The Hairy and Enhancer of Split homologue-1 (HES-1) mediates the proliferative effect of 17beta-estradiol on breast cancer cell lines

Oncogene. 2000 Nov 30;19(51):5951-3. doi: 10.1038/sj.onc.1203990.


The mechanism behind hormone dependent growth of breast cancer is presently not well understood. We show that the HES-1 protein level in the breast cancer cell lines T47D and MCF-7 is down regulated by 17beta-estradiol treatment. This regulation could be reversed by addition of the anti-estrogens 4OH tamoxifen, raloxifen and Imperial Chemical Industries (ICI) 182,780. In T47D cells with inducible exogenous HES-1 expression, induced expression of HES-1 protein prevented the proliferative effect of 17beta-estradiol and subsequent up regulation of proliferating cell nuclear antigen (PCNA). An inverse correlation between the HES-1 and PCNA protein levels respectively was found in colon cancer cell lines. These findings point to a potential role of HES-1 as a tumor suppressor in epithelial cells, and as a mediator of 17beta-estradiols proliferative effect on breast cancer cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Basic Helix-Loop-Helix Transcription Factors
  • Breast Neoplasms / metabolism
  • Breast Neoplasms / pathology*
  • Cell Division / drug effects
  • Cell Division / physiology
  • Down-Regulation / drug effects
  • Estradiol / pharmacology*
  • Estrogen Antagonists / pharmacology
  • Homeodomain Proteins / metabolism
  • Homeodomain Proteins / physiology*
  • Humans
  • Proliferating Cell Nuclear Antigen / metabolism
  • Transcription Factor HES-1
  • Tumor Cells, Cultured


  • Basic Helix-Loop-Helix Transcription Factors
  • Estrogen Antagonists
  • Homeodomain Proteins
  • Proliferating Cell Nuclear Antigen
  • Transcription Factor HES-1
  • HES1 protein, human
  • Estradiol