Role of epidermal growth factor receptor signaling in RAS-driven melanoma

Nabeel Bardeesy, Minjung Kim, Jin Xu, Ryung Suk Kim, Qiong Shen, Marcus W. Bosenberg, Wing H. Wong, Lynda Chin

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

The identification of essential genetic elements in pathways governing the maintenance of fully established tumors is critical to the development of effective antioncologic agents. Previous studies revealed an essential role for H-RASV12G in melanoma maintenance in an inducible transgenic model. Here, we sought to define the molecular basis for RAS-dependent tumor maintenance through determination of the H-RASV12G-directed transcriptional program and subsequent functional validation of potential signaling surrogates. The extinction of H-RASV12G expression in established tumors was associated with alterations in the expression of proliferative, antiapoptotic, and angiogenic genes, a profile consistent with the observed phenotype of tumor cell proliferative arrest and death and endothelial cell apoptosis during tumor regression. In particular, these melanomas displayed a prominent RAS-dependent regulation of the epidermal growth factor (EGF) family, leading to establishment of an EGF receptor signaling loop. Genetic complementation and interference studies demonstrated that this signaling loop is essential to H-RASV12G-directed tumorigenesis. Thus, this inducible tumor model system permits the identification and validation of alternative points of therapeutic intervention without neutralization of the primary genetic lesion.

Original languageEnglish (US)
Pages (from-to)4176-4188
Number of pages13
JournalMolecular and cellular biology
Volume25
Issue number10
DOIs
StatePublished - May 2005
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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