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Gerald CL, McClendon CJ, Ranabhat RS, Waterman JT, Kloc LL, Conklin DR, Barton KT, Khatiwada JR, Williams LL. Sorrel Extract Reduces Oxidant Production in Airway Epithelial Cells Exposed to Swine Barn Dust Extract In Vitro. Mediators Inflamm 2019; 2019:7420468. [PMID: 31481850 PMCID: PMC6701418 DOI: 10.1155/2019/7420468] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/20/2019] [Accepted: 06/26/2019] [Indexed: 01/01/2023] Open
Abstract
Exposure to hog barn organic dust contributes to occupational lung diseases, which are mediated by inflammatory and oxidative stress pathways. Isoprostanes-a family of eicosanoids produced by oxidation of phospholipids by oxygen radicals-are biomarkers of pulmonary oxidative stress. Importantly, 8-isoprostane has been implicated as a key biomarker and mediator of oxidative stress because it is a potent pulmonary vasoconstrictor. Antioxidants found in fruits and vegetables hold promise for preventing or reducing effects of oxidative stress-related diseases including chronic bronchitis and chronic obstructive pulmonary disease (COPD). Here, we investigated 8-isoP and oxidant production by organic dust-exposed airway epithelial cells and the inhibitory effects of an extract from calyces of the sorrel plant, Hibiscus sabdariffa, on oxidant-producing pathways. Confluent cultures of normal human tracheobronchial epithelial cells were pretreated or not with 1% sorrel extract prior to 5% dust extract (DE) exposure. Following DE treatments, live cells, cell-free supernatants, or cell extracts were evaluated for the presence of 8-isoprostane, superoxide, hydrogen peroxide, nitric oxide, hydroxyl radical, peroxynitrite, and catalase activity to evaluate sorrel's inhibitory effect on oxidative stress. The well-known radical scavenging antioxidant, N-acetyl cysteine (NAC), was used for comparisons with sorrel. DE exposure augmented the production of all radicals measured including 8-isoprostane (p value < 0.001), which could be inhibited by NAC or sorrel. Among reactive oxygen and nitrogen species generated in response to DE exposure, sorrel had no effect on H2O2 production and NAC had no significant effect on NO· production. The observations reported here suggest a possible role for sorrel in preventing 8-isoprostane and oxidant-mediated stress responses in bronchial epithelial cells exposed to hog barn dust. These findings suggest a potential role for oxidative stress pathways in mediating occupational lung diseases and antioxidants within sorrel and NAC in reducing dust-mediated oxidative stress within the airways of exposed workers.
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Affiliation(s)
- Carresse L. Gerald
- Department of Animal Sciences, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
- Department of Energy and Environmental Systems, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
| | - Chakia J. McClendon
- Department of Animal Sciences, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
- Department of Energy and Environmental Systems, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
| | - Rohit S. Ranabhat
- Department of Animal Sciences, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
- Department of Energy and Environmental Systems, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
| | - Jenora T. Waterman
- Department of Animal Sciences, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
| | - Lauren L. Kloc
- Department of Animal Sciences, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
| | - Dawn R. Conklin
- Department of Animal Sciences, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
| | - Ke'Yona T. Barton
- Department of Animal Sciences, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC, USA
| | - Janak R. Khatiwada
- Center of Excellence for Post-Harvest Technologies, North Carolina Agricultural and Technical University, 500 Laureate Way, Kannapolis, NC, USA
| | - Leonard L. Williams
- Center of Excellence for Post-Harvest Technologies, North Carolina Agricultural and Technical University, 500 Laureate Way, Kannapolis, NC, USA
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Chandra D, Poole JA, Bailey KL, Staab E, Sweeter JM, DeVasure JM, Romberger DJ, Wyatt TA. Dimethylarginine dimethylaminohydrolase (DDAH) overexpression enhances wound repair in airway epithelial cells exposed to agricultural organic dust. Inhal Toxicol 2018; 30:133-139. [PMID: 29793367 DOI: 10.1080/08958378.2018.1474976] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
OBJECTIVE Workers exposed to dusts from concentrated animal feeding operations have a high prevalence of pulmonary diseases. These exposures lead to chronic inflammation and aberrant airway remodeling. Previous work shows that activating cAMP-dependent protein kinase (PKA) enhances airway epithelial wound repair while activating protein kinase C (PKC) inhibits wound repair. Hog barn dust extracts slow cell migration and wound repair via a PKC-dependent mechanism. Further, blocking nitric oxide (NO) production in bronchial epithelial cells prevents PKA activation. We hypothesized that blocking an endogenous NO inhibitor, asymmetric dimethylarginine, by overexpressing dimethylarginine dimethylaminohydrolase mitigates the effects of hog dust extract on airway epithelial would repair. MATERIALS/METHODS We cultured primary tracheal epithelial cells in monolayers from both wild-type (WT) and dimethylarginine dimethylaminohydrolase overexpressing C57Bl/6 (DDAH1 transgenic) mice and measured wound repair using the electric cell impedance sensing system. RESULTS Wound closure in epithelial cells from WT mice occurred within 24 h in vitro. In contrast, treatment of the WT cell monolayers with 5% hog dust extract prevented significant NO-stimulated wound closure. In cells from DDAH1 transgenic mice, control wounds were repaired up to 8 h earlier than seen in WT mice. A significant enhancement of wound repair was observed in DDAH cells compared to WT cells treated with hog dust extract for 24 h. Likewise, cells from DDAH1 transgenic mice demonstrated increased NO and PKA activity and decreased hog dust extract-stimulated PKC. DISCUSSION/CONCLUSION Preserving the NO signal through endogenous inhibition of asymmetric dimethylarginine enhances wound repair even in the presence of dust exposure.
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Affiliation(s)
- Deepak Chandra
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Jill A Poole
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Kristina L Bailey
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas.,b Research Service, Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha , NE Douglas
| | - Elizabeth Staab
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Jenea M Sweeter
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Jane M DeVasure
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas
| | - Debra J Romberger
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas.,b Research Service, Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha , NE Douglas
| | - Todd A Wyatt
- a Pulmonary, Critical Care, Sleep and Allergy Division, Department of Internal Medicine , University of Nebraska Medical Center , Omaha , NE Douglas.,b Research Service, Veterans Affairs Nebraska-Western Iowa Health Care System , Omaha , NE Douglas.,c Department of Environmental, Agricultural and Occupational Health , University of Nebraska Medical Center , Omaha , NE Douglas
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Pang M, Yuan Y, Wang D, Li T, Wang D, Shi X, Guo M, Wang C, Zhang X, Zheng G, Yu B, Wang H. Recombinant CC16 protein inhibits the production of pro-inflammatory cytokines via NF-κB and p38 MAPK pathways in LPS-activated RAW264.7 macrophages. Acta Biochim Biophys Sin (Shanghai) 2017; 49:435-443. [PMID: 28338974 PMCID: PMC5412021 DOI: 10.1093/abbs/gmx020] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Indexed: 02/06/2023] Open
Abstract
Accumulating evidence indicates that Clara cell protein-16 (CC16) has anti-inflammatory functions, although the involved molecular pathways have not been completely elucidated. Here, we evaluated the effect of recombinant rat CC16 (rCC16) on the expression of tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), and IL-8 in lipopolysaccharide (LPS)-stimulated mouse macrophages (RAW264.7 cells) and explored the underlying molecular mechanisms. It was found that rCC16 inhibited LPS-induced TNF-α, IL-6, and IL-8 expression at both the messenger ribonucleicacid (mRNA) level and protein level in a concentration-dependent manner, as demonstrated by real-time reverse transcriptase-polymerase chain reaction and enzyme-linked immunosorbent assay. Such suppressive effects were accompanied by the inhibition of transcriptional activity and the deoxyribonucleic acid binding activity of nuclear factor (NF)-κB but not activator protein (AP)-1. Western blot analysis further revealed that rCC16 inhibited the increase of nuclear NF-κB and the reduction of cytosolic NF-κB, the phosphorylation and reduction of NF-κB inhibitory protein IκBα, and the p38 mitogen-activated protein kinase (MAPK)-dependent NF-κB activation by phosphorylation at Ser276 of its p65 subunit. Furthermore, rCC16 was found to have no effect on the phosphorylation of c-Jun N-terminal kinase, c-Jun, or the nuclear translocation of c-Jun. In addition, reduction of TNF-α, IL-6, and IL-8 were reversed when the level of endogenous uteroglobin-binding protein was reduced by RNA interference in rCC16- and LPS-treated RAW264.7 cells. Our data suggest that rCC16 suppresses LPS-mediated inflammatory mediator TNF-α, IL-6, and IL-8 production by inactivating NF-κB and p38 MAPK but not AP-1 in RAW264.7 cells.
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Affiliation(s)
- Min Pang
- Department of Respiratory, The First Hospital, Shanxi Medical University, Taiyuan 030001, China
| | - Yangyang Yuan
- School of Basic Medicine, Shanxi Medical University, Taiyuan 030001, China
| | - Dong Wang
- Department of Respiratory, The First Hospital, Shanxi Medical University, Taiyuan 030001, China
| | - Ting Li
- Department of Respiratory, The First Hospital, Shanxi Medical University, Taiyuan 030001, China
| | - Dan Wang
- Department of Respiratory, The First Hospital, Shanxi Medical University, Taiyuan 030001, China
| | - Xiaohong Shi
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Min Guo
- Center of Laboratory Animal, Shanxi Medical University, Taiyuan 030001, China
| | - Chunfang Wang
- Center of Laboratory Animal, Shanxi Medical University, Taiyuan 030001, China
| | - Xinri Zhang
- Department of Respiratory, The First Hospital, Shanxi Medical University, Taiyuan 030001, China
| | - Guoping Zheng
- School of Basic Medicine, Shanxi Medical University, Taiyuan 030001, China
- Centre for Transplantation and Renal Research, Westmead Millennium Institute, University of Sydney, Sydney NSW 2145, Australia
| | - Baofeng Yu
- School of Basic Medicine, Shanxi Medical University, Taiyuan 030001, China
- Correspondence address. Tel/Fax: +86-351-4135772; E-mail: (H.W.)/Tel/Fax: +86-351-4135670; (B.Y.)
| | - Hailong Wang
- School of Basic Medicine, Shanxi Medical University, Taiyuan 030001, China
- Correspondence address. Tel/Fax: +86-351-4135772; E-mail: (H.W.)/Tel/Fax: +86-351-4135670; (B.Y.)
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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 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] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
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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