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Effect of elevated carbon dioxide on bronchial epithelial innate immune receptor response to organic dust from swine confinement barns.

Schneberger D; Cloonan D; DeVasure JM; Bailey KL; Romberger DJ; Wyatt TA
Int Immunopharmacol 2015 Jul; 27(1):76-84
Hypercapnia is known to have immunoregulatory effects within the lung. Cell culture systems demonstrate this in both macrophages and alveolar cell lines, suggesting that the alveoli are affected by changes in CO2 levels. We hypothesized that hypercapnia would also modulate human bronchial epithelial cell immune responses. Innate immune responses to Pam3CSK4 (TLR2 ligand), LPS (TLR4 ligand) and a complex innate immune stimulus, an extract from the organic dust of swine confinement barns (barn dust extract or BDE), were tested in a human bronchial epithelial cell line, BEAS-2B. Both TLR ligands showed a decrease in IL-6 and IL-8 production, and an increase in MCP-1 in response to elevated CO2 indicating an enhancement in cytokine production to hypercapnia. This change was not reflected in expression levels of TLR receptor RNA which remained unchanged in response to elevated CO2. Interestingly, barn dust showed an increase in IL-6, IL-8 and MCP-1 response at 9% CO2, suggesting that elevated CO2 exerts different effects on different stimuli. Our results show that airway epithelial cell immune responses to barn dust respond differently to hypercapnic conditions than individual TLR ligands.
Humans; Agriculture; Agricultural-workers; Organic-dusts; Animals; Lung-tissue; Lung-disorders; Lung-disease; Lung; Dusts; Dust-exposure; Pathology; Animal-husbandry; Animal-husbandry-workers; Immune-reaction; Respiratory-system-disorders; Pulmonary-system-disorders; Cellular-reactions; Genes; Laboratory-testing; Pharmacology; Alveolar-cells; Carbon-compounds; Dioxides; Respiration; Blood-stream; Author Keywords: Hypercapnia; TLR; LPS; Barn dust; Carbon dioxide; Lung; Bronchial epithelium
Todd A. Wyatt, Pulmonary, Critical Care, Sleep & Allergy Division, Department of Internal Medicine, University of Nebraska Medical Center, 985910 The Nebraska Medical Center, Omaha, NE 68198-5910, United States
Publication Date
Document Type
Journal Article
Email Address
Funding Type
Grant; Cooperative Agreement
Fiscal Year
Identifying No.
Grant-Number-R01-OH-008539; Cooperative-Agreement-Number-U54-OH-010162
Issue of Publication
Priority Area
Agriculture, Forestry and Fishing
Source Name
International Immunopharmacology
Performing Organization
University of Nebraska Medical Center, Omaha, Nebraska
Page last reviewed: May 11, 2023
Content source: National Institute for Occupational Safety and Health Education and Information Division