Proteomic profiling of the epithelial-mesenchymal transition using 2D DIGE

Area of Science:

• Cancer Biology
• Proteomics
• Cellular Signaling

Background:

• Metastasis is the leading cause of cancer mortality, driven by complex molecular mechanisms.
• Epithelial-mesenchymal transition (EMT) is a critical early step in the metastatic cascade, conferring invasive properties to cancer cells.
• Understanding the extracellular factors influencing EMT is crucial for deciphering cancer progression.

Purpose of the Study:

• To analyze the secretome of Madin-Darby Canine Kidney (MDCK) cells during oncogenic Ras, and Ras/Transforming Growth Factor-beta (TGF-β)-mediated epithelial-mesenchymal transition (EMT).
• To identify differentially expressed proteins in the extracellular environment during EMT.
• To gain insights into the extracellular components that modulate the EMT process.

Main Methods:

• Optimization of serum-free cell culture conditions for MDCK cells.
• Establishment of a secretome purification methodology.
• Differential Gel Electrophoresis (DIGE) analysis of secretome samples to quantify protein expression changes during EMT.

Main Results:

• Successful identification of several proteins that are differentially expressed during EMT.
• Quantification of protein expression changes provides insights into the extracellular matrix remodeling during EMT.
• The proteomic strategy effectively revealed key EMT modulators in the cell secretome.

Conclusions:

• The study successfully characterized the secretome changes associated with EMT.
• Identified EMT modulators contribute to a broader understanding of the extracellular aspects of cancer metastasis.
• This research provides a foundation for further investigation into the role of secretome in cancer progression and therapeutic strategies.