Regulation of Epidermal Growtrh Factor Receptor Signaling in Human Cancer Cells by MicroRNA-7

Rebecca Webster, Keith Giles, Karina Price, Priscilla Zhang, J.S. Mattick, Peter Leedman

Research output: Contribution to journalArticle

349 Citations (Scopus)

Abstract

The epidermal growth factor receptor (EGFR) is frequently overexpressed in cancer and is an important therapeutic target. Aberrant expression and function of microRNAs have been associated with tumorigenesis. Bioinformatic predictions suggest that the human EGFR mRNA 3′-untranslated region contains three microRNA-7 (miR-7) target sites, which are not conserved across mammals. We found that miR-7 down-regulates EGFR mRNA and protein expression in cancer cell lines (lung, breast, and glioblastoma) via two of the three sites, inducing cell cycle arrest and cell death. Because miR-7 was shown to decrease EGFR mRNA expression, we used microarray analysis to identify additional mRNA targets of miR-7. These included Raf1 and multiple other genes involved in EGFR signaling and tumorigenesis. Furthermore, miR-7 attenuated activation of protein kinase B (Akt) and extracellular signal-regulated kinase 1/2, two critical effectors of EGFR signaling, in different cancer cell lines. These data establish an important role for miR-7 in controlling mRNA expression and indicate that miR-7 has the ability to coordinately regulate EGFR signaling in multiple human cancer cell types.
Original languageEnglish
Pages (from-to)5731-41
JournalThe Journal of Biological Chemistry
Volume284
Issue number9
DOIs
Publication statusPublished - 2009

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