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Feedlot dust stimulation of interleukin-6 and -8 requires protein kinase Cepsilon in human bronchial epithelial cells.

Authors
Wyatt-TA; Slager-RE; Devasure-J; Auvermann-BW; Mulhern-ML; Von Essen-S; Mathisen-T; Floreani-AA; Romberger-DJ
Source
Am J Physiol, Lung Cell Mol Physiol 2007 Nov; 293(5):L1163-L1170
NIOSHTIC No.
20033015
Abstract
Individuals exposed to dusts from concentrated animal feeding operations report increased numbers of respiratory tract symptoms, and bronchoalveolar lavage samples from such individuals demonstrate elevated lung inflammatory mediators, including interleukin (IL)-8 and IL-6. We previously found that exposure of bronchial epithelial cells to hog barn dusts resulted in a protein kinase C (PKC)-dependent increase in IL-6 and IL-8 release. We hypothesized that cattle feedlot dusts would also generate bronchial epithelial interleukin release in vitro. To test this, we used interleukin ELISAs and direct PKC isoform assays. We found that a dust extract from cattle feedlots [feedlot dust extract (FLDE)] augments PKC activity of human bronchial epithelial cells in vitro. A 5-10% dilution of FLDE stimulated a significant release of IL-6 and IL-8 at 6-24 h in a PKC-dependent manner vs. control medium-treated cells. An increase in PKCalpha activity was observed with 1 h of FLDE treatment, and PKCepsilon activity was elevated at 6 h of FLDE exposure. The PKCalpha inhibitor, Gö-6976, did not inhibit FLDE-stimulated IL-8 and IL-6 release. However, the PKCepsilon inhibitor, Ro 31-8220, effectively inhibited FLDE-stimulated IL-8 and IL-6 release. Inhibition of FLDE-stimulated IL-6 and IL-8 was confirmed in a dominant-negative PKCepsilon-expressing BEAS-2B cell line but not observed in a PKCalpha dominant negative BEAS-2B cell line. These data support the hypothesis that FLDE exposure stimulates bronchial epithelial IL-8 and IL-6 release via a PKCepsilon-dependent pathway.
Keywords
Worker-health; Work-environment; Occupational-hazards; Safety-measures; Injury-prevention; Lung-burden; Lung-irritants; Bronchial-asthma; Dust-particles; Dusts; Agricultural-workers; Agricultural-processes; Lung-cells
Contact
D. J. Romberger, Research Service, VA Nebraska Western Iowa Health Care System (Omaha Div.), 4101 Woolworth Ave., Omaha, NE 68105
CODEN
APLPE7
Publication Date
20071101
Document Type
Journal Article
Email Address
dromberg@unmc.edu
Funding Type
Grant
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008539
Issue of Publication
5
ISSN
1040-0605
Priority Area
Agriculture, Forestry and Fishing
Source Name
American Journal of Physiology: Lung Cellular and Molecular Physiology
State
NE; TX
Performing Organization
University of Nebraska
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