treat cough and asthma. The present study evaluates the immunomodulatory and anti-inflammatory potential of J. regia against ovalbumin (OVA)-induced allergic asthma. Intraperitoneal sensitization proceeded by intranasal challenge with OVA was used to induce allergic asthma. BALB/c mice were treated with methanol, n-hexane, and ethyl acetate extracts of J. regia and methylprednisolone one week after 2nd sensitization with OVA and continued for 7 days. mRNA expression levels of IL-4, IL-5, IL-13, AQP-1, AQP-5 TNF-α, TGF-β, and NF-kB were determined using reverse transcription polymerase chain reaction. Hematoxylin and eosin, and periodic acidic-Schiff stains were used for histopathological studies of lung tissues. The data presented all three extracts of J. regia significantly ameliorated airway inflammation by reducing expression levels of IL-4, IL-5, and IL-13 and TNF-α in OVA-treated mice. The suppression of goblet cells hyperplasia and inflammatory cells infiltration by J. regia involved low TGF-β and NF-kB levels. Pretreatment with J. regia also increased the AQP-1 and AQP-5 expression levels in mice treated with OVA. This study supported the traditional use of J. regia and proposed that J. regia ameliorated allergic asthma by suppression of proinflammatory cytokines and elevation of AQP-1 and AQP-5 expression levels.
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6
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Krahl PL, Mallon TM, Gaydos JC. Hazardous Non-Combat Exposures in the U.S. Department of Defense. Mil Med 2021; 187:314-318. [PMID: 35727733 DOI: 10.1093/milmed/usac166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 04/22/2022] [Accepted: 05/24/2022] [Indexed: 11/14/2022] Open
Abstract
Hazardous non-combat exposures are inherent to military service and occur in three settings: installation workplaces, installation environments, and deployment environments. Few military clinicians receive training in how to recognize, assess, and manage patients with these exposures, and systems improvements are needed to support clinicians with respect to exposure recognition and management. This commentary highlights key concepts surrounding military non-combat exposures by discussing three case examples of exposures occurring in each of these settings. In the workplace, well-coordinated, interdisciplinary occupational health teams improve identification of exposure-related illnesses, and these teams may be further supported by the development of automated clinical decision-support systems. Installation environmental exposures are characterized by high perceived risk, uncertainty in estimating actual risk, and a wide range of stakeholders including military family members and individuals in the surrounding community. Recognizing environmental exposure concerns, gathering a thorough environmental exposure history, and practicing exposure risk communication are vital skills to address these situations. During deployments, exposures may initially be perceived as low risk but then become a concern years later. A functional understanding of the capabilities and limitations of exposure monitoring and potential health effects of exposures helps the military clinician effectively communicate potential health risks to line leaders. For any of these exposure settings, service public health centers and OEM specialty leaders and consultants are available for consultation.
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Affiliation(s)
- Pamela L Krahl
- Department of Preventive Medicine and Biostatistics, F. Edward Hébert School of Medicine, Uniformed Services University, Bethesda, MD 20814, USA
| | - Timothy M Mallon
- Department of Preventive Medicine and Biostatistics, F. Edward Hébert School of Medicine, Uniformed Services University, Bethesda, MD 20814, USA
| | - Joel C Gaydos
- Department of Preventive Medicine and Biostatistics, F. Edward Hébert School of Medicine, Uniformed Services University, Bethesda, MD 20814, USA
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7
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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.
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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.
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8
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Deng Y, Chen S, Song S, Huang Y, Chen R, Tao A. Anti-DLL4 ameliorates toluene diisocyanate-induced experimental asthma by inhibiting Th17 response. Int Immunopharmacol 2021; 94:107444. [PMID: 33578263 DOI: 10.1016/j.intimp.2021.107444] [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: 10/10/2020] [Revised: 01/26/2021] [Accepted: 01/27/2021] [Indexed: 11/22/2022]
Abstract
Toluene diisocyanate (TDI) exhibits an ability to induce steroid insensitive asthma with the involvement of Th17 cells. And emerging evidence has indicated that DLL4 signaling promotes Th17 differentiation through directly upregulating Rorc and IL-17 transcription. Thus, we sought to evaluate the effects of DLL4 blocking antibody on TDI-induced asthma model. Female BALB/c mice were sensitized and challenged with TDI to generate an asthma model. TDI-exposed mice were intraperitoneally injected with anti-DLL4 antibody and then analyzed for various parameters of the airway inflammatory responses. Increased expression of DLL4 in spleen and lung was detected in TDI-exposed mice. Furthermore, anti-DLL4 treatment alleviated TDI-induced airway hyperreactivity (AHR), airway inflammation, airway epithelial injury and airway smooth muscle (ASM) thickening. In the meantime, neutralizing DLL4 also blunted Th17 response via downregulation of ROR-γt expression, while had no effect on Th2 cells and regulatory T (Treg) cells. Overall, anti-DLL4 ameliorated TDI-induced experimental asthma by inhibiting Th17 response, implying the feasibility of targeting DLL4 for therapy of Th17-predominant severe asthma.
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Affiliation(s)
- Yao Deng
- The Second Affiliated Hospital, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou 510260, China
| | - Shuyu Chen
- The Second Affiliated Hospital, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou 510260, China; Department of Pulmonary and Critical Care Medicine, Shenzhen Institute of Respiratory Diseases, The Second Clinical Medical College, Jinan University (Shenzhen People's Hospital), Shenzhen 518020, China; The First Affiliated Hospital, Jinan University, Guangzhou, China
| | - Shijie Song
- The Second Affiliated Hospital, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou 510260, China
| | - Yin Huang
- The Second Affiliated Hospital, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou 510260, China
| | - Rongchang Chen
- Department of Pulmonary and Critical Care Medicine, Shenzhen Institute of Respiratory Diseases, The Second Clinical Medical College, Jinan University (Shenzhen People's Hospital), Shenzhen 518020, China
| | - Ailin Tao
- The Second Affiliated Hospital, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou 510260, China.
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9
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Classification of chemicals as respiratory allergens based on human data: Requirements and practical considerations. Regul Toxicol Pharmacol 2021; 123:104925. [PMID: 33831493 DOI: 10.1016/j.yrtph.2021.104925] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 03/23/2021] [Accepted: 04/01/2021] [Indexed: 02/01/2023]
Abstract
Occupational asthma is an important health problem that can include exacerbation of existing asthma, or induce new asthma either through allergic sensitisation, or non-immunological mechanisms. While allergic sensitisation of the respiratory tract can be acquired to proteins, or to low molecular weight chemicals (chemical respiratory allergens) this article is on the latter exclusively. Chemical respiratory allergy resulting in occupational asthma is associated with high levels of morbidity and there is a need, therefore, that chemicals which can cause sensitisation of the respiratory tract are identified accurately. However, there are available no validated, or even widely accepted, predictive test methods (in vivo, in vitro or in silico) that have achieved regulatory acceptance for identifying respiratory sensitising hazards. For this reason there is an important reliance on human data for the identification of chemical respiratory allergens, and for distinguishing these from chemicals that cause occupational asthma through non-immunological mechanisms. In this article the reasons why it is important that care is taken in designating chemicals as respiratory allergens are reviewed. The value and limitations of human data that can aid the accurate identification of chemical respiratory allergens are explored, including exposure conditions, response characteristics in specific inhalation challenge tests, and immunological investigations.
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10
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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: 19] [Impact Index Per Article: 4.8] [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.
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Affiliation(s)
- Josje Arts
- Nouryon, Velperweg 76, 6824 BM Arnhem, the Netherlands.
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11
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Chen R, Zhang Q, Chen S, Tang H, Huang P, Wei S, Liang Z, Chen X, Tao A, Yao L. IL-17F, rather than IL-17A, underlies airway inflammation in a steroid-insensitive toluene diisocyanate-induced asthma model. Eur Respir J 2019; 53:13993003.01510-2018. [PMID: 30655284 DOI: 10.1183/13993003.01510-2018] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 01/06/2019] [Indexed: 12/20/2022]
Abstract
Steroid insensitivity constitutes a major problem for asthma management. Toluene diisocyanate (TDI) is one of the leading allergens of asthma that induces both T-helper Th2 and Th17 responses, and is often associated with poor responsiveness to steroid treatment in the clinic.We sought to evaluate the effects of inhaled and systemic steroids on a TDI-induced asthma model and to find how interleukin (IL)-17A and IL-17F function in this model. BALB/c mice were exposed to TDI for generating an asthma model and were treated with inhaled fluticasone propionate, systemic prednisone, anti-IL-17A, anti-IL-17F, recombinant IL-17A or IL-17F.Both fluticasone propionate and prednisone showed no effects on TDI-induced airway hyperresponsiveness (AHR), bronchial neutrophilia and eosinophilia, and epithelial goblet cell metaplasia. TDI-induced Th2 and Th17 signatures were not suppressed by fluticasone propionate or prednisone. Treatment with anti-IL-17A after TDI exposure led to increased AHR, aggravated mucus production and airway eosinophil recruitment, accompanied by amplified Th2 responses, whereas anti-IL-17F ameliorated TDI-induced AHR and airway neutrophilia, with decreased Th17 responses. Recombinant IL-17A and IL-17F showed opposite effects to the monoclonal antibodies.IL-17A and IL-17F exert distinct biological effects during airway inflammation of a TDI-induced asthma model, which is unresponsive to both inhaled and systemic steroids.
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Affiliation(s)
- Rongchang Chen
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China.,These authors contributed equally to this work
| | - Qingling Zhang
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China.,These authors contributed equally to this work
| | - Shuyu Chen
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China.,These authors contributed equally to this work
| | - Haixiong Tang
- Dept of Respiratory Medicine, Minzu Hospital of Guangxi Zhuang Autonomous Region, Guangxi Medical University, Nanning, China.,These authors contributed equally to this work
| | - Peikai Huang
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Shushan Wei
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Zhenyu Liang
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Xin Chen
- Dept of Respiratory Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Ailin Tao
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Lihong Yao
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
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12
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Fragrance inhalation and adverse health effects: The question of causation. Regul Toxicol Pharmacol 2019; 104:151-156. [PMID: 30904429 DOI: 10.1016/j.yrtph.2019.03.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Revised: 02/18/2019] [Accepted: 03/16/2019] [Indexed: 12/28/2022]
Abstract
The toxicology of fragrance materials is largely well understood. Although most are benign, a minority have the potential to cause adverse health effects, notably allergic contact dermatitis resulting from skin sensitization. As a consequence, industry guidelines have banned certain materials and strictly limited the use of others. Recently, data have been published that have been interpreted to suggest that inhalation of fragrances is associated with the occurrence of a variety of health effects, ranging from headaches to asthma attacks. In this review, the evidence basis for these assertions is examined critically and the biological basis and mechanistic plausibility for causation by fragranced products of these health effects is explored. This review concludes that respiratory effects, including irritation and allergy appear highly unlikely to occur by this route. While some sensory/psychosomatic effects are possible, this does not explain the very high rates of adverse effects reported in the recently published questionnaire studies, which this review concludes are more likely to be attributed to methodological weaknesses. Ultimately, it is concluded that adverse health effects arising from fragrance inhalation are uncommon and remain to be identified and confirmed by methodologically rigorous epidemiological investigations supported by a convincing biological and mechanistic basis.
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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.
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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
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Hamada H, Zimerson E, Bruze M, Isaksson M, Engfeldt M. Sensitizing Capacities and Cross-Reactivity Patterns of Some Diisocyanates and Amines Using the Guinea-Pig Maximization Test. Can p-phenylenediamine be Used as a Marker for Diisocyanate Contact Allergy? ACTA ACUST UNITED AC 2017. [DOI: 10.2174/1874372201711010087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:Isocyanates are mainly considered respiratory allergens but can also cause contact allergy. Diphenylmethane-4,4′-diamine (4,4′-MDA) has been considered a marker for diphenylmethane-4,4′-diisocyanate (4,4′-MDI) contact allergy. Furthermore, overrepresentation of positive patch-test reactions top-phenylenediamine (PPD) in 4,4′-MDA positive patients have been reported.Objectives:To investigate the sensitizing capacities of toluene-2,4-diisocyanate (2,4-TDI) and PPD and the cross-reactivity of 4,4′-MDA, 2,4-TDI, dicyclohexylmethane-4,4′-diamine (4,4′-DMDA), dicyclohexylmethane-4,4′-diisocyanate (4,4′-DMDI), 4,4′-MDI and PPD.Methods:The Guinea Pig Maximization Test (GPMT) was used.Results:PPD was shown to be a strong sensitizer (p<0.001). Animals sensitized to PPD showed cross-reactivity to 4,4′-MDA (p<0.001). Animals sensitized to 4,4′-MDA did not show cross-reactivity to PPD. 8 animals sensitized to 2,4-TDI were sacrificed due to toxic reactions at the induction site and could thus not be fully evaluated.Conclusion:PPD was shown to be a strong sensitizer. However, it cannot be used as a marker for isocyanate contact allergy. On the other hand, positive reactions to 4,4′-MDA could indicate a PPD allergy. The intradermal induction concentration of 2,4-TDI (0.70% w/v) can induce strong local toxic reactions in guinea-pigs and should be lowered.
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15
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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
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16
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Arts J, Kimber I. Azodicarbonamide (ADCA): A reconsideration of classification as a respiratory sensitiser. Regul Toxicol Pharmacol 2017; 89:268-278. [PMID: 28734852 DOI: 10.1016/j.yrtph.2017.07.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 06/30/2017] [Accepted: 07/19/2017] [Indexed: 12/18/2022]
Abstract
Azodicarbonamide (ADCA) is widely used by industry in the manufacture of a variety of products. ADCA has been classified as a respiratory allergen, and the purpose of this article was to consider whether this classification is appropriate based upon the available data. Here both clinical experience and relevant experimental data have been reviewed. Although there have been reports of an association between workplace exposure to ADCA and symptoms of respiratory allergy and occupational asthma, the evidence is less than persuasive, with in many instances a lack of properly controlled and executed diagnostic procedures. In addition, ADCA fails to elicit positive responses in mouse and guinea pig predictive tests for skin sensitisation; a lack of activity that is regarded as being inconsistent with respect to respiratory sensitising potential. Collectively, the data reviewed here do not provide an adequate basis for the classification of ADCA as a respiratory allergen.
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Affiliation(s)
- Josje Arts
- AkzoNobel NV, Velperweg 76, 6824 BM, Arnhem, The Netherlands.
| | - Ian Kimber
- Faculty of Biology, Medicine and Health, University of Manchester, Oxford Road, Manchester, M13 9PT, UK
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17
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Hamada H, Bruze M, Zimerson E, Isaksson M, Engfeldt M. Sensitization and cross-reactivity patterns of contact allergy to diisocyanates and corresponding amines: investigation of diphenylmethane-4,4'-diisocyanate, diphenylmethane-4,4'-diamine, dicyclohexylmethane-4,4'-diisocyanate, and dicylohexylmethane-4,4'-diamine. Contact Dermatitis 2017; 77:231-241. [PMID: 28555927 PMCID: PMC5599955 DOI: 10.1111/cod.12809] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 03/06/2017] [Accepted: 03/09/2017] [Indexed: 11/30/2022]
Abstract
Background Isocyanates are used in polyurethane production. Dermal exposure to isocyanates can induce contact allergy. The most common isocyanate is diphenylmethane diisocyanate used for industrial purposes. The isomer diphenylmethane‐4,4′‐diisocyanate (4,4′‐MDI) is used in patch testing. Diphenylmethane‐4,4′‐diamine (4,4′‐MDA) is its corresponding amine. Concurrent reactions to 4,4′‐MDI and 4,4′‐MDA have been reported, as have concurrent reactions to 4,4′‐MDI and dicyclohexylmethane‐4,4′‐diisocyanate (4,4′‐DMDI). Objectives To investigate the sensitization capacities and the cross‐reactivity of 4,4′‐MDI, 4,4′‐MDA, 4,4′‐DMDI, and dicyclohexylmethane‐4,4′‐diamine (4,4′‐DMDA). Methods The guinea‐pig maximization test (GPMT) was used. Results The GPMT showed sensitizing capacities for all investigated substances: 4,4′‐MDI, 4,4′‐MDA, 4,4′‐DMDI, and 4,4′‐DMDA (all p < 0.001). 4,4′‐MDI‐sensitized animals showed cross‐reactivity to 4,4′‐MDA (p < 0.001) and 4,4′‐DMDI (all p < 0.05). 4,4′‐MDA‐sensitized animals showed cross‐reactivity to 4,4′‐DMDA (p = 0.008). Conclusion All of the investigated substances were shown to be strong sensitizers. Animals sensitized to 4,4′‐MDI showed cross‐reactivity to 4,4′‐MDA and 4,4′‐DMDI, supporting previous findings in the literature. The aromatic amine 4,4′‐MDA showed cross‐reactivity to the aliphatic amine 4,4′‐DMDA.
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Affiliation(s)
- Haneen Hamada
- Lund University, Department of Occupational and Environmental Dermatology, Skåne University Hospital, 205 02, Malmö, Sweden
| | - Magnus Bruze
- Lund University, Department of Occupational and Environmental Dermatology, Skåne University Hospital, 205 02, Malmö, Sweden
| | - Erik Zimerson
- Lund University, Department of Occupational and Environmental Dermatology, Skåne University Hospital, 205 02, Malmö, Sweden
| | - Marléne Isaksson
- Lund University, Department of Occupational and Environmental Dermatology, Skåne University Hospital, 205 02, Malmö, Sweden
| | - Malin Engfeldt
- Lund University, Department of Occupational and Environmental Dermatology, Skåne University Hospital, 205 02, Malmö, Sweden
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18
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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.
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19
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Muti AD, Pârvu AE, Muti LA, Moldovan R, Mureşan A. Vitamin E effect in a rat model of toluene diisocyanate-induced asthma. ACTA ACUST UNITED AC 2016; 89:499-505. [PMID: 27857519 PMCID: PMC5111490 DOI: 10.15386/cjmed-611] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 01/02/2016] [Accepted: 01/06/2016] [Indexed: 12/11/2022]
Abstract
Background and aim The aim of the study was to evaluate vitamin E effect upon oxidative stress associated with toluene −2, 4-diisocyanate (TDI)-induced asthma in rats. Methods The five study groups were: control, vehicle, TDI, vehicle+E, TDI+E. TDI animals were sensitized by nasal administration of TDI 10% (5μl/nostril) between days 1–7 and 15–21. Between days 22–28 groups TDI+E and vehicle+E rats received vitamin E (50 mg/kg, i. v.), and control, vehicle and TDI groups received saline solution. On day 29 the rats were challenged by intranasal application of 5% TDI (5 μl/nostril). On day 30 blood, BALF and lung biopsy were harvested. Oxidative stress tests were malondialdehyde (MDA), protein carbonyls (PC), total thiols (tSH), 1,1-diphenyl-2-picryl hydrazyl (DPPH) and reduced glutathione (GSH). Results TDI sensitization increased oxidative stress systemically, but also locally in the respiratory airways and lung tissue. There was an increase of MDA and PC formation associated with a deficiency of the antioxidant defense reflected by DPPH decreases. There were no differences between systemic and local lung concentrations of oxidized molecules. After vitamin E treatment oxidative stress was reduced mostly due to serum, BALF and lung tissue GSH and DPPH increase. Conclusion The study showed that in rat TDI-induced asthma there was oxidative stress caused by increased ROS production and antioxidants deficiency, and vitamin E reduced ROS production and improved antioxidant defense.
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Affiliation(s)
- Andrea Daniela Muti
- Pulmonology and Allergy Department, CHU Gabriel Montpied Clermont-Ferrand, France; Immunology and Allergy Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Alina Elena Pârvu
- Pathophysiology Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Leon Adrian Muti
- Digestive Medicine Department, CHU Estaing, Clermont-Ferrand, France
| | - Remus Moldovan
- Physiology Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Adriana Mureşan
- Physiology Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
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20
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Devos FC, Boonen B, Alpizar YA, Maes T, Hox V, Seys S, Pollaris L, Liston A, Nemery B, Talavera K, Hoet PHM, Vanoirbeek JAJ. Neuro-immune interactions in chemical-induced airway hyperreactivity. Eur Respir J 2016; 48:380-92. [PMID: 27126687 DOI: 10.1183/13993003.01778-2015] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 03/02/2016] [Indexed: 01/07/2023]
Abstract
Asthma may be induced by chemical sensitisers, via mechanisms that are still poorly understood. This type of asthma is characterised by airway hyperreactivity (AHR) and little airway inflammation. Since potent chemical sensitisers, such as toluene-2,4-diisocyanate (TDI), are also sensory irritants, it is suggested that chemical-induced asthma relies on neuro-immune mechanisms.We investigated the involvement of transient receptor potential channels (TRP) A1 and V1, major chemosensors in the airways, and mast cells, known for their ability to communicate with sensory nerves, in chemical-induced AHR.In vitro intracellular calcium imaging and patch-clamp recordings in TRPA1- and TRPV1-expressing Chinese hamster ovarian cells showed that TDI activates murine TRPA1, but not TRPV1. Using an in vivo model, in which an airway challenge with TDI induces AHR in TDI-sensitised C57Bl/6 mice, we demonstrated that AHR does not develop, despite successful sensitisation, in Trpa1 and Trpv1 knockout mice, and wild-type mice pretreated with a TRPA1 blocker or a substance P receptor antagonist. TDI-induced AHR was also abolished in mast cell deficient Kit(Wsh) (/Wsh) mice, and in wild-type mice pretreated with the mast cell stabiliser ketotifen, without changes in immunological parameters.These data demonstrate that TRPA1, TRPV1 and mast cells play an indispensable role in the development of TDI-elicited AHR.
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Affiliation(s)
- Fien C Devos
- Centre for Environment and Health, Dept of Public Health and Primary Care, KU Leuven, Leuven, Belgium
| | - Brett Boonen
- Laboratory for Ion Channel Research and TRP Research Platform (TRPLe), Dept of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Yeranddy A Alpizar
- Laboratory for Ion Channel Research and TRP Research Platform (TRPLe), Dept of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Tania Maes
- Laboratory of Pneumology, Dept of Respiratory Medicine, Ghent University, Ghent, Belgium
| | - Valérie Hox
- Laboratory of Clinical Immunology, Dept of Microbiology and Immunology, KU Leuven, Leuven, Belgium
| | - Sven Seys
- Laboratory of Clinical Immunology, Dept of Microbiology and Immunology, KU Leuven, Leuven, Belgium
| | - Lore Pollaris
- Centre for Environment and Health, Dept of Public Health and Primary Care, KU Leuven, Leuven, Belgium
| | - Adrian Liston
- Laboratory of Genetics of Autoimmunity, Dept of Microbiology and Immunology, KU Leuven, Leuven, Belgium
| | - Benoit Nemery
- Centre for Environment and Health, Dept of Public Health and Primary Care, KU Leuven, Leuven, Belgium
| | - Karel Talavera
- Laboratory for Ion Channel Research and TRP Research Platform (TRPLe), Dept of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Peter H M Hoet
- Centre for Environment and Health, Dept of Public Health and Primary Care, KU Leuven, Leuven, Belgium
| | - Jeroen A J Vanoirbeek
- Centre for Environment and Health, Dept of Public Health and Primary Care, KU Leuven, Leuven, Belgium
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Fragrance sensitisers: Is inhalation an allergy risk? Regul Toxicol Pharmacol 2015; 73:897-902. [DOI: 10.1016/j.yrtph.2015.09.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 09/28/2015] [Indexed: 12/20/2022]
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22
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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: 12] [Impact Index Per Article: 1.3] [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.
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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
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de Boer J, Fritsche E, Schoeters G, Kimber I. The European Long-range Research Initiative (LRI): A decade of contributions to human health protection, exposure modelling and environmental integrity. Toxicology 2015; 337:83-90. [PMID: 26388043 DOI: 10.1016/j.tox.2015.09.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Revised: 09/13/2015] [Accepted: 09/14/2015] [Indexed: 10/23/2022]
Abstract
The European Long-range Research Initiative (LRI) was launched in 2000. The objective of this programme is to provide increased understanding of the potential impact of chemicals on human health and the environment. The aim has been to reduce uncertainty associated with innovation, and to promote evidence-based decision making. In pursuing these objectives the LRI has commissioned independent scientific research in institutions throughout Europe and beyond. The portfolio of research supported by the LRI has delivered significant contributions to risk assessment sciences. In addition, the LRI programme has benefited the broader scientific community. In this review article members of the Cefic European Scientific Advisory Panel (ESAP), the body charged with providing oversight of the LRI programme, illustrate some of those achievements by reference to specific areas of research (respiratory allergy, human biomonitoring, environment and wildlife), and also the contribution made to the development of European scientists through the annual LRI Award Programme.
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Affiliation(s)
- Jacob de Boer
- VU University, Institute for Environmental Studies, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands.
| | - Ellen Fritsche
- IUF-Leibniz Research Institute for Environmental Medicine, Auf'm Hennekamp 50, 40225 Düsseldorf, Germany
| | - Greet Schoeters
- VITO Unit for Environmental Risk and Health, Boeretang 200, 2400 Mol, Belgium
| | - Ian Kimber
- University of Manchester, Faculty of Life Sciences, Manchester M13 9PT, United Kingdom
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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: 33] [Impact Index Per Article: 3.7] [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.
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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
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