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Updated: Mar 13, 2026

Quantification of Breast Cancer Cell Invasiveness Using a Three-dimensional 3D Model
08:08

Quantification of Breast Cancer Cell Invasiveness Using a Three-dimensional 3D Model

Published on: June 11, 2014

16.4K

SIN3A and SIN3B differentially regulate breast cancer metastasis

Monica J Lewis1, Jianzhong Liu1, Emily Falk Libby1

  • 1Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA.

Oncotarget
|October 27, 2016
PubMed

Insights

SIN3 paralogs SIN3A and SIN3B have opposing roles in breast cancer metastasis. SIN3B suppresses metastasis, while SIN3A promotes it, offering potential therapeutic targets for triple-negative breast cancer.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • SIN3 corepressor complexes are crucial in development and breast cancer.
  • Two SIN3 paralogs, SIN3A and SIN3B, exist with distinct functions.
  • Their specific roles in breast cancer metastasis remain uncharacterized.

Purpose of the Study:

  • To investigate the individual roles of SIN3A and SIN3B in breast cancer progression and metastasis.
  • To identify unique molecular targets and pathways regulated by SIN3A and SIN3B.
  • To correlate SIN3A and SIN3B expression with patient survival outcomes.

Main Methods:

  • Stable knockdown of SIN3A and SIN3B using shRNA in cancer cells.
  • In vitro invasion assays (Transwell, 3D matrix).
  • In vivo experimental lung metastasis model.
  • RNA sequencing for target identification.
  • Microarray analysis of patient data.

Main Results:

  • SIN3B knockdown reduced cancer cell invasion and lung metastasis.
  • SIN3A knockdown increased cancer cell invasion and lung metastasis.
  • High SIN3A and low SIN3B expression correlated with longer relapse-free survival in triple-negative breast cancer patients.

Conclusions:

  • SIN3A and SIN3B exhibit opposing functions in regulating breast cancer metastasis.
  • SIN3A acts as a metastasis suppressor, while SIN3B promotes metastasis.
  • These findings highlight potential differential therapeutic strategies targeting SIN3 paralogs in breast cancer.
Keywords:
SIN3ASIN3Bbreast cancerinvasionmetastasis

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