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p33ING1b and estrogen receptor (ER) alpha.

Tatsuya Toyama1, Hirotaka Iwase

  • 1Department of Breast Surgery, Aichi Cancer Center Hospital, 1-1 Kanokoden, Chikusa-ku, Nagoya 464-8681, Japan. toyamat-ncu@umin.ac.jp

Breast Cancer (Tokyo, Japan)
|January 14, 2004
PubMed
Summary

The ING1 gene

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Epigenetics

Background:

  • The ING1 gene is investigated for its role in tumor suppression and chromatin remodeling.
  • ING1 proteins interact with histone acetyltransferases (HATs) and histone deacetylases (HDACs).
  • Specific ING1 isoforms, p33ING1b and p47ING1a, exhibit distinct effects on histone acetylation.

Purpose of the Study:

  • To investigate the role of p33ING1b in modulating the transcriptional activity of estrogen receptor alpha (ERα).
  • To determine if p33ING1b functions as a coactivator for ERα.
  • To elucidate the domain of ERα involved in p33ING1b-mediated activation.

Main Methods:

  • Transfection of cells with varying concentrations of a p33ING1b expression vector.
  • Assessing estrogen-induced ERα transcriptional activity using reporter gene assays.
  • Analyzing the effect of p33ING1b on ERα deletion mutants (AF1 and AF2).

Main Results:

  • Estrogen-induced ERα transcriptional activity increased in a dose-dependent manner with p33ING1b expression.
  • p33ING1b enhanced transcription mediated by full-length ERα and the AF1 deletion mutant.
  • The AF2 domain of ERα was crucial for the enhancement of transcriptional activity by p33ING1b.

Conclusions:

  • p33ING1b acts as a coactivator for ERα.
  • p33ING1b stimulates estrogen-induced ERα transcriptional activity via the AF2 domain.
  • These findings support a role for p33ING1b in chromatin remodeling related to ERα function.

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