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Heires AJ, Samuelson D, Villageliu D, Nordgren TM, Romberger DJ. Agricultural dust derived bacterial extracellular vesicle mediated inflammation is attenuated by DHA. Sci Rep 2023; 13:2767. [PMID: 36797300 PMCID: PMC9933036 DOI: 10.1038/s41598-023-29781-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 02/10/2023] [Indexed: 02/18/2023] Open
Abstract
Dietary long-chain omega-3 polyunsaturated fatty acids (n-3 PUFA) and their pro-resolving metabolites are protective against atherosclerotic disease, and ameliorate systemic inflammatory conditions including lupus erythematosus, psoriasis, and bronchial asthma. Organic bioaerosol inhalation is a common and injurious hazard associated with agricultural occupations such as work in swine concentrated animal feeding operations (CAFOs) and is known to increase the risk for developing respiratory conditions such as asthma and COPD. Nearly all cells secrete membrane-bound vesicles (extracellular vesicles, EVs) that have the capacity to transmit protein, nucleic acid, and lipid signaling mediators between cells. Using a polymer-based isolation technique (ExoQuick, PEG) followed by ultracentrifugation, EVs were isolated from CAFO dust extracts, and were quantified and partially characterized. Here, we investigated the role of the n-3 PUFA docosahexaenoic acid (DHA) as a component of n-6 to n-3 PUFA mixtures used to recapitulate physiologically relevant dietary ratios in the resolution of inflammatory injury caused by exposure to EVs carried by agricultural organic dust in vitro. Primary human bronchial epithelial cells, fibroblasts and monocyte-derived macrophages were exposed to EVs isolated from swine CAFO dust. Cells were treated with mixtures of n-6 and n-3 PUFA during recovery from the EV-induced injury. CAFO dust extract (DE) was found to contain EVs that contributed significantly to the overall consequences of exposure to complete DE. DHA-rich PUFA ratios inhibited DE-derived EV-induced proinflammatory cytokine release dose-dependently. DHA-rich PUFA ratios also reversed the damaging effects of EVs on recellularization of lung matrix scaffolds, accelerated wound healing, and stimulated the release of pro-resolution mediators. These results underscore the importance of n-3 PUFA as anti-inflammatory compounds during recovery from EV-laden environmental dust exposure in the context of cellular responses in vitro, warranting future translational studies.
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Affiliation(s)
- Art J Heires
- Department of Internal Medicine, Pulmonary, Critical Care & Sleep division, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Derrick Samuelson
- Department of Internal Medicine, Pulmonary, Critical Care & Sleep division, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Daniel Villageliu
- Department of Internal Medicine, Pulmonary, Critical Care & Sleep division, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Tara M Nordgren
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO, USA
| | - Debra J Romberger
- VA Nebraska Western Iowa Health Care System, Omaha, NE, USA.
- Department of Internal Medicine, Pulmonary, Critical Care & Sleep division, University of Nebraska Medical Center, Omaha, NE, 68198, USA.
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Gribben KC, Poole JA, Nelson AJ, Farazi PA, Wichman CS, Heires AJ, Romberger DJ, LeVan TD. Relationships of serum CC16 levels with smoking status and lung function in COPD. Respir Res 2022; 23:247. [PMID: 36114505 PMCID: PMC9479424 DOI: 10.1186/s12931-022-02158-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 08/21/2022] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The club cell secretory protein (CC16) has anti-inflammatory and antioxidant effects, and low CC16 serum levels have been associated with both risk and progression of COPD, yet the interaction between smoking and CC16 on lung function outcomes remains unknown. METHODS Utilizing cross-sectional data on United States veterans, CC16 serum concentrations were measured by ELISA and log transformed for analyses. Spirometry was conducted and COPD status was defined by post-bronchodilator FEV1/FVC ratio < 0.7. Smoking measures were self-reported on questionnaire. Multivariable logistic and linear regression were employed to examine associations between CC16 levels and COPD, and lung function with adjustment for covariates. Unadjusted Pearson correlations described relationships between CC16 level and lung function measures, pack-years smoked, and years since smoking cessation. RESULTS The study population (N = 351) was mostly male, white, with an average age over 60 years. An interaction between CC16 and smoking status on FEV1/FVC ratio was demonstrated among subjects with COPD (N = 245, p = 0.01). There was a positive correlation among former smokers and negative correlation among current or never smokers with COPD. Among former smokers with COPD, CC16 levels were also positively correlated with years since smoking cessation, and inversely related with pack-years smoked. Increasing CC16 levels were associated with lower odds of COPD (ORadj = 0.36, 95% CI 0.22-0.57, Padj < 0.0001). CONCLUSIONS Smoking status is an important effect modifier of CC16 relationships with lung function. Increasing serum CC16 corresponded to increases in FEV1/FVC ratio in former smokers with COPD versus opposite relationships in current or never smokers. Additional longitudinal studies may be warranted to assess relationship of CC16 with smoking cessation on lung function among subjects with COPD.
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Affiliation(s)
- Kelli C. Gribben
- grid.266813.80000 0001 0666 4105Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE 68198 USA
| | - Jill A. Poole
- grid.266813.80000 0001 0666 4105Division of Allergy and Immunology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198 USA
| | - Amy J. Nelson
- grid.266813.80000 0001 0666 4105Division of Allergy and Immunology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198 USA
| | - Paraskevi A. Farazi
- grid.266813.80000 0001 0666 4105Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE 68198 USA
| | - Christopher S. Wichman
- grid.266813.80000 0001 0666 4105Department of Biostatistics, University of Nebraska Medical Center, Omaha, NE 68198 USA
| | - Art J. Heires
- grid.266813.80000 0001 0666 4105Division of Pulmonary, Critical Care and Sleep, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198 USA
| | - Debra J. Romberger
- grid.266813.80000 0001 0666 4105Division of Pulmonary, Critical Care and Sleep, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198 USA ,grid.478099.b0000 0004 0420 0296VA Nebraska Western Iowa Healthcare System, Omaha, NE 68105 USA
| | - Tricia D. LeVan
- grid.266813.80000 0001 0666 4105Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE 68198 USA ,grid.266813.80000 0001 0666 4105Division of Pulmonary, Critical Care and Sleep, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198 USA ,grid.478099.b0000 0004 0420 0296VA Nebraska Western Iowa Healthcare System, Omaha, NE 68105 USA
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Ulu A, Burr A, Heires AJ, Pavlik J, Larsen T, Perez PA, Bravo C, DiPatrizio NV, Baack M, Romberger DJ, Nordgren TM. A high docosahexaenoic acid diet alters lung inflammation and recovery following repetitive exposure to aqueous organic dust extracts. J Nutr Biochem 2021; 97:108797. [PMID: 34126202 PMCID: PMC8725620 DOI: 10.1016/j.jnutbio.2021.108797] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 12/15/2022]
Abstract
Agricultural workers, especially those who work in swine confinement facilities, are at increased risk for developing pulmonary diseases including asthma, chronic obstructive pulmonary disease, and chronic bronchitis due to exposures to fumes, vapors, and organic dust. Repetitive exposure to agricultural dust leads to unresolved inflammation, a common underlying mechanism that worsens lung disease. Besides occupational exposure to dusts, diet also significantly contributes to inflammation and disease progression. Since DHA (docosahexaenoic acid), a polyunsaturated omega-3 fatty acid and its bioactive metabolites have key roles in inflammation resolution, we rationalized that individuals chronically exposed to organic dusts can benefit from dietary modifications. Here, we evaluated the role of DHA in modifying airway inflammation in a murine model of repetitive exposure to an aqueous extract of agricultural dust (three-week exposure to swine confinement dust extract, HDE) and after a one-week resolution/recovery period. We found that mice fed a high DHA diet had significantly increased bronchoalveolar lavage fluid (BALF) levels of DHA-derived resolvins and lower TNFα along with altered plasma levels of endocannabinoids and related lipid mediators. Following the one-week recovery we identified significantly reduced BALF cellularity and cytokine/chemokine release along with increased BALF amphiregulin and resolvins in DHA diet-fed versus control diet-fed mice challenged with HDE. We further report observations on the effects of repetitive HDE exposure on lung Ym1+ and Arg-1+ macrophages. Overall, our findings support a protective role for DHA and identify DHA-derived resolvins and endocannabinoids among the potential mediators of DHA in altering airway inflammation in chronic agricultural dust exposure.
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Affiliation(s)
- Arzu Ulu
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, California, USA
| | - Abigail Burr
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, California, USA
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Jacqueline Pavlik
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Tricia Larsen
- Children's Health Research Center, Sanford Research, Sioux Falls, South Dakota, USA
| | - Pedro A Perez
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, California, USA
| | - Carissa Bravo
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, California, USA
| | - Nicholas V DiPatrizio
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, California, USA
| | - Michelle Baack
- Children's Health Research Center, Sanford Research, Sioux Falls, South Dakota, USA; Division of Neonatology, University of South Dakota-Sanford School of Medicine, Sioux Falls, South Dakota, USA
| | - Debra J Romberger
- VA Nebraska-Western Iowa Healthcare System, Omaha, Nebraska, USA; Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Tara M Nordgren
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, California, USA; Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska, USA.
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Poole JA, Nordgren TM, Heires AJ, Nelson AJ, Katafiasz D, Bailey KL, Romberger DJ. Amphiregulin modulates murine lung recovery and fibroblast function following exposure to agriculture organic dust. Am J Physiol Lung Cell Mol Physiol 2020; 318:L180-L191. [PMID: 31693392 PMCID: PMC6985879 DOI: 10.1152/ajplung.00039.2019] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 10/22/2019] [Accepted: 10/29/2019] [Indexed: 01/10/2023] Open
Abstract
Exposure to agricultural bioaerosols can lead to chronic inflammatory lung diseases. Amphiregulin (AREG) can promote the lung repair process but can also lead to fibrotic remodeling. The objective of this study was to determine the role of AREG in altering recovery from environmental dust exposure in a murine in vivo model and in vitro using cultured human and murine lung fibroblasts. C57BL/6 mice were intranasally exposed to swine confinement facility dust extract (DE) or saline daily for 1 wk or allowed to recover for 3-7 days while being treated with an AREG-neutralizing antibody or recombinant AREG. Treatment with the anti-AREG antibody prevented resolution of DE exposure-induced airway influx of total cells, neutrophils, and macrophages and increased levels of TNF-α, IL-6, and CXCL1. Neutrophils and activated macrophages (CD11c+CD11bhi) persisted after recovery in lung tissues of anti-AREG-treated mice. In murine and human lung fibroblasts, DE induced the release of AREG and inflammatory cytokines. Fibroblast recellularization of primary human lung mesenchymal matrix scaffolds and wound closure was inhibited by DE and enhanced with recombinant AREG alone. AREG treatment rescued the DE-induced inhibitory fibroblast effects. AREG intranasal treatment for 3 days during recovery phase reduced repetitive DE-induced airway inflammatory cell influx and cytokine release. Collectively, these studies demonstrate that inhibition of AREG reduced, whereas AREG supplementation promoted, the airway inflammatory recovery response following environmental bioaerosol exposure, and AREG enhanced fibroblast function, suggesting that AREG could be targeted in agricultural workers repetitively exposed to organic dust environments to potentially prevent and/or reduce disease.
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Affiliation(s)
- Jill A Poole
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Tara M Nordgren
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, California
| | - Art J Heires
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Amy J Nelson
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Dawn Katafiasz
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Kristina L Bailey
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska
| | - Debra J Romberger
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska
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Bailey KL, Wyatt TA, Katafiasz DM, Taylor KW, Heires AJ, Sisson JH, Romberger DJ, Burnham EL. Alcohol and cannabis use alter pulmonary innate immunity. Alcohol 2019; 80:131-138. [PMID: 30419300 DOI: 10.1016/j.alcohol.2018.11.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 10/19/2018] [Accepted: 11/03/2018] [Indexed: 11/30/2022]
Abstract
PURPOSE Cannabis use is increasing due to recent legislative changes. In addition, cannabis is often used in conjunction with alcohol. The airway epithelium is the first line of defense against infectious microbes. Toll-like receptors (TLR) recognize airborne microbes and initiate the inflammatory cytokine response. The mechanism by which cannabis use in conjunction with alcohol affects pulmonary innate immunity mediated by TLRs is unknown. METHODS Samples and data from an existing cohort of individuals with alcohol use disorders (AUDs), along with samples from additional participants with cannabis use alone and with AUD were utilized. Subjects were categorized into the following groups: no alcohol use disorder (AUD) or cannabis use (control) (n = 46), AUD only (n = 29), cannabis use-only (n = 39), and AUD and cannabis use (n = 29). The participants underwent bronchoscopy with bronchoalveolar lavage (BAL) and airway epithelial brushings. We measured IL-6, IL-8, TNF⍺, and IL-10 levels in BAL fluid, and performed real-time PCR for TLR1-9 on the airway epithelial brushings. RESULTS We found significant increases in TLR2 with AUD alone, cannabis use alone, and cannabis use with AUD, compared to control. TLR5 was increased in cannabis users compared to control, TLR6 was increased in cannabis users and cannabis users with AUD compared to control, TLR7 was increased in cannabis users compared to control, and TLR9 was increased in cannabis users compared to control. In terms of cytokine production, IL-6 was increased in cannabis users compared to control. IL-8 and IL-10 were increased in AUD only. CONCLUSIONS AUD and cannabis use have complex effects on pulmonary innate immunity that promote airway inflammation.
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Affiliation(s)
- Kristina L Bailey
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States; Veterans Affairs, Nebraska Western-Iowa Healthcare System, Omaha, NE 68105, United States.
| | - Todd A Wyatt
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States; Veterans Affairs, Nebraska Western-Iowa Healthcare System, Omaha, NE 68105, United States; Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, NE 68198, United States
| | - Dawn M Katafiasz
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States
| | - Keenan W Taylor
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States
| | - Art J Heires
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States
| | - Joseph H Sisson
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States
| | - Debra J Romberger
- University of Nebraska Medical Center, Internal Medicine/Pulmonary, Critical Care Sleep and Allergy, Omaha, NE 68198, United States; Veterans Affairs, Nebraska Western-Iowa Healthcare System, Omaha, NE 68105, United States
| | - Ellen L Burnham
- University of Colorado, Anschutz Medical Campus, Aurora, CO 80045, United States
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Bailey KL, Smith LM, Heires AJ, Katafiasz DM, Romberger DJ, LeVan TD. Aging leads to dysfunctional innate immune responses to TLR2 and TLR4 agonists. Aging Clin Exp Res 2019; 31:1185-1193. [PMID: 30402800 PMCID: PMC6504629 DOI: 10.1007/s40520-018-1064-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 10/24/2018] [Indexed: 01/31/2023]
Abstract
BACKGROUND Sepsis is more common in the elderly. TNF⍺ is recognized as an important mediator in sepsis and Toll-like receptors (TLRs) play an important role in initiating signaling cascades to produce TNF⍺. Little is known about how innate immunity is altered in healthy human aging that predisposes to sepsis. AIMS AND METHODS We tested the hypothesis that aging dysregulates the innate immune response to TLR 2 and 4 ligands. We performed whole blood assays on 554 healthy subjects aged 40-80 years. TNFα production was measured at baseline and after stimulation with the TLR2 agonists: peptidoglycan, lipoteichoic acid, Pam3CysK, Zymosan A and the TLR4 agonist lipopolysaccharide (LPS). In a subset of subjects (n = 250), we measured Toll-like receptor (TLR) 2, 4 and MyD88 expression using real-time PCR. RESULTS AND DISCUSSION We measured a 2.5% increase per year in basal secretion of TNFα with aging (n = 554 p = 0.02). Likewise, TNFα secretion was increased with aging after stimulation with peptidoglycan (1.3% increase/year; p = 0.0005) and zymosan A (1.1% increase/year p = 0.03). We also examined the difference between baseline and stimulated TNFα for each individual. We found that the increase was driven by the elevated baseline levels. In fact, there was a diminished stimulated response to LPS (1.9% decrease/year; p = 0.05), lipoteichoic acid (2.1% decrease/year p = 0.03), and Pam3CysK (2.6% decrease/year p = 0.0007). There were no differences in TLR or MyD88 mRNA expression with aging, however, there was an inverse relationship between TLR expression and stimulated TNFα production. CONCLUSIONS With aging, circulating leukocytes produce high levels of TNFα at baseline and have inadequate responses to TLR2 and TLR4 agonists. These defects likely contribute to the increased susceptibility to sepsis in older adults.
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Affiliation(s)
- Kristina L Bailey
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198-5910, USA.
- VA Nebraska-Western Iowa Health Care System, Omaha, NE, 68105, USA.
| | - Lynette M Smith
- Department of Biostatistics, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Art J Heires
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198-5910, USA
- VA Nebraska-Western Iowa Health Care System, Omaha, NE, 68105, USA
| | - Dawn M Katafiasz
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198-5910, USA
| | - Debra J Romberger
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198-5910, USA
- VA Nebraska-Western Iowa Health Care System, Omaha, NE, 68105, USA
| | - Tricia D LeVan
- Division of Pulmonary, Critical Care, Sleep and Allergy, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198-5910, USA
- VA Nebraska-Western Iowa Health Care System, Omaha, NE, 68105, USA
- Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE, 68198, USA
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Knoell DL, Smith DA, Sapkota M, Heires AJ, Hanson CK, Smith LM, Poole JA, Wyatt TA, Romberger DJ. Insufficient zinc intake enhances lung inflammation in response to agricultural organic dust exposure. J Nutr Biochem 2019; 70:56-64. [PMID: 31153019 PMCID: PMC10575612 DOI: 10.1016/j.jnutbio.2019.04.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 03/18/2019] [Accepted: 04/25/2019] [Indexed: 11/15/2022]
Abstract
Organic dust exposure particularly within hog confinement facilities is a significant cause of airway inflammation and lung disease. In a cohort of Midwestern veterans with COPD and agricultural work exposure we observed reduced zinc intakes which were associated with decreased lung function. Because insufficient zinc intake is common within the U.S. and a potent modulator of innate immune function, we sought to determine whether deficits in zinc intake would impact the airway inflammatory response to hog confinement facility dust extract (HDE). Adult male C57BL/6 mice were randomized to zinc deficient or matched zinc sufficient diets for 3 weeks and subsequently treated with intranasal HDE inhalation or saline once or daily for 3 weeks while maintained on specific diets. Lavage fluid and lung tissue was collected. Conditions of zinc deficiency were also studied in macrophages exposed to HDE. Single and repetitive HDE inhalation exposure resulted in increased influx of total cells and neutrophils, increased mediator hyper-responsiveness (TNFα, IL-6, CXCL1, and amphiregulin), and enhanced tissue pathology that was more pronounced in zinc deficient mice compared to normal dietary counterparts. Airway inflammation was most pronounced in zinc deficient mice treated with repetitive HDE for 3 weeks. Similarly, macrophages maintained in a zinc deficient environment exhibited increased CXCL1 and IL-23 production as a result of increased NF-κB activation. Conclusion: Given the relatively high incidence of dietary deficiencies in agriculture workers, we anticipate that zinc intake, or a lack thereof, may play an important role in modulating the host response to organic dust exposure.
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Affiliation(s)
- Daren L Knoell
- The University of Nebraska Medical Center College of Pharmacy, Omaha, NE 68198.
| | - Deandra A Smith
- The University of Nebraska Medical Center College of Pharmacy, Omaha, NE 68198.
| | - Muna Sapkota
- The University of Nebraska Medical Center College of Pharmacy, Omaha, NE 68198.
| | - Art J Heires
- The University of Nebraska Medical Center College of Medicine, Omaha, NE 68198.
| | - Corrine K Hanson
- The University of Nebraska Medical Center College of Allied Health, Omaha, NE 68198.
| | - Lynette M Smith
- The University of Nebraska Medical Center College of Public Health, Omaha, NE 68198
| | - Jill A Poole
- The University of Nebraska Medical Center College of Medicine, Omaha, NE 68198.
| | - Todd A Wyatt
- The University of Nebraska Medical Center College of Medicine, Omaha, NE 68198; The University of Nebraska Medical Center College of Public Health, Omaha, NE 68198; VA Nebraska-Western Iowa Health Care System, Omaha, NE 68105.
| | - Debra J Romberger
- The University of Nebraska Medical Center College of Medicine, Omaha, NE 68198.
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Dodmane PR, Schulte NA, Heires AJ, Band H, Romberger DJ, Toews ML. Biphasic changes in airway epithelial cell EGF receptor binding and phosphorylation induced by components of hogbarn dust. Exp Lung Res 2019; 44:443-454. [PMID: 30862200 DOI: 10.1080/01902148.2019.1575931] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE OF THE STUDY Workers in enclosed hogbarns experience an increased incidence of airway inflammation and obstructive lung disease, and an aqueous hogbarn dust extract (HDE) induces multiple inflammation-related responses in cultured airway epithelial cells. Epidermal growth factor receptor (EGFR) phosphorylation and activation has been identified as one important mediator of inflammatory cytokine release from these cells. The studies here investigated both early and late phase adaptive changes in EGFR binding properties and subcellular localization induced by exposure of cells to HDE. MATERIALS AND METHODS Cell surface EGFRs were quantified as binding to intact cells on ice. EGFR phosphorylation, expression, and localization were assessed with anti-EGFR antibodies and either blotting or confocal microscopy. RESULTS In BEAS-2B and primary human bronchial epithelial cells, HDE induced decreases in cell surface EGFR binding following both 15-min and 18-h exposures. In contrast, H292 cells exhibited only the 15-min decrease, with binding near the control level at 18 hr. Confocal microscopy showed that the 15-min decrease in binding is due to EGFR endocytosis. Although total EGFR immunoreactivity decreased markedly at 18 hr in confocal microscopy with BEAS-2B cells, immunoblots showed no loss of EGFR protein. HDE stimulated EGFR phosphorylation at both 15 min and 18 hr in BEAS-2B cells and primary cells, but only at 15 min in H292 cells, indicating that the different EGFR binding changes among these cell types is likely related to their different time-dependent changes in phosphorylation. CONCLUSIONS These studies extend the evidence for EGFRs as important cellular targets for components of HDE and they reveal novel patterns of EGFR phosphorylation and binding changes that vary among airway epithelial cell types. The results provide both impetus and convenient assays for identifying the EGFR-activating components and pathways that likely contribute to hogbarn dust-induced lung disease in agricultural workers.
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Affiliation(s)
- Puttappa R Dodmane
- a Department of Pharmacology and Experimental Neuroscience , University of Nebraska Medical Center , Omaha , NE , USA
| | - Nancy A Schulte
- a Department of Pharmacology and Experimental Neuroscience , University of Nebraska Medical Center , Omaha , NE , USA
| | - Art J Heires
- b Veterans Affairs Nebraska-Western Iowa Health Care System , Research Service , Omaha , NE , USA.,c Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE , USA
| | - Hamid Band
- d Eppley Institute for Research in Cancer and Allied Diseases , University of Nebraska Medical Center , Omaha , NE , USA
| | - Debra J Romberger
- b Veterans Affairs Nebraska-Western Iowa Health Care System , Research Service , Omaha , NE , USA.,c Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE , USA
| | - Myron L Toews
- a Department of Pharmacology and Experimental Neuroscience , University of Nebraska Medical Center , Omaha , NE , USA
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Nordgren TM, Bailey KL, Heires AJ, Katafiasz D, Romberger DJ. Effects of Agricultural Organic Dusts on Human Lung-Resident Mesenchymal Stem (Stromal) Cell Function. Toxicol Sci 2019; 162:635-644. [PMID: 29319804 DOI: 10.1093/toxsci/kfx286] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Agricultural organic dust exposures trigger harmful airway inflammation, and workers experiencing repetitive dust exposures are at increased risk for lung disease. Mesenchymal stem/stromal cells (MSCs) regulate wound repair processes in the lung, and may contribute to either proresolution or -fibrotic lung responses. It is unknown how organic dust exposures alter lung-resident MSC activation and proinflammatory versus prorepair programs in the lung. To address this gap in knowledge, we isolated human lung-resident MSC from lung tissue. Cells were stimulated with aqueous extracts of organic dusts (DE) derived from swine confinement facilities and were assessed for changes in proliferative and migratory capacities, and production of proinflammatory and prorepair mediators. Through these investigations, we found that DE induces significant release of proinflammatory mediators TNF-α, IL-6, IL-8, and matrix metalloproteases, while also inducing the production of prorepair mediators amphiregulin, FGF-10, and resolvin D1. In addition, DE significantly reduced the growth and migratory capacities of lung-resident MSC. Together, these investigations indicate lung-resident MSC activation and wound repair activities are altered by organic dust exposures. These findings warrant future investigations to assess how organic dusts affect lung-resident mesenchymal stem/stromal cell function and impact airway inflammation, injury, and repair during agricultural aerosol exposures.
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Affiliation(s)
- Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198.,Division of Biomedical Sciences, School of Medicine, University of California Riverside, Riverside, California 92521
| | - Kristina L Bailey
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198.,VA Nebraska-Western Iowa Healthcare System, Omaha, Nebraska 68105
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Dawn Katafiasz
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198
| | - Debra J Romberger
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198.,VA Nebraska-Western Iowa Healthcare System, Omaha, Nebraska 68105
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10
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Nordgren TM, Heires AJ, Zempleni J, Swanson BJ, Wichman C, Romberger DJ. Bovine milk-derived extracellular vesicles enhance inflammation and promote M1 polarization following agricultural dust exposure in mice. J Nutr Biochem 2018; 64:110-120. [PMID: 30476878 DOI: 10.1016/j.jnutbio.2018.10.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 10/05/2018] [Accepted: 10/29/2018] [Indexed: 12/21/2022]
Abstract
Occupational agricultural dust exposure can cause severe lung injury, including COPD and asthma exacerbations. Cell-derived extracellular vesicles can mediate inflammatory responses and immune activation, but the contribution of diet-derived extracellular vesicles to these processes is poorly understood. We investigated whether bovine milk-derived extracellular vesicles modulate inflammatory responses to agricultural dust exposures in a murine model. C57BL/6 mice were fed either an extracellular vesicle-enriched modification of the AIN-93G diet with lyophilized bovine milk (EV) or a control diet wherein the milk was presonicated, disrupting the milk extracellular vesicles and thereby leading to RNA degradation (DEV). Mice were maintained on the diets for 5-7 weeks and challenged with a single (acute) intranasal instillation of a 12.5% organic dust extract (DE) or with 15 instillations over 3 weeks (repetitive exposure model). Through these investigations, we identified significant interactions between diet and DE when considering numerous inflammatory outcomes, including lavage inflammatory cytokine levels and cellular infiltration into the lung airways. DE-treated peritoneal macrophages also demonstrated altered polarization, with EV-fed mouse macrophages exhibiting an M1 shift compared to an M2 phenotype in DEV-fed mice (IL-6, TNF, IL-12/23 all significantly elevated, and IL-10 and arginase decreased in EV macrophages, ex vivo). In complementary in vitro studies, mouse macrophages treated with purified milk-derived EV were found to express similar polarization phenotypes upon DE stimulation. These results suggest a role for dietary extracellular vesicles in the modulation of lung inflammation in response to organic dust which may involve macrophage phenotype polarization.
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Affiliation(s)
- Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE, 68198; Division of Biomedical Sciences, School of Medicine, University of California Riverside, Riverside, CA, 92521.
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE, 68198.
| | - Janos Zempleni
- Nebraska Center for the Prevention of Obesity Diseases, Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, NE, 68588.
| | - Benjamin J Swanson
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, 68198.
| | - Christopher Wichman
- Department of Biostatistics, College of Public Health, University of Nebraska Medical Center, Omaha, NE, 68198.
| | - Debra J Romberger
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE, 68198; VA Nebraska-Western Iowa Health Care System, Omaha, NE, 68105.
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11
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LeVan TD, Romberger DJ, Siahpush M, Grimm BL, Ramos AK, Johansson PL, Michaud TL, Heires AJ, Wyatt TA, Poole JA. Relationship of systemic IL-10 levels with proinflammatory cytokine responsiveness and lung function in agriculture workers. Respir Res 2018; 19:166. [PMID: 30176916 PMCID: PMC6122449 DOI: 10.1186/s12931-018-0875-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 08/27/2018] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Agriculture workers are exposed to microbial component- and particulate matter-enriched organic dust aerosols. Whereas it is clear that exposure to these aerosols can lead to lung inflammation, it is not known how inflammatory responses are resolved in some individuals while others develop chronic lung disease. Interleukin (IL)-10 is an immunomodulatory cytokine that is recognized as a potent anti-inflammatory and pro-resolving factor. The objective of this study was to determine whether there is a relationship of systemic IL-10 and proinflammatory responses and/or respiratory health effects in humans with prior agriculture exposure. METHODS This is a cross sectional study of 625 veterans with > 2 years of farming experience. Whole blood was stimulated with or without organic dust and measured for IL-6, TNFα and IL-10. Participants underwent spirometry and respiratory symptoms were assessed by questionnaire. RESULTS We found that baseline IL-10 concentration from the whole blood assay was inversely associated with ΔTNF-α (r = - 0.63) and ΔIL-6 (r = - 0.37) levels. Results remained highly significant in the linear regression model after adjusting for age, sex, BMI, race, education, smoking status, and white blood cell count (ΔTNF-α, p < 0.0001; ΔIL-6, p < 0.0001). We found no association between chronic cough (p = 0.18), chronic phlegm (p = 0.31) and chronic bronchitis (p = 0.06) and baseline IL-10 levels using univariate logistic regression models. However, we did find that higher FEV1/FVC was significantly associated with increased baseline IL-10 concentration. CONCLUSIONS Collectively, these studies support a potential role for IL-10 in modulating an inflammatory response and lung function in agriculture-exposed persons.
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Affiliation(s)
- Tricia D. LeVan
- College of Public Health, University of Nebraska Medical Center, Omaha, NE USA
- Veterans Affairs Nebraska Western Iowa Healthcare System, Omaha, NE USA
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE USA
- Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE USA
| | - Debra J. Romberger
- Veterans Affairs Nebraska Western Iowa Healthcare System, Omaha, NE USA
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE USA
| | - Mohammad Siahpush
- College of Public Health, University of Nebraska Medical Center, Omaha, NE USA
| | - Brandon L. Grimm
- College of Public Health, University of Nebraska Medical Center, Omaha, NE USA
| | - Athena K. Ramos
- College of Public Health, University of Nebraska Medical Center, Omaha, NE USA
| | - Patrik L. Johansson
- College of Public Health, University of Nebraska Medical Center, Omaha, NE USA
| | - Tzeyu L. Michaud
- College of Public Health, University of Nebraska Medical Center, Omaha, NE USA
| | - Art J. Heires
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE USA
| | - Todd A. Wyatt
- Veterans Affairs Nebraska Western Iowa Healthcare System, Omaha, NE USA
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE USA
- Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Omaha, NE USA
| | - Jill A. Poole
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE USA
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12
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Abstract
Chronic obstructive pulmonary disease (COPD) is an inflammatory disorder characterized by incompletely reversible airflow obstruction. The complexity of the lung microbial community in COPD patients has been highlighted in recent years. Evidence suggests that transplantation, medications, age, and disease severity influence microbial community membership. However, the dynamics of the lung microbiome in stable COPD patients remain poorly understood. In this study, we completed a longitudinal 16S ribosomal RNA survey of the lung microbiome on replicate sputum samples collected from 4 former smokers with COPD (Stage 2) within a 2-day time period. Samples from each individual over the two-day period were similar based on α-diversity, principle component analysis and taxonomy at the phyla and genera level. Sputum samples from COPD patients were also collected between 2–9 months of follow-up. Data suggest an increased variability of the sputum microbiota when comparing samples collected ≤ 3 months compared to those collected ≥ 4 months; however, no statistically significant shifts in the abundance (>2-fold) of taxa between the two time points was observed. Bacterial composition and the number of operational taxonomic units (OTUs) remained similar over time. Results from this study suggest that the sputum microbiome is relatively stable in clinically stable COPD patients (Stage 2). This study furthers our understanding of the dynamics of the lung microbiome in COPD patients.
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Affiliation(s)
- Rohita Sinha
- University of Nebraska, Department of Food Science & Technology, Lincoln, NE, United States of America
| | | | - Jennifer L. Clarke
- University of Nebraska, Department of Food Science & Technology, Lincoln, NE, United States of America
| | - Lynette M. Smith
- University of Nebraska Medical Center, Department of Biostatistics, Omaha, NE, United States of America
| | - Art J. Heires
- University of Nebraska Medical Center, Department of Internal Medicine, Omaha, NE, United States of America
| | - Debra J. Romberger
- University of Nebraska Medical Center, Department of Internal Medicine and Veterans Nebraska Western Iowa Healthcare System, Omaha, NE, United States of America
| | - Tricia D. LeVan
- University of Nebraska, Department of Food Science & Technology, Lincoln, NE, United States of America
- University of Nebraska Medical Center, Department of Internal Medicine and Veterans Nebraska Western Iowa Healthcare System, Omaha, NE, United States of America
- * E-mail:
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13
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Nordgren TM, Heires AJ, Bailey KL, Katafiasz DM, Toews ML, Wichman CS, Romberger DJ. Docosahexaenoic acid enhances amphiregulin-mediated bronchial epithelial cell repair processes following organic dust exposure. Am J Physiol Lung Cell Mol Physiol 2017; 314:L421-L431. [PMID: 29097425 DOI: 10.1152/ajplung.00273.2017] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Injurious dust exposures in the agricultural workplace involve the release of inflammatory mediators and activation of epidermal growth factor receptor (EGFR) in the respiratory epithelium. Amphiregulin (AREG), an EGFR ligand, mediates tissue repair and wound healing in the lung epithelium. Omega-3 fatty acids such as docosahexaenoic acid (DHA) are also known modulators of repair and resolution of inflammatory injury. This study investigated how AREG, DHA, and EGFR modulate lung repair processes following dust-induced injury. Primary human bronchial epithelial (BEC) and BEAS-2B cells were treated with an aqueous extract of swine confinement facility dust (DE) in the presence of DHA and AREG or EGFR inhibitors. Mice were exposed to DE intranasally with or without EGFR inhibition and DHA. Using a decellularized lung scaffolding tissue repair model, BEC recolonization of human lung scaffolds was analyzed in the context of DE, DHA, and AREG treatments. Through these investigations, we identified an important role for AREG in mediating BEC repair processes. DE-induced AREG release from BEC, and DHA treatment following DE exposure, enhanced this release. Both DHA and AREG also enhanced BEC repair capacities and rescued DE-induced recellularization deficits. In vivo, DHA treatment enhanced AREG production following DE exposure, whereas EGFR inhibitor-treated mice exhibited reduced AREG in their lung homogenates. These data indicate a role for AREG in the process of tissue repair after inflammatory lung injury caused by environmental dust exposure and implicate a role for DHA in regulating AREG-mediated repair signaling in BEC.
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Affiliation(s)
- Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska.,Division of Biomedical Sciences, School of Medicine, University of California Riverside , Riverside, California
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Kristina L Bailey
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska.,Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Dawn M Katafiasz
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
| | - Myron L Toews
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center , Omaha, Nebraska
| | - Christopher S Wichman
- Department of Biostatistics, University of Nebraska Medical Center , Omaha, Nebraska
| | - Debra J Romberger
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska.,Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska
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14
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LeVan TD, Smith LM, Heires AJ, Mikuls TR, Meza JL, Weissenburger-Moser LA, Romberger DJ. Interaction of CD14 haplotypes and soluble CD14 on pulmonary function in agricultural workers. Respir Res 2017; 18:49. [PMID: 28302109 PMCID: PMC5353891 DOI: 10.1186/s12931-017-0532-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 03/07/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Agricultural environments are contaminated with organic dusts containing bacterial components. Chronic inhalation of organic dusts is implicated in respiratory diseases. CD14 is a critical receptor for gram-negative lipopolysaccharide; however, its association with respiratory disease among agricultural workers is unknown. The objective of this study was to determine if serum soluble CD14 (sCD14) levels are associated with lung function among agricultural workers and if this association is modified by genetic variants in CD14. METHODS This cross-sectional study included 584 veterans with >2 years of farming experience and that were between the ages of 40 and 80 years. Participants underwent spirometry and were genotyped for four tagging CD14 polymorphisms (CD14/-2838, rs2569193; CD14/-1720, rs2915863; CD14/-651, rs5744455; and CD14/-260, rs2569190). Serum sCD14 was assayed by ELISA. RESULTS Subjects were 98% white males with a mean age 64.5 years. High soluble CD14 levels (> median sCD14) were associated decreased lung function (FEV1/FVC, p = 0.011; % predicted FEV1, p = 0.03). When stratified by COPD (yes/no) and smoking status (ever/never), high sCD14 levels (> median sCD14) were associated with low lung function among ever smokers with COPD (% predicted FEV1, padj = 0.0008; FEV1/FVC, padj = 0.0002). A similar trend was observed for never smokers with COPD; however, results did not reach statistical significance due to small sample size. There was a significant sCD14 x COPD/smoking interaction with lung function (% predicted FEV1, pinter = 0.0498; FEV1/FVC, pinter = 0.011). Regression models were adjusted for age, body mass index, education, sex, race and years worked on a farm. No association was found between CD14 polymorphisms/haplotypes (CD14/-2838; CD14/-1720; CD14/-651; CD14/-260) and sCD14 levels. The final model included the variables sCD14 and haplotypes and a haplotype x sCD14 interaction term. Individuals with the GTTG haplotype (CD14/-2838 → CD14/-260) and high sCD14 levels (> median sCD14) had on average 6.94 lower % predicted FEV1 than individuals with the GCCA haplotype and low sCD14 levels (≤ median sCD14, padj = 0.03). CONCLUSION CD14 haplotypes and sCD14 are important mediators of lung function among those with COPD in this occupationally-exposed population.
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Affiliation(s)
- Tricia D LeVan
- Department of Epidemiology, University of Nebraska Medical Center, 985910, Omaha, NE, 68198-5910, USA. .,Department of Internal Medicine and Veterans Nebraska Western Iowa Healthcare System, Omaha, NE, USA.
| | - Lynette M Smith
- Department of Biostatistics, University of Nebraska Medical Center, Omaha, NE, USA
| | - Art J Heires
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, USA
| | - Ted R Mikuls
- Department of Internal Medicine and Veterans Nebraska Western Iowa Healthcare System, Omaha, NE, USA
| | - Jane L Meza
- Department of Biostatistics, University of Nebraska Medical Center, Omaha, NE, USA
| | | | - Debra J Romberger
- Department of Internal Medicine and Veterans Nebraska Western Iowa Healthcare System, Omaha, NE, USA
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15
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Wyatt TA, Canady K, Heires AJ, Poole JA, Bailey KL, Nordgren TM, Romberger DJ. Alcohol Inhibits Organic Dust-induced ICAM-1 Expression on Bronchial Epithelial Cells. Safety (Basel) 2017; 3:5. [PMID: 29082234 PMCID: PMC5658133 DOI: 10.3390/safety3010005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
UNLABELLED Aims: Exposure to dusts/bioaerosols in concentrated animal feeding operations (CAFOs) results in inflammatory lung diseases in workers. Hog CAFOs dust extract (HDE) increases expression of intercellular adhesion molecule-1 (ICAM-1), neutrophil adhesion, and TNFα release in bronchial epithelial cells. Alcohol consumption is increasingly recognized to impair lung immunity. We hypothesized that alcohol impairs HDE-induced TNFα, ICAM-1 expression and neutrophil adhesion by directly inhibiting TNFα converting enzyme (TACE) activity. METHODS Bronchial epithelial cells (BEAS-2B) and primary human bronchial epithelial cells were pretreated with ethanol (EtOH) or TACE inhibitor. ICAM-1 surface expression, TNFα release, and TACE activity were analyzed following HDE stimulation. The effect of alcohol and TACE inhibition on HDE-regulated epithelial cell/neutrophil adhesion interactions was investigated. Finally, utilizing an established animal model, C57BL/6 mice were fed ad libitum ethanol (20%) in drinking water for 8 wk followed by daily intranasal inhalation of HDE or saline during the final two weeks. Mice were sacrificed and lung sections immunostained for ICAM-1. RESULTS Pretreatment with alcohol or TACE inhibitor significantly decreased HDE-induced ICAM-1 expression and TNFα release. HDE augmented neutrophil adhesion to epithelial cells, which was decreased with alcohol (32% decrease) or TACE inhibitor (55% decrease) pretreatment. TACE activity increased following HDE exposure, but TACE activity was inhibited following alcohol pretreatment. Alcohol-fed mice demonstrated decreased HDE-induced airway epithelium ICAM-1 expression. CONCLUSIONS Alcohol diminishes HDE-induced ICAM-1 expression, TNFα release, and neutrophil adhesion via inhibition of TACE activity. These results suggest that alcohol may be an important modulator of lung innate immune responses following CAFO exposure.
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Affiliation(s)
- Todd A. Wyatt
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
- Department of Environmental, Agricultural, & Occupational Health, University of Nebraska Medical Center, Omaha, NE, 68198-5910
- Resereach Service, VA Omaha-Western Iowa Health Care System, Omaha, NE, 68105
| | - Kerry Canady
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
| | - Art J. Heires
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
| | - Jill A. Poole
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
| | - Kristina L. Bailey
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
- Resereach Service, VA Omaha-Western Iowa Health Care System, Omaha, NE, 68105
| | - Tara M. Nordgren
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
| | - Debra J. Romberger
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198; USA
- Resereach Service, VA Omaha-Western Iowa Health Care System, Omaha, NE, 68105
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16
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Wells A, Romberger DJ, Thiele GM, Wyatt TA, Staab E, Heires AJ, Klassen LW, Duryee MJ, Mikuls TR, Dusad A, West WW, Wang D, Poole JA. Systemic IL-6 Effector Response in Mediating Systemic Bone Loss Following Inhalation of Organic Dust. J Interferon Cytokine Res 2016; 37:9-19. [PMID: 27875664 DOI: 10.1089/jir.2016.0048] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Airway and skeletal diseases are prominent among agriculture workers. Repetitive inhalant exposures to agriculture organic dust extract (ODE) induces bone deterioration in mice; yet the mechanisms responsible for connecting the lung-bone inflammatory axis remain unclear. We hypothesized that the interleukin (IL)-6 effector response regulates bone deterioration following inhalant ODE exposures. Using an established intranasal inhalation exposure model, wild-type (WT) and IL-6 knockout (KO) mice were treated daily with ODE or saline for 3 weeks. ODE-induced airway neutrophil influx, cytokine/chemokine release, and lung pathology were not reduced in IL-6 KO animals compared to WT mice. Utilizing micro-computed tomography, analysis of tibia showed that loss of bone mineral density, volume, and deterioration of bone micro-architecture, and mechanical strength induced by inhalant ODE exposures in WT mice were absent in IL-6 KO animals. Compared to saline treatments, bone-resorbing osteoclasts and bone marrow osteoclast precursor populations were also increased in ODE-treated WT but not IL-6 KO mice. These results show that the systemic IL-6 effector pathway mediates bone deterioration induced by repetitive inhalant ODE exposures through an effect on osteoclasts, but a positive role for IL-6 in the airway was not demonstrated. IL-6 might be an important link in explaining the lung-bone inflammatory axis.
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Affiliation(s)
- Adam Wells
- 1 Pulmonary, Critical Care, Sleep & Allergy Division, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Debra J Romberger
- 1 Pulmonary, Critical Care, Sleep & Allergy Division, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska.,2 Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha, Nebraska
| | - Geoffrey M Thiele
- 2 Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha, Nebraska.,3 Rheumatology Division, Department of Medicine, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Todd A Wyatt
- 1 Pulmonary, Critical Care, Sleep & Allergy Division, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska.,2 Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha, Nebraska.,4 Department of Environmental, Agricultural, and Occupational Health, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Elizabeth Staab
- 1 Pulmonary, Critical Care, Sleep & Allergy Division, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Art J Heires
- 1 Pulmonary, Critical Care, Sleep & Allergy Division, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska.,2 Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha, Nebraska
| | - Lynell W Klassen
- 2 Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha, Nebraska.,3 Rheumatology Division, Department of Medicine, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Michael J Duryee
- 2 Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha, Nebraska.,3 Rheumatology Division, Department of Medicine, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Ted R Mikuls
- 2 Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha, Nebraska.,3 Rheumatology Division, Department of Medicine, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Anand Dusad
- 3 Rheumatology Division, Department of Medicine, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - William W West
- 5 Department of Pathology and Microbiology, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Dong Wang
- 6 Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
| | - Jill A Poole
- 1 Pulmonary, Critical Care, Sleep & Allergy Division, University of Nebraska Medical Center , The Nebraska Medical Center, Omaha, Nebraska
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17
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Gerald CL, Romberger DJ, DeVasure JM, Khazanchi R, Nordgren TM, Heires AJ, Sisson JH, Wyatt TA. Alcohol Decreases Organic Dust-Stimulated Airway Epithelial TNF-Alpha Through a Nitric Oxide and Protein Kinase-Mediated Inhibition of TACE. Alcohol Clin Exp Res 2016; 40:273-83. [PMID: 26842246 DOI: 10.1111/acer.12967] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 11/18/2015] [Indexed: 12/24/2022]
Abstract
BACKGROUND Farm workers in rural areas consume more alcohol than those who reside in urban areas. Occupational exposures such as agricultural work can pose hazards on the respiratory system. It is established that hog barn dust induces inflammation in the airway, including the release of cytokines such as tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), and IL-8. We have shown that alcohol alters airway epithelial innate defense through changes in both nitric oxide (NO) and cAMP-dependent protein kinase A (PKA). Simultaneous exposure to hog barn dust and alcohol decreases inflammatory mediators, TNF-α, IL-6, and IL-8, in mice. Previously, mice exposed to both alcohol and hog barn dust showed a depleted amount of lymphocytes compared to mice exposed only to hog barn dust. Weakening of the innate immune response could lead to enhanced susceptibility to disease. In addition, mice that were co-exposed to hog barn dust and alcohol also experienced increased mortality. METHODS Because we recently demonstrated that PKA activation inhibits the TNF-α sheddase, TNF-α-converting enzyme (TACE), we hypothesized that an alcohol-mediated PKA pathway blocks TACE activity and prevents the normative inflammatory response to hog barn dust exposure. To delineate these effects, we used PKA pathway inhibitors (adenylyl cyclase [AC], cAMP, and PKA) to modulate the effects of alcohol on dust-stimulated TNF-α release in the bronchial epithelial cell line, BEAS-2B. Alcohol pretreatment blocked TACE activity and TNF-α release in hog barn dust-treated cells. RESULTS Alcohol continued to block hog barn dust-mediated TNF-α release in the presence of the particulate AC inhibitor, SQ22,536. The soluble adenylyl cyclase inhibitor, KH7, however, significantly increased the inflammatory response to hog barn dust. phosphodiesterase 4 inhibitors significantly elevated cAMP and enhanced alcohol-mediated inhibition of dust-stimulated TNF-α release. In addition, the NO synthase inhibitor, l-NMMA, also reversed the alcohol-blocking effect on dust-stimulated TNF-α. CONCLUSIONS These data suggest that alcohol requires a soluble cyclase-generated cAMP-PKA pathway that is dependent upon the action of NO to inhibit TACE and TNF-α release. These findings support our observations that alcohol functions through a dual NO and PKA pathway in bronchial epithelial cells.
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Affiliation(s)
- Carresse L Gerald
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Debra J Romberger
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska.,Department of Veterans Affairs Medical Center, VA Nebraska-Western Iowa Health Care System Research Service, Omaha, Nebraska
| | - Jane M DeVasure
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Rohan Khazanchi
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Tara M Nordgren
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Art J Heires
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Joseph H Sisson
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Todd A Wyatt
- Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska.,Department of Veterans Affairs Medical Center, VA Nebraska-Western Iowa Health Care System Research Service, Omaha, Nebraska.,Department of Environmental, Agricultural, and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska
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18
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Romberger DJ, Heires AJ, Nordgren TM, Poole JA, Toews ML, West WW, Wyatt TA. β2-Adrenergic agonists attenuate organic dust-induced lung inflammation. Am J Physiol Lung Cell Mol Physiol 2016; 311:L101-10. [PMID: 27190062 DOI: 10.1152/ajplung.00125.2016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 05/17/2016] [Indexed: 01/05/2023] Open
Abstract
Agricultural dust exposure results in significant lung inflammation, and individuals working in concentrated animal feeding operations (CAFOs) are at risk for chronic airway inflammatory diseases. Exposure of bronchial epithelial cells to aqueous extracts of hog CAFO dusts (HDE) leads to inflammatory cytokine production that is driven by protein kinase C (PKC) activation. cAMP-dependent protein kinase (PKA)-activating agents can inhibit PKC activation in epithelial cells, leading to reduced inflammatory cytokine production following HDE exposure. β2-Adrenergic receptor agonists (β2-agonists) activate PKA, and we hypothesized that β2-agonists would beneficially impact HDE-induced adverse airway inflammatory consequences. Bronchial epithelial cells were cultured with the short-acting β2-agonist salbutamol or the long-acting β2-agonist salmeterol prior to stimulation with HDE. β2-Agonist treatment significantly increased PKA activation and significantly decreased HDE-stimulated IL-6 and IL-8 production in a concentration- and time-dependent manner. Salbutamol treatment significantly reduced HDE-induced intracellular adhesion molecule-1 expression and neutrophil adhesion to epithelial cells. Using an established intranasal inhalation exposure model, we found that salbutamol pretreatment reduced airway neutrophil influx and IL-6, TNF-α, CXCL1, and CXCL2 release in bronchoalveolar lavage fluid following a one-time exposure to HDE. Likewise, when mice were pretreated daily with salbutamol prior to HDE exposure for 3 wk, HDE-induced neutrophil influx and inflammatory mediator production were also reduced. The severity of HDE-induced lung pathology in mice repetitively exposed to HDE for 3 wk was also decreased with daily salbutamol pretreatment. Together, these results support the need for future clinical investigations to evaluate the utility of β2-agonist therapies in the treatment of airway inflammation associated with CAFO dust exposure.
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Affiliation(s)
- Debra J Romberger
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska; Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska;
| | - Art J Heires
- Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Tara M Nordgren
- Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Jill A Poole
- Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Myron L Toews
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, Nebraska
| | - William W West
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska; and
| | - Todd A Wyatt
- Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska; Pulmonary, Critical Care, Sleep, and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska; Department of Environmental, Agricultural, and Occupational Health, University of Nebraska Medical Center, Omaha, Nebraska
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Bailey KL, Romberger DJ, Katafiasz DM, Heires AJ, Sisson JH, Wyatt TA, Burnham EL. TLR2 and TLR4 Expression and Inflammatory Cytokines are Altered in the Airway Epithelium of Those with Alcohol Use Disorders. Alcohol Clin Exp Res 2015. [PMID: 26208141 DOI: 10.1111/acer.12803] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
BACKGROUND The lung has a highly regulated system of innate immunity to protect itself from inhaled microbes and toxins. The first line of defense is mucociliary clearance, but if invaders overcome this, inflammatory pathways are activated. Toll-like receptors (TLRs) are expressed on the airway epithelium. Their signaling initiates the inflammatory cascade and leads to production of inflammatory cytokines such as interleukin (IL)-6 and IL-8. We hypothesized that airway epithelial insults, including heavy alcohol intake or smoking, would alter the expression of TLRs on the airway epithelium. METHODS Bronchoscopy with bronchoalveolar lavage and brushings of the airway epithelium was performed in otherwise healthy subjects who had normal chest radiographs and spirometry. A history of alcohol use disorders (AUDs) was ascertained using the Alcohol Use Disorders Identification Test (AUDIT), and a history of cigarette smoking was also obtained. Age, gender, and nutritional status in all groups were similar. We used real-time polymerase chain reaction (PCR) to quantitate TLR1 to 9 and enzyme-linked immune assay to measure tumor necrosis factor-α, IL-6, and IL-8. RESULTS Airway brushings were obtained from 26 nonsmoking/non-AUD subjects, 28 smoking/non-AUD subjects, 36 smoking/AUD subjects, and 17 nonsmoking/AUD subjects. We found that TLR2 is up-regulated in AUD subjects, compared to nonsmoking/non-AUD subjects, and correlated with their AUDIT scores. We also measured a decrease in TLR4 expression in AUD subjects that correlated with AUDIT score. IL-6 and IL-8 were also increased in bronchial washings from AUD subjects. CONCLUSIONS We have previously demonstrated in normal human bronchial epithelial cells that in vitro alcohol exposure up-regulates TLR2 through a NO/cGMP/PKG-dependent pathway, resulting in up-regulation of inflammatory cytokine production after Gram-positive bacterial product stimulation. Our current translational study confirms that TLR2 is also up-regulated in humans with AUDs.
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Affiliation(s)
- Kristina L Bailey
- Internal Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy, University of Nebraska Medical Center, Omaha, Nebraska.,Veterans Affairs Nebraska-Western Iowa Health Care System, Research Service, Omaha, Nebraska
| | - Debra J Romberger
- Internal Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy, University of Nebraska Medical Center, Omaha, Nebraska.,Veterans Affairs Nebraska-Western Iowa Health Care System, Research Service, Omaha, Nebraska
| | - Dawn M Katafiasz
- Internal Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy, University of Nebraska Medical Center, Omaha, Nebraska
| | - Art J Heires
- Internal Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy, University of Nebraska Medical Center, Omaha, Nebraska.,Veterans Affairs Nebraska-Western Iowa Health Care System, Research Service, Omaha, Nebraska
| | - Joseph H Sisson
- Internal Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy, University of Nebraska Medical Center, Omaha, Nebraska
| | - Todd A Wyatt
- Internal Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy, University of Nebraska Medical Center, Omaha, Nebraska.,Veterans Affairs Nebraska-Western Iowa Health Care System, Research Service, Omaha, Nebraska.,Department of Environmental, Agricultural & Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska
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Nordgren TM, Bauer CD, Heires AJ, Poole JA, Wyatt TA, West WW, Romberger DJ. Maresin-1 reduces airway inflammation associated with acute and repetitive exposures to organic dust. Transl Res 2015; 166:57-69. [PMID: 25655838 PMCID: PMC4458456 DOI: 10.1016/j.trsl.2015.01.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 01/06/2015] [Accepted: 01/07/2015] [Indexed: 01/17/2023]
Abstract
Agriculture industry workers are at a higher risk for chronic bronchitis and obstructive pulmonary diseases, and current therapeutics are not entirely effective. We previously found that the specialized proresolving lipid mediator maresin-1 (MaR1) reduced proinflammatory cytokine release and intracellular adhesion molecule-1 (ICAM-1) expression in bronchial epithelial cells exposed to extracts of organic dust (DE) derived from swine confinement facilities in vitro. The objective of this study was to determine whether MaR1 is effective at limiting lung inflammation associated with acute and repetitive exposures to DE in an established murine model of inhalant dust exposures. C57Bl/6 mice were treated with MaR1 or vehicle control and intranasally instilled with DE once or daily for 3 weeks. Bronchioalveolar lavage fluid was analyzed for total and differential cell counts and proinflammatory cytokine levels, and lung tissues were assessed for histopathology and ICAM-1 expression. In both single and repetitive DE exposure studies, MaR1 significantly decreased bronchoalveolar lavage neutrophil infiltration, interleukin 6, tumor necrosis factor α, and chemokine C-X-C motif ligand 1 levels without altering repetitive DE-induced bronchioalveolar inflammation or lymphoid aggregate formation. Lung tissue ICAM-1 expression was also reduced in both single and repetitive exposure studies. These data suggest that MaR1 might contribute to an effective strategy to reduce airway inflammatory diseases induced by agricultural-related organic dust environmental exposures.
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Affiliation(s)
- Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Neb
| | - Christopher D Bauer
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Neb
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Neb
| | - Jill A Poole
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Neb
| | - Todd A Wyatt
- VA Nebraska-Western Iowa Health Care System, Research Service and Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Neb; Department of Environmental, Agricultural, and Occupational Health, University of Nebraska Medical Center, Omaha, Neb
| | - William W West
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Neb
| | - Debra J Romberger
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Neb; VA Nebraska-Western Iowa Health Care System, Research Service and Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Neb.
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Romberger DJ, Heires AJ, Nordgren TM, Souder CP, West W, Liu XD, Poole JA, Toews ML, Wyatt TA. Proteases in agricultural dust induce lung inflammation through PAR-1 and PAR-2 activation. Am J Physiol Lung Cell Mol Physiol 2015; 309:L388-99. [PMID: 26092994 DOI: 10.1152/ajplung.00025.2015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 06/09/2015] [Indexed: 01/31/2023] Open
Abstract
Workers exposed to aerosolized dust present in concentrated animal feeding operations (CAFOs) are susceptible to inflammatory lung diseases, such as chronic obstructive pulmonary disease. Extracts of dust collected from hog CAFOs [hog dust extract (HDE)] are potent stimulators of lung inflammatory responses in several model systems. The observation that HDE contains active proteases prompted the present study, which evaluated the role of CAFO dust proteases in lung inflammatory processes and tested whether protease-activated receptors (PARs) are involved in the signaling pathway for these events. We hypothesized that the damaging proinflammatory effect of HDE is due, in part, to the proteolytic activation of PARs, and inhibiting the proteases in HDE or disrupting PAR activation would attenuate HDE-mediated inflammatory indexes in bronchial epithelial cells (BECs), in mouse lung slices in vitro, and in a murine in vivo exposure model. Human BECs and mouse lung slice cultures stimulated with 5% HDE released significantly more of each of the cytokines measured (IL-6, IL-8, TNF-α, keratinocyte-derived chemokine/CXC chemokine ligand 1, and macrophage inflammatory protein-2/CXC chemokine ligand 2) than controls, and these effects were markedly diminished by protease inhibition. Inhibition of PARs also blunted the HDE-induced cytokine release from BECs. In addition, protease depletion inhibited HDE-induced BEC intracellular PKCα and PKCε activation. C57BL/6J mice administered 12.5% HDE intranasally, either once or daily for 3 wk, exhibited increased total cellular and neutrophil influx, bronchial alveolar fluid inflammatory cytokines, lung histopathology, and inflammatory scores compared with mice receiving protease-depleted HDE. These data suggest that proteases in dust from CAFOs are important mediators of lung inflammation, and these proteases and their receptors may provide novel targets for therapeutic intervention in CAFO dust-induced airways disease.
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Affiliation(s)
- Debra J Romberger
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska; Veterans Affairs Nebraska-Western Iowa Healthcare System, Omaha, Nebraska;
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - Chelsea P Souder
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - William West
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Xiang-de Liu
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - Jill A Poole
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska
| | - Myron L Toews
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, Nebraska
| | - Todd A Wyatt
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, Nebraska; Veterans Affairs Nebraska-Western Iowa Healthcare System, Omaha, Nebraska; Department of Environmental, Agricultural, and Occupational Health, University of Nebraska Medical Center, Omaha, Nebraska; and
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Schneberger D, Gordon JR, DeVasure JM, Boten JA, Heires AJ, Romberger DJ, Wyatt TA. CXCR1/CXCR2 antagonist CXCL8(3-74)K11R/G31P blocks lung inflammation in swine barn dust-instilled mice. Pulm Pharmacol Ther 2015; 31:55-62. [PMID: 25681618 DOI: 10.1016/j.pupt.2015.02.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 01/15/2015] [Accepted: 02/03/2015] [Indexed: 11/28/2022]
Abstract
Inhalation of agricultural occupational dusts from swine confinement facilities can result in lung inflammation. The innate immune response to organic barn dusts results in production of a number of pro-inflammatory factors in the lungs of barn workers such as cytokines, chemokines, and an influx of neutrophils. Many of these inflammatory factors are influenced by the chemokine CXCL8/IL-8 (KC or MIP-2 in mice). Previously, we have demonstrated that an endotoxin-independent component of swine barn dust extract (SBE) elevates lung chemokines in a protein kinase C (PKC)-dependent manner resulting in the significant formation of lung inflammatory cell infiltrates in a mouse model of SBE injury. In this study we test the ability of a CXCR1/CXCR2 antagonist, CXCL8(3-74)K11R/G31P (G31P) to block many of the features of lung-inflammation in response to challenge with SBE in an established mouse exposure system. Injection of G31P concurrent with SBE nasal instillation over a course of 3 weeks significantly reduced neutrophil accumulation in the lungs of barn dust exposed animals compared to those given SBE alone. There was a similar reduction in pro-inflammatory cytokines and chemokines IL-6, KC, and MIP-2 in SBE plus G31P-treated mice. In addition to excreted products, the receptors ICAM-1, CXCR1, and CXCR2, which all were elevated with SBE exposure, were also decreased with G31P treatment. SBE activation of PKCα and PKCε was reduced as well with G31P treatment. Thus, G31P was found to be highly effective at reducing several features of lung inflammation in mice exposed to barn dust extracts.
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Affiliation(s)
- D Schneberger
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - J R Gordon
- Division of Respirology, Critical Care and Sleep Medicine, Department of Medicine, University of Saskatchewan, Saskatoon, SK S7N5B4, Canada.
| | - J M DeVasure
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - J A Boten
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - A J Heires
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - D J Romberger
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA; VA Nebraska-Western Iowa Healthcare System, Research Service and the University of Nebraska Medical Center Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, Omaha, NE 68198, USA.
| | - T A Wyatt
- Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA; VA Nebraska-Western Iowa Healthcare System, Research Service and the University of Nebraska Medical Center Pulmonary, Critical Care, Sleep & Allergy Division of the Department of Internal Medicine, Omaha, NE 68198, USA; Department of Environmental, Agricultural, and Occupational Health, University of Nebraska Medical Center, Omaha, NE 68198, USA.
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Nordgren TM, Friemel TD, Heires AJ, Poole JA, Wyatt TA, Romberger DJ. The omega-3 fatty acid docosahexaenoic acid attenuates organic dust-induced airway inflammation. Nutrients 2014; 6:5434-52. [PMID: 25436433 PMCID: PMC4276977 DOI: 10.3390/nu6125434] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 11/03/2014] [Accepted: 11/13/2014] [Indexed: 12/31/2022] Open
Abstract
Workers exposed to organic dusts from concentrated animal feeding operations (CAFOs) are at risk for developing airway inflammatory diseases. Available preventative and therapeutic measures for alleviating dust-induced lung disease are inadequate. Because omega-3 fatty acids can mitigate inflammatory processes, we aimed to determine whether nutritional supplementation with the omega-3 fatty acid docosahexaenoic acid (DHA) could reduce the airway inflammatory consequences of exposures to organic dust. Aqueous extracts of organic dusts from swine CAFOs (ODE) were utilized. In DHA-pretreated human bronchial epithelial cells, lung fibroblasts, monocyte cell cultures, and precision-cut murine lung slices, we found that DHA pretreatment dose-dependently decreased ODE-induced inflammatory cytokine production. To determine the in vivo significance of DHA, C57BL/6 mice were orally administered DHA for seven days prior to treatment with intranasal ODE or saline inhalations. Animals treated with 2 mg DHA demonstrated significant reductions in ODE-induced bronchial alveolar lavage neutrophil influx and pro-inflammatory cytokine/chemokine production compared to mice exposed to ODE alone. Collectively, these data demonstrate that DHA affects several lung cells to reduce the airway inflammatory response to organic dust exposures. Dietary supplementation with DHA may be an effective therapeutic strategy to reduce the airway inflammatory consequences in individuals exposed to agriculture dust environments.
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Affiliation(s)
- Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - Taylor D Friemel
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - Jill A Poole
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - Todd A Wyatt
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE 68198, USA.
| | - Debra J Romberger
- Pulmonary, Critical Care, Sleep and Allergy Division, University of Nebraska Medical Center, Omaha, NE 68198, USA.
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Wyatt TA, Poole JA, Nordgren TM, DeVasure JM, Heires AJ, Bailey KL, Romberger DJ. cAMP-dependent protein kinase activation decreases cytokine release in bronchial epithelial cells. Am J Physiol Lung Cell Mol Physiol 2014; 307:L643-51. [PMID: 25150062 DOI: 10.1152/ajplung.00373.2013] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Lung injury caused by inhalation of dust from swine-concentrated animal-feeding operations (CAFO) involves the release of inflammatory cytokine interleukin 8 (IL-8), which is mediated by protein kinase C-ε (PKC-ε) in airway epithelial cells. Once activated by CAFO dust, PKC-ε is responsible for slowing cilia beating and reducing cell migration for wound repair. Conversely, the cAMP-dependent protein kinase (PKA) stimulates contrasting effects, such as increased cilia beating and an acceleration of cell migration for wound repair. We hypothesized that a bidirectional mechanism involving PKA and PKC regulates epithelial airway inflammatory responses. To test this hypothesis, primary human bronchial epithelial cells and BEAS-2B cells were treated with hog dust extract (HDE) in the presence or absence of cAMP. PKC-ε activity was significantly reduced in cells that were pretreated for 1 h with 8-bromoadenosine 3',5'-cyclic monophosphate (8-Br-cAMP) before exposure to HDE (P < 0.05). HDE-induced IL-6, and IL-8 release was significantly lower in cells that were pretreated with 8-Br-cAMP (P < 0.05). To exclude exchange protein activated by cAMP (EPAC) involvement, cells were pretreated with either 8-Br-cAMP or 8-(4-chlorophenylthio)-2'-O-methyladenosine-3',5'-cyclic monophosphate (8-CPT-2Me-cAMP) (EPAC agonist). 8-CPT-2Me-cAMP did not activate PKA and did not reduce HDE-stimulated IL-6 release. In contrast, 8-Br-cAMP decreased HDE-stimulated tumor necrosis factor (TNF)-α-converting enzyme (TACE; ADAM-17) activity and subsequent TNF-α release (P < 0.001). 8-Br-cAMP also blocked HDE-stimulated IL-6 and keratinocyte-derived chemokine release in precision-cut mouse lung slices (P < 0.05). These data show bidirectional regulation of PKC-ε via a PKA-mediated inhibition of TACE activity resulting in reduced PKC-ε-mediated release of IL-6 and IL-8.
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Affiliation(s)
- Todd A Wyatt
- VA Nebraska-Western Iowa Health Care System Research Service, Department of Veterans Affairs Medical Center, Omaha, Nebraska; Department of Environmental, Agricultural, and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska; Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Jill A Poole
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Tara M Nordgren
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Jane M DeVasure
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Art J Heires
- Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine, Nebraska Medical Center, Omaha, Nebraska
| | - Kristina L Bailey
- VA Nebraska-Western Iowa Health Care System Research Service, Department of Veterans Affairs Medical Center, Omaha, Nebraska; Department of Environmental, Agricultural, and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska
| | - Debra J Romberger
- VA Nebraska-Western Iowa Health Care System Research Service, Department of Veterans Affairs Medical Center, Omaha, Nebraska; Department of Environmental, Agricultural, and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska
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Nordgren TM, Wyatt TA, Sweeter J, Bailey KL, Poole JA, Heires AJ, Sisson JH, Romberger DJ. Motile cilia harbor serum response factor as a mechanism of environment sensing and injury response in the airway. Am J Physiol Lung Cell Mol Physiol 2014; 306:L829-39. [PMID: 24610937 DOI: 10.1152/ajplung.00364.2013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Nonmotile primary cilia are recognized as important sensory organelles during development and normal biological functioning. For example, recent work demonstrates that transcriptional regulators of the sonic hedgehog signaling pathway localize to primary cilia and participate in sensing and transducing signals regarding the cellular environment. In contrast, motile cilia are traditionally viewed as mechanical machinery, vital for the movement of solutes and clearance of bacteria and debris, but not participants in cellular sensing and signaling mechanisms. Recently, motile cilia were found to harbor receptors responsible for sensing and responding to environmental stimuli. However, no transcription factors are known to be regulated by cilia localization as a sensing mechanism in vertebrates. Using a mouse model of organic dust-induced airway inflammation, we found that the transcription factor serum response factor (SRF) localizes to motile cilia of airway epithelial cells and alters its localization in response to inflammatory stimuli. Furthermore, inhibition of SRF signaling using the small molecule CCG-1423 reduces organic dust-induced IL-8 release from bronchial epithelial cells and stimulates cilia beat frequency in ciliated mouse tracheal epithelial cells. Immunohistochemical analyses reveal that SRF localizes to the cilia of mouse brain ependymal and ovarian epithelial cells as well. These data reveal a novel mechanism by which a transcription factor localizes to motile cilia and modulates cell activities including cilia motility and inflammation response. These data challenge current dogma regarding motile cilia functioning and may lead to significant contributions in understanding motile ciliary signaling dynamics, as well as mechanisms involving SRF-mediated responses to inflammation and injury.
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Nordgren TM, Heires AJ, Wyatt TA, Poole JA, LeVan TD, Cerutis DR, Romberger DJ. Maresin-1 reduces the pro-inflammatory response of bronchial epithelial cells to organic dust. Respir Res 2013; 14:51. [PMID: 23663457 PMCID: PMC3668181 DOI: 10.1186/1465-9921-14-51] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Accepted: 05/08/2013] [Indexed: 12/14/2022] Open
Abstract
Background Exposure to organic dust causes detrimental airway inflammation. Current preventative and therapeutic measures do not adequately treat resulting disease, necessitating novel therapeutic interventions. Recently identified mediators derived from polyunsaturated fatty acids exhibit anti-inflammatory and pro-resolving actions. We tested the potential of one of these mediators, maresin-1 (MaR1), in reducing organic dust-associated airway inflammation. Methods As bronchial epithelial cells (BECs) are pivotal in initiating organic dust-induced inflammation, we investigated the in vitro effects of MaR1 on a human BEC cell line (BEAS-2B). Cells were pretreated for 1 hour with 0–200 nM MaR1, followed by 1–24 hour treatment with 5% hog confinement facility-derived organic dust extract (HDE). Alternatively, a mouse lung slice model was utilized in supportive cytokine studies. Supernatants were harvested and cytokine levels determined via enzyme-linked immunosorbent assays. Epithelial cell protein kinase C (PKC) isoforms α and ϵ, and PKA activities were assessed via radioactivity assays, and NFκB and MAPK-related signaling mechanisms were investigated using luciferase vector reporters. Results MaR1 dose-dependently reduced IL-6 and IL-8 production following HDE treatment of BECs. MaR1 also reduced HDE-stimulated cytokine release including TNF-α in a mouse lung slice model when given before or following HDE treatment. Previous studies have established that HDE sequentially activates epithelial PKCα and PKCϵ at 1 and 6 hours, respectively that regulated TNF-α, IL-6, and IL-8 release. MaR1 pretreatment abrogated these HDE-induced PKC activities. Furthermore, HDE treatment over a 24-hour period revealed temporal increases in NFκB, AP-1, SP-1, and SRE DNA binding activities, using luciferase reporter assays. MaR1 pretreatment did not alter the activation of NFκB, AP-1, or SP-1, but did reduce the activation of DNA binding at SRE. Conclusions These observations indicate a role for MaR1 in attenuating the pro-inflammatory responses of BECs to organic dust extract, through a mechanism that does not appear to rely on reduced NFκB, AP-1, or SP-1-related signaling, but may be mediated partly through SRE-related signaling. These data offer insights for a novel mechanistic action of MaR1 in bronchial epithelial cells, and support future in vivo studies to test MaR1’s utility in reducing the deleterious inflammatory effects of environmental dust exposures.
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Toews ML, Baker JI, Schulte NA, Heires AJ, Bidasee KR, Romberger DJ. Mechanisms of intracellular calcium elevation in human airway epithelial cells by an airway disease‐relevant extract of hog‐barn dust. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.913.49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Myron L. Toews
- PharmacologyUniversity of Nebraska Medical CenterOmahaNE
| | | | | | - Art J. Heires
- Internal MedicineUniversity of Nebraska Medical CenterOmahaNE
| | | | - Debra J. Romberger
- Internal MedicineUniversity of Nebraska Medical CenterOmahaNE
- VA Nebraska Western Iowa Healthcare SystemOmahaNE
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Dodmane PR, Schulte NA, Heires AJ, Band H, Romberger DJ, Toews ML. Airway epithelial epidermal growth factor receptor mediates hogbarn dust-induced cytokine release but not Ca2+ response. Am J Respir Cell Mol Biol 2011; 45:882-8. [PMID: 21441380 DOI: 10.1165/rcmb.2010-0419oc] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
A subset of workers in swine confinement facilities develops chronic respiratory disease. An aqueous extract of dust from these facilities (hogbarn dust extract [HDE]) induces IL-6 and IL-8 release and several other responses in isolated airway epithelial cells. The cell membrane receptors by which HDE initiates these responses have not been identified. Because several other inhaled agents induce airway epithelial cell responses through epidermal growth factor receptor (EGFR) activation, we hypothesized that HDE would activate EGFRs and that EGFRs would be required for some of the responses to HDE. Exposure of Beas-2B cells to HDE caused EGFR phosphorylation and downstream ERK activation, and both responses were blocked by the EGFR-selective kinase inhibitor AG1478. AG1478 and EGFR-neutralizing antibody reduced HDE-stimulated IL-6 and IL-8 release by about half. Similar EGFR phosphorylation and requirement of EGFRs for maximal IL-6 and IL-8 release were found with primary isolates of human bronchial epithelial cells. Because HDE-stimulated IL-6 and IL-8 release involve the Ca(2+)-dependent protein kinase Cα, we hypothesized that HDE would induce intracellular Ca(2+) mobilization. HDE exposure induced intracellular Ca(2+) mobilization in Beas-2B cells and in primary cell isolates, but this response was neither mimicked by EGF nor inhibited by AG1478. Thus, HDE activates EGFRs and their downstream signaling, and EGFR activation is required for some but not all airway epithelial cell responses to HDE.
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Affiliation(s)
- Puttappa R Dodmane
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198-5800, USA
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Zimbelman AC, Dodmane PR, Schulte NA, Heires AJ, Romberger DJ, Toews ML. Hog manure extract and porcine pancreatic elastase modulate airway epithelial cell EGF receptors, calcium signaling, and cytokine release. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.970.9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | - Art J. Heires
- Internal MedicineUniversity of Nebraska Medical CenterOmahaNE
- Omaha VA Medical CenterOmahaNE
| | - Debra J. Romberger
- Internal MedicineUniversity of Nebraska Medical CenterOmahaNE
- Omaha VA Medical CenterOmahaNE
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Dodmane PR, Ciborowski PS, Schulte NA, Heires AJ, Romberger DJ, Toews ML. Separation, characterization, and proteomic analysis of hog‐barn dust fractions to identify lung disease‐relevant mediators. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.970.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | - Art J. Heires
- Internal MedicineUniversity of Nebraska Medical CenterOmahaNE
- Omaha VA Medical CenterOmahaNE
| | - Debra J. Romberger
- Internal MedicineUniversity of Nebraska Medical CenterOmahaNE
- Omaha VA Medical CenterOmahaNE
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Ramachandran P, Heires AJ, DeSpiegelaere H, Romberger D, LeVan TD. TNF PRODUCTION IN WHOLE BLOOD IS INVERSELY ASSOCIATED WITH LUNG FUNCTION AMONG VETERANS WITH AGRICULTURAL WORK EXPOSURE. Chest 2007. [DOI: 10.1378/chest.132.4_meetingabstracts.600a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Allen-Gipson DS, Floreani AA, Heires AJ, Sanderson SD, MacDonald RG, Wyatt TA. Cigarette smoke extract increases C5a receptor expression in human bronchial epithelial cells. J Pharmacol Exp Ther 2005; 314:476-82. [PMID: 15843499 DOI: 10.1124/jpet.104.079822] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
We have shown that exposing human bronchial epithelial cells (HBECs) to 5% cigarette smoke extract (CSE) up-regulates C5a anaphylatoxin receptor (C5aR) expression as determined by flow cytometric analysis and immunohistochemistry. In this study, we conducted whole-cell saturation studies to quantitate the receptor number. After exposing an HBEC line (BEAS-2B) to CSE, radiolabeled C5a bound saturably with Kd = 2.71 +/- 1.03 nM (n = 4) and Bmax = 15,044 +/- 5702 receptors/cells. Without 5% CSE, no C5a binding was detected. Competitive binding studies revealed two classes of sites with distinct affinities for C5a (Ki1 = 3.28 x 10(-16) M; Ki2 = 1.60 x 10(-9) M). BEAS-2Bs were transfected with wild-type (WT) or mutant dominant-negative (DN) protein kinase C-alpha (PKC-alpha) to investigate the relationship between PKC-alpha and C5aR availability and affinity. Western blot analysis revealed a 75-kDa lysate band from cells expressing WT and DN PKC-alpha, but DN cells exposed to 5% CSE had no functional PKC activity. Pretreatment with Gö6976 [12-(2-cyanoethyl)-6,7,12,13-tetrahydro-13-methyl-5-oxo-5H-indolo(2,3-a)pyrrolo(3,4-c)-carbazole] (PKC-alpha inhibitor) had no effect on DN but significantly decreased WT PKC activity. Competitive binding studies conducted on either WT or DN PKC-alpha-transfected cells also revealed two classes of binding sites for C5a having different affinities. There was a significant rightward shift of the binding curve when WT cells were pretreated with Gö6976. These data suggest that C5aR is detectable on bronchial epithelial cells exposed to CSE and that exposure to CSE increases the availability of C5a binding sites. The data also indicate that PKC-alpha may play an important role in modulating C5aR binding.
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Affiliation(s)
- Diane S Allen-Gipson
- Pulmonary, Critical Care, and Sleep Medicine Section, Department of Internal Medicine, University of Nebraska Medical Center, 985815 Nebraska Medical Center, Omaha, NE 68198-5815, USA.
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Floreani AA, Wyatt TA, Stoner J, Sanderson SD, Thompson EG, Allen-Gipson D, Heires AJ. Smoke and C5a induce airway epithelial intercellular adhesion molecule-1 and cell adhesion. Am J Respir Cell Mol Biol 2003; 29:472-82. [PMID: 12714373 DOI: 10.1165/rcmb.2002-0143oc] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The human bronchial epithelial cell is one of the first cell types to be exposed to the irritants and toxins present in inhaled cigarette smoke. The ability of the bronchial epithelium to modulate inflammatory and immune events in response to cigarette smoke is important in the pathogenesis of smoke-induced airway injury. We have shown that cigarette smoke extract and the complement anaphylatoxin C5a both independently induce increased expression of intercellular adhesion molecule (ICAM)-1 on airway epithelial monolayers compared with unstimulated cells in vitro. This enhanced ICAM-1 expression is associated with a greater capacity of the airway epithelial cells to bind mononuclear cells, a process that appears to require the proinflammatory cytokine tumor necrosis factor-alpha and protein kinase C intracellular signaling. Exposure of epithelial monolayers to the combination of cigarette smoke followed by C5a results in an additive response for ICAM-1 expression and mononuclear cell adhesion compared with smoke or C5a challenge alone. Inhibiting C5a receptor expression can attenuate these responses. These findings suggest that smoke exposure in some way enhances the functional responsiveness of the C5a receptor expressed on these airway epithelial cells for subsequent C5a-mediated increases in ICAM-1 expression and mononuclear cell adhesion. Our results may help explain the initiation and propagation of inflammatory events in vivo induced by chronic airway exposure to cigarette smoke.
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MESH Headings
- Antigens, CD/metabolism
- Bronchi/cytology
- Cell Adhesion/drug effects
- Cell Adhesion/physiology
- Cells, Cultured
- Chemotaxis, Leukocyte/drug effects
- Chemotaxis, Leukocyte/immunology
- Complement C5a/metabolism
- Complement C5a/pharmacology
- Gene Expression Regulation/drug effects
- Humans
- Intercellular Adhesion Molecule-1/metabolism
- Leukocytes, Mononuclear/drug effects
- Leukocytes, Mononuclear/immunology
- Leukocytes, Mononuclear/metabolism
- Macrophages/drug effects
- Macrophages/immunology
- Macrophages/metabolism
- Pneumonia/etiology
- Protein Kinase C/antagonists & inhibitors
- Protein Kinase C/metabolism
- Pulmonary Disease, Chronic Obstructive/etiology
- Receptor, Anaphylatoxin C5a
- Receptors, Complement/antagonists & inhibitors
- Receptors, Complement/metabolism
- Respiratory Mucosa/drug effects
- Respiratory Mucosa/metabolism
- Respiratory Mucosa/physiopathology
- Smoke/adverse effects
- Nicotiana
- Tumor Necrosis Factor-alpha/antagonists & inhibitors
- Tumor Necrosis Factor-alpha/metabolism
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Affiliation(s)
- Anthony A Floreani
- Division of Pulmonary and Critical Care Medicine, School of Allied Health Professions, University of Nebraska Medical Center/Nebraska Health Systems, Omaha, NE 68198-5300, USA.
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Wyatt TA, Heires AJ, Sanderson SD, Floreani AA. Protein kinase C activation is required for cigarette smoke-enhanced C5a-mediated release of interleukin-8 in human bronchial epithelial cells. Am J Respir Cell Mol Biol 1999; 21:283-8. [PMID: 10423413 DOI: 10.1165/ajrcmb.21.2.3636] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Complement-derived anaphylatoxin C5a is a glycopolypeptide important in the regulation of inflammation. Previously, we have shown that C5a receptors (C5aR) are constitutively expressed on human bronchial epithelial cells (HBECs) grown in culture. We have also shown that the expression of C5aR is increased upon exposure of HBECs to 5% cigarette smoke extract (CSE), and that this subtoxic dose of CSE significantly enhances C5a-stimulated interleukin (IL)-8 release. To determine the intracellular signaling pathway of CSE + C5a-mediated IL-8 release, we assayed protein kinase C (PKC) activity of HBECs after exposing the cells to CSE and/or C5a. No increase in PKC activity was observed when HBECs were treated with 50 nM C5a for various times. However, PKC activity was increased by 2- to 3-fold in HBECs stimulated with 5% CSE for 1 h, as compared with cells incubated with medium only. No additional increase in PKC was observed when HBECs were treated with CSE and C5a together. When HBECs were pretreated with the PKC-specific inhibitor calphostin C (1 microM), no CSE-mediated PKC activation was observed. We then correlated PKC activation with IL-8 release in the same cells. Although HBECs required stimulation by both CSE and C5a to release maximal levels of IL-8, preincubation of CSE-stimulated HBECs with calphostin C inhibited IL-8 release by CSE + C5a. These results suggest that PKC activation by CSE alone does not result in IL-8 release, but that CSE-stimulated PKC activation is required for C5a-mediated IL-8 release from HBECs.
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Affiliation(s)
- T A Wyatt
- Research Service, Department of Veterans Affairs Medical Center, Omaha, Nebraska, USA.
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Sköld CM, Liu X, Umino T, Zhu Y, Ohkuni Y, Romberger DJ, Spurzem JR, Heires AJ, Rennard SI. Human neutrophil elastase augments fibroblast-mediated contraction of released collagen gels. Am J Respir Crit Care Med 1999; 159:1138-46. [PMID: 10194158 DOI: 10.1164/ajrccm.159.4.9805033] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In the present study, we tested the hypothesis that neutrophil elastase (NE) might mediate remodeling of extracellular matrix by affecting fibroblast-mediated contraction of three-dimensional collagen gels. Human lung fibroblasts were cast into type I collagen gels containing NE. After gelation, the gels were released into medium and the area was measured by image analyzer. NE augmented gel contraction (p < 0.001). This was not due to cell proliferation or to degradation to soluble collagen fragments because the amounts of DNA and hydroxyproline were not altered. alpha1-Protease inhibitor and the synthetic inhibitor of NE, L-680,833, when added in sufficient amount to inhibit free elastase activity, blocked the contraction induced by NE. Furthermore, neutrophil granulocytes (PMN) in coculture, as well as conditioned media from PMN, resulted in an increased contractility (p < 0.001 for both). Bronchoalveolar lavage fluid (BALF) from patients with increased PMN in their lower respiratory tract and free elastase activity had augmentive activity for gel contraction which could be partially blocked by the inhibitors. We conclude that NE augments fibroblast-mediated contraction of collagen gels. The findings support the notion that products secreted by PMN in inflammatory disorders may lead to rearrangement of extracellular matrix and could subsequently lead to tissue dysfunction.
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Affiliation(s)
- C M Sköld
- Pulmonary and Critical Care Medicine Section, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska, USA
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Floreani AA, Heires AJ, Welniak LA, Miller-Lindholm A, Clark-Pierce L, Rennard SI, Morgan EL, Sanderson SD. Expression of receptors for C5a anaphylatoxin (CD88) on human bronchial epithelial cells: enhancement of C5a-mediated release of IL-8 upon exposure to cigarette smoke. J Immunol 1998; 160:5073-81. [PMID: 9590258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Results are presented that demonstrate a heightened responsiveness of human bronchial epithelial cells (HBECs) toward the complement-derived anaphylatoxin C5a when these cells are exposed to cigarette smoke. This C5a response is possible because we show at both the protein and mRNA levels that HBECs constitutively express receptors for C5a (C5aR, CD88). Control (untreated) HBECs responded to C5a (50 nM) by releasing the proinflammatory cytokine IL-8 at low but significant levels. However, exposure of HBECs to 5% cigarette smoke extract (CSE) for at least 15 min resulted in an increase in the ability of an anti-human C5aR Ab to bind to the cell surface. CSE-treated HBECs responded in a dose-dependent fashion to human recombinant C5a and to a conformationally biased decapeptide agonist of C5a (YSFKPMPLaR) by releasing IL-8. The levels of IL-8 released in response to C5a were significantly greater in CSE-treated HBECs than in control HBECs. Moreover, this C5a-mediated release of IL-8 from CSE-treated HBECs was significantly reduced in the presence of the anti-human C5aR Ab. These results indicate that HBECs constitutively express C5aRs and that exposure to environmental irritants such as cigarette smoke modulates the expression and responsiveness of these C5aRs toward the C5a-mediated release of IL-8.
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Affiliation(s)
- A A Floreani
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha 68198, USA
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37
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Floreani AA, Heires AJ, Welniak LA, Miller-Lindholm A, Clark-Pierce L, Rennard SI, Morgan EL, Sanderson SD. Expression of Receptors for C5a Anaphylatoxin (CD88) on Human Bronchial Epithelial Cells: Enhancement of C5a-Mediated Release of IL-8 upon Exposure to Cigarette Smoke. The Journal of Immunology 1998. [DOI: 10.4049/jimmunol.160.10.5073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Results are presented that demonstrate a heightened responsiveness of human bronchial epithelial cells (HBECs) toward the complement-derived anaphylatoxin C5a when these cells are exposed to cigarette smoke. This C5a response is possible because we show at both the protein and mRNA levels that HBECs constitutively express receptors for C5a (C5aR, CD88). Control (untreated) HBECs responded to C5a (50 nM) by releasing the proinflammatory cytokine IL-8 at low but significant levels. However, exposure of HBECs to 5% cigarette smoke extract (CSE) for at least 15 min resulted in an increase in the ability of an anti-human C5aR Ab to bind to the cell surface. CSE-treated HBECs responded in a dose-dependent fashion to human recombinant C5a and to a conformationally biased decapeptide agonist of C5a (YSFKPMPLaR) by releasing IL-8. The levels of IL-8 released in response to C5a were significantly greater in CSE-treated HBECs than in control HBECs. Moreover, this C5a-mediated release of IL-8 from CSE-treated HBECs was significantly reduced in the presence of the anti-human C5aR Ab. These results indicate that HBECs constitutively express C5aRs and that exposure to environmental irritants such as cigarette smoke modulates the expression and responsiveness of these C5aRs toward the C5a-mediated release of IL-8.
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Affiliation(s)
| | - Art J. Heires
- *Internal Medicine, Division of Pulmonary and Critical Care Medicine,
| | | | - Amanda Miller-Lindholm
- ‡Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198; and
| | | | | | - Edward L. Morgan
- §Department of Immunology, Scripps Research Institute, La Jolla, CA 92037
| | - Sam D. Sanderson
- ‡Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE 68198; and
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Thompson AB, Mueller MB, Heires AJ, Bohling TL, Daughton D, Yancey SW, Sykes RS, Rennard SI. Aerosolized beclomethasone in chronic bronchitis. Improved pulmonary function and diminished airway inflammation. Am Rev Respir Dis 1992; 146:389-95. [PMID: 1489129 DOI: 10.1164/ajrccm/146.2.389] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Chronic bronchitis is associated with airways obstruction and inflammation. In order to determine whether aerosolized beclomethasone can modulate airway inflammation and diminish airway obstruction, subjects with chronic bronchitis performed spirometry and underwent bronchoalveolar lavage (BAL) before and after receiving 6 wk of therapy (five puffs four times a day) with either aerosolized beclomethasone (n = 20) or placebo (n = 10) in a double-blinded, randomized fashion. All subjects received aerosolized albuterol before each use of the study medications. Before BAL, the airways were visually assessed for the appearance of inflammation and assigned a score, the bronchitis index. BAL was performed by instilling five 20-ml aliquots of saline into each of three sites and pooling and separately analyzing the returns from the first aliquots to yield a "bronchial sample." The bronchial lavages were repeated in an additional three sites to increase the volume of fluid available for analysis. The fluid was prepared for cytologic examination by cytocentrifugation. Albumin (as a measure of epithelium permeability) and lactoferrin and lysozyme (as measures of serous cell activity) were measured in unconcentrated BAL fluid by enzyme-linked immunosorbent assay, and concentrations in epithelial lining fluid were estimated using urea as an internal marker for dilution. After treatment, the beclomethasone group, but not the placebo group, showed improvement in FVC (p = 0.02), FEV1 (p = 0.002), and 25 to 75% forced expiratory flow (p = 0.006). Associated with the improvement in spirometry, the bronchitis index fell (13.5 +/- 1.0 versus 10.75 +/- 1.1, p = 0.02) in the beclomethasone-treated group, but not the placebo-treated group.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- A B Thompson
- Department of Internal Medicine, University of Nebraska Medical Center, Omaha 68198
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