HER3 is required for the maintenance of neuregulin-dependent and -independent attributes of malignant progression in prostate cancer cells

Marta Soler, Francesca Mancini, Oscar Meca-Cortes, Lourdes Sanchez-Cid, Nuria Rubio, Sonia Lopez-Fernandez, Juan Jose Lozano, Jeronimo Blanco, Pedro L. Fernandez, Timothy M. Thomson*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

34 Citations (Scopus)

Abstract

HER3 (ERBB3) is a catalytically inactive pseudokinase of the HER receptor tyrosine kinase family, frequently overexpressed in prostate and other cancers. Aberrant expression and mutations of 2 other members of the family, EGFR and HER2, are key carcinogenic events in several types of tumors, and both are well-validated therapeutic targets. In this study, we show that HER3 is required to maintain the motile and invasive phenotypes of prostate (DU-145) and breast (MCF-7) cancer cells in response to the HER3 ligand neuregulin-1 (NRG-1), epidermal growth factor (EGF) and fetal bovine serum. Although MCF-7 breast cancer cells appeared to require HER3 as part of an autocrine response induced by EGF and FBS, the response of DU-145 prostate cancer cells to these stimuli, while requiring HER3, did not appear to involve autocrine stimulation of the receptor. DU-145 cells required the expression of HER3 for efficient clonogenicity in vitro in standard growth medium and for tumorigenicity in immunodeficient mice. These observations suggest that prostate cancer cells derived from tumors that overexpress HER3 are dependent on its expression for the maintenance of major attributes of neoplastic aggressiveness, with or without cognate ligand stimulation. (c) 2009 UICC

Original languageEnglish
Pages (from-to)2565-2575
Number of pages11
JournalInternational Journal of Cancer
Volume125
Issue number11
DOIs
Publication statusPublished - 1 Dec 2009

Keywords

  • HER3
  • ERBB3
  • invasiveness
  • tumorigenicity
  • prostate
  • breast
  • EPIDERMAL-GROWTH-FACTOR
  • BREAST-CANCER
  • FACTOR RECEPTOR
  • ERBB RECEPTORS
  • PHOSPHATIDYLINOSITOL 3-KINASE
  • ANDROGEN-INDEPENDENCE
  • TAMOXIFEN RESISTANCE
  • IONIZING-RADIATION
  • GENE AMPLIFICATION
  • TUMOR-GROWTH

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