Chibby1 knockdown promotes mesenchymal-to-epithelial transition-like changes

Area of Science:

• Molecular Biology
• Cell Biology
• Oncology

Background:

• Chibby1 (Cby1) interacts with β-catenin, a key regulator in cell adhesion and Wnt signaling.
• Dysregulation of the Wnt/β-catenin pathway is implicated in various cancers, particularly gastrointestinal malignancies.

Purpose of the Study:

• To investigate the role of Cby1 in colorectal tumorigenesis.
• To determine the effect of Cby1 knockdown on colon cancer cell behavior and signaling pathways.

Main Methods:

• Stable Cby1-knockdown (K_D) SW480 colon cancer cells were generated.
• Cell morphology, cell-cell contacts, protein localization (E-cadherin, β-catenin, vimentin), and migratory behavior were assessed.
• Anchorage-independent growth was evaluated using soft agar assays.

Main Results:

• Cby1 K_D induced MET-like changes in SW480 and HEK293 cells, characterized by cuboidal morphology and tight cell-cell contacts.
• Increased plasma membrane localization of E-cadherin and β-catenin, decreased vimentin levels, and collective epithelial migration were observed.
• Anchorage-independent growth of Cby1 K_D cells was significantly reduced.

Conclusions:

• Chronic Cby1 knockdown promotes MET-like characteristics in colon cancer cells.
• Cby1 may play a role in counteracting colorectal tumor progression by influencing the MET process.