H. Alex Brown
Principle Investigator; Professor of Pharmacology, Chemistry, and Biochemistry; Associate Director, VICB;
Last active: 2/12/2015

FAM83B mediates EGFR- and RAS-driven oncogenic transformation.

Cipriano R, Graham J, Miskimen KL, Bryson BL, Bruntz RC, Scott SA, Brown HA, Stark GR, Jackson MW
J Clin Invest. 2012 122 (9): 3197-210

PMID: 22886302 · PMCID: PMC3428078 · DOI:10.1172/JCI60517

Aberrant regulation of growth signaling is a hallmark of cancer development that often occurs through the constitutive activation of growth factor receptors or their downstream effectors. Using validation-based insertional mutagenesis (VBIM), we identified family with sequence similarity 83, member B (FAM83B), based on its ability to substitute for RAS in the transformation of immortalized human mammary epithelial cells (HMECs). We found that FAM83B coprecipitated with a downstream effector of RAS, CRAF. Binding of FAM83B with CRAF disrupted CRAF/14-3-3 interactions and increased CRAF membrane localization, resulting in elevated MAPK and mammalian target of rapamycin (mTOR) signaling. Ablation of FAM83B inhibited the proliferation and malignant phenotype of tumor-derived cells or RAS-transformed HMECs, implicating FAM83B as a key intermediary in EGFR/RAS/MAPK signaling. Analysis of human tumor specimens revealed that FAM83B expression was significantly elevated in cancer and was associated with specific cancer subtypes, increased tumor grade, and decreased overall survival. Cumulatively, these results suggest that FAM83B is an oncogene and potentially represents a new target for therapeutic intervention.

MeSH Terms (31)

Amino Acid Sequence Animals Antineoplastic Agents Base Sequence Cell Line, Tumor Cell Proliferation Cell Transformation, Neoplastic Drug Resistance, Neoplasm Epithelial Cells ErbB Receptors Erlotinib Hydrochloride Gene Expression Gene Knockdown Techniques Humans Mammary Glands, Human Mice Mice, Inbred NOD Mice, SCID Molecular Sequence Data Neoplasm Proteins Neoplasms Neoplasm Transplantation Oligonucleotide Array Sequence Analysis Protein Structure, Tertiary Proto-Oncogene Proteins c-raf Quinazolines ras Proteins RNA Interference Signal Transduction TOR Serine-Threonine Kinases Transcriptome

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