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Gu X, Li Z, Su J. Air pollution and skin diseases: A comprehensive evaluation of the associated mechanism. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 278:116429. [PMID: 38718731 DOI: 10.1016/j.ecoenv.2024.116429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 04/28/2024] [Accepted: 05/03/2024] [Indexed: 05/26/2024]
Abstract
Air pollutants deteriorate the survival environment and endanger human health around the world. A large number of studies have confirmed that air pollution jeopardizes multiple organs, such as the cardiovascular, respiratory, and central nervous systems. Skin is the largest organ and the first barrier that protects us from the outside world. Air pollutants such as particulate matter (PM), polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs) will affect the structure and function of the skin and bring about the development of inflammatory skin diseases (atopic dermatitis (AD), psoriasis), skin accessory diseases (acne, alopecia), auto-immune skin diseases (cutaneous lupus erythematosus(CLE) scleroderma), and even skin tumors (melanoma, basal cell carcinoma (BCC), squamous-cell carcinoma (SCC)). Oxidative stress, skin barrier damage, microbiome dysbiosis, and skin inflammation are the pathogenesis of air pollution stimulation. In this review, we summarize the current evidence on the effects of air pollution on skin diseases and possible mechanisms to provide strategies for future research.
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Affiliation(s)
- Xiaoyu Gu
- Department of Dermatology | Hunan Engineering Research Center of Skin Health and Disease | Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Hospital, Central South University, Changsha 410008, China; National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Changsha 410008, China; National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Changsha 410008, China; Furong Laboratory, Changsha, Hunan 410008, China
| | - Zhengrui Li
- XiangYa School of Medicine, Central South University, Changsha 410008, China
| | - Juan Su
- Department of Dermatology | Hunan Engineering Research Center of Skin Health and Disease | Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Hospital, Central South University, Changsha 410008, China; National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Changsha 410008, China; National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Changsha 410008, China; Furong Laboratory, Changsha, Hunan 410008, China.
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2
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Wang SP, Stefanovic N, Orfali RL, Aoki V, Brown SJ, Dhar S, Eichenfield LF, Flohr C, Ha A, Mora C, Murase JE, Rosenbach M, Srinivas SM, Thyssen JP, Wei ML, Irvine AD, Abuabara K. Impact of climate change on atopic dermatitis: A review by the International Eczema Council. Allergy 2024; 79:1455-1469. [PMID: 38265114 DOI: 10.1111/all.16007] [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: 10/19/2023] [Revised: 12/04/2023] [Accepted: 12/19/2023] [Indexed: 01/25/2024]
Abstract
Atopic dermatitis (AD), the most burdensome skin condition worldwide, is influenced by climatic factors and air pollution; however, the impact of increasing climatic hazards on AD remains poorly characterized. Leveraging an existing framework for 10 climatic hazards related to greenhouse gas emissions, we identified 18 studies with evidence for an impact on AD through a systematic search. Most climatic hazards had evidence for aggravation of AD the impact ranged from direct effects like particulate matter-induced AD exacerbations from wildfires to the potential for indirect effects like drought-induced food insecurity and migration. We then created maps comparing the past, present, and future projected burden of climatic hazards to global AD prevalence data. Data are lacking, especially from those regions most likely to experience more climatic hazards. We highlight gaps important for future research: understanding the synergistic impacts of climatic hazards on AD, long-term disease activity, the differential impact on vulnerable populations, and how basic mechanisms explain population-level trends.
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Affiliation(s)
- Sheng-Pei Wang
- Department of Dermatology, University of California San Francisco, San Francisco, California, USA
| | | | - Raquel L Orfali
- Department of Dermatology, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Valeria Aoki
- Department of Dermatology, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Sara J Brown
- Centre for Genomic & Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, UK
| | - Sandipan Dhar
- Department of Pediatric Dermatology, Institute of Child Health, Kolkata, India
| | - Lawrence F Eichenfield
- Departments of Dermatology and Pediatrics, University of California San Diego, San Diego, California, USA
| | - Carsten Flohr
- Unit for Population-Based Dermatology Research, St John's Institute of Dermatology, Guy's & St Thomas' NHS Foundation Trust and King's College London, London, UK
| | - Alex Ha
- Department of Dermatology, University of California San Francisco, San Francisco, California, USA
| | - Camilo Mora
- Department of Geography and Environment, University of Hawai'i at Mānoa, Honolulu, Hawai'i, USA
| | - Jenny E Murase
- Department of Dermatology, University of California San Francisco, San Francisco, California, USA
- Department of Dermatology, Palo Alto Foundation Medical Group, Mountain View, California, USA
| | - Misha Rosenbach
- Department of Dermatology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Sahana M Srinivas
- Department of Dermatology, Indira Gandhi Institute of Child Health, Bengaluru, India
| | - Jacob P Thyssen
- Department of Dermatology and Venereology, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Maria L Wei
- Department of Dermatology, University of California San Francisco, San Francisco, California, USA
- Dermatology Service, San Francisco VA Health Care System, San Francisco, California, USA
| | - Alan D Irvine
- Clinical Medicine, Trinity College Dublin, Dublin, Ireland
| | - Katrina Abuabara
- Department of Dermatology, University of California San Francisco, San Francisco, California, USA
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3
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Liang H, Wang Y, Liu F, Duan G, Long J, Jin Y, Chen S, Yang H. The Application of Rat Models in Staphylococcus aureus Infections. Pathogens 2024; 13:434. [PMID: 38921732 PMCID: PMC11206676 DOI: 10.3390/pathogens13060434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 05/10/2024] [Accepted: 05/20/2024] [Indexed: 06/27/2024] Open
Abstract
Staphylococcus aureus (S. aureus) is a major human pathogen and can cause a wide range of diseases, including pneumonia, osteomyelitis, skin and soft tissue infections (SSTIs), endocarditis, mastitis, bacteremia, and so forth. Rats have been widely used in the field of infectious diseases due to their unique advantages, and the models of S. aureus infections have played a pivotal role in elucidating their pathogenic mechanisms and the effectiveness of therapeutic agents. This review outlined the current application of rat models in S. aureus infections and future prospects for rat models in infectious diseases caused by S. aureus.
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Affiliation(s)
- Hongyue Liang
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou 450001, China; (H.L.); (F.L.); (G.D.); (J.L.); (Y.J.); (S.C.)
| | - Yadong Wang
- Department of Toxicology, Henan Center for Disease Control and Prevention, Zhengzhou 450016, China;
| | - Fang Liu
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou 450001, China; (H.L.); (F.L.); (G.D.); (J.L.); (Y.J.); (S.C.)
| | - Guangcai Duan
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou 450001, China; (H.L.); (F.L.); (G.D.); (J.L.); (Y.J.); (S.C.)
| | - Jinzhao Long
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou 450001, China; (H.L.); (F.L.); (G.D.); (J.L.); (Y.J.); (S.C.)
| | - Yuefei Jin
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou 450001, China; (H.L.); (F.L.); (G.D.); (J.L.); (Y.J.); (S.C.)
| | - Shuaiyin Chen
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou 450001, China; (H.L.); (F.L.); (G.D.); (J.L.); (Y.J.); (S.C.)
| | - Haiyan Yang
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou 450001, China; (H.L.); (F.L.); (G.D.); (J.L.); (Y.J.); (S.C.)
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Sultana R, Parveen A, Kang MC, Hong SM, Kim SY. Glyoxal-derived advanced glycation end products (GO-AGEs) with UVB critically induce skin inflammaging: in vitro and in silico approaches. Sci Rep 2024; 14:1843. [PMID: 38246969 PMCID: PMC10800344 DOI: 10.1038/s41598-024-52037-z] [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: 10/12/2023] [Accepted: 01/12/2024] [Indexed: 01/23/2024] Open
Abstract
Advanced glycation end products (AGEs) have potential implications on several diseases including skin inflammation and aging. AGEs formation can be triggered by several factors such as UVB, glyoxal and methylglyoxal etc. However, little attention has been paid to glyoxal-derived AGEs (GO-AGEs) and UVB-induced skin inflammaging, with none have investigated together. This study aimed to investigate the possible role of GO-AGEs and UVB in skin inflammaging focusing on revealing its molecular mechanisms. The effects of GO-AGEs in the presence or absence of UVB were studied by using enzyme linked immunosorbent assay, western blotting, qPCR, flow cytometry and in silico approaches. In HaCaT cells, GO-AGEs in the presence of UVB irradiation (125 mJ/cm2) dramatically enhanced the release of different pro-inflammatory cytokines (IL-1β, IL-6, and TNF-α) with further activation of RAGE signaling pathways (NF-κB, COX 2, and IL- 1β) and increased oxidative stress also noticed in NHEK cells. In NHDF cells, extracellular matrix disruption noted via increasing matrix metalloproteinase release and decreasing collagen type 1 and SIRT1 expression. Besides that, the docking scores obtained from the molecular docking study support the above-mentioned results. This study strongly suggests the pivotal role of GO-AGEs in skin inflammaging and illuminates novel molecular pathways for searching most effective and updated anti-aging therapy.
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Affiliation(s)
- Razia Sultana
- Department of Pharmacy, Jagannath University, Dhaka, 1100, Bangladesh
- Department of Life Science, University of Seoul, Seoul, 02504, Korea
| | - Amna Parveen
- College of Pharmacy, Gachon University, #191, Hambakmoero, Yeonsu-gu, Incheon, 21936, Korea
| | - Min-Cheol Kang
- MetaCen Therapeutics Company, # Changnyong-daero 256 beon-gil, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16229, Republic of Korea
| | - Seong-Min Hong
- College of Pharmacy, Gachon University, #191, Hambakmoero, Yeonsu-gu, Incheon, 21936, Korea
| | - Sun Yeou Kim
- College of Pharmacy, Gachon University, #191, Hambakmoero, Yeonsu-gu, Incheon, 21936, Korea.
- Gachon Institute of Pharmaceutical Science, Gachon University, #191, Hambakmoe-ro, Yeonsu-gu, Incheon, 21936, Republic of Korea.
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Inhibition of Mast Cell Degranulation in Atopic Dermatitis by Celastrol through Suppressing MRGPRX2. DISEASE MARKERS 2023; 2023:9049256. [PMID: 36712922 PMCID: PMC9876689 DOI: 10.1155/2023/9049256] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 01/05/2023] [Accepted: 01/05/2023] [Indexed: 01/19/2023]
Abstract
Background Atopic dermatitis is a common dermatological disease, and mast cell degranulation is believed to be related with the progression of atopic dermatitis. Mas-related G protein-coupled receptor-X2 (MRGPRX2), and calcium release-activated calcium channel protein 1-2 (ORAI-1, ORAI-2) are involved in mast cell degranulation. Celastrol is an active monomer of Tripterygium wilfordii, and it presents an antiatopic role. Methods 2,4-Dinitrofluorobenzene (DNFB) and compound 48/80 (C 48/80) were used to establish a slow and acute scratching animal model, respectively. Hematoxylin-eosin and toluidine blue staining was used to investigate tissue injury. Inflammatory factor concentration was measured with ELISA. The expression of MRGPRX2, ORAI-1, and ORAI-2 was detected with immunohistochemistry (IHC) staining. Gene expression profiling and microRNA array were performed to investigate gene differential expression. Results Celastrol greatly inhibited atopic dermatitis-related tissues injury, mast cell production, histamine release, scratching level, inflammatory factor expression, and activation of MRGPRX2/ORAI axis in the DNFB-induced atopic dermatitis model. The influence of Celastrol on atopic dermatitis was remarkably reversed by overexpression of MRGPRX2. Conclusion We found that the improvements of atopic dermatitis caused by Celastrol were reversed by treatment with MRGPRX2OE, indicating that Celastrol might affect atopic dermatitis through MRGPRX2. This study might provide a novel thought for the prevention and treatment of atopic dermatitis by regulating MRGPRX2.
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Lee J, Park L, Kim H, Rho BI, Han RT, Kim S, Kim HJ, Na HS, Back SK. Adipose-derived stem cells decolonize skin Staphylococcus aureus by enhancing phagocytic activity of peripheral blood mononuclear cells in the atopic rats. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY 2022; 26:287-295. [PMID: 35766006 PMCID: PMC9247705 DOI: 10.4196/kjpp.2022.26.4.287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/16/2022] [Accepted: 06/16/2022] [Indexed: 11/15/2022]
Abstract
Staphylococcus aureus (S. aureus) is known to induce apoptosis of host immune cells and impair phagocytic clearance, thereby being pivotal in the pathogenesis of atopic dermatitis (AD). Adipose-derived stem cells (ASCs) exert therapeutic effects against inflammatory and immune diseases. In the present study, we investigated whether systemic administration of ASCs restores the phagocytic activity of peripheral blood mononuclear cells (PBMCs) and decolonizes cutaneous S. aureus under AD conditions. AD was induced by injecting capsaicin into neonatal rat pups. ASCs were extracted from the subcutaneous adipose tissues of naïve rats and administered to AD rats once a week for a month. Systemic administration of ASCs ameliorated AD-like symptoms, such as dermatitis scores, serum IgE, IFN-γ+/IL-4+ cell ratio, and skin colonization by S. aureus in AD rats. Increased FasL mRNA and annexin V+/7-AAD+ cells in the PBMCs obtained from AD rats were drastically reversed when co-cultured with ASCs. In contrast, both PBMCs and CD163+ cells bearing fluorescent zymosan particles significantly increased in AD rats treated with ASCs. Additionally, the administration of ASCs led to an increase in the mRNA levels of antimicrobial peptides, such as cathelicidin and β-defensin, in the skin of AD rats. Our results demonstrate that systemic administration of ASCs led to decolonization of S. aureus by attenuating apoptosis of immune cells in addition to restoring phagocytic activity. This contributes to the improvement of skin conditions in AD rats. Therefore, administration of ASCs may be helpful in the treatment of patients with intractable AD.
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Affiliation(s)
- Jaehee Lee
- Neuroscience Research Institute and Department of Physiology, Korea University College of Medicine, Seoul 02841, Korea
| | | | - Hyeyoung Kim
- Neuroscience Research Institute and Department of Physiology, Korea University College of Medicine, Seoul 02841, Korea
| | | | - Rafael Taeho Han
- Neuroscience Research Institute and Department of Physiology, Korea University College of Medicine, Seoul 02841, Korea
| | - Sewon Kim
- Department of Microbiology, Korea University College of Medicine, Seoul 02841, Korea
| | - Hee Jin Kim
- Division of Biological Science and Technology, Science and Technology College, Yonsei University Mirae Campus, Wonju 26493, Korea
| | - Heung Sik Na
- Neuroscience Research Institute and Department of Physiology, Korea University College of Medicine, Seoul 02841, Korea
| | - Seung Keun Back
- Department of Biomedical Laboratory Science, College of Medical Science, Konyang University, Daejeon 35365, Korea
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Park TH, Park S, Cho MK, Kim S. Associations of particulate matter with atopic dermatitis and chronic inflammatory skin diseases in South Korea. Clin Exp Dermatol 2021; 47:325-334. [PMID: 34426985 DOI: 10.1111/ced.14910] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/18/2021] [Accepted: 08/19/2021] [Indexed: 01/18/2023]
Abstract
BACKGROUND Particulate matter (PM) is a mixture of solid and liquid particles suspended in air, which originates from industrial plants or vehicle emissions. Although the skin is the primary body area of contact with air pollutants, the associations between PM and chronic inflammatory skin diseases has not been well established. AIM To investigate associations between PM and atopic dermatitis (AD) and between PM and other chronic inflammatory dermatoses, using data from the Korean Health Insurance Review and Assessment Service. METHODS Monthly disease statistics from the seven largest cities in South Korea (Seoul, Busan, Daegu, Incheon, Gwangju, Daejeon, Ulsan) and from Jeju Island (in total, a population of 23 288 000 for all eight areas) were included. Based on daily air pollution level and weather forecast from 2015 to 2019, multivariate negative binomial regression analysis was conducted to estimate monthly visits of AD with respect to outdoor air pollutants: coarse PM with a diameter of ≤ 10 μm (PM10) and fine PM with a diameter of ≤ 2.5 μm (PM2.5) ozone (O3 ), nitrogen dioxide (NO2 ), sulphur dioxide (SO2 ) and carbon monoxide (CO). RESULTS Increases in the levels of PM2.5, PM10, SO2 and CO were associated with significant increases in monthly patient visits for AD. Every 10 μg/m3 increase in PM2.5 and PM10 resulted in patient visit increases of 2.71% (95% CI 0.76-4.71; P < 0.01) and 2.01% (95% CI 0.92-3.11, P < 0.001), respectively, while every 1 part per billion (ppb) increase in SO2 and every 100 ppb increase in CO resulted in visit increases of 2.26% (95% CI 1.35-3.17; P < 0.001) and 2.86% (95% CI 1.35-4.40; P < 0.001), respectively. O3 and NO2 were not associated with increased patient visits for AD. Increases in PM2.5 and PM10 concentrations were also significantly associated with increases in patient visits for psoriasis, seborrhoeic dermatitis and rosacea. CONCLUSION Our data suggest that PM is associated with AD and other chronic inflammatory skin diseases.
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Affiliation(s)
- T H Park
- Department of Dermatology, Soonchunhyang University Hospital, Seoul, South Korea
| | - S Park
- Department of Biostatistics, Soonchunhyang University Hospital, Seoul, South Korea
| | - M K Cho
- Department of Dermatology, Soonchunhyang University Hospital, Seoul, South Korea
| | - S Kim
- Department of Dermatology, Soonchunhyang University Hospital, Seoul, South Korea
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Kim HS, Hashimoto T, Fischer K, Bernigaud C, Chosidow O, Yosipovitch G. Scabies itch: an update on neuroimmune interactions and novel targets. J Eur Acad Dermatol Venereol 2021; 35:1765-1776. [PMID: 33960033 DOI: 10.1111/jdv.17334] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 04/23/2021] [Indexed: 12/14/2022]
Abstract
Frequently described as 'the worst itch' one can ever experience scabies itch is the hallmark of Sarcoptes scabiei mite infestation. Notably, the itchiness often persists for weeks despite scabicides therapy. The mechanism of scabies itch is not yet fully understood, and effective treatment modalities are still missing which can severely affect the quality of life. The aim of this review is to provide an overview of the scope of itch in scabies and highlight candidate mechanisms underlying this itch. We herein discuss scabies itch, with a focus on the nature, candidate underlying mechanisms and treatment options. We also synthesize this information with current understanding of the mechanisms contributing to non-histaminergic itch in other conditions. Itch is a major problem in scabies and can lead to grave consequences. We provide the latest insights on host-mite interaction, secondary microbial infection and neural sensitization with special emphasis on keratinocytes and mast cells to better understand the mechanism of itch in scabies. Also, the most relevant current modalities remaining under investigation that possess promising perspectives for scabies itch (i.e. protease-activated receptor-2 (PAR-2) inhibitor, Mas-related G protein-coupled receptor X2 (MRGPRX2) antagonist) are discussed. Greater understanding of these diverse mechanisms may provide a rational basis for the development of improved and targeted approaches to control itch in individuals with scabies.
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Affiliation(s)
- H S Kim
- Dr Philip Frost Department of Dermatology and Cutaneous Surgery, Miami Itch Center, Miller School of Medicine, University of Miami, Miami, FL, USA.,Department of Dermatology, Incheon St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
| | - T Hashimoto
- Department of Dermatology, National Defense Medical College, Saitama, Japan
| | - K Fischer
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - C Bernigaud
- Faculté de Santé de Créteil et Service de Dermatologie, APHP, Hôpital Henri-Mondor, Université Paris-Est, Créteil, France.,Research Group Dynamic, EA7380, Faculté de Santé de Créteil, Ecole Nationale Vétérinaire d'Alfort, USC ANSES, Université Paris-Est Créteil, Créteil, France
| | - O Chosidow
- Faculté de Santé de Créteil et Service de Dermatologie, APHP, Hôpital Henri-Mondor, Université Paris-Est, Créteil, France.,Research Group Dynamic, EA7380, Faculté de Santé de Créteil, Ecole Nationale Vétérinaire d'Alfort, USC ANSES, Université Paris-Est Créteil, Créteil, France
| | - G Yosipovitch
- Dr Philip Frost Department of Dermatology and Cutaneous Surgery, Miami Itch Center, Miller School of Medicine, University of Miami, Miami, FL, USA
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Stefanovic N, Irvine AD, Flohr C. The Role of the Environment and Exposome in Atopic Dermatitis. CURRENT TREATMENT OPTIONS IN ALLERGY 2021; 8:222-241. [PMID: 34055570 PMCID: PMC8139547 DOI: 10.1007/s40521-021-00289-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/16/2021] [Indexed: 12/23/2022]
Abstract
Purpose of review Atopic dermatitis (AD) is a chronic inflammatory skin disorder affecting up to 20% of children and up to 5% of adults worldwide, contributing to significant disease-related morbidity in this patient cohort. Its aetiopathogenesis is underpinned by multiple factors, including genetic susceptibility, skin barrier defects, a skewed cutaneous immune response and microbiome perturbation in both the skin and the gut. In this review, we aim to examine the biological effects of key environmental exposures (the sum of which is termed the “exposome”) at the population, community and individual levels in order to describe their effect on AD pathogenesis. Recent findings It is now understood that as well as considering the type of environmental exposure with regard to its effect on AD pathogenesis, the dosage and timing of the exposure are both critical domains that may lead to either exacerbation or amelioration of disease. In this review, we consider the effects of population-wide exposures such as climate change, migration and urbanization; community-specific exposures such as air pollution, water hardness and allergic sensitisation; and individual factors such as diet, microbiome alteration, psychosocial stress and the impact of topical and systemic therapy. Summary This review summarises the interaction of the above environmental factors with the other domains of AD pathogenesis, namely, the inherent genetic defects, the skin barrier, the immune system and the cutaneous and gut microbiota. We specifically emphasise the timing and dosage of exposures and its effect on the cellular and molecular pathways implicated in AD.
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Affiliation(s)
| | - Alan D Irvine
- Department of Paediatric Dermatology, Children's Health Ireland at Crumlin, Dublin, Ireland.,National Children's Research Centre, Crumlin and Clinical Medicine, Trinity College Dublin, Dublin, Ireland
| | - Carsten Flohr
- Unit for Population-Based Dermatology Research, St John's Institute of Dermatology, Guy's & St Thomas' NHS Foundation Trust and King's College London, London, UK
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10
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Hendricks AJ, Eichenfield LF, Shi VY. The impact of airborne pollution on atopic dermatitis: a literature review. Br J Dermatol 2020; 183:16-23. [PMID: 31794065 DOI: 10.1111/bjd.18781] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/02/2019] [Indexed: 12/16/2022]
Abstract
The increasing prevalence of atopic dermatitis (AD) parallels a global rise in industrialization and urban living over recent decades. This shift in lifestyle is accompanied by greater cutaneous exposure to environmental pollutants during the course of daily activities. The objectives of this review are to highlight the effects of airborne pollution on epidermal barrier function, examine evidence on the relationship between pollutants and AD, synthesize a proposed mechanism for pollution-induced exacerbation of AD, and identify potential methods for the reduction and prevention of pollutant-induced skin damage. The literature review was done by searching the PubMed, Embase and Google Scholar databases. Inclusion criteria were in vitro and animal studies, clinical trials and case series. Non-English-language publications, review articles and case reports were excluded. Pollutants induce cutaneous oxidative stress and have been shown to damage skin barrier integrity by altering transepidermal water loss, inflammatory signalling, stratum corneum pH and the skin microbiome. AD represents a state of inherent barrier dysfunction, and both long- and short-term pollutant exposure have been linked to exacerbation of AD symptoms and increased AD rates in population studies. Airborne pollutants have a detrimental effect on skin barrier integrity and AD symptoms, and appear to pose a multifaceted threat in AD through several parallel mechanisms, including oxidative damage, barrier dysfunction, immune stimulation and propagation of the itch-scratch cycle. Future research is needed to elucidate specific mechanisms of pollution-induced epidermal barrier dysfunction and to identify efficacious methods of skin barrier repair and protection against pollutant-driven damage.
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Affiliation(s)
- A J Hendricks
- University of Arizona College of Medicine, Tucson, AZ, U.S.A
| | - L F Eichenfield
- Departments of Dermatology and Pediatrics, University of California San Diego, San Diego, CA, U.S.A.,Rady Children's Hospital Department of Pediatric and Adolescent Dermatology, San Diego, CA, U.S.A
| | - V Y Shi
- University of Arizona Department of Medicine, Division of Dermatology, Tucson, AZ, U.S.A
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