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Originally published In Press as doi:10.1074/jbc.M202941200 on April 26, 2002

J. Biol. Chem., Vol. 277, Issue 27, 24225-24231, July 5, 2002
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A Novel Pathway for Nickel-induced Interleukin-8 Expression*

Aaron BarchowskyDagger , Nicole V. Soucy, Kimberley A. O'Hara, John Hwa, Trisha L. Noreault, and Angeline S. Andrew

From the Department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, New Hampshire 03755

Inhalation of particulate nickel subsulfide (Ni3S2) causes chronic active inflammation and fibrosis of the lungs. However, the mechanisms for these effects are not well understood. Therefore, cell culture experiments with BEAS-2B human airway epithelial cells were conducted to test the hypothesis that exposure to non-cytotoxic levels of Ni3S2 induces expression of inflammatory cytokines such as interleukin-8 (IL-8). Exposure to Ni3S2 for 48 h was required to significantly increase IL-8 protein levels. Transcriptional stimulation of IL-8 mRNA levels preceded the increase in protein. Transient exposure to soluble nickel sulfate failed to increase IL-8 mRNA. Transfection with truncated IL-8 promoter constructs linked to the luciferase gene demonstrated that nickel-induced IL-8 transcription required -272 bp of the promoter relative to the transcriptional start site. A -133-bp construct, containing cytokine and hypoxia-sensitive AP-1, NF-IL6, and NF-kappa B sites, was insufficient for induction by nickel. Transfection with a dominant negative AP-1 construct or mutation of the AP-1, GATA, or C/EBP sites in the -272-bp IL-8 promoter construct blocked induction by nickel. Inhibiting ERK, phosphatidylinositol 3-kinase, but not p38 kinase, diacylglycerol kinase, or hypoxia-inducible factor-1alpha , attenuated nickel induction of IL-8. These studies indicate that nickel induced IL-8 transcription through a novel pathway that requires both AP-1 and non-traditional transcription factors.

* This work was supported by the Superfund Basic Research Program at Dartmouth (Grant ES07373) and the facilities of the Norris Cotton Cancer Center.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger To whom correspondence should be addressed: Dept. of Pharmacology and Toxicology, Dartmouth Medical School, 7650 Remsen, Hanover, NH 03755-3835. Tel.: 603-650-1673; Fax: 603-650-1129; E-mail: barchowsky@dartmouth.edu.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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