1
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Schichlein KD, Smith GJ, Jaspers I. Protective effects of inhaled antioxidants against air pollution-induced pathological responses. Respir Res 2023; 24:187. [PMID: 37443038 DOI: 10.1186/s12931-023-02490-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 07/06/2023] [Indexed: 07/15/2023] Open
Abstract
As the public health burden of air pollution continues to increase, new strategies to mitigate harmful health effects are needed. Dietary antioxidants have previously been explored to protect against air pollution-induced lung injury producing inconclusive results. Inhaled (pulmonary or nasal) administration of antioxidants presents a more promising approach as it could directly increase antioxidant levels in the airway surface liquid (ASL), providing protection against oxidative damage from air pollution. Several antioxidants have been shown to exhibit antioxidant, anti-inflammatory, and anti-microbial properties in in vitro and in vivo models of air pollution exposure; however, little work has been done to translate these basic research findings into practice. This narrative review summarizes these findings and data from human studies using inhaled antioxidants in response to air pollution, which have produced positive results, indicating further investigation is warranted. In addition to human studies, cell and murine studies should be conducted using more relevant models of exposure such as air-liquid interface (ALI) cultures of primary cells and non-aqueous apical delivery of antioxidants and pollutants. Inhalation of antioxidants shows promise as a protective intervention to prevent air pollution-induced lung injury and exacerbation of existing lung disease.
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Affiliation(s)
- Kevin D Schichlein
- Curriculum in Toxicology and Environmental Medicine, University of North Carolina at Chapel Hill, 116 Manning Drive, Chapel Hill, NC, 27599-7310, USA
| | - Gregory J Smith
- Curriculum in Toxicology and Environmental Medicine, University of North Carolina at Chapel Hill, 116 Manning Drive, Chapel Hill, NC, 27599-7310, USA
- Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Ilona Jaspers
- Curriculum in Toxicology and Environmental Medicine, University of North Carolina at Chapel Hill, 116 Manning Drive, Chapel Hill, NC, 27599-7310, USA.
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
- Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
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2
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Virk R, Buddenbaum N, Al-Shaer A, Armstrong M, Manke J, Reisdorph N, Sergin S, Fenton JI, Wallace ED, Ehrmann BM, Lovins HB, Gowdy KM, Smith MR, Smith GJ, Kelada SN, Shaikh SR. Obesity reprograms the pulmonary polyunsaturated fatty acid-derived lipidome, transcriptome, and gene-oxylipin networks. J Lipid Res 2022; 63:100267. [PMID: 36028048 PMCID: PMC9508350 DOI: 10.1016/j.jlr.2022.100267] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 07/27/2022] [Accepted: 08/14/2022] [Indexed: 01/13/2023] Open
Abstract
Obesity exacerbates inflammation upon lung injury; however, the mechanisms by which obesity primes pulmonary dysregulation prior to external injury are not well studied. Herein, we tested the hypothesis that obesity dysregulates pulmonary PUFA metabolism that is central to inflammation initiation and resolution. We first show that a high-fat diet (HFD) administered to C57BL/6J mice increased the relative abundance of pulmonary PUFA-containing triglycerides and the concentration of PUFA-derived oxylipins (particularly prostaglandins and hydroxyeicosatetraenoic acids), independent of an increase in total pulmonary PUFAs, prior to onset of pulmonary inflammation. Experiments with a genetic model of obesity (ob/ob) generally recapitulated the effects of the HFD on the pulmonary oxylipin signature. Subsequent pulmonary next-generation RNA sequencing identified complex and unique transcriptional regulation with the HFD. We found the HFD increased pathways related to glycerophospholipid metabolism and immunity, including a unique elevation in B cell differentiation and signaling. Furthermore, we conducted computational integration of lipidomic with transcriptomic data. These analyses identified novel HFD-driven networks between glycerophospholipid metabolism and B cell receptor signaling with specific PUFA-derived pulmonary oxylipins. Finally, we confirmed the hypothesis by demonstrating that the concentration of pulmonary oxylipins, in addition to inflammatory markers, were generally increased in mice consuming a HFD upon ozone-induced acute lung injury. Collectively, these data show that a HFD dysregulates pulmonary PUFA metabolism prior to external lung injury, which may be a mechanism by which obesity primes the lungs to respond poorly to infectious and/or inflammatory challenges.
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Affiliation(s)
- Rafia Virk
- Department of Nutrition, Gillings School of Global Public Health and School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Nicole Buddenbaum
- Department of Nutrition, Gillings School of Global Public Health and School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Abrar Al-Shaer
- Department of Nutrition, Gillings School of Global Public Health and School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Michael Armstrong
- Department of Pharmaceutical Sciences, University of Colorado Denver Anschutz Medical Campus, Aurora, CO, USA
| | - Jonathan Manke
- Department of Pharmaceutical Sciences, University of Colorado Denver Anschutz Medical Campus, Aurora, CO, USA
| | - Nichole Reisdorph
- Department of Pharmaceutical Sciences, University of Colorado Denver Anschutz Medical Campus, Aurora, CO, USA
| | - Selin Sergin
- Department of Food Science and Human Nutrition, College of Agriculture and Natural Resources and College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan, USA
| | - Jenifer I. Fenton
- Department of Food Science and Human Nutrition, College of Agriculture and Natural Resources and College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan, USA
| | - E. Diane Wallace
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Brandie M. Ehrmann
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Hannah B. Lovins
- Division of Pulmonary, Critical Care and Sleep Medicine, The Ohio State University, Columbus, OH, USA
| | - Kymberly M. Gowdy
- Division of Pulmonary, Critical Care and Sleep Medicine, The Ohio State University, Columbus, OH, USA
| | - M Ryan Smith
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University, Atlanta, GA, USA,Atlanta Department of Veterans Affairs Medical Center, Decatur, GA, USA
| | - Gregory J. Smith
- Marsico Lung Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA,Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Samir N.P. Kelada
- Marsico Lung Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA,Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Saame Raza Shaikh
- Department of Nutrition, Gillings School of Global Public Health and School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA,For correspondence: Saame Raza Shaikh
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3
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Abstract
Ozone (O3), a criterion air pollutant produced as a product of internal combustion, generates increased inflammation, lung permeability, and airway hyperreactivity when exposed to rodents in laboratory settings. Airway hyperreactivity is defined as an exaggerated acute obstructive response of the airways to one or more nonspecific stimuli. Lung permeability is a measure of barrier functions that separate internal and external environments to limit access of pathogens and other noxious material. By modeling in vivo O3 exposure in rodents, this allows investigators to explore pulmonary and nonpulmonary O3 effects as a means of understanding its impact on human health and lung function. Furthermore, direct effects of O3 on epithelial permeability can be defined using in vitro exposures to airway epithelial cells. This chapter will focus on methods of generating O3 and then exposing rodents and cultured epithelial cells in laboratory settings.
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4
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Erickson MA, Banks WA, Baumann KK. Measurement of Blood-Brain Barrier Disruption in Mice Following Ozone Exposure Using Highly Sensitive Radiotracer Assays. Curr Protoc 2022; 2:e460. [PMID: 35730917 DOI: 10.1002/cpz1.460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Ozone is a widespread air toxicant. Although its primary target organ is the lungs, emerging evidence suggests that ozone also has harmful effects on the brain. The vascular blood-brain barrier (BBB), an endothelial interface that regulates passage of substances between the brain and peripheral tissues, is a likely mediator of ozone's adverse effects on the brain. Ozone can cause BBB disruption, a pathological state in which the BBB becomes leaky, resulting in the unregulated entry of circulating substances into the brain. BBB disruption can be detected using many methods, which each have their strengths and limitations. Recent data suggest that BBB disruption can occur in mice following ozone exposures, albeit at a low level. Therefore, robust and highly sensitive assays for BBB disruption are needed. Assays commonly used to detect BBB disruption, however, can be time consuming, lack sensitivity, and can be vulnerable to artifacts that are typically not addressed in the experimental design. Radiochemical assays are among the most sensitive and specific for detecting subtle disruptions of the BBB and require minimal sample processing for detection. Radiochemical assays can also be multiplexed to include radiotracer conjugates of large and small molecular weights, and the uptake of each of them can provide information about the severity and mechanism of BBB disruption. Here, we describe a protocol to use two of these radiotracer conjugates, 14 C-sucrose and 99m Tc- albumin, to measure BBB disruption following an acute exposure to ozone in mice. We provide the steps to expose mice acutely to ozone, to label albumin with 99m Tc-pertechnetate, and to measure BBB disruption by evaluating permeability to 99m Tc-albumin and 14 C-sucrose after ozone exposure. These methods can be adapted to different ozone exposure paradigms and to different rodent species/strains, allowing for the sensitive and rapid assessment of BBB disruption that is detectable in whole brains or in brain regions. © 2022 Wiley Periodicals LLC. Basic Protocol 1: Ozone exposures in mice Basic Protocol 2: Measurement of blood-brain barrier disruption by evaluating permeability to 14 C-sucrose and 99m Tc-albumin Support Protocol: Labeling of bovine serum albumin with 99m Tc.
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Affiliation(s)
- Michelle A Erickson
- Geriatric Research Education and Clinical Center (GRECC), VA Puget Sound Healthcare System, Seattle, Washington
- Department of Medicine - Division of Gerontology and Geriatric Medicine, University of Washington, Seattle, Washington
| | - William A Banks
- Geriatric Research Education and Clinical Center (GRECC), VA Puget Sound Healthcare System, Seattle, Washington
- Department of Medicine - Division of Gerontology and Geriatric Medicine, University of Washington, Seattle, Washington
| | - Kristen K Baumann
- Geriatric Research Education and Clinical Center (GRECC), VA Puget Sound Healthcare System, Seattle, Washington
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5
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Tovar A, Crouse WL, Smith GJ, Thomas JM, Keith BP, McFadden KM, Moran TP, Furey TS, Kelada SNP. Integrative analysis reveals mouse strain-dependent responses to acute ozone exposure associated with airway macrophage transcriptional activity. Am J Physiol Lung Cell Mol Physiol 2022; 322:L33-L49. [PMID: 34755540 PMCID: PMC8721896 DOI: 10.1152/ajplung.00237.2021] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 11/03/2021] [Accepted: 11/04/2021] [Indexed: 01/03/2023] Open
Abstract
Acute ozone (O3) exposure is associated with multiple adverse cardiorespiratory outcomes, the severity of which varies across individuals in human populations and inbred mouse strains. However, molecular determinants of response, including susceptibility biomarkers that distinguish who will develop severe injury and inflammation, are not well characterized. We and others have demonstrated that airway macrophages (AMs) are an important resident immune cell type that are functionally and transcriptionally responsive to O3 inhalation. Here, we sought to explore influences of strain, exposure, and strain-by-O3 exposure interactions on AM gene expression and identify transcriptional correlates of O3-induced inflammation and injury across six mouse strains, including five Collaborative Cross (CC) strains. We exposed adult mice of both sexes to filtered air (FA) or 2 ppm O3 for 3 h and measured inflammatory and injury parameters 21 h later. Mice exposed to O3 developed airway neutrophilia and lung injury with strain-dependent severity. In AMs, we identified a common core O3 transcriptional response signature across all strains, as well as a set of genes exhibiting strain-by-O3 exposure interactions. In particular, a prominent gene expression contrast emerged between a low- (CC017/Unc) and high-responding (CC003/Unc) strain, as reflected by cellular inflammation and injury. Further inspection indicated that differences in their baseline gene expression and chromatin accessibility profiles likely contribute to their divergent post-O3 exposure transcriptional responses. Together, these results suggest that aspects of O3-induced respiratory responses are mediated through altered AM transcriptional signatures and further confirm the importance of gene-environment interactions in mediating differential responsiveness to environmental agents.
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Affiliation(s)
- Adelaide Tovar
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Genetics & Molecular Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Wesley L Crouse
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Bioinformatics & Computational Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Gregory J Smith
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Toxicology & Environmental Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Joseph M Thomas
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Benjamin P Keith
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Bioinformatics & Computational Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Kathryn M McFadden
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Timothy P Moran
- Department of Pediatrics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Center for Environmental Medicine, Asthma, and Lung Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Terrence S Furey
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Genetics & Molecular Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Bioinformatics & Computational Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Samir N P Kelada
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Genetics & Molecular Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Bioinformatics & Computational Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Curriculum in Toxicology & Environmental Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Center for Environmental Medicine, Asthma, and Lung Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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6
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Kong X, Bennett WC, Jania CM, Chason KD, German Z, Adouli J, Budney SD, Oby BT, van Heusden C, Lazarowski ER, Jaspers I, Randell SH, Hedgespeth BA, Cruse G, Hua X, Schworer SA, Smith GJ, Kelada SN, Tilley SL. Identification of an ATP/P2X7/mast cell pathway mediating ozone-induced bronchial hyperresponsiveness. JCI Insight 2021; 6:e140207. [PMID: 34546976 PMCID: PMC8663556 DOI: 10.1172/jci.insight.140207] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 09/16/2021] [Indexed: 11/20/2022] Open
Abstract
Ozone is a highly reactive environmental pollutant with well-recognized adverse effects on lung health. Bronchial hyperresponsiveness (BHR) is one consequence of ozone exposure, particularly for individuals with underlying lung disease. Our data demonstrated that ozone induced substantial ATP release from human airway epithelia in vitro and into the airways of mice in vivo and that ATP served as a potent inducer of mast cell degranulation and BHR, acting through P2X7 receptors on mast cells. Both mast cell-deficient and P2X7 receptor-deficient (P2X7-/-) mice demonstrated markedly attenuated BHR to ozone. Reconstitution of mast cell-deficient mice with WT mast cells and P2X7-/- mast cells restored ozone-induced BHR. Despite equal numbers of mast cells in reconstituted mouse lungs, mice reconstituted with P2X7-/- mast cells demonstrated significantly less robust BHR than mice reconstituted with WT mast cells. These results support a model where P2X7 on mast cells and other cell types contribute to ozone-induced BHR.
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Affiliation(s)
- Xiaomei Kong
- Department of Respiratory and Critical Care Medicine, The First Hospital of Shanxi Medical University, Taiyuan, China
| | - William C. Bennett
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Corey M. Jania
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Kelly D. Chason
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Zachary German
- Marsico Lung Institute and
- Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Jennifer Adouli
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Samuel D. Budney
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Brandon T. Oby
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Catharina van Heusden
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Eduardo R. Lazarowski
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Ilona Jaspers
- Department of Pediatrics and Center for Environmental Medicine, Asthma, and Lung Biology and
| | - Scott H. Randell
- Marsico Lung Institute and
- Department of Cell Biology and Physiology, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
| | - Barry A. Hedgespeth
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
| | - Glenn Cruse
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
| | - Xiaoyang Hua
- Department of Head and Neck Surgery & Communication Sciences, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Otolaryngology — Head and Neck Surgery, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Stephen A. Schworer
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
- Division of Allergy and Immunology, Department of Pediatrics, and
| | - Gregory J. Smith
- Department of Genetics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Samir N.P. Kelada
- Department of Genetics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Stephen L. Tilley
- Marsico Lung Institute and
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, North Carolina, USA
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7
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Smith GJ, Tovar A, Kanke M, Wang Y, Deshane JS, Sethupathy P, Kelada SNP. Ozone-induced changes in the murine lung extracellular vesicle small RNA landscape. Physiol Rep 2021; 9:e15054. [PMID: 34558223 PMCID: PMC8461034 DOI: 10.14814/phy2.15054] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 08/31/2021] [Accepted: 09/04/2021] [Indexed: 01/08/2023] Open
Abstract
Inhalation exposure to ozone (O3 ) causes adverse respiratory health effects that result from airway inflammation, a complex response mediated in part by changes to airway cellular transcriptional programs. These programs may be regulated by microRNAs transferred between cells (e.g., epithelial cells and macrophages) via extracellular vesicles (EV miRNA). To explore this, we exposed female C57BL/6J mice to filtered air (FA), 1, or 2 ppm O3 by inhalation and collected bronchoalveolar lavage fluid (BALF) 21 h later for markers of airway inflammation, EVs, and EV miRNA. Both concentrations of O3 significantly increased markers of inflammation (neutrophils), injury (total protein), and the number of EV-sized particles in the BALF. Imagestream analysis indicated a substantial portion of particles was positive for canonical EV markers (CD81, CD51), and Siglec-F, a marker of alveolar macrophages. Using high-throughput small RNA sequencing, we identified several differentially expressed (DE) BALF EV miRNAs after 1 ppm (16 DE miRNAs) and 2 ppm (99 DE miRNAs) O3 versus FA exposure. O3 concentration-response patterns in EV miRNA expression were apparent, particularly for miR-2137, miR-126-3p, and miR-351-5p. Integrative analysis of EV miRNA expression and airway cellular mRNA expression identified EV miR-22-3p as a candidate regulator of transcriptomic responses to O3 in airway macrophages. In contrast, we did not identify candidate miRNA regulators of mRNA expression data from conducting airways (predominantly composed of epithelial cells). In summary, our data show that O3 exposure alters EV release and EV miRNA expression, suggesting that further investigation of EVs may provide insight into their effects on airway macrophage function and other mechanisms of O3 -induced respiratory inflammation.
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Affiliation(s)
- Gregory J Smith
- Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Adelaide Tovar
- Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Matt Kanke
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
| | - Yong Wang
- Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Jessy S Deshane
- Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Praveen Sethupathy
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
| | - Samir N P Kelada
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
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8
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Sun N, Niu Y, Zhang R, Huang Y, Wang J, Qiu W, Zhang X, Han Z, Bao J, Zhu H, Duan Y, Kan H. Ozone inhalation induces exacerbation of eosinophilic airway inflammation and Th2-skew immune response in a rat model of AR. Biomed Pharmacother 2021; 137:111261. [PMID: 33482509 DOI: 10.1016/j.biopha.2021.111261] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 12/30/2020] [Accepted: 01/07/2021] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Ozone (O3) exposure elicits allergic rhinitis (AR) exacerbations by mechanisms that remain poorly understood. We used a rat model to investigate the effects of O3 on eosinophilic airway inflammation and Th2-related response. METHODS Sprague-Dawley (SD) rats were sensitized and challenged with ovalbumin (OVA) to make AR models. Three groups of AR rats were exposed respectively to 0.5, 1.0, 2.0 ppm of O3 for 2 h daily over 6 weeks consecutively and studied 24 h later. Normal rats exposed to O3 alone were used as controls. Nasal symptoms and OVA-specific immunoglobulin E (OVA-sIg E) in the serum were evaluated. Inflammatory cells in nasal lavage fluid (NLF) were classified and counted. Cytokines protein levels in NLF were assessed by ELISA. The pathological changes in the nasal mucosa were examined by histology. RESULTS The combination of allergen and repeated O3 exposure in rats induced a significant increase of the number of sneezes, nasal rubs, amount of nasal secretion and OVA-sIgE in the serum, accompanied by enhancement of eosinophils in NLF and nasal mucosa. The increase of interleukin-5 (IL-5), IL-13, Eotaxin and decrease of INF-γ protein levels in NLF were detected in AR rats after O3 inhalation. Hematoxylin and eosin staining showed disordered arrangement of the nasal mucosa epithelium and eosinophilic infiltration in a concentration-dependent manner. CONCLUSIONS O3 inhalation deteriorated symptoms in AR rats, and the possible mechanism is that ozone co-exposure could enhance the expression of Th2 cytokines, eosinophilic airway inflammation dose-dependently. The observation is helpful for us to understand the synergistic effect of O3 in the air pollution and allergen on aggravating allergic rhinitis.
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Affiliation(s)
- Na Sun
- Department of Otolaryngology, Huadong Hospital, Fudan University, Shanghai, China
| | - Yue Niu
- School of Public Health, Key Lab of Public Health Safety of the Ministry of Education and Key Lab of Health Technology Assessment of the Ministry of Health, Fudan University, Shanghai, China
| | - Ruxin Zhang
- Department of Otolaryngology, Huadong Hospital, Fudan University, Shanghai, China.
| | - Yu Huang
- Department of Otolaryngology, Huadong Hospital, Fudan University, Shanghai, China
| | - Jinchao Wang
- Department of Otolaryngology, Huadong Hospital, Fudan University, Shanghai, China
| | - Wenjia Qiu
- Department of Respiratory Medicine, Huadong Hospital, Fudan University, Shanghai, China
| | - Xueyan Zhang
- Department of Otolaryngology, Huadong Hospital, Fudan University, Shanghai, China
| | - Zhijin Han
- Department of Otolaryngology, Huadong Hospital, Fudan University, Shanghai, China
| | - Jing Bao
- Department of Otolaryngology, Huadong Hospital, Fudan University, Shanghai, China
| | - Huili Zhu
- Department of Respiratory Medicine, Huadong Hospital, Fudan University, Shanghai, China
| | - Yusen Duan
- Shanghai Environmental Monitoring Center, Shanghai, China
| | - Haidong Kan
- School of Public Health, Key Lab of Public Health Safety of the Ministry of Education and Key Lab of Health Technology Assessment of the Ministry of Health, Fudan University, Shanghai, China
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9
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Laudermilk LT, Tovar A, Homstad AK, Thomas JM, McFadden KM, Tune MK, Cowley DO, Mock JR, Ideraabdullah F, Kelada SNP. Baseline and innate immune response characterization of a Zfp30 knockout mouse strain. Mamm Genome 2020; 31:205-214. [PMID: 32860515 DOI: 10.1007/s00335-020-09847-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 08/17/2020] [Indexed: 12/01/2022]
Abstract
Airway neutrophilia is correlated with disease severity in a number of chronic and acute pulmonary diseases, and dysregulation of neutrophil chemotaxis can lead to host tissue damage. The gene Zfp30 was previously identified as a candidate regulator of neutrophil recruitment to the lungs and secretion of CXCL1, a potent neutrophil chemokine, in a genome-wide mapping study using the Collaborative Cross. ZFP30 is a putative transcriptional repressor with a KRAB domain capable of inducing heterochromatin formation. Using a CRISPR-mediated knockout mouse model, we investigated the role that Zfp30 plays in recruitment of neutrophils to the lung using models of allergic airway disease and acute lung injury. We found that the Zfp30 null allele did not affect CXCL1 secretion or neutrophil recruitment to the lungs in response to various innate immune stimuli. Intriguingly, despite the lack of neutrophil phenotype, we found there was a significant reduction in the proportion of live Zfp30 homozygous female mutant mice produced from heterozygous matings. This deviation from the expected Mendelian ratios implicates Zfp30 in fertility or embryonic development. Overall, our results indicate that Zfp30 is an essential gene but does not influence neutrophilic inflammation in this particular knockout model.
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Affiliation(s)
- Lucas T Laudermilk
- Department of Genetics, University of North Carolina, 120 Mason Farm Road, Chapel Hill, NC, 27599, USA.,Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC, USA
| | - Adelaide Tovar
- Department of Genetics, University of North Carolina, 120 Mason Farm Road, Chapel Hill, NC, 27599, USA.,Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC, USA
| | - Alison K Homstad
- Department of Genetics, University of North Carolina, 120 Mason Farm Road, Chapel Hill, NC, 27599, USA.,Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC, USA
| | - Joseph M Thomas
- Department of Genetics, University of North Carolina, 120 Mason Farm Road, Chapel Hill, NC, 27599, USA
| | - Kathryn M McFadden
- Department of Genetics, University of North Carolina, 120 Mason Farm Road, Chapel Hill, NC, 27599, USA
| | - Miriya K Tune
- Marsico Lung Institute, University of North Carolina, Chapel Hill, NC, USA
| | - Dale O Cowley
- Department of Genetics, University of North Carolina, 120 Mason Farm Road, Chapel Hill, NC, 27599, USA.,Animal Models Core Facility, University of North Carolina, Chapel Hill, NC, USA
| | - Jason R Mock
- Marsico Lung Institute, University of North Carolina, Chapel Hill, NC, USA
| | - Folami Ideraabdullah
- Department of Genetics, University of North Carolina, 120 Mason Farm Road, Chapel Hill, NC, 27599, USA.,Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC, USA.,Department of Nutrition, University of North Carolina, Chapel Hill, NC, USA
| | - Samir N P Kelada
- Department of Genetics, University of North Carolina, 120 Mason Farm Road, Chapel Hill, NC, 27599, USA. .,Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC, USA. .,Marsico Lung Institute, University of North Carolina, Chapel Hill, NC, USA.
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Tovar A, Smith GJ, Thomas JM, Crouse WL, Harkema JR, Kelada SNP. Transcriptional Profiling of the Murine Airway Response to Acute Ozone Exposure. Toxicol Sci 2020; 173:114-130. [PMID: 31626304 PMCID: PMC6944221 DOI: 10.1093/toxsci/kfz219] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Ambient ozone (O3) exposure has serious consequences on respiratory health, including airway inflammation and injury. Decades of research have yielded thorough descriptions of these outcomes; however, less is known about the molecular processes that drive them. The aim of this study was to further describe the cellular and molecular responses to O3 exposure in murine airways, with a particular focus on transcriptional responses in 2 critical pulmonary tissue compartments: conducting airways (CA) and airway macrophages (AM). After exposing adult, female C57BL/6J mice to filtered air, 1 or 2 ppm O3, we assessed hallmark responses including airway inflammation (cell counts and cytokine secretion) and injury (epithelial permeability), followed by gene expression profiling of CA and AM by RNA-seq. As expected, we observed concentration-dependent increases in airway inflammation and injury. Conducting airways and AM both exhibited changes in gene expression to both 1 and 2 ppm O3 that were largely compartment-specific. In CA, genes associated with epithelial barrier function, detoxification processes, and cellular proliferation were altered, while O3 affected genes involved in innate immune signaling, cytokine production, and extracellular matrix remodeling in AM. Further, CA and AM also exhibited notable differences in concentration-response expression patterns for large numbers of genes. Overall, our study has described transcriptional responses to acute O3 exposure, revealing both shared and unique gene expression patterns across multiple concentrations of O3 and in 2 important O3-responsive tissues. These profiles provide broad mechanistic insight into pulmonary O3 toxicity, and reveal a variety of targets for focused follow-up studies.
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Affiliation(s)
- Adelaide Tovar
- Department of Genetics
- Curriculum in Genetics & Molecular Biology
| | - Gregory J Smith
- Department of Genetics
- Curriculum in Toxicology & Environmental Medicine
| | | | - Wesley L Crouse
- Department of Genetics
- Curriculum in Bioinformatics & Computational Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Jack R Harkema
- Department of Pathology & Diagnostic Investigation and Institute for Integrated Toxicology, Michigan State University, East Lansing, Michigan 48824
| | - Samir N P Kelada
- Department of Genetics
- Curriculum in Genetics & Molecular Biology
- Curriculum in Toxicology & Environmental Medicine
- Curriculum in Bioinformatics & Computational Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
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