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The Influence of Methylated Septin 9 Gene on RNA and Protein Level in Colorectal Cancer

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Pathology & Oncology Research

Abstract

Colorectal cancer is one of the leading death causes in the world. Specificity and sensitivity of the present screening methods are unsuitable and their compliance is too low. Nowadays the most effective method is the colonoscopy, because it gives not only macroscopic diagnosis but therapeutic possibility as well, however the compliance of the patients is very low. Hence development of new diagnostic methods is needed. Altered expression of septin 9 was found in several tumor types including colorectal cancer. The aim of this study was to detect the methylation related mRNA and protein expression changes of septin 9 in colorectal adenoma-dysplasia-carcinoma sequence and to analyze its reversibility by demethylation treatment. Septin 9 protein expression showed significant difference between normal and colorectal cancer (CRC) samples (p < 0,001). According to biopsy microarray results, septin 9 mRNA expression decreased in the progression of colon neoplastic disease (p < 0,001). In laser microdissected epithelial cells, septin 9 significantly underexpressed in CRC compared to healthy controls (p < 0,001). The expression of septin9_v1 region was higher in the healthy samples, while septin9_v2, v4, v4*, v5 overexpression were detected in cancer epithelial cells compared to normal. The septin 9 mRNA and protein levels of HT29 cells increased after demethylation treatment. The increasing methylation of septin 9 gene during colorectal adenoma-dysplasia-carcinoma sequence progression is reflected in the decreasing mRNA and protein expression, especially in the epithelium. These changes can be reversed by demethylation agents converting this screening marker gene into therapeutic target.

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Authors and Affiliations

  1. Semmelweis University, 2nd Department of Internal Medicine, Cell Analysis Laboratory, Szentkirályi Street 46, 1088, Budapest, Hungary

    Kinga Tóth, Orsolya Galamb, Sándor Spisák, Barnabás Wichmann, Ferenc Sipos, Gábor Valcz, Katalin Leiszter, Béla Molnár & Zsolt Tulassay

  2. Hungarian Academy of Sciences, Molecular Medicine Research Unit, Budapest, Hungary

    Orsolya Galamb, Sándor Spisák, Béla Molnár & Zsolt Tulassay

Authors
  1. Kinga Tóth
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  2. Orsolya Galamb
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  3. Sándor Spisák
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  4. Barnabás Wichmann
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  5. Ferenc Sipos
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  6. Gábor Valcz
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  7. Katalin Leiszter
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  8. Béla Molnár
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  9. Zsolt Tulassay
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Correspondence to Kinga Tóth.

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Tóth, K., Galamb, O., Spisák, S. et al. The Influence of Methylated Septin 9 Gene on RNA and Protein Level in Colorectal Cancer. Pathol. Oncol. Res. 17, 503–509 (2011). https://doi.org/10.1007/s12253-010-9338-7

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  • DOI: https://doi.org/10.1007/s12253-010-9338-7

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