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Matas-Nadal, Clara; Bech-Serra, Joan Josep; Guasch-Vallés, Marta; Fernández-Armenteros, Josep Manel; Barceló, Carla; Casanova, Josep Manel; de la Torre Gómez, Carolina; Aguayo Ortiz, Rafael; Garí, Eloi
Journal of proteome research, 07/2020, Letnik: 19, Številka: 7Journal Article
The analysis of tumor interstitial fluid (TIF) composition is a valuable procedure to identify antimetastatic targets, and different laboratories have set up techniques for TIF isolation and proteomic analyses. However, those methods had never been compared in samples from the same tumor and patient. In this work, we compared the two most used methods, elution and centrifugation, in pieces of the same biopsy samples of cutaneous squamous cell carcinoma (cSCC). First, we established that high G-force (10 000g) was required to obtain TIF from cSCC by centrifugation. Second, we compared the centrifugation method with the elution method in pieces of three different cSCC tumors. We found that the mean protein intensities based in the number of peptide spectrum matches was significantly higher in the centrifuged samples than in the eluted samples. Regarding the robustness of the methods, we observed higher overlapping between both methods (77–80%) than among samples (50%). These results suggest that there exists an elevated consistence of TIF composition independently of the method used. However, we observed a 3-fold increase of extracellular proteins in nonoverlapped proteome obtained by centrifugation. We therefore conclude that centrifugation is the method of choice to study the proteome of TIF from cutaneous biopsies.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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