Visualizing Cytoskeletal Protein Reconstruction of Vulvar Cancer with Surface-Enhanced Raman Spectroscopy and Gold...

Area of Science:

• Cell Biology
• Cancer Research
• Spectroscopy

Background:

• Epithelial-mesenchymal transition (EMT) is crucial for epithelial cancer metastasis.
• EMT involves changes in cell adhesion (E-cadherin loss) and cytoskeletal proteins (vimentin gain).
• Clobetasol, a corticosteroid, is used for chronic vulvar rashes.

Purpose of the Study:

• To investigate clobetasol's effect on EMT in A431 vulvar cancer cells.
• To utilize 3D Surface-Enhanced Raman Scattering (SERS) imaging to monitor EMT-associated protein changes.
• To establish Raman imaging as a method for identifying cells undergoing EMT.

Main Methods:

• A431 vulvar cancer cells were treated with clobetasol to induce EMT (A431D cells).
• 3D SERS imaging using colloidal gold nanoparticles was employed to track protein expression and interactions.
• Spectral analysis was performed to determine the order of protein gains/losses and infer protein behavior.

Main Results:

• Clobetasol treatment caused permanent loss of E-cadherin and gain of vimentin in A431 cells.
• Cells maintained cytokeratin 8/18 expression alongside vimentin.
• 3D Raman imaging visualized unique cytoplasmic features in A431D cells, combining parent and vimentin-expressing cell characteristics.

Conclusions:

• Clobetasol can induce EMT in vulvar cancer cells, with implications for treatment.
• 3D SERS imaging effectively visualizes protein dynamics during EMT.
• Raman imaging offers a novel method for identifying cells with mixed intermediate filament types and those undergoing EMT.