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The SWI/SNF ATPases Are Required for Triple Negative Breast Cancer Cell Proliferation.

Qiong Wu1, Pasil Madany1, Jacqueline Akech1

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Brahma (BRM) and Brahma-related Gene 1 (BRG1) ATPases are overexpressed in breast cancer. Targeting these chromatin remodelers inhibits tumor growth and cell proliferation, highlighting their essential role in cancer progression.

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Chromatin Remodeling

Background:

  • SWI/SNF chromatin remodeling enzymes are crucial for gene regulation.
  • BRM and BRG1 ATPases are key catalytic subunits of human SWI/SNF complexes.
  • Alterations in SWI/SNF subunits are implicated in various cancer types.

Purpose of the Study:

  • To investigate the role of BRM and BRG1 ATPases in breast cancer.
  • To determine the effect of targeting BRM and BRG1 on triple-negative breast cancer cells.

Main Methods:

  • Analysis of BRG1 and BRM expression in primary breast cancers.
  • In vivo and in vitro experiments involving knockdown of BRM and BRG1 in triple-negative breast cancer cells.
  • CRISPR/Cas9 technology for gene knockout of BRM and BRG1.

Main Results:

  • BRG1 and BRM are overexpressed in most primary breast cancers, irrespective of receptor status.
  • Knockdown of BRM or BRG1 reduced tumor formation and cell proliferation.
  • Cells exhibited fewer cells in S phase and prolonged cell cycle progression without apoptosis or senescence.
  • Combined knockdown demonstrated additive effects on proliferation and cell cycle.
  • BRM or BRG1 knockout led to loss of cell viability.

Conclusions:

  • BRM and BRG1 ATPases are oncogenic drivers in triple-negative breast cancer.
  • These ATPases are essential for cell proliferation and viability in this cancer subtype.
  • Targeting BRM and BRG1 represents a potential therapeutic strategy for breast cancer.