NDLI: An NF-κB–Independent and Erk1/2-Dependent Mechanism Controls CXCL8/IL-8 Responses of Airway Epithelial Cells to Cadmium

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An NF-κB–Independent and Erk1/2-Dependent Mechanism Controls CXCL8/IL-8 Responses of Airway Epithelial Cells to Cadmium

Content Provider	PubMed Central
Author	Estelle, Cormet-boyaka Jolivette, Kalyn Astrid, Bonnegarde-bernard Jessica, Rennolds Hassan, Fatemat Mehta, Payal Susheela, Tridandapani Jeanette, Webster-marketon Boyaka, Prosper N.
Copyright Year	2012
Abstract	Airway epithelial cells in the lung are the first line of defense against pathogens and environmental pollutants. Inhalation of the environmental pollutant cadmium has been linked to the development of lung cancer and chronic obstructive pulmonary disease, which are diseases characterized by chronic inflammation. To address the role of airway epithelial cells in cadmium-induced lung inflammation, we investigated how cadmium regulates secretion of interleukin 8 (IL-8) by airway epithelial cells. We show that exposure of human airway epithelial cells to subtoxic doses of cadmium in vitro promotes a characteristic inflammatory cytokine response consisting of IL-8, but not IL-1β or tumor necrosis factor-alpha. We also found that intranasal delivery of cadmium increases lung levels of the murine IL-8 homologs macrophage inflammatory protein-2 and keracinocyte-dervied chemokine and results in an influx of Gr1+ cells into the lung. We determined that inhibition of the nuclear factor-κB (NF-κB) pathway had no effect on cadmium-induced IL-8 secretion by human airway epithelial cells, suggesting that IL-8 production was mediated through an NF-κB–independent pathway. Mitogen-activated protein kinases (MAPKs) are often involved in proinflammatory signaling. Cadmium could activate the main MAPKs (i.e., p38, JNK, and Erk1/2) in human airway epithelial cells. However, only pharmacological inhibition of Erk1/2 pathway or knockdown of the expression of Erk1 and Erk2 using small interfering RNAs suppressed secretion of IL-8 induced by cadmium. Our findings identify cadmium as a potent activator of the proinflammatory cytokine IL-8 in lung epithelial cells and reveal for the first time the role of an NF-κB–independent but Erk1/2-dependent pathway in cadmium-induced lung inflammation.
Related Links	http://dx.doi.org/10.1093/toxsci/kfr310
Ending Page	429
Page Count	12
Starting Page	418
File Format	PDF
ISSN	10966080
e-ISSN	10960929
Journal	Toxicological Sciences
Issue Number	2
Volume Number	125
Language	English
Publisher	Oxford University Press
Publisher Date	2012-02-01
Access Restriction	Open
Rights Holder	Oxford University Press
Subject Keyword	Toxicology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Toxicology

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An NF-κB–Independent and Erk1/2-Dependent Mechanism Controls CXCL8/IL-8 Responses of Airway Epithelial Cells to Cadmium

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