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Am J Physiol Lung Cell Mol Physiol 281: L483-L489, 2001;
1040-0605/01 $5.00
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Vol. 281, Issue 2, L483-L489, August 2001

Activation of the EGF receptor signaling pathway in airway epithelial cells exposed to Utah Valley PM

Weidong Wu1, James M. Samet2, Andrew J. Ghio2, and Robert B. Devlin2

1 Center for Environmental Medicine and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill 27599; and 2 Human Studies Division, National Health Effects and Environmental Research Laboratory, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711

Exposure to ambient particulate matter (PM) in the Utah Valley has previously been associated with a variety of adverse health effects. To investigate intracellular signaling mechanisms for pulmonary responses to Utah Valley PM inhalation, human primary airway epithelial cells were exposed to aqueous extracts of PM collected from the year before (Y1), during (Y2), and after (Y3) the closure of a local steel mill located in the Utah Valley in this study. Transfection with kinase-deficient extracellular signal-regulated kinase (ERK) 1 constructs partially blocked Utah Valley PM-induced interleukin (IL)-8 promoter reporter activity. The mitogen-activated protein kinase/ERK kinase (MEK) activity inhibitor PD-98059 significantly abolished IL-8 released in response to Utah Valley PM, as did the epidermal growth factor (EGF) receptor kinase inhibitor AG-1478. Western blotting showed that Utah Valley PM induced phosphorylation of EGF receptor tyrosine, MEK1/2, and ERK1/2, which could be ablated with AG-1478 or PD-98059. For all findings, the potency of Utah Valley PM collected during Y2 was found to be lower relative to that of Y1 and Y3. These data demonstrate that Utah Valley PM can induce IL-8 expression partially through the activation of the EGF receptor signaling.

signal transduction; particulate matter; epidermal growth factor; mitogen-activated protein kinase; interleukin-8


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