A novel antiestrogenic mechanism in progesterone receptor-transfected breast cancer cells

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An In Vitro Dormancy Model of Estrogen-sensitive Breast Cancer in the Bone Marrow: A Tool for Molecular Mechanism Studies and Hypothesis Generation
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An In Vitro Dormancy Model of Estrogen-sensitive Breast Cancer in the Bone Marrow: A Tool for Molecular Mechanism Studies and Hypothesis Generation

Published on: June 30, 2015

Ze-Yi Zheng1, Boon-Huat Bay, Swee-Eng Aw

  • 1School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, USA.

The Journal of Biological Chemistry
|February 25, 2005
PubMed

Insights

Estrogen normally controls progesterone receptor (PR) activity. However, PR expression independent of estrogen disrupted estrogen

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cancer Research

Background:

  • Progesterone receptor (PR) activity is typically estrogen-dependent.
  • Estrogen exposure is required for progesterone to become active in target cells.

Purpose of the Study:

  • To investigate the impact of estrogen-independent PR expression on estrogen's effects.
  • To explore the functional relationship between PR and estrogen receptor (ER).

Main Methods:

  • Transfection of PR into ER-positive MCF-7 cells.
  • Assessing estradiol-17beta (E2) growth stimulation and gene transcription (pS2, GREB1).
  • Promoter interference assays and High-Performance Liquid Chromatography (HPLC) analysis of E2 metabolism.

Main Results:

  • Estrogen-independent PR expression abolished E2-mediated growth stimulation and gene transcription.
  • PR transfection inhibited ER binding to estrogen response elements (ERE).
  • PR-transfected cells exhibited enhanced E2 metabolism and cellular uptake.

Conclusions:

  • Estrogen-independent PR exhibits antiestrogenic effects.
  • PR transfection alters E2 metabolism and cellular uptake.
  • This interaction suggests a novel therapeutic strategy for estrogen-dependent breast cancer.

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