Abstract
Colorectal cancer is one of the most common malignancies in developed countries. Scarce clinical signs at the early stages of the disease and the lack of fast and sensitive diagnostic techniques based on the detection of tumor specific protein markers contribute greatly to the high mortality rate. The search for such markers is significantly complicated by the high levels of major structural and cytoskeletal proteins in normal and tumor tissues. Extraction with 0.2 M NaCl in the presence of the nonionic detergent NP-40 was performed to enrich the soluble protein fraction. This modification resulted in a considerably increased sensitivity of detection of minor proteins that may enter the circulation during carcinogenesis. The soluble protein profiles of the paired colon adenocarcinoma and normal tissue specimens were compared using 2D gel electrophoresis, which enabled the detection of 10 proteins whose levels in tumors were elevated at least 10-fold as compared to normal tissue. The proteins were identified by MALDI-TOF mass spectrometry, and two new protein markers of colon cancer, TAF9 and CISH, were discovered. Low levels of CISH synthesis in most normal human tissues and tumors other than colorectal cancer make it a prospective candidate diagnostic marker for this type of cancer.
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Original Russian Text © G.S. Krasnov, S.L. Khankin, Yu.A. Bukurova, O.G. Zatsepina, N.Yu. Oparina, D.G. Garbuz, A. N. Ershov, T.D. Mashkova, V.L. Karpov, S.F. Beresten, 2009, published in Molekulyarnaya Biologiya, 2009, Vol. 43, No. 4, pp. 610–615.
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Krasnov, G.S., Khankin, S.L., Bukurova, Y.A. et al. Proteomic expression analysis of human colorectal cancer: Identification of soluble overexpressed proteins. Mol Biol 43, 562–566 (2009). https://doi.org/10.1134/S0026893309040050
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DOI: https://doi.org/10.1134/S0026893309040050