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Updated: May 9, 2026

The Use of Reverse Phase Protein Arrays (RPPA) to Explore Protein Expression Variation within Individual Renal Cell Cancers
Published on: January 22, 2013
Characterization of signalling pathways by reverse phase protein arrays
Katharina Malinowsky1, Claudia Wolff, Christina Schott
1Department of Pathology, Technische Universität München, Munich, Germany.
This study presents a new method for extracting proteins from formalin-fixed, paraffin-embedded (FFPE) tissues for reverse phase protein array (RPPA) analysis. This technique helps understand ovarian cancer by analyzing epidermal growth factor receptor (EGFR) signaling and epithelial-mesenchymal transition (EMT) proteins.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Formalin-fixed, paraffin-embedded (FFPE) tissues are crucial for cancer research but pose challenges for protein analysis.
- Reverse phase protein array (RPPA) is effective for analyzing numerous proteins in limited biological samples like tumor biopsies.
Purpose of the Study:
- To develop and validate a protocol for quantitative protein extraction from FFPE tissues for RPPA.
- To investigate the role of epidermal growth factor receptor (EGFR) signaling and epithelial-mesenchymal transition (EMT) in ovarian cancer.
Main Methods:
- Developed a novel protocol for quantitative protein extraction from FFPE tissues.
- Utilized RPPA to analyze the expression of 25 proteins involved in EGFR signaling and EMT.
- Examined 23 primary ovarian tumors and their corresponding metastases.
Main Results:
- Established a reliable method for protein extraction from FFPE tissues for RPPA.
- Identified significant correlations between Snail, EGFR((Tyr1086)), and p38 MAPK((Thr180/Tyr182)) in ovarian cancer.
- Found that high Snail in primary tumors and high pp38 MAPK((Thr180/Tyr182)) in metastases correlate with increased mortality risk.
Conclusions:
- The developed protocol enables quantitative protein analysis from FFPE tissues using RPPA.
- EGFR signaling and EMT markers, particularly Snail and p38 MAPK, are implicated in ovarian cancer progression and patient survival.
- This research provides insights into potential biomarkers for predicting prognosis in ovarian cancer.
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