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Updated: Jun 6, 2026
Proteomic Sample Preparation from Formalin Fixed and Paraffin Embedded Tissue
Published on: September 2, 2013
A well-based reverse-phase protein array applicable to extracts from formalin-fixed paraffin-embedded tissue
Joon-Yong Chung1, Seo-Jin Lee, Ylaya Kris
1Tissue Array Research Program, Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
Insights
We developed a novel protein extraction method for formalin-fixed paraffin-embedded (FFPE) tissues, enhancing proteomic analysis. This technique improves protein recovery and preserves immunoreactivity for biomarker discovery in clinical studies.
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- Formalin-fixed paraffin-embedded (FFPE) tissue proteomic analysis is valuable for diagnostics but challenging due to protein crosslinking.
- Existing methods often compromise protein integrity and yield.
Purpose of the Study:
- To develop a reliable protein extraction method for FFPE tissues to overcome fixation-induced challenges.
- To establish a protein-profiling platform for molecular analysis of FFPE samples.
Main Methods:
- A heat-induced antigen retrieval method using a pressure cooker was employed for protein extraction from FFPE tissues.
- A well-based reversed-phase (RP) protein array platform with electrochemiluminescence detection was developed.
- Laser capture microdissection was used to obtain FFPE protein samples for array analysis.
Main Results:
- The novel extraction method achieved approximately 90% protein yield compared to frozen tissue.
- Western blotting confirmed preservation of immunoreactivity and recovery of full-length proteins.
- The RP protein array platform detected measurable signal differences from minimal FFPE samples (500 shots), with lysates stable for one month at room temperature.
Conclusions:
- The developed protein extraction method and RP protein array platform enable robust molecular profiling of FFPE tissues.
- This approach facilitates biomarker validation and development for clinical studies using archival FFPE samples.
Abstract:
Proteomic analysis of formalin-fixed paraffin-embedded (FFPE) tissue offers significant diagnostic utility but is complicated due to the high level of covalently crosslinked proteins arising from formalin fixation. To address these challenges, we developed a reliable protein extraction method for FFPE tissue, based on heat-induced antigen retrieval within a pressure cooker. The protein extraction yield from archival FFPE tissue section is approximately 90% of that recovered from frozen tissue. This method demonstrates preservation of immunoreactivity and recovery of full-length proteins by Western blotting. Additionally, we developed a well-based RP protein array platform utilizing an electrochemiluminescence detection system. Protein samples derived from FFPE tissue by means of laser capture dissection, with as few as 500 shots demonstrate measurable signal differences for different proteins. The lysates coated to the array plate, remain stable over 1 month at room temperature. Theses data suggest that this new protein-profiling platform coupled with the protein extraction method can be used for molecular profiling analysis in FFPE tissue, and contribute to the validation and development of biomarkers in clinical studies.
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