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Updated: Aug 18, 2026

Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
08:53

Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1

Published on: February 17, 2011

Progesterone induces BRCA1 mRNA decrease, cell cycle alterations and apoptosis in the MCF7 breast cancer cell line

Yan Ansquer1, Agnès Legrand, Annie-France Bringuier

  • 1INSERM U 481, Faculté de Médecine Xavier Bichat, 75018 Paris, France. yan.ansquer@lmr.ap-hop-paris.fr

Anticancer Research
|April 9, 2005
PubMed
Abstract

Insights

High-dose progesterone down-regulates BRCA1 expression in breast cancer cells, impacting cell cycle and apoptosis. This suggests BRCA1 regulation is linked to cell cycle changes, not direct hormonal effects.

Area of Science:

  • Oncology
  • Molecular Biology
  • Endocrinology

Background:

  • BRCA1 gene mutations are linked to hereditary breast and ovarian cancers.
  • The role of BRCA1 in hormone-dependent organ cancer risk is not fully understood.
  • Investigating BRCA1 regulation by progesterone in breast cancer cells is crucial.

Purpose of the Study:

  • To determine if progesterone regulates BRCA1 expression in MCF7 breast cancer cells.
  • To explore the effects of different progesterone concentrations on cell behavior and BRCA1 levels.

Main Methods:

  • MCF7 cells were treated with 10(-4) M or 10(-10) M progesterone for 24 or 48 hours.
  • Analysis included BRCA1 expression, cell proliferation, apoptosis, and cell cycle progression.

Main Results:

  • High-dose progesterone (10(-4) M) reduced cell proliferation and induced apoptosis.
  • This high-dose treatment also decreased BRCA1 and cyclin A mRNA levels.
  • Low-dose progesterone (10(-10) M) had no significant effects.

Conclusions:

  • BRCA1 down-regulation by high-dose progesterone appears secondary to cell cycle alterations.
  • The study suggests progesterone does not directly regulate BRCA1 in this context.
  • Findings highlight the complex interplay between hormones, cell cycle, and BRCA1 in breast cancer.

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