TWIST1, A novel androgen-regulated gene, is a target for NKX3-1 in prostate cancer cells

Turid Eide, Håkon Ramberg, Carlotta Glackin, Donald Tindall, Kristin Austlid Taskén

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Background: TWIST1 plays a key role in EMT-mediated tumor invasion and metastasis. Since bone metastasis is a hallmark of advanced prostate cancer and is detected in at least 85% of patients who die of this disease, it is of great importance to understand the regulation of the cellular signaling pathways involved in the metastatic process.Methods: Prostatic cell lines were analyzed using real time RT-PCR, chromatin immunoprecipitations (ChIP) and transfection of siRNA's and reporter constructs.Results: We report in this paper that TWIST1 is an androgen-regulated gene under tight regulation of NKX3-1. Androgens repress the expression of TWIST1 via NKX3-1, which is a prostate-specific tumor suppressor that is down-regulated in the majority of metastatic prostate tumors. We show that NKX3-1 binds to the TWIST1 promoter and that NKX3-1 over-expression reduces the activity of a TWIST1 promoter reporter construct, whereas NKX3-1 siRNA up-regulates endogenous TWIST1 mRNA in prostate cancer cells.Conclusion: Our finding that NKX3-1 represses TWIST1 expression emphasizes the functional importance of NKX3-1 in regulating TWIST1 expression during prostate cancer progression to metastatic disease.

Original languageEnglish (US)
Article number4
JournalCancer Cell International
Volume13
Issue number1
DOIs
StatePublished - Jan 31 2013

Keywords

  • LNCaP cells
  • NKX3-1
  • Prostate cancer
  • TWIST1

ASJC Scopus subject areas

  • Genetics
  • Oncology
  • Cancer Research

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