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Alcohol functionally upregulates Toll-like receptor 2 in airway epithelial cells.

Authors
Bailey-KL; Wyatt-TA; Romberger-DJ; Sisson-JH
Source
Alcohol Clin Exp Res 2009 Mar; 33(3):499-504
NIOSHTIC No.
20035515
Abstract
BACKGROUND: Alcoholics are known to have more severe airway diseases of the lung, such as bronchitis. Little is known about why this phenomenon is observed. We hypothesized that alcohol may modulate Toll-like receptor 2 (TLR2), which regulates inflammation caused by gram-positive bacteria. METHODS: Airway epithelial cells [primary bronchial epithelial cells (NHBE) and 16HBE 14o-] were exposed to 0 to 100 mM alcohol for 0 to 24 hours. Real time PCR was used to quantify TLR2 mRNA. Protein levels of TLR2 were determined using Western blots and fluorescence activated cell sorting (FACS) on cells exposed to 0, 50, and 100 mM alcohol. Finally, cells were "primed" with alcohol, stimulated with a TLR2 agonist (peptidoglycan), and interleukin 8 (IL-8) release was measured. RESULTS: Alcohol, at biologically relevant concentrations (25 to 100 mM), caused a 2 to 3-fold time- and concentration-dependent increase in TLR2 mRNA in normal human bronchial epithelial cells and 16HBE 14o- cells. Western blots for TLR2 revealed a qualitative increase in TLR2 protein in cells exposed to 100 mM alcohol. FACS showed that TLR2 was quantitatively increased on the surface of airway epithelial cells that were exposed to alcohol. Airway cells that were primed with alcohol produced nearly twice as much IL-8 in response to 40 ng of peptidoglycan than naive cells. CONCLUSIONS: Alcohol upregulates TLR2 message and protein in the airway epithelium. This leads to exaggerated inflammation in response to environmental stimuli that would normally be well tolerated in airway epithelial cells. This may be a partial explanation of why alcoholics have more severe airway disease than nonalcoholics.
Keywords
Alcoholic-beverages; Alcoholism; Biological-effects; Biological-monitoring; Cell-function; Cellular-reactions; Exposure-assessment; Exposure-levels; Exposure-methods; Inhalation-studies; Qualitative-analysis; Quantitative-analysis; Statistical-analysis; Substance-abuse; Author Keywords: TLR2; Ethanol; Pulmonary; Inflammation
Contact
Joseph H. Sisson, MD, University of Nebraska Medical Center, 985815 Nebraska Medical Center, Omaha, NE 68198-5815
CODEN
ACRSDM
Publication Date
20090301
Document Type
Journal Article
Email Address
jsisson@unmc.edu
Funding Type
Grant
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008539
Issue of Publication
3
ISSN
0145-6008
Priority Area
Agriculture, Forestry and Fishing
Source Name
Alcoholism: Clinical and Experimental Research
State
NE
Performing Organization
University of Nebraska
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