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Bowman WS, Schmidt RJ, Sanghar GK, Thompson Iii GR, Ji H, Zeki AA, Haczku A. "Air That Once Was Breath" Part 1: Wildfire-Smoke-Induced Mechanisms of Airway Inflammation - "Climate Change, Allergy and Immunology" Special IAAI Article Collection: Collegium Internationale Allergologicum Update 2023. Int Arch Allergy Immunol 2024; 185:600-616. [PMID: 38452750 DOI: 10.1159/000536578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 01/23/2024] [Indexed: 03/09/2024] Open
Abstract
BACKGROUND Wildfires are a global concern due to their wide-ranging environmental, economic, and public health impacts. Climate change contributes to an increase in the frequency and intensity of wildfires making smoke exposure a more significant and recurring health concern for individuals with airway diseases. Some of the most prominent effects of wildfire smoke exposure are asthma exacerbations and allergic airway sensitization. Likely due to the delayed recognition of its health impacts in comparison with cigarette smoke and industrial or traffic-related air pollution, research on the composition, the mechanisms of toxicity, and the cellular/molecular pathways involved is poor or non-existent. SUMMARY This review discusses potential underlying pathological mechanisms of wildfire-smoke-related allergic airway disease and asthma. We focused on major gaps in understanding the role of wildfire smoke composition in the development of airway disease and the known and potential mechanisms involving cellular and molecular players of oxidative injury at the epithelial barrier in airway inflammation. We examine how PM2.5, VOCs, O3, endotoxin, microbes, and toxic gases may affect oxidative stress and inflammation in the respiratory mucosal barrier. We discuss the role of AhR in mediating smoke's effects in alarmin release and IL-17A production and how glucocorticoid responsiveness may be impaired by IL-17A-induced signaling and epigenetic changes leading to steroid-resistant severe airway inflammation. KEY MESSAGE Effective mitigation of wildfire-smoke-related respiratory health effects would require comprehensive research efforts aimed at a better understanding of the immune regulatory effects of wildfire smoke in respiratory health and disease.
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Affiliation(s)
- Willis S Bowman
- UC Davis Lung Center, University of California, Davis, California, USA
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine, Sacramento, California, USA
| | - Rebecca J Schmidt
- Department of Public Health Sciences, School of Medicine, Sacramento, California, USA
| | - Gursharan K Sanghar
- UC Davis Lung Center, University of California, Davis, California, USA
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine, Sacramento, California, USA
| | - George R Thompson Iii
- UC Davis Lung Center, University of California, Davis, California, USA
- Division of Infectious Diseases, Department of Medicine, School of Medicine, Sacramento, California, USA
| | - Hong Ji
- UC Davis Lung Center, University of California, Davis, California, USA
- Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, Davis, California, USA
| | - Amir A Zeki
- UC Davis Lung Center, University of California, Davis, California, USA
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine, Sacramento, California, USA
| | - Angela Haczku
- UC Davis Lung Center, University of California, Davis, California, USA
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine, Sacramento, California, USA
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Yeung-Luk BH, Wally A, Swaby C, Jauregui S, Lee E, Zhang R, Chen D, Luk SH, Upadya N, Tieng E, Wilmsen K, Sherman E, Sudhakar D, Luk M, Shrivastav AK, Cao S, Ghosh B, Christenson SA, Huang YJ, Ortega VE, Biswal S, Tang WY, Sidhaye VK. Epigenetic Reprogramming Drives Epithelial Disruption in Chronic Obstructive Pulmonary Disease. Am J Respir Cell Mol Biol 2024; 70:165-177. [PMID: 37976469 PMCID: PMC10914773 DOI: 10.1165/rcmb.2023-0147oc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 11/17/2023] [Indexed: 11/19/2023] Open
Abstract
Chronic obstructive pulmonary disease (COPD) remains a major public health challenge that contributes greatly to mortality and morbidity worldwide. Although it has long been recognized that the epithelium is altered in COPD, there has been little focus on targeting it to modify the disease course. Therefore, mechanisms that disrupt epithelial cell function in patients with COPD are poorly understood. In this study, we sought to determine whether epigenetic reprogramming of the cell-cell adhesion molecule E-cadherin, encoded by the CDH1 gene, disrupts epithelial integrity. By reducing these epigenetic marks, we can restore epithelial integrity and rescue alveolar airspace destruction. We used differentiated normal and COPD-derived primary human airway epithelial cells, genetically manipulated mouse tracheal epithelial cells, and mouse and human precision-cut lung slices to assess the effects of epigenetic reprogramming. We show that the loss of CDH1 in COPD is due to increased DNA methylation site at the CDH1 enhancer D through the downregulation of the ten-eleven translocase methylcytosine dioxygenase (TET) enzyme TET1. Increased DNA methylation at the enhancer D region decreases the enrichment of RNA polymerase II binding. Remarkably, treatment of human precision-cut slices derived from patients with COPD with the DNA demethylation agent 5-aza-2'-deoxycytidine decreased cell damage and reduced air space enlargement in the diseased tissue. Here, we present a novel mechanism that targets epigenetic modifications to reverse the tissue remodeling in human COPD lungs and serves as a proof of concept for developing a disease-modifying target.
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Affiliation(s)
| | - Ara Wally
- Department of Environmental Health and Engineering and
- Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | - Carter Swaby
- Department of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Sofia Jauregui
- Department of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Esther Lee
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Rachel Zhang
- Department of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Daniel Chen
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Sean H. Luk
- Department of Environmental Health and Engineering and
| | - Nisha Upadya
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Ethan Tieng
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Kai Wilmsen
- Department of Environmental Health and Engineering and
| | - Ethan Sherman
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Dheeksha Sudhakar
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Matthew Luk
- Department of Environmental Health and Engineering and
| | - Abhishek Kumar Shrivastav
- Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, University of California, San Francisco, San Francisco, California
| | - Shuo Cao
- Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, University of California, San Francisco, San Francisco, California
| | | | - Stephanie A. Christenson
- Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, University of California, San Francisco, San Francisco, California
| | - Yvonne J. Huang
- Department of Medicine, University of Michigan, Ann Arbor, Michigan; and
| | | | - Shyam Biswal
- Department of Environmental Health and Engineering and
| | - Wan-yee Tang
- Department of Environmental Health and Engineering and
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Venkataramana K. Sidhaye
- Department of Environmental Health and Engineering and
- Department of Pulmonary and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland
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Brown AP, Parameswaran S, Cai L, Elston S, Pham C, Barski A, Weirauch MT, Ji H. TET1 regulates responses to house dust mite by altering chromatin accessibility, DNA methylation, and gene expression in airway epithelial cells. RESEARCH SQUARE 2023:rs.3.rs-3726852. [PMID: 38168374 PMCID: PMC10760239 DOI: 10.21203/rs.3.rs-3726852/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Background Previous studies have identified TET1 as a potential key regulator of genes linked to asthma. TET1 has been shown to transcriptionally respond to house dust mite extract, an allergen known to directly cause allergic asthma development, and regulate the expression of genes involved in asthma. How TET1 regulates expression of these genes, however, is unknown. TET1 is a DNA demethylase; therefore, most prior research on TET1-based gene regulation has focused on how TET1 affects methylation. However, TET1 can also interact directly with transcription factors and histone modifiers to regulate gene expression. Understanding how TET1 regulates expression to contribute to allergic responses and asthma development thus requires a comprehensive approach. To this end, we measured mRNA expression, DNA methylation, chromatin accessibility and histone modifications in control and TET1 knockdown human bronchial epithelial cells treated or untreated with house dust mite extract. Results Throughout our analyses, we detected strong similarities between the effects of TET1 knockdown alone and the effects of HDM treatment alone. One especially striking pattern was that both TET1 knockdown and HDM treatment generally led to decreased chromatin accessibility at largely the same genomic loci. Transcription factor enrichment analyses indicated that altered chromatin accessibility following the loss of TET1 may affect, or be affected by, CTCF and CEBP binding. TET1 loss also led to changes in DNA methylation, but these changes were generally in regions where accessibility was not changing. Conclusions TET1 regulates gene expression through different mechanisms (DNA methylation and chromatin accessibility) in different parts of the genome in the airway epithelial cells, which mediates inflammatory responses to allergen. Collectively, our data suggest novel molecular mechanisms through which TET1 regulates critical pathways following allergen challenges and contributes to the development of asthma.
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Affiliation(s)
| | | | | | | | | | | | | | - Hong Ji
- University of California Davis
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4
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Ji H, Brown AP, Henson SN, Haczku A. The "epiTet" of Air Pollution: Epigenetic Regulation of Airway Inflammation by Tet1. Int Arch Allergy Immunol 2023; 184:949-952. [PMID: 37276849 PMCID: PMC10530385 DOI: 10.1159/000530272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 03/17/2023] [Indexed: 06/07/2023] Open
Affiliation(s)
- Hong Ji
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, California, USA
- California National Primate Research Center, University of California, Davis, California, USA
| | - Anthony P Brown
- California National Primate Research Center, University of California, Davis, California, USA
| | - Stephanie N Henson
- California National Primate Research Center, University of California, Davis, California, USA
| | - Angela Haczku
- California National Primate Research Center, University of California, Davis, California, USA
- Division of Pulmonary, Critical Care and Sleep Medicine, Lung Center, Department of Internal Medicine, School of Medicine, University of California, Davis, California, USA
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The Binomial "Inflammation-Epigenetics" in Breast Cancer Progression and Bone Metastasis: IL-1β Actions Are Influenced by TET Inhibitor in MCF-7 Cell Line. Int J Mol Sci 2022; 23:ijms232315422. [PMID: 36499741 PMCID: PMC9741332 DOI: 10.3390/ijms232315422] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 11/25/2022] [Accepted: 12/02/2022] [Indexed: 12/12/2022] Open
Abstract
The existence of a tight relationship between inflammation and epigenetics that in primary breast tumor cells can lead to tumor progression and the formation of bone metastases was investigated. It was highlighted how the induction of tumor progression and bone metastasis by Interleukin-1 beta, in a non-metastatic breast cancer cell line, MCF-7, was dependent on the de-methylating actions of ten-eleven translocation proteins (TETs). In fact, the inhibition of their activity by the Bobcat339 molecule, an inhibitor of TET enzymes, determined on the one hand, the modulation of the epithelial-mesenchymal transition process, and on the other hand, the reduction in the expression of markers of bone metastasis, indicating that the epigenetic action of TETs is a prerequisite for IL-1β-dependent tumor progression and bone metastasis formation.
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Metabolomic Profiling of Samples from Pediatric Asthma Patients Unveils Deficient Nutrients in African Americans. iScience 2022; 25:104650. [PMID: 35811841 PMCID: PMC9263988 DOI: 10.1016/j.isci.2022.104650] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 06/06/2022] [Accepted: 06/16/2022] [Indexed: 11/26/2022] Open
Abstract
Plasma metabolomics represents a potentially powerful approach to understand the biochemical mechanisms of nutrition and metabolism in asthma. This study aims to acquire knowledge on plasma metabolites in asthma, which may provide avenues for nutrition therapy, as well as explanations for the observed effects in existing therapies. This study investigated 249 metabolites from 18 metabolite groups in a large cohort of African American population, including 602 pediatric patients with asthma and 593 controls, using a nuclear magnetic resonance (NMR) metabolomics platform. Decreased levels of citrate, ketone bodies, and two amino acids histidine (His) and glutamine (Gln), were observed in asthma cases compared to controls. Metabolites for lipid metabolism lost significance after controlling for comorbid obesity. For the first time, this study depicts a broad panorama of lipid metabolism and nutrition in asthma. Supplementation or augmentation of nutrients that are deficient may be beneficial for asthma care. Asthma is a major health issue in African Americans Metabolomics represents a powerful approach to understand the metabolism in asthma We observed decreased citrate, ketone bodies, and amino acids in the plasma Supplementation of nutrients that are deficient may be beneficial for asthma care
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Zhu T, Brown AP, Cai LP, Quon G, Ji H. Single-Cell RNA-Seq Analysis Reveals Lung Epithelial Cell Type-Specific Responses to HDM and Regulation by Tet1. Genes (Basel) 2022; 13:genes13050880. [PMID: 35627266 PMCID: PMC9140484 DOI: 10.3390/genes13050880] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/06/2022] [Accepted: 05/11/2022] [Indexed: 11/16/2022] Open
Abstract
Tet1 protects against house dust mite (HDM)-induced lung inflammation in mice and alters the lung methylome and transcriptome. In order to explore the role of Tet1 in individual lung epithelial cell types in HDM-induced inflammation, we established a model of HDM-induced lung inflammation in Tet1 knockout and littermate wild-type mice, then studied EpCAM+ lung epithelial cells using single-cell RNA-seq analysis. We identified eight EpCAM+ lung epithelial cell types, among which AT2 cells were the most abundant. HDM challenge altered the relative abundance of epithelial cell types and resulted in cell type-specific transcriptomic changes. Bulk and cell type-specific analysis also showed that loss of Tet1 led to the altered expression of genes linked to augmented HDM-induced lung inflammation, including alarms, detoxification enzymes, oxidative stress response genes, and tissue repair genes. The transcriptomic regulation was accompanied by alterations in TF activities. Trajectory analysis supports that HDM may enhance the differentiation of AP and BAS cells into AT2 cells, independent of Tet1. Collectively, our data showed that lung epithelial cells had common and unique transcriptomic signatures of allergic lung inflammation. Tet1 deletion altered transcriptomic networks in various lung epithelial cells, which may promote allergen-induced lung inflammation.
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Affiliation(s)
- Tao Zhu
- California National Primate Research Center, University of California, Davis, CA 95616, USA; (T.Z.); (A.P.B.); (L.P.C.)
| | - Anthony P. Brown
- California National Primate Research Center, University of California, Davis, CA 95616, USA; (T.Z.); (A.P.B.); (L.P.C.)
| | - Lucy P. Cai
- California National Primate Research Center, University of California, Davis, CA 95616, USA; (T.Z.); (A.P.B.); (L.P.C.)
| | - Gerald Quon
- Department of Molecular and Cellular Biology, Genome Center, University of California, Davis, CA 95616, USA;
| | - Hong Ji
- California National Primate Research Center, University of California, Davis, CA 95616, USA; (T.Z.); (A.P.B.); (L.P.C.)
- Department of Anatomy, Physiology and Cell biology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA
- Correspondence: ; Tel.: +1-530-754-0679
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8
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Lian BSX, Kawasaki T, Kano N, Ori D, Ikegawa M, Isotani A, Kawai T. Regulation of Il6 expression by single CpG methylation in downstream of Il6 transcription initiation site. iScience 2022; 25:104118. [PMID: 35402874 PMCID: PMC8983349 DOI: 10.1016/j.isci.2022.104118] [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: 09/23/2021] [Revised: 01/31/2022] [Accepted: 03/16/2022] [Indexed: 11/17/2022] Open
Abstract
The innate immune system is an immediate defense against infectious pathogens by the production of inflammatory cytokines and other mediators. Deficiencies of epigenetic regulatory enzymes, such as Tet1 and Dnmt1, cause dysregulation of cytokine expression. However, it is unclear if DNA methylation at a single CpG dinucleotide in a specific gene locus can regulate gene expression. In this study, we demonstrated that CpG+286 and CpG+348 in exon 2 of the Il6 gene are similar in various primary mouse cells. In lipopolysaccharide-stimulated condition, hypomethylated CpG+286 promoted Il6 expression whereas deletion of CpG+348 led to a reduction in Il6 expression associated with enhanced CTCF binding to the Il6 locus. Moreover, hypomethylation at CpG+286 in alveolar macrophages from aged mice led to higher Il6 expression in response to LPS compared with young mice. Thus, DNA methylation at specific CpG dinucleotides plays an important regulatory role in Il6 expression. TET enzymes regulate DNA methylation at Il6 TIS region and control Il6 expression DNA methylation level at CpG+286 in the Il6 locus directly controls Il6 expression Methylated CpG+348 regulates Il6 expression and CTCF recruitment to the Il6 locus Methylation of CpG+286 in alveolar macrophages controls age-related Il6 expression
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Affiliation(s)
- Benedict Shi Xiang Lian
- Laboratory of Molecular Immunobiology, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), Nara 630-0192, Japan
| | - Takumi Kawasaki
- Laboratory of Molecular Immunobiology, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), Nara 630-0192, Japan
- Corresponding author
| | - Norisuke Kano
- Laboratory of Molecular Immunobiology, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), Nara 630-0192, Japan
| | - Daisuke Ori
- Laboratory of Molecular Immunobiology, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), Nara 630-0192, Japan
| | - Moe Ikegawa
- Laboratory of Molecular Immunobiology, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), Nara 630-0192, Japan
| | - Ayako Isotani
- Laboratory of Organ Developmental Engineering, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), Nara 630-0192, Japan
| | - Taro Kawai
- Laboratory of Molecular Immunobiology, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), Nara 630-0192, Japan
- Corresponding author
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Tan L, Fu L, Zheng L, Fan W, Tan H, Tao Z, Xu Y. TET2 Regulates 5-Hydroxymethylcytosine Signature and CD4 + T-Cell Balance in Allergic Rhinitis. ALLERGY, ASTHMA & IMMUNOLOGY RESEARCH 2022; 14:254-272. [PMID: 35255541 PMCID: PMC8914607 DOI: 10.4168/aair.2022.14.2.254] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 01/03/2022] [Accepted: 01/16/2022] [Indexed: 11/23/2022]
Abstract
Purpose Previous studies have shown the role of ten-eleven translocation 2 (TET2) in CD4+ T cells. However, its function in CD4+ T cells under allergic inflammation is unclear. We aimed to investigate the epigenomic distribution of DNA 5-hydroxymethylcytosine (5hmC) and the role of TET2 in CD4+ T cells of allergic rhinitis (AR). Methods The hMeDIP-seq was performed to identify sequences with 5hmC deposition in CD4+ T cells of AR patients. Tet2-deficient or wild type mice were stimulated with ovalbumin (OVA) to develop an AR mouse model. The histopathology in nasal mucosae, Th1/Th2/Treg/Th17 cell percentage, concentrations of Th-related cytokines, expression of Tet and differential hydroxymethylated genes (DhMG), and the global deposition of 5hmC in sorted CD4+ T cells were detected. Results Epigenome-wide 5hmC landscape and DhMG in the CD4+ T cells of AR patients were identified. Tet2 depletion did not led to spontaneous inflammation. However, under the stimulation of allergen, OVA, loss of Tet2 resulted in the exacerbation of allergic inflammation, which was characterized by severer allergic symptoms, more inflammatory cells infiltrating the nasal lamina propria, sharper imbalances between Th1/Th2 and Treg/Th17 cells, and excessive secretion of OVA-specific IgE and Th2-related cytokines. Moreover, altered mRNA production of several DhMG and sharp decrease in 5hmC deposition were also observed in Tet2-deficient OVA-exposed mice. Conclusions TET2 may regulate DNA 5hmC, DhMG expressions, and CD4+ T cell balance in AR.
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Affiliation(s)
- Lu Tan
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China.,Research Institute of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Lisheng Fu
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China.,Research Institute of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Li Zheng
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China.,Research Institute of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Wenjun Fan
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China.,Research Institute of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Hanyu Tan
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China.,Research Institute of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Zezhang Tao
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China.,Research Institute of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yu Xu
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China.,Research Institute of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, China.
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10
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Liu Y, Huang Q, Du J, Huang C, Li D, Dai X, Liang R, Li B, Shi G. Comparative analysis of global transcriptome, proteome and acetylome in house dust mite-induced murine allergic asthma model. Clin Transl Med 2021; 11:e590. [PMID: 34841691 PMCID: PMC8571946 DOI: 10.1002/ctm2.590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 09/11/2021] [Accepted: 09/17/2021] [Indexed: 11/07/2022] Open
Affiliation(s)
- Yahui Liu
- Department of Respiratory and Critical Care MedicineRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Qianru Huang
- Department of Immunology and MicrobiologyShanghai Institute of ImmunologyShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Juan Du
- Department of Respiratory and Critical Care MedicineRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Chunrong Huang
- Department of Respiratory and Critical Care MedicineRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Dan Li
- Department of Immunology and MicrobiologyShanghai Institute of ImmunologyShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Xueyu Dai
- Department of Immunology and MicrobiologyShanghai Institute of ImmunologyShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Rui Liang
- Department of Immunology and MicrobiologyShanghai Institute of ImmunologyShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Bin Li
- Department of Immunology and MicrobiologyShanghai Institute of ImmunologyShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Guochao Shi
- Department of Respiratory and Critical Care MedicineRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
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11
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Hu X, Shen Y, Zhao Y, Wang J, Zhang X, Tu W, Kaufman W, Feng J, Gao P. Epithelial Aryl Hydrocarbon Receptor Protects From Mucus Production by Inhibiting ROS-Triggered NLRP3 Inflammasome in Asthma. Front Immunol 2021; 12:767508. [PMID: 34868022 PMCID: PMC8634667 DOI: 10.3389/fimmu.2021.767508] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 10/28/2021] [Indexed: 02/05/2023] Open
Abstract
Background Despite long-standing recognition in the significance of mucus overproduction in asthma, its etiology remains poorly understood. Muc5ac is a secretory mucin that has been associated with reduced pulmonary function and asthma exacerbations. Objectives We sought to investigate the immunological pathway that controls Muc5ac expression and allergic airway inflammation in asthma. Methods Cockroach allergen-induced Muc5ac expression and aryl hydrocarbon receptor (AhR) signaling activation was examined in the human bronchial epithelial cells (HBECs) and mouse model of asthma. AhR regulation of Muc5ac expression, mitochondrial ROS (Mito-ROS) generation, and NLRP3 inflammasome was determined by AhR knockdown, the antagonist CH223191, and AhR-/- mice. The role of NLRP3 inflammasome in Muc5ac expression and airway inflammation was also investigated. Results Cockroach allergen induced Muc5ac overexpression in HBECs and airways of asthma mouse model. Increased expression of AhR and its downstream genes CYP1A1 and CYP1B1 was also observed. Mice with AhR deletion showed increased allergic airway inflammation and MUC5AC expression. Moreover, cockroach allergen induced epithelial NLRP3 inflammasome activation (e.g., NLRP3, Caspase-1, and IL-1β), which was enhanced by AhR knockdown or the antagonist CH223191. Furthermore, AhR deletion in HBECs led to enhanced ROS generation, particularly Mito-ROS, and inhibition of ROS or Mito-ROS subsequently suppressed the inflammasome activation. Importantly, inhibition of the inflammasome with MCC950, a NLRP3-specifc inhibitor, attenuated allergic airway inflammation and Muc5ac expression. IL-1β generated by the activated inflammasomes mediated cockroach allergen-induced Muc5ac expression in HBECs. Conclusions These results reveal a previously unidentified functional axis of AhR-ROS-NLRP3 inflammasome in regulating Muc5ac expression and airway inflammation.
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Affiliation(s)
- Xinyue Hu
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Department of Respiratory Medicine, Xiangya Hospital, Central South University, Changsha, China
| | - Yingchun Shen
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Yilin Zhao
- Department of Respiratory Medicine, Xijing Hospital, The Fourth Military Medical University, Xi’an, China
| | - Ji Wang
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Pulmonary Immunology and Inflammation, Frontiers Science Center for Disease-Related Molecular Network, Sichuan University, Chengdu, China
| | - Xin Zhang
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Wei Tu
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Department of Respirology & Allergy, Third Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - William Kaufman
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Juntao Feng
- Department of Respiratory Medicine, Xiangya Hospital, Central South University, Changsha, China
| | - Peisong Gao
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
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12
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Hsu HL, Chen HK, Tsai CH, Liao PL, Chan YJ, Lee YC, Lee CC, Li CH. Aryl Hydrocarbon Receptor Defect Attenuates Mitogen-Activated Signaling through Leucine-Rich Repeats and Immunoglobulin-like Domains 1 (LRIG1)-Dependent EGFR Degradation. Int J Mol Sci 2021; 22:9988. [PMID: 34576152 PMCID: PMC8464816 DOI: 10.3390/ijms22189988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 09/05/2021] [Accepted: 09/11/2021] [Indexed: 11/17/2022] Open
Abstract
Aryl hydrocarbon receptor (AHR) genomic pathway has been well-characterized in a number of respiratory diseases. In addition, the cytoplasmic AHR protein may act as an adaptor of E3 ubiquitin ligase. In this study, the physiological functions of AHR that regulate cell proliferation were explored using the CRISPR/Cas9 system. The doubling-time of the AHR-KO clones of A549 and BEAS-2B was observed to be prolonged. The attenuation of proliferation potential was strongly associated with either the induction of p27Kip1 or the impairment in mitogenic signal transduction driven by the epidermal growth factor (EGF) and EGF receptor (EGFR). We found that the leucine-rich repeats and immunoglobulin-like domains 1 (LRIG1), a repressor of EGFR, was induced in the absence of AHR in vitro and in vivo. The LRIG1 tends to degrade via a proteasome dependent manner by interacting with AHR in wild-type cells. Either LRIG1 or a disintegrin and metalloprotease 17 (ADAM17) were accumulated in AHR-defective cells, consequently accelerating the degradation of EGFR, and attenuating the response to mitogenic stimulation. We also affirmed low AHR but high LRIG1 levels in lung tissues of chronic obstructive pulmonary disease (COPD) patients. This might partially elucidate the sluggish tissue repairment and developing inflammation in COPD patients.
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Affiliation(s)
- Han-Lin Hsu
- Division of Pulmonary Medicine, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei 116, Taiwan;
- Pulmonary Research Center, Wan Fang Hospital, Taipei Medical University, Taipei 116, Taiwan
- School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Hong-Kai Chen
- School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Department of Physiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Chi-Hao Tsai
- Department of Ophthalmology, University of North Carolina School of Medicine, Chapel Hill, NC 27517, USA;
| | - Po-Lin Liao
- Institute of Food Safety and Health Risk Assessment, School of Pharmaceutical Sciences, National Yang-Ming University, Taipei 112, Taiwan;
| | - Yen-Ju Chan
- Department of Physiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Yu-Cheng Lee
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Chen-Chen Lee
- Department of Microbiology and Immunology, School of Medicine, China Medicine University, Taichung 404, Taiwan;
| | - Ching-Hao Li
- Department of Physiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
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13
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Meng C, Gu L, Li Y, Li R, Cao Y, Li Z, Allen EG, Zhu D, Jin P. Ten-eleven translocation 2 modulates allergic inflammation by 5-hydroxymethylcytosine remodeling of immunologic pathways. Hum Mol Genet 2021; 30:1985-1995. [PMID: 34165552 DOI: 10.1093/hmg/ddab167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 06/16/2021] [Accepted: 06/17/2021] [Indexed: 02/02/2023] Open
Abstract
Allergic rhinitis (AR) is an allergen specific IgE-mediated inflammatory disease. Both genetic and environmental factors could play a role in the pathophysiology of AR. 5-methylcytosine (5-mC) can be converted to 5-hydroxymethylcytosine (5hmC) by the Ten-Eleven Translocation (TET) family of proteins as part of active DNA de-methylation pathway. 5hmC plays an important role in regulation of gene expression and differentiation in immune cells. Here we show that loss of ten-eleven translocation protein 2 (Tet2) could impact the severity of AR in the ovalbumin-induced mouse model. Genome-wide 5hmC profiling of both wildtype and Tet2 KO mice in response to AR revealed that the loss of Tet2 could lead to 5hmC alteration at specific immune response genes. Both partial loss and complete loss of Tet2 alters the 5hmC dynamic remodeling for the adaptive immune pathway, as well as cytokines. Thus, our results reveal a new role of Tet2 in immunology, and Tet2 may serve as a promising target in regulating the level of immune response.
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Affiliation(s)
- Cuida Meng
- Department of Otolaryngology Head and Neck Surgery, China-Japan Union of Jilin University, Changchun, China.,Jilin provincial Key Laboratory of Precise Diagnosis and Treatment of Upper Airway Allergic Diseases, China
| | - Lei Gu
- Affiliated First hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Yujing Li
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Ronghua Li
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Yiqu Cao
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Ziyi Li
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Emily G Allen
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Dongdong Zhu
- Department of Otolaryngology Head and Neck Surgery, China-Japan Union of Jilin University, Changchun, China.,Jilin provincial Key Laboratory of Precise Diagnosis and Treatment of Upper Airway Allergic Diseases, China
| | - Peng Jin
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322, USA
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14
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Zhu T, Zhang X, Chen X, Brown AP, Weirauch MT, Guilbert TW, Khurana Hershey GK, Biagini JM, Ji H. Nasal DNA methylation differentiates severe from non-severe asthma in African-American children. Allergy 2021; 76:1836-1845. [PMID: 33175399 PMCID: PMC8110596 DOI: 10.1111/all.14655] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 10/12/2020] [Accepted: 10/16/2020] [Indexed: 12/15/2022]
Abstract
BACKGROUND Asthma is highly heterogeneous, and severity evaluation is key to asthma management. DNA methylation (DNAm) contributes to asthma pathogenesis. This study aimed to identify nasal epithelial DNAm differences between severe and nonsevere asthmatic children and evaluate the impact of environmental exposures. METHODS Thirty-three nonsevere and 22 severe asthmatic African American children were included in an epigenome-wide association study. Genome-wide nasal epithelial DNAm and gene expression were measured. CpG sites associated with asthma severity and environmental exposures and predictive of severe asthma were identified. DNAm was correlated with gene expression. Enrichment for transcription factor (TF) binding sites or histone modifications surrounding DNAm differences were determined. RESULTS We identified 816 differentially methylated CpG positions (DMPs) and 10 differentially methylated regions (DMRs) associated with asthma severity. Three DMPs exhibited discriminatory ability for severe asthma. Intriguingly, six DMPs were simultaneously associated with asthma, allergic asthma, total IgE, environmental IgE, and FeNO in an independent cohort of children. Twenty-seven DMPs were associated with traffic-related air pollution or secondhand smoke. DNAm at 22 DMPs was altered by diesel particles or allergen in human bronchial epithelial cells. DNAm levels at 39 DMPs were correlated with mRNA expression. Proximal to 816 DMPs, three histone marks and several TFs involved in asthma pathogenesis were enriched. CONCLUSIONS Significant differences in nasal epithelial DNAm were observed between nonsevere and severe asthma in African American children, a subset of which may be useful to predict disease severity. These CpG sites are subjected to the influences of environmental exposures and may regulate gene expression.
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Affiliation(s)
- Tao Zhu
- California National Primate Research Center, Davis, CA
| | - Xue Zhang
- Division of Human Genetics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Xiaoting Chen
- Center for Autoimmune Genomics and Etiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | | | - Matthew T. Weirauch
- Center for Autoimmune Genomics and Etiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
- Divisions of Biomedical Informatics and Developmental Biology, Cincinnati, Ohio
- Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio
| | - Theresa W. Guilbert
- Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio
- Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Gurjit K. Khurana Hershey
- Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio
- Divison of Asthma Research, Cincinnati Children’s Hospital Medical Center, Davis, CA
| | - Jocelyn M. Biagini
- Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio
- Divison of Asthma Research, Cincinnati Children’s Hospital Medical Center, Davis, CA
| | - Hong Ji
- California National Primate Research Center, Davis, CA
- Department of Anatomy, Physiology and Cell biology, School of Veterinary Medicine, University of California, Davis, CA
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15
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Alashkar Alhamwe B, Alhamdan F, Ruhl A, Potaczek DP, Renz H. The role of epigenetics in allergy and asthma development. Curr Opin Allergy Clin Immunol 2021; 20:48-55. [PMID: 31633569 DOI: 10.1097/aci.0000000000000598] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
PURPOSE OF REVIEW Epigenetic mechanisms are known to play a crucial role in the pathogenesis of asthma, allergic rhinitis, atopic dermatitis, food allergy, and other allergic disorders, especially through mediating the effects of the environmental factors, well recognized allergy-risk modifiers. The aim of this work was to provide a concise but comprehensive review of the recent progress in the epigenetics of allergic diseases. RECENT FINDINGS Recent few years have substantially expanded our knowledge on the role of epigenetics in the pathogenesis and clinical picture of allergies. Specifically, it has been shown that epigenetic marks, especially DNA methylation, possess a diagnostic potential for atopic sensitization, asthma, allergic rhinitis, and food allergy. DNA methylation can be a predictor of clinical responses in controlled allergen challenges, including oral food challenges. Furthermore, direct or indirect targeting epigenetic mechanisms, this time especially histone modifications, was able to favorably affect expression of the genes underlying allergies and generally improve airway biology in allergic diseases or their animal models. SUMMARY Further studies are needed to explore the diagnostic and therapeutic potential of epigenetic modifications in allergies and to develop respective clinical tools.
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Affiliation(s)
- Bilal Alashkar Alhamwe
- Institute of Laboratory Medicine, Member of the German Center for Lung Research (DZL) and the Universities of Giessen and Marburg Lung Center (UGMLC), Philipps-University Marburg, Marburg, Germany.,International Inflammation (in-VIVO) Network, Worldwide Universities Network (WUN), West New York, New Jersey, USA.,College of Pharmacy, International University for Science and Technology (IUST), Daraa, Syria
| | - Fahd Alhamdan
- Institute of Laboratory Medicine, Member of the German Center for Lung Research (DZL) and the Universities of Giessen and Marburg Lung Center (UGMLC), Philipps-University Marburg, Marburg, Germany
| | - Andreas Ruhl
- Institute of Laboratory Medicine, Member of the German Center for Lung Research (DZL) and the Universities of Giessen and Marburg Lung Center (UGMLC), Philipps-University Marburg, Marburg, Germany
| | - Daniel P Potaczek
- Institute of Laboratory Medicine, Member of the German Center for Lung Research (DZL) and the Universities of Giessen and Marburg Lung Center (UGMLC), Philipps-University Marburg, Marburg, Germany.,International Inflammation (in-VIVO) Network, Worldwide Universities Network (WUN), West New York, New Jersey, USA.,John Paul II Hospital, Krakow, Poland
| | - Harald Renz
- Institute of Laboratory Medicine, Member of the German Center for Lung Research (DZL) and the Universities of Giessen and Marburg Lung Center (UGMLC), Philipps-University Marburg, Marburg, Germany.,International Inflammation (in-VIVO) Network, Worldwide Universities Network (WUN), West New York, New Jersey, USA
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16
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Li H, Li J, Lu T, Chen D, Xu R, Sun W, Luo X, Li H, Ma R, Wen W. DZNep attenuates allergic airway inflammation in an ovalbumin-induced murine model. Mol Immunol 2020; 131:60-67. [PMID: 33358566 DOI: 10.1016/j.molimm.2020.12.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 11/23/2020] [Accepted: 12/04/2020] [Indexed: 12/23/2022]
Abstract
BACKGROUND Growing evidence shows that enhancer of zeste homolog 2 (EZH2) plays a role in various physiological functions and cancer pathogenesis. However, its contribution to allergic diseases remains controversial. We sought to investigate the role of EZH2 in the pathogenesis of allergic airway inflammation. METHODS 3-Deazaneplanocin A (DZNep), an indirect inhibitor of EZH2, was administered via intraperitoneal injection in an ovalbumin (OVA)-induced murine model of allergic airway inflammation. The expression of EZH2 in the allergic airway tissues was examined by immunohistochemistry (IHC) and western blot. The inflammatory cell infiltration and the goblet cell hyperplasia in the murine nose and lung were detected by hematoxylin and eosin (H&E) staining and periodic acid-Schiff (PAS) staining. Levels of cytokines, including IL-4, IFN-γ, IL-6, and IL-10, were evaluated in the bronchoalveolar lavage fluid (BALF) using Enzyme-linked immune sorbent assay (ELISA). RESULTS EZH2 expression was inhibited by DZNep treatment (P < 0.05). The administration of DZNep significantly inhibited the inflammatory cell infiltration (P < 0.0001) and goblet cell hyperplasia (P < 0.001). Moreover, it suppressed the secretion of IL-4 (P < 0.0001) and IL-6 (P < 0.01) in the BALF. CONCLUSIONS Our findings demonstrate that DZNep attenuates allergic airway inflammation and could be a new therapeutic option for allergic rhinitis and asthma.
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Affiliation(s)
- Hang Li
- Department of Otolaryngology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Otorhinolaryngology Institute, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Jian Li
- Department of Otolaryngology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Otorhinolaryngology Institute, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Tong Lu
- Department of Otolaryngology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Otorhinolaryngology Institute, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Dehua Chen
- Department of Otolaryngology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Otorhinolaryngology Institute, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Rui Xu
- Department of Otolaryngology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Otorhinolaryngology Institute, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Wei Sun
- Department of Otolaryngology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Otorhinolaryngology Institute, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Xi Luo
- Department of Otolaryngology, Affiliated Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Huabin Li
- Department of Otolaryngology, Head and Neck Surgery, Affiliated Eye, Ear, Nose and Throat Hospital, Fudan University, Shanghai, China.
| | - Renqiang Ma
- Department of Otolaryngology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Otorhinolaryngology Institute, Sun Yat-sen University, Guangzhou, Guangdong, China.
| | - Weiping Wen
- Department of Otolaryngology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Otorhinolaryngology Institute, Sun Yat-sen University, Guangzhou, Guangdong, China; Department of Otolaryngology, the Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
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17
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The Aryl Hydrocarbon Receptor in Asthma: Friend or Foe? Int J Mol Sci 2020; 21:ijms21228797. [PMID: 33233810 PMCID: PMC7699852 DOI: 10.3390/ijms21228797] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 11/18/2020] [Indexed: 12/14/2022] Open
Abstract
The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor that has emerged as an important player in asthma control. AhR is responsive to environmental molecules and endogenous or dietary metabolites and regulates innate and adaptive immune responses. Binding of this receptor by different ligands has led to seemingly opposite responses in different asthma models. In this review, we present two sides of the same coin, with the beneficial and deleterious roles of AhR evaluated using known endogenous or exogenous ligands, deficient mice or antagonists. On one hand, AhR has an anti-inflammatory role since its activation in dendritic cells blocks the generation of pro-inflammatory T cells or shifts macrophages toward an anti-inflammatory M2 phenotype. On the other hand, AhR activation by particle-associated polycyclic aromatic hydrocarbons from the environment is pro-inflammatory, inducing mucus hypersecretion, airway remodelling, dysregulation of antigen presenting cells and exacerbates asthma features. Data concerning the role of AhR in cells from asthmatic patients are also reviewed, since AhR could represent a potential target for therapeutic immunomodulation.
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18
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Li H, Ryu MH, Rider CF, Tse W, Clifford RL, Aristizabal MJ, Wen W, Carlsten C. Predominant DNMT and TET mediate effects of allergen on the human bronchial epithelium in a controlled air pollution exposure study. J Allergy Clin Immunol 2020; 147:1671-1682. [PMID: 33069714 DOI: 10.1016/j.jaci.2020.08.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 07/29/2020] [Accepted: 08/28/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND Epidemiological data show that traffic-related air pollution contributes to the increasing prevalence and severity of asthma. DNA methylation (DNAm) changes may elucidate adverse health effects of environmental exposures. OBJECTIVES We sought to assess the effects of allergen and diesel exhaust (DE) exposures on global DNAm and its regulation enzymes in human airway epithelium. METHODS A total of 11 participants, including 7 with and 4 without airway hyperresponsiveness, were recruited for a randomized, double-blind crossover study. Each participant had 3 exposures: filtered air + saline, filtered air + allergen, and DE + allergen. Forty-eight hours postexposure, endobronchial biopsies and bronchoalveolar lavages were collected. Levels of DNA methyltransferases (DNMTs) and ten-eleven translocation (TET) enzymes, 5-methylcytosine, and 5-hydroxymethylcytosine were determined by immunohistochemistry. Cytokines and chemokines in bronchoalveolar lavages were measured by electrochemiluminescence multiplex assays. RESULTS Predominant DNMT (the most abundant among DNMT1, DNMT3A, and DNMT3B) and predominant TET (the most abundant among TET1, TET2, and TET3) were participant-dependent. 5-Methylcytosine and its regulation enzymes differed between participants with and without airway hyperresponsiveness at baseline (filtered air + saline) and in response to allergen challenge (regardless of DE exposure). Predominant DNMT and predominant TET correlated with lung function. Allergen challenge effect on IL-8 in bronchoalveolar lavages was modified by TET2 baseline levels in the epithelium. CONCLUSIONS Response to allergen challenge is associated with key DNAm regulation enzymes. This relationship is generally unaltered by DE coexposure but is rather dependent on airway hyperresponsiveness status. These enzymes therefore warranted further inquiry regarding their potential in diagnosis, prognosis, and treatment of asthma.
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Affiliation(s)
- Hang Li
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China; Air Pollution Exposure Laboratory, Department of Medicine, Division of Respiratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Min Hyung Ryu
- Air Pollution Exposure Laboratory, Department of Medicine, Division of Respiratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Christopher F Rider
- Air Pollution Exposure Laboratory, Department of Medicine, Division of Respiratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Wayne Tse
- Air Pollution Exposure Laboratory, Department of Medicine, Division of Respiratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Rachel L Clifford
- Nottingham NIHR Biomedical Research Centre, Nottingham MRC Molecular Pathology Node, Division of Respiratory Medicine, University of Nottingham, Nottingham University Hospitals NHS Trust, City Hospital, Nottingham, United Kingdom
| | - Maria J Aristizabal
- Centre for Molecular Medicine and Therapeutics, BC Children's Hospital Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada; Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada; Child and Brain Development Program, Canadian Institute for Advanced Research (CIFAR), Toronto, Ontario, Canada
| | - Weiping Wen
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
| | - Chris Carlsten
- Air Pollution Exposure Laboratory, Department of Medicine, Division of Respiratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada.
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19
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Sugita K, Soyka MB, Wawrzyniak P, Rinaldi AO, Mitamura Y, Akdis M, Akdis CA. Outside-in hypothesis revisited: The role of microbial, epithelial, and immune interactions. Ann Allergy Asthma Immunol 2020; 125:517-527. [PMID: 32454094 DOI: 10.1016/j.anai.2020.05.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/14/2020] [Accepted: 05/17/2020] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Our understanding of the origin of allergic diseases has increased in recent years, highlighting the importance of microbial dysbiosis and epithelial barrier dysfunction in affected tissues. Exploring the microbial-epithelial-immune crosstalk underlying the mechanisms of allergic diseases will allow the development of novel prevention and treatment strategies for allergic diseases. DATA SOURCES This review summarizes the recent advances in microbial, epithelial, and immune interactions in atopic dermatitis, allergic rhinitis, chronic rhinosinusitis, and asthma. STUDY SELECTIONS We performed a literature search, identifying relevant recent primary articles and review articles. RESULTS Dynamic crosstalk between the environmental factors and microbial, epithelial, and immune cells in the development of atopic dermatitis, allergic rhinitis, chronic rhinosinusitis, and asthma underlies the pathogenesis of these diseases. There is substantial evidence in the literature suggesting that environmental factors directly affect barrier function of the epithelium. In addition, T-helper 2 (TH2) cells, type 2 innate lymphoid cells, and their cytokine interleukin 13 (IL-13) damage skin and lung barriers. The effects of environmental factors may at least in part be mediated by epigenetic mechanisms. Histone deacetylase activation by type 2 immune response has a major effect on leaky barriers and blocking of histone deacetylase activity corrects the defective barrier in human air-liquid interface cultures and mouse models of allergic asthma with rhinitis. We also present and discuss a novel device to detect and monitor skin barrier dysfunction, which provides an opportunity to rapidly and robustly assess disease severity. CONCLUSION A complex interplay between environmental factors, epithelium, and the immune system is involved in the development of systemic allergic diseases.
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Affiliation(s)
- Kazunari Sugita
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zurich, Davos, Switzerland; Christine Kühne-Center for Allergy Research and Education, Davos, Switzerland; Division of Dermatology, Department of Medicine of Sensory and Motor Organs, Faculty of Medicine, Tottori University, Yonago, Japan.
| | - Michael B Soyka
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zurich, Davos, Switzerland; Department of Otorhinolaryngology, Head and Neck Surgery, University and University Hospital of Zurich, Zurich, Switzerland
| | - Paulina Wawrzyniak
- Division of Clinical Chemistry and Biochemistry and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Arturo O Rinaldi
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zurich, Davos, Switzerland
| | - Yasutaka Mitamura
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zurich, Davos, Switzerland; Christine Kühne-Center for Allergy Research and Education, Davos, Switzerland
| | - Mübeccel Akdis
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zurich, Davos, Switzerland
| | - Cezmi A Akdis
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zurich, Davos, Switzerland; Christine Kühne-Center for Allergy Research and Education, Davos, Switzerland
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20
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Zhu T, Brown AP, Ji H. The Emerging Role of Ten-Eleven Translocation 1 in Epigenetic Responses to Environmental Exposures. Epigenet Insights 2020; 13:2516865720910155. [PMID: 32166220 PMCID: PMC7054729 DOI: 10.1177/2516865720910155] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 02/10/2020] [Indexed: 12/11/2022] Open
Abstract
Mounting evidence from epidemiological studies and animal models has linked exposures to environmental factors to changes in epigenetic markers, especially in DNA methylation. These epigenetic changes may lead to dysregulation of molecular processes and functions and mediate the impact of environmental exposures in complex diseases. However, detailed molecular events that result in epigenetic changes following exposures remain unclear. Here, we review the emerging evidence supporting a critical role of ten-eleven translocation 1 (TET1) in mediating these processes. Targeting TET1 and its associated pathways may have therapeutic potential in alleviating negative impacts of environmental exposures, preventing and treating exposure-related diseases.
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Affiliation(s)
- Tao Zhu
- California National Primate Research
Center, University of California, Davis, Davis, CA, USA
| | - Anthony P Brown
- California National Primate Research
Center, University of California, Davis, Davis, CA, USA
| | - Hong Ji
- California National Primate Research
Center, University of California, Davis, Davis, CA, USA
- Department of Anatomy, Physiology &
Cell Biology, School of Veterinary Medicine, University of California, Davis, CA,
USA
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21
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Kabesch M, Tost J. Recent findings in the genetics and epigenetics of asthma and allergy. Semin Immunopathol 2020; 42:43-60. [PMID: 32060620 PMCID: PMC7066293 DOI: 10.1007/s00281-019-00777-w] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 12/22/2019] [Indexed: 12/16/2022]
Abstract
In asthma and allergy genetics, a trend towards a few main topics developed over the last 2 years. First, a number of studies have been published recently which focus on overlapping and/or very specific phenotypes: within the allergy spectrum but also reaching beyond, looking for common genetic traits shared between different diseases or disease entities. Secondly, an urgently needed focus has been put on asthma and allergy genetics in populations genetically different from European ancestry. This acknowledges that the majority of new asthma patients today are not white and asthma is a truly worldwide disease. In epigenetics, recent years have seen several large-scale epigenome-wide association studies (EWAS) being published and a further focus was on the interaction between the environment and epigenetic signatures. And finally, the major trends in current asthma and allergy genetics and epigenetics comes from the field of pharmacogenetics, where it is necessary to understand the susceptibility for and mechanisms of current asthma and allergy therapies while at the same time, we need to have scientific answers to the recent availability of novel drugs that hold the promise for a more individualized therapy.
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Affiliation(s)
- Michael Kabesch
- Department of Pediatric Pneumology and Allergy, St. Hedwig's Hospital of the order of St. John, University Children's Hospital Regensburg (KUNO), Steinmetzstr. 1-3, 93049, Regensburg, Germany.
| | - Jörg Tost
- Laboratory for Epigenetics and Environment, Centre National de Recherche en Génomique Humaine, CEA - Institut de Biologie François Jacob, 2 rue Gaston Crémieux, 91000, Evry, France
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Potaczek DP, Miethe S, Schindler V, Alhamdan F, Garn H. Role of airway epithelial cells in the development of different asthma phenotypes. Cell Signal 2020; 69:109523. [PMID: 31904412 DOI: 10.1016/j.cellsig.2019.109523] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 12/30/2019] [Accepted: 12/31/2019] [Indexed: 01/06/2023]
Abstract
The term (bronchial) asthma describes a disorder syndrome that comprises several disease phenotypes, all characterized by chronic inflammation in the bronchial epithelium, with a variety of subsequent functional consequences. Thus, the epithelium in the conducting airways is the main localization of the complex pathological changes in the disease. In this regard, bronchial epithelial cells are not passively affected by inflammatory mechanisms induced by immunological processes but rather actively involved in all steps of disease development from initiation and perpetuation to chronification. In recent years it turned out that bronchial epithelial cells show a high level of structural and functional diversity and plasticity with epigenetic mechanisms playing a crucial role in the regulation of these processes. Thus, it is quite reasonable that differential functional activities of the bronchial epithelium are involved in the development of different asthma phenotypes and/or stages of disease. The current knowledge on this topic will be discussed in this review article.
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Affiliation(s)
- Daniel P Potaczek
- Institute of Laboratory Medicine and Pathobiochemistry - Molecular Diagnostics, Philipps University of Marburg - Medical Faculty, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Marburg, Germany; John Paul II Hospital, Krakow, Poland
| | - Sarah Miethe
- Institute of Laboratory Medicine and Pathobiochemistry - Molecular Diagnostics, Philipps University of Marburg - Medical Faculty, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Marburg, Germany
| | - Viktoria Schindler
- Institute of Laboratory Medicine and Pathobiochemistry - Molecular Diagnostics, Philipps University of Marburg - Medical Faculty, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Marburg, Germany
| | - Fahd Alhamdan
- Institute of Laboratory Medicine and Pathobiochemistry - Molecular Diagnostics, Philipps University of Marburg - Medical Faculty, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Marburg, Germany
| | - Holger Garn
- Institute of Laboratory Medicine and Pathobiochemistry - Molecular Diagnostics, Philipps University of Marburg - Medical Faculty, Universities of Giessen and Marburg Lung Center (UGMLC), German Center for Lung Research (DZL), Marburg, Germany.
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Down-regulation of Tet2 is associated with Foxp3 TSDR hypermethylation in regulatory T cell of allergic rhinitis. Life Sci 2020; 241:117101. [DOI: 10.1016/j.lfs.2019.117101] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 11/13/2019] [Accepted: 11/22/2019] [Indexed: 12/11/2022]
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Li H, Lu T, Sun W, Ma R, Zhong H, Wei Y, Chen D, Wen Y, Carlsten C, Wen W. Ten-Eleven Translocation (TET) Enzymes Modulate the Activation of Dendritic Cells in Allergic Rhinitis. Front Immunol 2019; 10:2271. [PMID: 31616436 PMCID: PMC6775386 DOI: 10.3389/fimmu.2019.02271] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 09/09/2019] [Indexed: 12/11/2022] Open
Abstract
Background: The prevalence of allergic rhinitis (AR) has increased in recent decades. Accumulating evidence indicates that aberrant DNA demethylation modulated by enzymes of ten-eleven translocation (TET) promotes an imbalanced immune response. Objective: This study aimed to explore TETs on the activation of dendritic cells (DCs) in AR. Methods: The levels of TETs in peripheral blood mononuclear cells (PBMCs), peripheral myeloid DCs (mDCs), and plasmacytoid DCs (pDCs) from house dust mite (HDM)-sensitive AR patients and healthy volunteers (HC) were evaluated by qPCR and flow cytometry. The levels of 5-hydroxymethylcytosine (5hmC) and 5-methylcytosine (5mC) in PBMCs were determined by DNA-5hmC and DNA-5mC ELISA. The major HDM allergen, Dermatophagoides pteronyssinus (Der p 1), was used to stimulate atopic monocyte-derived DCs (moDCs) to assess its effect on the TETs. TET1 knockdown effect on the activation of non-atopic and atopic moDCs was investigated. Results: TETs and global 5hmC were higher in PBMCs of AR than HC. So was TET1 in peripheral mDCs and pDCs of AR. In vitro, TET1 in atopic moDCs was significantly decreased by allergen challenge. Knockdown of TET1 in moDCs tended to induce CD86, CD80, and CD40 in AR but not in HC. TET1-knockdown moDCs significantly decreased the differentiation of activated regulatory T cells in AR. Conclusion: DCs from AR patients express higher TET1 and are susceptible to be activated by TET1 decrease, which can be triggered by allergen challenge. Collectively, this suggests a role for TET in the pathogenesis of AR and potential for novel TET1-related, preventive, and therapeutic targets.
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Affiliation(s)
- Hang Li
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Tong Lu
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Wei Sun
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Renqiang Ma
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Hua Zhong
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yi Wei
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Dehua Chen
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yihui Wen
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Chris Carlsten
- Air Pollution Exposure Laboratory, Division of Respiratory Medicine, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Weiping Wen
- Department of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangzhou Key Laboratory of Otorhinolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
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