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Molecular and Cellular Biology, September 1998, p. 5178-5188, Vol. 18, No. 9
0270-7306/98/$00.00+0

Tumor Promoter Arsenite Activates Extracellular Signal-Regulated Kinase through a Signaling Pathway Mediated by Epidermal Growth Factor Receptor and Shc

Wei Chen, Jennifer L. Martindale, Nikki J. Holbrook, and Yusen Liu*

Gene Expression and Aging Section, Laboratory of Biological Chemistry, National Institute on Aging, Baltimore, Maryland 21224

Received 29 December 1997/Returned for modification 18 February 1998/Accepted 18 June 1998

Although arsenite is an established carcinogen, the mechanisms underlying its tumor-promoting properties are poorly understood. Previously, we reported that arsenite treatment leads to the activation of the extracellular signal-regulated kinase (ERK) in rat PC12 cells through a Ras-dependent pathway. To identify potential mediators of the upstream signaling cascade, we examined the tyrosine phosphorylation profile in cells exposed to arsenite. Arsenite treatment rapidly stimulated tyrosine phosphorylation of several proteins in a Ras-independent manner, with a pattern similar to that seen in response to epidermal growth factor (EGF) treatment. Among these phosphorylated proteins were three isoforms of the proto-oncoprotein Shc as well as the EGF receptor (EGFR). Tyrosine phosphorylation of Shc allowed for enhanced interactions between Shc and Grb2 as identified by coimmunoprecipitation experiments. The arsenite-induced tyrosine phosphorylation of Shc, enhancement of Shc and Grb2 interactions, and activation of ERK were all drastically reduced by treatment of cells with either the general growth factor receptor poison suramin or the EGFR-selective inhibitor tyrphostin AG1478. Down-regulation of EGFR expression through pretreatment of cells with EGF also attenuated ERK activation and Shc tyrosine phosphorylation in response to arsenite treatment. These results demonstrate that the EGFR and Shc are critical mediators in the activation of the Ras/ERK signaling cascade by arsenite and suggest that arsenite acts as a tumor promoter largely by usurping this growth factor signaling pathway.

* Corresponding author. Mailing address: Gene Expression and Aging Section, Laboratory of Biological Chemistry, National Institute on Aging, Intramural Research Program, Gerontology Research Center, 5600 Nathan Shock Dr., Box 12, Baltimore, MD 21224. Phone: (410) 558-8442. Fax: (410) 558-8335. E-mail: yusen-liu{at}nih.gov.

Molecular and Cellular Biology, September 1998, p. 5178-5188, Vol. 18, No. 9
0270-7306/98/$00.00+0


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