Bovine Milk-Derived Extracellular Vesicles Enhance Inflammation and Promote M1 Polarization Following Agricultural Dust Exposure in Mice

Details

• Personal Author:
  Heires AJ ; Nordgren TM ; Romberger DJ ; Swanson BJ ; Wichman C ; Zempleni J
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Agriculture Asthma Asthma, Occupational Blood Diet Dust Lung Macrophages Occupational Health Pathology Respiratory System Safety

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• Keywords:
  Agriculture Exposures Airway Obstruction Author Keywords: Organic Dust Chronic Inflammation Cytokines Dust Exposure IImmune Reaction In Vitro Studies Lung Cells Lung Inflammation Milk Extracellular Vesicles Organic Dusts

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• ISSN:
  0955-2863
• Document Type:
  Text
• Funding:
  Cooperative Agreement ; Grant
• Genre:
  Journal Article
• Place as Subject:
  California ; Nebraska ; OSHA Region 7 ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  110-120
• Volume:
  64
• NIOSHTIC Number:
  nn:20054841
• Citation:
  J Nutr Biochem 2019 Feb; 64:110-120
• Contact Point Address:
  Tara M. Nordgren, Pulmonary, Critical Care, Sleep and Allergy Division, Departmen of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198
• Email:
  tara.nordgren@medsch.ucr.edu
• Federal Fiscal Year:
  2019
• NORA Priority Area:
  Agriculture, Forestry and Fishing
• Performing Organization:
  University of Nebraska Medical Center - Omaha
• Peer Reviewed:
  True
• Start Date:
  20110901
• Source Full Name:
  The Journal of Nutritional Biochemistry
• End Date:
  20270831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:df30cf772618d4e3f0961c75e7c2bde642ca1394490cb210a8de7cba4332823b7f95d95a208889ec2f15d50be4a01f459bb0da1ddbc3dbcd8545ea6919e41a24
• Download URL:
  https://stacks.cdc.gov/view/cdc/217261/cdc_217261_DS1.pdf
• File Type:
  [PDF - 1.53 MB ]