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Molecular and Cellular Biology, September 2001, p. 5958-5969, Vol. 21, No. 17
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.17.5958-5969.2001

Signal Pathways Which Promote Invasion and Metastasis: Critical and Distinct Contributions of Extracellular Signal-Regulated Kinase and Ral-Specific Guanine Exchange Factor Pathways

Yvona Ward,1 Warner Wang,1 Elisa Woodhouse,2 Ilona Linnoila,1 Lance Liotta,2 and Kathleen Kelly1,*

Cell and Cancer Biology Branch,1 and Laboratory of Pathology, Center for Cancer Research,2 National Cancer Institute, Bethesda, Maryland

Received 24 April 2001/Accepted 11 June 2001

Approximately 50% of metastatic tumors contain Ras mutations. Ras proteins can activate at least three downstream signaling cascades mediated by the Raf-MEK-extracellular signal-regulated kinase family, phosphatidylinositol-3 (PI3) kinase, and Ral-specific guanine nucleotide exchange factors (RalGEFs). Here we investigated the contribution of RalGEF and ERK activation to the development of experimental metastasis in vivo and associated invasive properties in vitro. Each pathway contributes distinct properties to the metastatic phenotype. Following lateral tail vein injection, 3T3 cells transformed by constitutively active Raf or MEK produced lung metastasis that displayed circumscribed, noninfiltrating borders. In contrast, 3T3 cells transformed by Ras(12V,37G), a Ras effector mutant that activates RalGEF but not Raf or P13 kinase, formed aggressive, infiltrative metastasis. Dominant negative RalB inhibited Ras(12V,37G)-activated invasion and metastasis, demonstrating the necessity of the RalGEF pathway for a fully transformed phenotype. Moreover, 3T3 cells constitutively expressing a membrane-associated form of RalGEF (RalGDS-CAAX) formed invasive tumors as well, demonstrating that activation of a RalGEF pathway is sufficient to initiate the invasive phenotype. Despite the fact that Ras(12V,37G) expression does not elevate ERK activity, inhibition of this kinase by a conditionally expressed ERK phosphatase demonstrated that ERK activity was necessary for Ras(12V,37G)-transformed cells to express matrix-degrading activity in vitro and tissue invasiveness in vivo. Therefore, these experiments have revealed a hitherto-unknown but essential interaction of the RalGEF and ERK pathways to produce a malignant phenotype. The generality of the role of the RalGEF pathway in metastasis is supported by the finding that Ras(12V,37G) increased the invasiveness of epithelial cells as well as fibroblasts.

* Corresponding author. Mailing address: Building 10, Room 3B43, Bethesda, MD 20892. Phone: (301) 435-4651. Fax: (301) 435-4655. E-mail: kkelly{at}helix.nih.gov.

Molecular and Cellular Biology, September 2001, p. 5958-5969, Vol. 21, No. 17
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.17.5958-5969.2001


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