Repetitive Organic Dust Exposure In Vitro Impairs Macrophage Differentiation and Function

Details

• Personal Author:
  Alexis NE ; Allen-Gipson D ; Fey PD ; Gentry-Nielsen MJ ; Larsson L ; MacInnes AK ; Parks C ; Poole JA ; Romberger DJ ; Von Essen SG
• Description:
  BACKGROUND: Organic dust exposure in the agricultural industry results in significant airway disease and lung function decrease. Mononuclear phagocytes are key cells that mediate the inflammatory and innate immune response after dust exposure. OBJECTIVE: We sought to investigate the effect of organic dust extract (ODE) from modern swine operations on monocyte-derived macrophage (MDM) phenotype and function. METHODS: Peripheral blood monocytes were obtained by means of elutriation methodology (>99% CD14(+)) and differentiated into macrophages in the presence of GM-CSF (1 week) with and without ODE (0.1%). At 1 week, cells were analyzed by means of flow cytometry for cell-surface marker expression (HLA-DR, CD80, CD86, Toll-like receptor 2, Toll-like receptor 4, mCD14, and CD16), phagocytosis (IgG-opsonized zymosan particles), and intracellular killing of Streptococcus pneumoniae. At 1 week, MDMs were rechallenged with high-dose ODE (1%), LPS, and peptidoglycan (PGN), and cytokine levels (TNF-alpha, IL-6, IL-10, and CXCL8/IL-8) were measured. Comparisons were made to MDMs conditioned with heat-inactivated dust, endotoxin-depleted dust, LPS, and PGN to elucidate ODE-associated factors. RESULTS: Expression of HLA-DR, CD80, and CD86; phagocytosis; and intracellular bacterial killing were significantly decreased with ODE-challenged versus control MDMs. Responses were retained after marked depletion of endotoxin. PGN, LPS, and PGN plus LPS significantly reduced MDM surface marker expression and, except for LPS alone, also reduced phagocytosis. ODE-challenged MDMs had significantly diminished cytokine responses (TNF-alpha, IL-6, and IL-10) after repeat challenge with high-dose ODE. Cross-tolerant cytokine responses were also observed. CONCLUSION: Repetitive organic dust exposure significantly decreases markers of antigen presentation and host defense function in MDMs. Bacterial cell components appear to be driving these impaired responses. [Description provided by NIOSH]
• Subjects:
  Agriculture Antigens Asthma Asthma, Occupational Bacteria Dust Lung Occupational Health Particulate Matter Respiratory System Respiratory Tract Diseases Safety

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• Keywords:
  Agricultural-workers Antifungals Bacterial-dusts Bronchial-asthma Cell-biology Cell-function Cell-migration Dust-particles Dusts Lung-burden Lung-cells Lung-irritants Organic-dusts Particle-aerodynamics Particulate-dust Particulates Pulmonary-system-disorders Respiratory-system-disorders Statistical-analysis

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• ISSN:
  0091-6749
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Nebraska ; North Carolina ; OSHA Region 4 ; OSHA Region 7
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  375-382
• Volume:
  122
• Issue:
  2
• NIOSHTIC Number:
  nn:20034373
• Citation:
  J Allergy Clin Immunol 2008 Aug; 122(2):375-382
• Contact Point Address:
  Jill A. Poole, Pulmonary, Critical Care, Sleep and Allergy Section, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198-5300
• Email:
  japoole@unmc.edu
• Federal Fiscal Year:
  2008
• NORA Priority Area:
  Agriculture, Forestry and Fishing
• Performing Organization:
  University of Nebraska Medical Center, Omaha, Nebraska
• Peer Reviewed:
  True
• Start Date:
  20060801
• Source Full Name:
  Journal of Allergy and Clinical Immunology
• End Date:
  20160731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:e9707a84c06a84209475c4385e7ebdd02d65569466849f3844efdff090b8c658f0ef7051f9e99803ca9ad7bd86c720b087de48a116394d3216c0a99901e12118
• Download URL:
  https://stacks.cdc.gov/view/cdc/189601/cdc_189601_DS1.pdf
• File Type:
  [PDF - 835.35 KB ]