title: EGF induces cell motility and multi-drug resistance gene expression in breast cancer cells.
abstract: The epidermal growth factor receptor (EGFR) is important for normal development, differentiation, and cell proliferation. Deregulation of EGFR has been observed in breast cancer. EGFR and signal pathways activated by these receptors have been associated with an advanced tumor stage and a poor clinical prognosis in breast cancer; however, the precise mechanisms responsible for this process are still not known. Here we show that treatment of MCF-7 breast cancer cells with EGF activated Akt and ERK, induced morphological changes, and increased cell motility. In addition, the constitutive expression of Raf-1 and the use of a MEK inhibitor demonstrated the participation of the Raf/MEK/ERK pathway in these processes. Importantly we detected that EGF induced MRP-1, 3, 5 and 7 gene expression and an increase in MRP1 promoter activity. In conclusion, treatment of MCF-7 breast cancer cells with EGF, in the absence of other growth factors, resulted in activation of EGFR signal transduction pathways; which were related with cell motility and drug resistance.
authors.affiliation: Department of Microbiology & Immunology, Brody School of Medicine at East Carolina University, Greenville, North Carolina 27858, USA.
authors.forename: Ruben
authors.initials: R
authors.lastname: Garcia
authors.forename: Richard A
authors.initials: RA
authors.lastname: Franklin
authors.forename: James A
authors.initials: JA
authors.lastname: McCubrey
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics; D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology*; D002465:Cell Movement / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D018432:Drug Resistance, Multiple / Q000235:genetics*; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D004789:Enzyme Activation / Q000187:drug effects; D004815:Epidermal Growth Factor / Q000494:pharmacology*; D066246:ErbB Receptors / Q000378:metabolism; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D006801:Humans; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects; D048490:raf Kinases / Q000378:metabolism
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D004815:Epidermal Growth Factor; D066246:ErbB Receptors; D048049:Extracellular Signal-Regulated MAP Kinases; D020929:Mitogen-Activated Protein Kinase Kinases; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D012333:RNA, Messenger; D048490:raf Kinases