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MTA3, a Mi-2/NuRD complex subunit, regulates an invasive growth pathway in breast cancer

Naoyuki Fujita1, David L Jaye, Masahiro Kajita

  • 1Emory University School of Medicine, Department of Pathology, Whitehead Biomedical Research Building, Room 142, 615 Michael Street, Atlanta, GA 30322, USA.

Cell
|April 23, 2003
PubMed

Insights

Estrogen receptor and MTA3 regulate breast cancer growth and differentiation. Their absence causes Snail to increase, promoting invasive growth by reducing E-cadherin.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Cell Biology

Background:

  • Estrogen receptor (ER) is vital for mammary gland development and a key target in breast cancer.
  • ER influences cell proliferation and differentiation through gene expression.
  • Understanding ER's downstream effectors is crucial for breast cancer therapy.

Purpose of the Study:

  • To identify novel estrogen-dependent regulators in breast epithelial cells.
  • To elucidate the role of MTA3 in ER-mediated pathways.
  • To establish a mechanistic link between ER status and breast cancer invasiveness.

Main Methods:

  • Investigated the role of human MTA3 in the Mi-2/NuRD transcriptional corepressor complex.
  • Analyzed the impact of estrogen receptor and MTA3 absence on Snail expression.
  • Assessed the effect of aberrant Snail expression on E-cadherin and epithelial architecture.

Main Results:

  • MTA3 identified as an estrogen-dependent component of the Mi-2/NuRD complex in breast cells.
  • Absence of ER or MTA3 leads to aberrant expression of the Snail repressor.
  • Aberrant Snail expression results in decreased E-cadherin, promoting invasive growth.

Conclusions:

  • MTA3 is a key mediator in an estrogen-dependent pathway controlling breast cell growth and differentiation.
  • Estrogen receptor and MTA3 pathway disruption links to invasive breast cancer phenotypes.
  • This study establishes a mechanistic connection between ER status and invasive growth in breast cancer.

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