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da Silva Duarte AJ, Sanabani SS. Deciphering epigenetic regulations in the inflammatory pathways of atopic dermatitis. Life Sci 2024; 348:122713. [PMID: 38735367 DOI: 10.1016/j.lfs.2024.122713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/29/2024] [Accepted: 05/09/2024] [Indexed: 05/14/2024]
Abstract
Atopic dermatitis, commonly referred to as atopic eczema, is a persistent inflammatory skin disorder that predominantly manifests in children but may endure into adulthood. Its clinical management poses challenges due to the absence of a definitive cure, and its prevalence varies across ethnicities, genders, and geographic locations. The epigenetic landscape of AD includes changes in DNA methylation, changes in histone acetylation and methylation, and regulation by non-coding RNAs. These changes affect inflammatory and immune mechanisms, and research has identified AD-specific variations in DNA methylation, particularly in the affected epidermis. Histone modifications, including acetylation, have been associated with the disruption of skin barrier function in AD, suggesting the potential therapeutic benefit of histone deacetylase inhibitors such as belinostat. Furthermore, non-coding RNAs, particularly microRNAs and long non-coding RNAs (lncRNAs), have been implicated in modulating various cellular processes central to AD pathogenesis. Therapeutic implications in AD include the potential use of DNA methylation inhibitors and histone deacetylase inhibitors to correct aberrant methylation patterns and modulate gene expression related to immune responses and skin barrier functions. Additionally, the emerging role of lncRNAs suggests the possibility of using small interfering RNAs or antisense oligonucleotides to inhibit lncRNAs and adjust their regulatory impact on gene expression. In conclusion, the importance of epigenetic elements in AD is becoming increasingly clear as studies highlight the contribution of DNA methylation, histone modifications and, control by non-coding RNAs to the onset and progression of the disease. Understanding these epigenetic changes provides valuable insights for developing targeted therapeutic strategies.
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Affiliation(s)
- Alberto José da Silva Duarte
- Laboratory of Medical Investigation LIM-56, Division of Dermatology, Medical School, University of São Paulo, São Paulo 05403-000, Brazil
| | - Sabri Saeed Sanabani
- Laboratory of Medical Investigation LIM-56, Division of Dermatology, Medical School, University of São Paulo, São Paulo 05403-000, Brazil; Laboratory of Medical Investigation Unit 03, Clinics Hospital, Faculty of Medicine, University of Sao Paulo, Sao Paulo 05403-000, Brazil.
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2
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Akhtar S, Alsayed RKME, Ahmad F, AlHammadi A, Al-Khawaga S, AlHarami SMAM, Alam MA, Al Naama KAHN, Buddenkotte J, Uddin S, Steinhoff M, Ahmad A. Epigenetic control of inflammation in Atopic Dermatitis. Semin Cell Dev Biol 2024; 154:199-207. [PMID: 37120405 DOI: 10.1016/j.semcdb.2023.04.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 04/12/2023] [Accepted: 04/16/2023] [Indexed: 05/01/2023]
Abstract
Atopic dermatitis (AD), also known as atopic eczema, is a common but also complex chronic, itchy skin condition with underlying inflammation of the skin. This skin ailment is prevalent worldwide and affects people of all ages, particularly children below five years of age. The itching and resulting rashes in AD patients are often the result of inflammatory signals, thus necessitating a closer look at the inflammation-regulating mechanisms for putative relief, care and therapy. Several chemical- as well as genetically-induced animal models have established the importance of targeting pro-inflammatory AD microenvironment. Epigenetic mechanisms are gaining attention towards a better understanding of the onset as well as the progression of inflammation. Several physiological processes with implications in pathophysiology of AD, such as, barrier dysfunction either due to reduced filaggrin / human β-defensins or altered microbiome, reprograming of Fc receptors with resulting overexpression of high affinity IgE receptors, elevated eosinophil numbers or the elevated IL-22 production by CD4 + T cells have underlying epigenetic mechanisms that include differential promoter methylation and/or regulation by non-coding RNAs. Reversing these epigenetic changes has been verified to reduce inflammatory burden through altered secretion of cytokines IL-6, IL-4, IL-13, IL-17, IL-22 etc, with benefit against AD progression in experimental models. A thorough understanding of epigenetic remodeling of inflammation in AD has the potential of opening avenues for novel diagnostic, prognostic and therapeutic options.
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Affiliation(s)
- Sabah Akhtar
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar
| | - Reem Khaled M E Alsayed
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar
| | - Fareed Ahmad
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Dermatology Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Department of Dermatology and Venereology, Rumailah Hospital, Hamad Medical Corporation, Doha 3050, Qatar
| | - Ayda AlHammadi
- Department of Dermatology and Venereology, Rumailah Hospital, Hamad Medical Corporation, Doha 3050, Qatar
| | - Sara Al-Khawaga
- Department of Dermatology and Venereology, Rumailah Hospital, Hamad Medical Corporation, Doha 3050, Qatar
| | | | - Majid Ali Alam
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Dermatology Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Department of Dermatology and Venereology, Rumailah Hospital, Hamad Medical Corporation, Doha 3050, Qatar
| | | | - Joerg Buddenkotte
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Dermatology Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Department of Dermatology and Venereology, Rumailah Hospital, Hamad Medical Corporation, Doha 3050, Qatar
| | - Shahab Uddin
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Dermatology Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Laboratory Animal Research Center, Qatar University, Doha 2713, Qatar
| | - Martin Steinhoff
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Dermatology Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Department of Dermatology and Venereology, Rumailah Hospital, Hamad Medical Corporation, Doha 3050, Qatar; Weill Cornell Medicine-Qatar, Medical School, Doha 24144, Qatar; Dept. of Dermatology, Weill Cornell Medicine, New York 10065, NY, USA.
| | - Aamir Ahmad
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Dermatology Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; Department of Dermatology and Venereology, Rumailah Hospital, Hamad Medical Corporation, Doha 3050, Qatar.
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3
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Cardenas A, Fadadu R, Bunyavanich S. Climate change and epigenetic biomarkers in allergic and airway diseases. J Allergy Clin Immunol 2023; 152:1060-1072. [PMID: 37741554 PMCID: PMC10843253 DOI: 10.1016/j.jaci.2023.09.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 09/18/2023] [Accepted: 09/18/2023] [Indexed: 09/25/2023]
Abstract
Human epigenetic variation is associated with both environmental exposures and allergic diseases and can potentially serve as a biomarker connecting climate change with allergy and airway diseases. In this narrative review, we summarize recent human epigenetic studies examining exposure to temperature, precipitation, extreme weather events, and malnutrition to discuss findings as they relate to allergic and airway diseases. Temperature has been the most widely studied exposure, with the studies implicating both short-term and long-term exposures with epigenetic alterations and epigenetic aging. Few studies have examined natural disasters or extreme weather events. The studies available have reported differential DNA methylation of multiple genes and pathways, some of which were previously associated with asthma or allergy. Few studies have integrated climate-related events, epigenetic biomarkers, and allergic disease together. Prospective longitudinal studies are needed along with the collection of target tissues beyond blood samples, such as nasal and skin cells. Finally, global collaboration to increase diverse representation of study participants, particularly those most affected by climate injustice, as well as strengthen replication, validation, and harmonization of measurements will be needed to elucidate the impacts of climate change on the human epigenome.
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Affiliation(s)
- Andres Cardenas
- Department of Epidemiology and Population Health, Stanford University, Stanford, Calif.
| | - Raj Fadadu
- School of Medicine, University of California, San Francisco, Calif
| | - Supinda Bunyavanich
- Division of Allergy and Immunology, Department of Pediatrics, and Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY
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4
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Grafanaki K, Antonatos C, Maniatis A, Petropoulou A, Vryzaki E, Vasilopoulos Y, Georgiou S, Gregoriou S. Intrinsic Effects of Exposome in Atopic Dermatitis: Genomics, Epigenomics and Regulatory Layers. J Clin Med 2023; 12:4000. [PMID: 37373692 DOI: 10.3390/jcm12124000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/03/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
Atopic dermatitis (AD) or atopic eczema is an increasingly manifested inflammatory skin disorder of complex etiology which is modulated by both extrinsic and intrinsic factors. The exposome includes a person's lifetime exposures and their effects. We recently reviewed the extrinsic exposome's environmental risk factors that contribute to AD. The periods of pregnancy, infancy, and teenage years are recognized as crucial stages in the formation of AD, where the exposome leads to enduring impacts on the immune system. However, research is now focusing on the interactions between intrinsic pathways that are modulated by the extrinsic exposome, including genetic variation, epigenetic modifications, and signals, such as diet, stress, and microbiome interactions. As a result, immune dysregulation, barrier dysfunction, hormonal fluctuations, and skin microbiome dysbiosis are important factors contributing to AD development, and their in-depth understanding is crucial not only for AD treatment but also for similar inflammatory disorders.
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Affiliation(s)
- Katerina Grafanaki
- Department of Dermatology-Venereology, School of Medicine, University of Patras, 26504 Patras, Greece
- Department of Biochemistry, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Charalabos Antonatos
- Laboratory of Genetics, Section of Genetics, Cell Biology and Development, Department of Biology, University of Patras, 26504 Patras, Greece
| | - Alexandros Maniatis
- Department of Biochemistry, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Antonia Petropoulou
- Department of Biochemistry, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Eleftheria Vryzaki
- Department of Dermatology-Venereology, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Yiannis Vasilopoulos
- Laboratory of Genetics, Section of Genetics, Cell Biology and Development, Department of Biology, University of Patras, 26504 Patras, Greece
| | - Sophia Georgiou
- Department of Dermatology-Venereology, School of Medicine, University of Patras, 26504 Patras, Greece
| | - Stamatis Gregoriou
- Department of Dermatology-Venereology, Faculty of Medicine, Andreas Sygros Hospital, National and Kapodistrian University of Athens, 16121 Athens, Greece
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5
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Agelopoulos K, Renkhold L, Wiegmann H, Dugas M, Süer A, Zeidler C, Schmelz M, Pereira MP, Ständer S. Transcriptomic, Epigenomic, and Neuroanatomic Signatures Differ in Chronic Prurigo, Atopic Dermatitis, and Brachioradial Pruritus. J Invest Dermatol 2023; 143:264-272.e3. [PMID: 36075451 DOI: 10.1016/j.jid.2022.08.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/28/2022] [Accepted: 08/05/2022] [Indexed: 01/25/2023]
Abstract
Scratching and scratch-induced injuries, including neuroanatomical alterations, are key characteristics of chronic pruritus entities of different origins. The aim of this study was to link gene expression (array hybridization, qPCR) with DNA methylation (array hybridization) and neuroanatomy (PGP9.5 staining) in chronic nodular prurigo (CNPG), atopic dermatitis (AD), brachioradial pruritus (BRP), and matched healthy controls. Specific signatures of gene expression and DNA methylation clearly discriminated pruritic lesional skin from nonpruritic skin in CNPG and from healthy skin of volunteers, respectively. Although intraepidermal nerve fiber density was indiscriminately reduced, the level of epidermal branching, assessed by a semiquantitative pattern analysis, differentiated the entities (CNPG > BRP > AD). Correspondingly, repellent SEMA3A showed the highest expression in AD, whereas axonal growth-promoting nerve GF was most prominent in CNPG and BRP. Overexpression of genes for nerve fiber regeneration (NELL2/NFKB/ARTN) was found in AD and CNPG but not in BRP. Our findings suggest that differential branching patterns rather than mere innervation density separate chronic itch conditions and reflect disease-specific local expression profiles. In pruritic dermatoses (AD and CNPG), nerve injury and subsequent sprouting may primarily result from chronic scratching, whereas genuine neuropathy is expected to underlie BRP.
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Affiliation(s)
- Konstantin Agelopoulos
- Department of Dermatology and Center for Chronic Pruritus, University Hospital Münster, Münster, Germany.
| | - Lina Renkhold
- Department of Dermatology and Center for Chronic Pruritus, University Hospital Münster, Münster, Germany
| | - Henning Wiegmann
- Department of Dermatology and Center for Chronic Pruritus, University Hospital Münster, Münster, Germany
| | - Martin Dugas
- Institute of Medical Informatics, University of Münster, Münster, Germany; Institute of Medical Informatics, University Hospital Heidelberg, Heidelberg, Germany
| | - Aysenur Süer
- Institute of Medical Informatics, University of Münster, Münster, Germany
| | - Claudia Zeidler
- Department of Dermatology and Center for Chronic Pruritus, University Hospital Münster, Münster, Germany
| | - Martin Schmelz
- Department of Experimental Pain Research, Mannheim Centre for Translational Neuroscience, Faculty of Medicine Mannheim, University of Heidelberg, Mannheim, Germany
| | - Manuel P Pereira
- Department of Dermatology and Center for Chronic Pruritus, University Hospital Münster, Münster, Germany
| | - Sonja Ständer
- Department of Dermatology and Center for Chronic Pruritus, University Hospital Münster, Münster, Germany
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6
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Epigenetic Mechanisms of Epidermal Differentiation. Int J Mol Sci 2022; 23:ijms23094874. [PMID: 35563264 PMCID: PMC9102508 DOI: 10.3390/ijms23094874] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/24/2022] [Accepted: 04/27/2022] [Indexed: 12/12/2022] Open
Abstract
Keratinocyte differentiation is an essential process for epidermal stratification and stratum corneum formation. Keratinocytes proliferate in the basal layer of the epidermis and start their differentiation by changing their functional or phenotypical type; this process is regulated via induction or repression of epidermal differentiation complex (EDC) genes that play a pivotal role in epidermal development. Epidermal development and the keratinocyte differentiation program are orchestrated by several transcription factors, signaling pathways, and epigenetic regulators. The latter exhibits both activating and repressive effects on chromatin in keratinocytes via the ATP-dependent chromatin remodelers, histone demethylases, and genome organizers that promote terminal keratinocyte differentiation, and the DNA methyltransferases, histone deacetylases, and Polycomb components that stimulate proliferation of progenitor cells and inhibit premature activation of terminal differentiation-associated genes. In addition, microRNAs are involved in different processes between proliferation and differentiation during the program of epidermal development. Here, we bring together current knowledge of the mechanisms controlling gene expression during keratinocyte differentiation. An awareness of epigenetic mechanisms and their alterations in health and disease will help to bridge the gap between our current knowledge and potential applications for epigenetic regulators in clinical practice to pave the way for promising target therapies.
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7
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Smits JPH, Dirks RAM, Qu J, Oortveld MAW, Brinkman AB, Zeeuwen PLJM, Schalkwijk J, Zhou H, Marks H, van den Bogaard EH. Terminal keratinocyte differentiation in vitro is associated with a stable DNA methylome. Exp Dermatol 2021; 30:1023-1032. [PMID: 32681572 PMCID: PMC8359404 DOI: 10.1111/exd.14153] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 07/06/2020] [Accepted: 07/08/2020] [Indexed: 12/22/2022]
Abstract
The epidermal compartment of the skin is regenerated constantly by proliferation of epidermal keratinocytes. Differentiation of a subset of these keratinocytes allows the epidermis to retain its barrier properties. Regulation of keratinocyte fate-whether to remain proliferative or terminally differentiate-is complex and not fully understood. The objective of our study was to assess if DNA methylation changes contribute to the regulation of keratinocyte fate. We employed genome-wide MethylationEPIC beadchip array measuring approximately 850 000 probes combined with RNA sequencing of in vitro cultured non-differentiated and terminally differentiated adult human primary keratinocytes. We did not observe a correlation between methylation status and transcriptome changes. Moreover, only two differentially methylated probes were detected, of which one was located in the TRIM29 gene. Although TRIM29 knock-down resulted in lower expression levels of terminal differentiation genes, these changes were minor. From these results, we conclude that-in our in vitro experimental setup-it is unlikely that changes in DNA methylation have an important regulatory role in terminal keratinocyte differentiation.
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Affiliation(s)
- Jos P. H. Smits
- Department of DermatologyRadboud Institute for Molecular Life Sciences (RIMLS)Radboud University Medical Center (Radboudumc)NijmegenThe Netherlands
| | - René A. M. Dirks
- Department of Molecular BiologyFaculty of ScienceRadboud UniversityNijmegenThe Netherlands
| | - Jieqiong Qu
- Department of Molecular Developmental BiologyFaculty of ScienceRadboud UniversityNijmegenThe Netherlands
| | - Merel A. W. Oortveld
- Department of DermatologyRadboud Institute for Molecular Life Sciences (RIMLS)Radboud University Medical Center (Radboudumc)NijmegenThe Netherlands
| | - Arie B. Brinkman
- Department of Molecular BiologyFaculty of ScienceRadboud UniversityNijmegenThe Netherlands
| | - Patrick L. J. M. Zeeuwen
- Department of DermatologyRadboud Institute for Molecular Life Sciences (RIMLS)Radboud University Medical Center (Radboudumc)NijmegenThe Netherlands
| | - Joost Schalkwijk
- Department of DermatologyRadboud Institute for Molecular Life Sciences (RIMLS)Radboud University Medical Center (Radboudumc)NijmegenThe Netherlands
| | - Huiqing Zhou
- Department of Molecular Developmental BiologyFaculty of ScienceRadboud UniversityNijmegenThe Netherlands
- Department of Human GeneticsRIMLS, RadboudumcNijmegenThe Netherlands
| | - Hendrik Marks
- Department of Molecular BiologyFaculty of ScienceRadboud UniversityNijmegenThe Netherlands
| | - Ellen H. van den Bogaard
- Department of DermatologyRadboud Institute for Molecular Life Sciences (RIMLS)Radboud University Medical Center (Radboudumc)NijmegenThe Netherlands
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8
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Affiliation(s)
- Bogi Andersen
- Departments of Medicine and Biological Chemistry, University of California, Irvine
| | - Sarah Millar
- Black Family Stem Cell Institute, Departments of Cell, Developmental and Regenerative Biology and Dermatology, Icahn School of Medicine at Mount Sinai
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9
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Böhm M. In search of the needle in a haystack: Finding a suitable serum biomarker for monitoring disease activity of systemic sclerosis. Exp Dermatol 2021; 30:880-886. [PMID: 34121239 DOI: 10.1111/exd.14403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Markus Böhm
- Department of Dermatology, University of Münster, Münster, Germany
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10
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Zhang LJ. Recent progress at the psoriasis and atopic dermatitis research front: An experimental dermatology perspective. Exp Dermatol 2021; 30:756-764. [PMID: 34057758 DOI: 10.1111/exd.14388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ling-Juan Zhang
- State Key Laboratory of Cellular Stress Biology, School of Pharmaceutical Sciences, Xiamen University, Xiamen, China.,Department of Dermatology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
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11
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Wagner RN, Piñón Hofbauer J, Wally V, Kofler B, Schmuth M, De Rosa L, De Luca M, Bauer JW. Epigenetic and metabolic regulation of epidermal homeostasis. Exp Dermatol 2021; 30:1009-1022. [PMID: 33600038 PMCID: PMC8359218 DOI: 10.1111/exd.14305] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/11/2021] [Accepted: 02/14/2021] [Indexed: 02/06/2023]
Abstract
Continuous exposure of the skin to environmental, mechanical and chemical stress necessitates constant self‐renewal of the epidermis to maintain its barrier function. This self‐renewal ability is attributed to epidermal stem cells (EPSCs), which are long‐lived, multipotent cells located in the basal layer of the epidermis. Epidermal homeostasis – coordinated proliferation and differentiation of EPSCs – relies on fine‐tuned adaptations in gene expression which in turn are tightly associated with specific epigenetic signatures and metabolic requirements. In this review, we will briefly summarize basic concepts of EPSC biology and epigenetic regulation with relevance to epidermal homeostasis. We will highlight the intricate interplay between mitochondrial energy metabolism and epigenetic events – including miRNA‐mediated mechanisms – and discuss how the loss of epigenetic regulation and epidermal homeostasis manifests in skin disease. Discussion of inherited epidermolysis bullosa (EB) and disorders of cornification will focus on evidence for epigenetic deregulation and failure in epidermal homeostasis, including stem cell exhaustion and signs of premature ageing. We reason that the epigenetic and metabolic component of epidermal homeostasis is significant and warrants close attention. Charting epigenetic and metabolic complexities also represents an important step in the development of future systemic interventions aimed at restoring epidermal homeostasis and ameliorating disease burden in severe skin conditions.
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Affiliation(s)
- Roland N Wagner
- Department of Dermatology and Allergology, University Hospital of the Paracelsus Medical University, Salzburg, Austria
| | - Josefina Piñón Hofbauer
- EB House Austria, Research Program for Molecular Therapy of Genodermatoses, Department of Dermatology and Allergology, University Hospital of the Paracelsus Medical University, Salzburg, Austria
| | - Verena Wally
- EB House Austria, Research Program for Molecular Therapy of Genodermatoses, Department of Dermatology and Allergology, University Hospital of the Paracelsus Medical University, Salzburg, Austria
| | - Barbara Kofler
- Research Program for Receptor Biochemistry and Tumor Metabolism, Department of Pediatrics, University Hospital of the Paracelsus Medical University, Salzburg, Austria
| | - Matthias Schmuth
- Department of Dermatology, Medical University Innsbruck, Innsbruck, Austria
| | - Laura De Rosa
- Holostem Terapie Avanzate S.r.l., Center for Regenerative Medicine "Stefano Ferrari", Modena, Italy
| | - Michele De Luca
- Center for Regenerative Medicine "Stefano Ferrari", Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Johann W Bauer
- Department of Dermatology and Allergology, University Hospital of the Paracelsus Medical University, Salzburg, Austria
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12
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Gilhar A, Reich K, Keren A, Kabashima K, Steinhoff M, Paus R. Mouse models of atopic dermatitis: a critical reappraisal. Exp Dermatol 2021; 30:319-336. [PMID: 33368555 DOI: 10.1111/exd.14270] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 12/17/2020] [Accepted: 12/17/2020] [Indexed: 12/13/2022]
Abstract
Mouse models for atopic dermatitis (AD) are an indispensable preclinical research tool for testing new candidate AD therapeutics and for interrogating AD pathobiology in vivo. In this Viewpoint, we delineate why, unfortunately, none of the currently available so-called "AD" mouse models satisfactorily reflect the clinical complexity of human AD, but imitate more "allergic" or "irriant" contact dermatitis conditions. This limits the predictive value of AD models for clinical outcomes of new tested candidate AD therapeutics and the instructiveness of mouse models for human AD pathophysiology research. Here, we propose to initiate a rational debate on the minimal criteria that a mouse model should meet in order to be considered relevant for human AD. We suggest that valid AD models should at least meet the following criteria: (a) an AD-like epidermal barrier defect with reduced filaggrin expression along with hyperproliferation, hyperplasia; (b) increased epidermal expression of thymic stromal lymphopoietin (TSLP), periostin and/or chemokines such as TARC (CCL17); (c) a characteristic dermal immune cell infiltrate with overexpression of some key cytokines such as IL-4, IL-13, IL-31 and IL-33; (d) distinctive "neurodermatitis" features (sensory skin hyperinnervation, defective beta-adrenergic signalling, neurogenic skin inflammation and triggering or aggravation of AD-like skin lesions by perceived stress); and (e) response of experimentally induced skin lesions to standard AD therapy. Finally, we delineate why humanized AD mouse models (human skin xenotransplants on SCID mice) offer a particularly promising preclinical research alternative to the currently available "AD" mouse models.
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Affiliation(s)
- Amos Gilhar
- Skin Research Laboratory, Rappaport Faculty of Medicine, Technion -Israel Institute of Technology, Haifa, Israel.,Rambam Health Care Campus, Haifa, Israel
| | - Kristian Reich
- Centre for Translational Research in Inflammatory Skin Diseases, Institute for Health Services Research in Dermatology and Nursing, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Skinflammation Center, Hamburg, Germany
| | - Aviad Keren
- Skin Research Laboratory, Rappaport Faculty of Medicine, Technion -Israel Institute of Technology, Haifa, Israel
| | - Kenji Kabashima
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.,Singapore Immunology Network (SIgN) and Institute of Medical Biology, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore, Singapore
| | - Martin Steinhoff
- Department of Dermatology and Venereology, Hamad Medical Corporation, Qatar University, Doha, Qatar.,School of Medicine, Weill Cornell University-Qatar and Qatar University, Doha, Qatar
| | - Ralf Paus
- Dr. Phillip Frost, Department of Dermatology & Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, FL, USA.,Dermatology Research Centre, University of Manchester and NIHR Manchester Biomedical Research Centre, Manchester, UK.,Monasterium Laboratory, Münster, Germany
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13
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Alghamdi MA, AL-Eitan LN, Tarkhan AH, Al-Qarqaz FA. Global gene methylation profiling of common warts caused by human papillomaviruses infection. Saudi J Biol Sci 2021; 28:612-622. [PMID: 33424347 PMCID: PMC7783806 DOI: 10.1016/j.sjbs.2020.10.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 12/23/2022] Open
Abstract
Infection with the human papillomaviruses (HPV) often involves the epigenetic modification of the host genome. Despite its prevalence among the population, host genome methylation in HPV-induced warts is not clearly understood. In this study, genome-wide methylation profiling was carried out on paired healthy skin and wart samples in order to investigate the effects that benign HPV infection has on gene methylation status. To overcome this gap in knowledge, paired wart (n = 12) and normal skin (n = 12) samples were obtained from Arab males in order to perform DNA extraction and subsequent genome-wide methylation profiling on the Infinium Methylation EPIC Bead Chip microarray. Analysis of differential methylation revealed a clear pattern of discrimination between the wart and normal skin samples. In warts, the most differentially methylated (DM) genes included long non-coding RNAs (AC005884, AL049646.2, AC126121.2, AP001790.1, and AC107959.3), microRNAs (MIR374B, MIR596, MIR1255B1, MIR26B, and MIR196A2),snoRNAs (SNORD114-22, SNORD70, and SNORD114-31), pseudogenes (AC069366.1, RNU4ATAC11P, AC120057.1, NANOGP3, AC106038.2, TPT1P2, SDC4P, PKMP3, and VN2R3P), and protein-coding genes (AREG, GJB2, C12orf71, AC020909.2, S100A8, ZBED2, FABP7, and CYSLTR1). In addition, pathway analysis revealed that, among the most differentially methylated genes, STAT5A, RARA, MEF2D, MAP3K8, and THRA were the common regulators. It can be observed that HPV-induced warts involve a clear and unique epigenetic alteration to the host genome.
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Affiliation(s)
- Mansour A. Alghamdi
- Department of Anatomy, College of Medicine, King Khalid University, Abha 61421, Saudi Arabia
- Genomics and Personalized Medicine Unit, College of Medicine, King Khalid University, Abha 61421, Saudi Arabia
| | - Laith N. AL-Eitan
- Department of Applied Biological Sciences, Jordan University of Science and Technology, Irbid 22110, Jordan
- Department of Biotechnology and Genetic Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Amneh H. Tarkhan
- Department of Applied Biological Sciences, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Firas A. Al-Qarqaz
- Department of Internal Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
- Division of Dermatology, Department of Internal Medicine, King Abdullah University Hospital Jordan University of Science and Technology, Irbid 22110, Jordan
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Leśniak W. Epigenetic Regulation of Epidermal Differentiation. EPIGENOMES 2021; 5:1. [PMID: 34968254 PMCID: PMC8594726 DOI: 10.3390/epigenomes5010001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/19/2020] [Accepted: 12/23/2020] [Indexed: 01/22/2023] Open
Abstract
The epidermis is the outer part of the skin that protects the organism from dehydration and shields from external insults. Epidermal cells, called keratinocytes, undergo a series of morphological and metabolic changes that allow them to establish the biochemical and structural elements of an effective epidermal barrier. This process, known as epidermal differentiation, is critical for the maintenance of the epidermis under physiological conditions and also under stress or in various skin pathologies. Epidermal differentiation relies on a highly coordinated program of gene expression. Epigenetic mechanisms, which commonly include DNA methylation, covalent histone modifications, and microRNA (miRNA) activity, modulate various stages of gene expression by altering chromatin accessibility and mRNA stability. Their involvement in epidermal differentiation is a matter of intensive studies, and the results obtained thus far show a complex network of epigenetic factors, acting together with transcriptional regulators, to maintain epidermal homeostasis and counteract adverse effects of environmental stressors.
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Affiliation(s)
- Wiesława Leśniak
- Laboratory of Calcium Binding Proteins, Nencki Institute of Experimental Biology of the Polish Academy of Sciences, 3 Pasteur Street, 02-093 Warsaw, Poland
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