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Suppression of estrogen receptor-alpha transactivation by thyroid transcription factor-2 in breast cancer cells

Eunsook Park1, Eun-Yeung Gong, Maria Grazia Romanelli

  • 1Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea.

Biochemical and Biophysical Research Communications
|April 24, 2012
PubMed

Insights

Thyroid transcription factor-2 (TTF-2) acts as an estrogen receptor alpha (ERα) co-repressor in breast cancer cells. TTF-2 inhibits ERα activity, reducing proliferation and target gene expression.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cancer Research

Background:

  • Estrogen receptors (ERs) regulate cell growth and are crucial in hormone-responsive tumors.
  • ERα activity is modulated by interactions with various cellular factors.

Purpose of the Study:

  • To investigate the role of thyroid transcription factor-2 (TTF-2) in ERα function.
  • To determine if TTF-2 acts as a co-regulator for ERα in mammary cells.

Main Methods:

  • Expression analysis of TTF-2 in mammary gland.
  • Inhibition assays of ERα transactivation in MCF-7 breast cancer cells.
  • Co-immunoprecipitation to assess ERα-TTF-2 complex formation.
  • Analysis of ERα target gene expression (pS2, cyclin D1) and cell proliferation in MCF-7/TTF-2 cells.

Main Results:

  • TTF-2 is expressed in the mammary gland and functions as an ERα co-repressor.
  • TTF-2 dose-dependently inhibited ERα transactivation and directly bound to ERα in the nucleus.
  • TTF-2 repressed ERα target genes (pS2, cyclin D1) by disrupting ERα promoter binding.
  • TTF-2 significantly decreased MCF-7 cell proliferation.

Conclusions:

  • TTF-2 acts as an ERα co-repressor in mammary cells.
  • TTF-2 modulates ERα function and plays a role in ER-dependent mammary cell proliferation.
  • TTF-2 represents a potential therapeutic target for ER-positive breast cancers.

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