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DIGE Saturation Labeling for Scarce Amounts of Protein from Formalin-Fixed Paraffin-Embedded (FFPE) Tissue
1Department of Biology, Maynooth University, National University of Ireland, Maynooth, Co. Kildare, Ireland. paul.dowling@mu.ie.
Insights
Fluorescence two-dimensional difference gel electrophoresis (2D-DIGE) enables global protein detection in formalin-fixed paraffin-embedded (FFPE) tissues. This method is valuable for discovering cancer biomarkers even with limited protein samples.
Area of Science:
- Proteomics
- Biomarker Discovery
- Cancer Research
Background:
- Formalin-fixed paraffin-embedded (FFPE) tissues are a stable, readily available resource for retrospective clinical studies.
- Standard pathology practices yield FFPE tissues, ideal for long-term storage and analysis.
- Limited protein yield from precious tissue biopsies poses a challenge for proteomics.
Purpose of the Study:
- To describe the utility of 2D-DIGE as a proteomics platform for FFPE tissues.
- To highlight the application of 2D-DIGE in biomarker discovery for cancer development and progression.
- To demonstrate the effectiveness of 2D-DIGE for analyzing scarce protein amounts.
Main Methods:
- Utilizing fluorescence two-dimensional difference gel electrophoresis (2D-DIGE).
- Applying 2D-DIGE for global protein detection in FFPE tissues.
- Adapting saturation 2D-DIGE technology for low-level protein labeling.
Main Results:
- 2D-DIGE successfully detects expressed proteins in FFPE tissues.
- The method is effective for identifying potential cancer biomarkers.
- Saturation 2D-DIGE allows analysis of limited protein quantities from FFPE samples.
Conclusions:
- 2D-DIGE is a powerful proteomics tool for FFPE tissue analysis.
- This technique facilitates biomarker discovery in cancer research.
- 2D-DIGE overcomes protein quantity limitations in precious tissue samples.
Abstract:
In this chapter, we describe the utility of fluorescence two-dimensional difference gel electrophoresis (2D-DIGE) as a proteomics platform for the global detection of expressed proteins in formalin-fixed paraffin-embedded (FFPE) tissues and its use for biomarker discovery/identification of proteins that may contribute to cancer development and progression. Formalin fixation and paraffin embedding of tissue is the standard processing methodology practiced in pathology laboratories worldwide, resulting in a highly stable form of tissue that is easily stored due to its inherent stability at room temperature. Consequently, FFPE tissues represent an attractive reservoir of clinical material for conducting retrospective protein biomarker analysis. A limitation for proteomics research in this type of clinical sample is the amount of viable protein that can be obtained from fixed tissues. Tissue biopsies are precious samples that can generally be acquired in very small amounts due to the invasive nature of the sample collection, mainly during surgery or biopsy. Subsequently, the amount of extracted protein can be, in many cases, very limited. The saturation 2D-DIGE technology has emerged as a useful method for protein analysis where only scarce amounts of protein are available. This approach can be adapted successfully to label low-level protein isolated from FFPE tissue.
