Related Experiment Video

Updated: May 3, 2026

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

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ROCK inhibition activates MCF-7 cells

Seungwon Yang1, Hyun-Man Kim1

  • 1Laboratory for the Study of Molecular Biointerfaces, Department of Oral Histology and Developmental Biology, Program of Cell and Developmental Biology, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea.

Plos One
|February 14, 2014
PubMed

Insights

Dormant breast cancer cells can activate and spread via a non-canonical epithelial-mesenchymal transition (EMT) when Rho-associated kinase (ROCK) is inhibited. This process involves cell junction disruption and migration, bypassing typical EMT markers.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Dormant carcinoma cells can transition to a migratory state through epithelial-mesenchymal transition (EMT).
  • The molecular mechanisms driving dormant cancer cell activation remain incompletely understood.
  • Understanding these pathways is crucial for developing targeted therapies against cancer metastasis.

Purpose of the Study:

  • To investigate the molecular pathway responsible for activating dormant breast cancer cells.
  • To determine the role of Rho-associated kinase (ROCK) in the activation and dissemination of dormant cancer cells.
  • To explore the potential for non-canonical EMT in dormant cancer cell activation.

Main Methods:

  • Inhibition of Rho-associated kinase (ROCK) in dormant breast cancer cell models.
  • Assessment of cell junction integrity, proliferation, and migration/invasion in 2D and 3D cultures.
  • Analysis of key molecular markers including E-cadherin, β-catenin, Rac1, snail, and slug.

Main Results:

  • ROCK inhibition disrupted cell junctions and promoted proliferation and migration/invasion.
  • Disintegration of cell junctions and loss of E-cadherin/β-catenin from the cell membrane were observed upon ROCK inhibition.
  • ROCK inhibition led to Rac1 activation and increased cell migration/invasion.
  • Activation of MCF-7 cells did not involve the upregulation of typical EMT markers like snail and slug.

Conclusions:

  • ROCK inhibition can activate dormant breast cancer cells to disseminate via a non-canonical EMT.
  • The process involves cell junction disruption, Rac1 activation, and increased migration, independent of classical EMT markers.
  • Targeting ROCK activity may influence dormant cancer cell behavior and metastasis.

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