Runx2 regulates survivin expression in prostate cancer cells

Lab Invest. 2010 Feb;90(2):222-33. doi: 10.1038/labinvest.2009.128. Epub 2009 Nov 30.

Abstract

Previously we described that bone morphogenetic protein-7 (BMP7) could protect prostate cancer C4-2B cells from serum starvation-induced apoptosis via survivin induction. Here, for the first time, we identify Runx2 as a key regulator of survivin transcription. In C4-2B cells grown normally, suppression of Runx2 reduced survivin expression. Using ChIP assays, two regions of the survivin promoter, -1953 to -1812 (I) and -1485 to -1119 (II) encompassing consensus Runx-binding sites were examined. Runx2 was found to be associated with both regions, with a stronger affinity to region-I. In serum-starved cells neither region was occupied, but BMP7 restored association to region-II and not region-I. In reporter assays, transcription activity by BMP7 was significantly reduced when sequences including binding sites of region-II were deleted. Additionally, Runx2 expression was enhanced by BMP7 in these cells. Along with a strong survivin expression, a trend in increased Runx2 expression in human prostate cancer cells and tissues was noted. In the conditional Pten-knockout mouse, Runx2 level increased with growth of prostate tumor. The data define a novel role of Runx2 in regulating survivin expression in malignant epithelial cells and identify it as a critical factor in BMP signaling that protects cancer cells against apoptosis.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adenocarcinoma / metabolism*
  • Animals
  • Apoptosis
  • Bone Morphogenetic Protein 7 / physiology
  • Cell Line, Tumor
  • Core Binding Factor Alpha 1 Subunit / metabolism*
  • Humans
  • Inhibitor of Apoptosis Proteins
  • Male
  • Mice
  • Microtubule-Associated Proteins / metabolism*
  • Prostatic Neoplasms / metabolism*
  • Protein Array Analysis
  • Survivin
  • Transfection
  • Up-Regulation

Substances

  • BIRC5 protein, human
  • Bone Morphogenetic Protein 7
  • Core Binding Factor Alpha 1 Subunit
  • Inhibitor of Apoptosis Proteins
  • Microtubule-Associated Proteins
  • RUNX2 protein, human
  • Survivin