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Over-Expression of Small Ubiquitin-Related Modifier-1 and Sumoylated p53 in Colon Cancer

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Abstract

Here we investigated whether the cellular accumulation of p53 protein caused by over-expression of small ubiquitin-related modifier-1 (SUMO-1) could be used as a predictive marker for prognosis in colon cancer. We detected SUMO-1 and p53 protein levels in 46 cases of colon cancer and adjacent tissues by immunohistochemistry and found that SUMO-1 was expressed at much higher levels in colon cancer compared with that in normal colon tissue. Immunoprecipitation and Western blot analysis revealed that the tumor suppressor p53 was present predominantly in the sumoylated rather than the non-sumoylated form in the colon cancer cell lines. A small interfering RNA targeted to SUMO-1 mRNA sequences was used to observe the levels of the p53 protein. Patients who showed high dual expressions of SUMO-1 and p53 tended to experience metastasis more frequently. These results suggest that the cellular accumulation of p53 protein caused by over-expression of SUMO-1 may be involved in tumor aggressiveness. Multivariate analysis confirmed that the high dual expression of SUMO-1 and p53 was an independent factor for evaluating prognosis. SUMO-1 may be useful as a novel target for therapy in colon cancer as well as a clinical indicator for tumor aggressiveness.

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Acknowledgments

This work was supported by grant support for Scientific Research from Jiangsu Province, China (BK2006243), and by a grant from the National Science Foundation, China (C30771039).

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Authors and Affiliations

  1. Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, Jiangsu, China

    Hongjie Zhang, Xiaoyi Kuai, Zeyu Ji, Zhengyang Li & Ruihua Shi

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  1. Hongjie Zhang
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  2. Xiaoyi Kuai
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  3. Zeyu Ji
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  5. Ruihua Shi
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Correspondence to Ruihua Shi.

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Zhang, H., Kuai, X., Ji, Z. et al. Over-Expression of Small Ubiquitin-Related Modifier-1 and Sumoylated p53 in Colon Cancer. Cell Biochem Biophys 67, 1081–1087 (2013). https://doi.org/10.1007/s12013-013-9612-x

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