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Protein coregulators that mediate estrogen receptor function.

T Ratajczak1

  • 1Department of Endocrinology and Diabetes, Sir Charles Gairdner Hospital, Nedlands, WA, Australia.

Reproduction, Fertility, and Development
|January 22, 2002
PubMed
Summary
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Estrogen receptors (ERs) interact with coactivators or corepressors to regulate gene transcription. An imbalance favoring coactivators may lead to antiestrogen resistance, impacting hormonal therapies.

Area of Science:

  • Molecular Endocrinology
  • Gene Regulation
  • Nuclear Receptor Signaling

Background:

  • Estrogen receptor alpha (ERα) and beta (ERβ) mediate estrogen responses.
  • Downstream coregulator proteins link nuclear hormone receptors to transcription machinery.

Purpose of the Study:

  • To elucidate the molecular mechanisms of estrogen and antiestrogen activity.
  • To propose a model for hormonal action involving coregulators.

Main Methods:

  • Review of recent findings on estrogen receptor function.
  • Integration of crystal structure data for ligand-bound receptors.

Main Results:

  • Activated receptors recruit coactivators (e.g., p300/CBP, P/CAF) enhancing transcription via histone acetylation.

Related Experiment Videos

  • Antiestrogen-bound receptors recruit corepressors (e.g., N-CoR, SMRT) repressing transcription via histone deacetylase activity.
  • A shift towards coactivator dominance may cause antiestrogen resistance.

    • Conclusions:

    • The balance of coactivator/corepressor recruitment is crucial for ER activity.
    • Understanding these interactions defines the molecular basis of hormonal effects and resistance.