Abstract
Hospital tissue repositories possess a vast and valuable supply of disease samples with matched retrospective clinical information. Detection and characterization of disease biomarkers in formalin-fixed paraffin-embedded (FFPE) tissues will greatly aid the understanding of the diseases mechanisms and help in the development of diagnostic and prognostic markers. In this study, the possibility of using full-length proteins extracted from clinically archived FFPE tissues in two-dimensional (2-D) gel-based proteomics was evaluated. The evaluation was done based on two types of tumor tissues (breast and prostate) and two extraction protocols. The comparison of the 2-D patterns of FFPE extracts obtained by two extraction protocols with the matching frozen tissue extracts showed that only 7–10 % of proteins from frozen tissues can be matched to proteins from FFPE tissues. Most of the spots in the 2-D FFPE’s maps had pl 4–6, while the percentages of proteins with pl above 6 were 3–5 times lower in comparison to the fresh/frozen tissue. Despite the three-fold lower number of the detected spots in FFPE maps compared to matched fresh/frozen maps, 67–78 % of protein spots in FFPE could not be matched to the corresponding spots in the fresh/frozen tissue maps indicating irreversible protein modifications. In conclusion, the inability to completely reverse the cross-linked complexes and overcome protein fragmentation with the present day FFPE extraction methods stands in the way of effective use of these samples in 2-D gel based proteomics studies.
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Abbreviations
- 2-D:
-
Two-dimensional
- 2-D DIGE:
-
Two-dimensional difference in-gel electrophoresis
- 2-D PAGE:
-
Two-dimensional polyacrylamide gel electrophoresis
- AR:
-
Antigen retrieval
- CHAPS:
-
3-[(3-Cholamidopropyl)dimethylammonio]-1-propanesulfonate
- DTT:
-
Dithiothreitol
- FFPE:
-
Formalin-fixed paraffin-embedded
- SDS:
-
Sodium dodecyl sulfate
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- Tris:
-
Tris(hydroxymethyl)aminomethane
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Acknowledgments
Many thanks to Dr. Katerina Kubelka-Sabit and Dr. Vanja Filipovski from Clinical Hospital “Sistina”, Skopje, for providing the fresh and FFPE tissues used in this study.
Ethical standard
The study has been approved by the Ethics Committee of the Macedonian Academy of Sciences and Arts.
Conflict of interest
The authors have declared no conflict of interests.
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Davalieva, K., Kiprijanovska, S. & Polenakovic, M. Assessment of the 2-D Gel-Based Proteomics Application of Clinically Archived Formalin-Fixed Paraffin Embedded Tissues. Protein J 33, 135–142 (2014). https://doi.org/10.1007/s10930-014-9545-2
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DOI: https://doi.org/10.1007/s10930-014-9545-2