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Loss of cell-cell adhesion triggers cell migration through Rac1-dependent ROS generation.

Yu-Hsuan Chen1,2, Jinn-Yuan Hsu1,2, Ching-Tung Chu1,2

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Summary
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Loss of cell adhesion triggers cell migration via reactive oxygen species (ROS) and vimentin expression. This ROS-Src-STAT3 pathway is crucial for head and neck cancer progression and metastasis.

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Molecular Biology

Background:

  • Epithelial cells initiate migration upon losing cell-cell adhesion, a process vital for wound healing and tumor metastasis.
  • The precise molecular mechanisms driving this migratory response after adhesion loss remain incompletely understood.
  • Understanding this process is critical for addressing pathological conditions like cancer metastasis.

Purpose of the Study:

  • To elucidate the signaling pathways involved in epithelial cell migration triggered by the loss of cell-cell adhesion.
  • To investigate the role of reactive oxygen species (ROS) and vimentin in this migratory process using head and neck squamous cell carcinoma (HNSCC) cells.
  • To explore the clinical relevance of identified pathways in HNSCC patient tumors.

Main Methods:

  • Utilized human head and neck squamous cell carcinoma (HNSCC) SAS cells as a model system.
  • Investigated the generation of reactive oxygen species (ROS) and vimentin expression following loss of cell-cell adhesion.
  • Analyzed the Tiam1-Rac1 signaling axis and its role in ROS production via NADPH-dependent oxidases.
  • Examined the ROS-Src-STAT3 signaling pathway's contribution to vimentin expression and cell migration.
  • Assessed the activation status of ROS, Src, and STAT3 in HNSCC tumor biopsies.

Main Results:

  • Loss of cell-cell adhesion in SAS cells induced both ROS generation and vimentin expression, which were essential for migration.
  • Tiam1-mediated Rac1 activation was identified as the driver of ROS generation through NADPH oxidases.
  • The ROS-Src-STAT3 pathway was found to be critical for inducing vimentin expression and subsequent cell migration.
  • Elevated levels of ROS, Src, and STAT3 activation were observed in HNSCC patient tumor samples.
  • Activated STAT3 was notably concentrated at the tumor invasive front, correlating with metastatic progression.

Conclusions:

  • A novel mechanism for triggering cell migration upon loss of cell-cell adhesion has been uncovered, involving ROS generation and vimentin expression.
  • The ROS-Src-STAT3 signaling pathway plays a significant role in driving cell migration and is implicated in the progression of HNSCC.
  • Targeting the ROS-Src-STAT3 pathway presents a potential therapeutic strategy for inhibiting head and neck cancer metastasis.