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Analysis of Protein-protein Interactions and Co-localization Between Components of Gap, Tight, and Adherens Junctions in Murine Mammary Glands
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Claudin 1 in Breast Cancer: New Insights

Bowen Zhou1, Amanda Moodie2, Anne A A Blanchard3,4

  • 1Department of Pathology, Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E3P5, Canada. zhoub34@myumanitoba.ca.

Journal of Clinical Medicine
|December 4, 2015
PubMed

Insights

Claudin 1, a protein crucial for epithelial barrier function, has a complex role in breast cancer. While often downregulated, high levels in aggressive subtypes suggest it can drive cancer progression and metastasis.

Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • Claudin 1 is a transmembrane protein vital for epithelial barrier function and cell-cell communication.
  • Traditionally viewed as a tumor suppressor in breast cancer, its role is now understood to be more complex.
  • Aberrant claudin 1 expression is observed in various invasive breast cancers.

Purpose of the Study:

  • To review emerging insights into the multifaceted role of claudin 1 in breast cancer.
  • To explore claudin 1's involvement in cancer progression, collective migration, and epithelial mesenchymal transition (EMT).

Main Methods:

  • Literature review of recent studies on claudin 1 in breast cancer.
  • Analysis of data linking claudin 1 expression to breast cancer subtypes and progression.

Main Results:

  • Most invasive breast cancers show reduced or absent claudin 1.
  • Aggressive breast cancer subtypes can exhibit high claudin 1 levels.
  • Claudin 1 has a demonstrated causal role in the progression of certain breast cancer cell lines.

Conclusions:

  • Claudin 1's function in breast cancer is context-dependent and complex, not solely tumor suppressive.
  • Claudin 1 is implicated in key processes driving breast cancer metastasis, such as collective migration and EMT.

Keywords:
EMTbreast cancerclaudin 1collective migrationinteracting partners“high claudin”

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