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Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
16:24

Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells

Published on: February 21, 2014

Effects of exon-deleted estrogen receptor beta transcript variants on growth, apoptosis and gene expression of human

Oliver Treeck1, Ingolf Juhasz-Boess, Claus Lattrich

  • 1Department of Obstetrics and Gynecology, University of Regensburg, Landshuter Str. 65, 93053 Regensburg, Germany. otreeck@caritasstjosef.de

Breast Cancer Research and Treatment
|September 19, 2007
PubMed

Insights

Estrogen receptor beta 1 (ERbeta1) exhibits significant anti-tumor effects in breast cancer cells, while its exon-deleted variants do not impact cell growth or apoptosis. ERbeta1 demonstrates potential as a therapeutic target for both ERalpha-positive and -negative breast cancers.

Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • The estrogen receptor beta (ERbeta) gene produces multiple transcript isoforms via alternative splicing.
  • These ERbeta isoforms are present in mammary glands and breast cancer cells, influencing cellular functions.
  • Understanding the distinct roles of ERbeta isoforms is crucial for breast cancer research.

Purpose of the Study:

  • To investigate the functional differences between ERbeta1 and two newly identified exon-deleted ERbeta isoforms.
  • To compare their effects on the growth, apoptosis, and gene expression of breast cancer cell lines with varying ERalpha status.
  • To evaluate the potential of ERbeta isoforms as therapeutic targets in breast cancer.

Main Methods:

  • Overexpression of ERbeta1 and exon-deleted ERbeta variants in ERalpha-positive (MCF-7) and ERalpha-negative (SK-BR-3) breast cancer cell lines.
  • Assessment of cell growth, apoptosis induction (basal and tamoxifen-induced), and gene expression (cyclins, p21, PR).
  • Analysis of estrogen response element (ERE) activation by the different ERbeta isoforms.

Main Results:

  • ERbeta1 overexpression demonstrated significant anti-tumoral effects, slowing growth and increasing apoptosis in both cell lines.
  • Exon-deleted ERbeta variants did not affect cell growth, proliferation, or tamoxifen response.
  • ERbeta1 modulated the expression of key regulatory genes, whereas the variants did not influence ERE activation or gene expression.

Conclusions:

  • ERbeta1 possesses potent anti-cancer properties against both ERalpha-positive and ERalpha-negative breast cancer cells.
  • The exon-deleted ERbeta isoforms lack the anti-proliferative and pro-apoptotic functions of ERbeta1.
  • ERbeta1's ability to exert anti-tumoral actions supports its potential as a therapeutic agent in diverse breast cancer subtypes.

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