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Article

Downregulation of PTPRH (Sap-1) in colorectal tumors

  • Authors:
    • Mateusz Bujko
    • Paulina Kober
    • Małgorzata Statkiewicz
    • Michal Mikula
    • Emilia Grecka
    • Nataliia Rusetska
    • Marcin Ligaj
    • Jerzy Ostrowski
    • Janusz Aleksander Siedlecki
  • View Affiliations / Copyright

    Affiliations: Department of Molecular and Translational Oncology, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland, Department of Genetics, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland, Department of Pathology and Laboratory Diagnostics, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
  • Pages: 841-850
    |
    Published online on: July 5, 2017
       https://doi.org/10.3892/ijo.2017.4068
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Abstract

Tyrosine phosphorylation is one of the basic mechanisms for signal transduction in the cell. Receptors exhibiting tyrosine kinase activity are widely involved in carcinogenesis and are negatively regulated by receptor protein tyrosine phosphatases (RPTP). Genes encoding different RPTPs are affected by aberrant epigenetic regulation in cancer. PTPRH (SAP-1) has been previously described to be overexpressed in colorectal cancer (CRC) and classified as an oncogenic factor. Previous microarray-based mRNA expression comparison of colorectal adenomas (AD), CRC and normal mucosa samples (NM) demonstrated that PTPRH tumor expression is the most reduced of all RPTP genes. qRT-PCR validation revealed gene downregulation for CRC (7.6-fold-change; P<0.0001) and AD (3.4-fold-change; P<0.0001) compared to NM. This was confirmed by immunohistochemical staining of tumor and NM sections as pronounced decrease of protein expression was observed in CRCs compared to the corresponding normal tissue. DNA methylation of two PTPRH promoter fragments was analyzed by pyrosequencing in a group of CRC, and AD patients as well as NM samples and CRC cell lines. The mean DNA methylation levels of these two regions were significantly higher in CRC than in NM. Both regions were highly methylated in SW480 and HCT116 cell lines contrary to unmethylated HT29 and COLO205. Cell lines with highly methylated promoters notably showed lower PTPRH expression levels, lower RNA II polymerase concentrations and higher levels of H3K27 trimethylation in the promoter and gene body, measured by chromatin immunoprecipitation. Cells were cultured with 5-aza-deoxycitidine and an increase in PTPRH expression was observed in SW480 and HCT116, whereas this was unchanged in the unmethylated cell lines. The results indicate that PTPRH is downregulated in colorectal tumors and its expression is epigenetically regulated via DNA methylation and chromatin modifications.
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Copy and paste a formatted citation
Spandidos Publications style
Bujko M, Kober P, Statkiewicz M, Mikula M, Grecka E, Rusetska N, Ligaj M, Ostrowski J and Siedlecki JA: Downregulation of PTPRH (Sap-1) in colorectal tumors. Int J Oncol 51: 841-850, 2017.
APA
Bujko, M., Kober, P., Statkiewicz, M., Mikula, M., Grecka, E., Rusetska, N. ... Siedlecki, J.A. (2017). Downregulation of PTPRH (Sap-1) in colorectal tumors. International Journal of Oncology, 51, 841-850. https://doi.org/10.3892/ijo.2017.4068
MLA
Bujko, M., Kober, P., Statkiewicz, M., Mikula, M., Grecka, E., Rusetska, N., Ligaj, M., Ostrowski, J., Siedlecki, J. A."Downregulation of PTPRH (Sap-1) in colorectal tumors". International Journal of Oncology 51.3 (2017): 841-850.
Chicago
Bujko, M., Kober, P., Statkiewicz, M., Mikula, M., Grecka, E., Rusetska, N., Ligaj, M., Ostrowski, J., Siedlecki, J. A."Downregulation of PTPRH (Sap-1) in colorectal tumors". International Journal of Oncology 51, no. 3 (2017): 841-850. https://doi.org/10.3892/ijo.2017.4068
Copy and paste a formatted citation
x
Spandidos Publications style
Bujko M, Kober P, Statkiewicz M, Mikula M, Grecka E, Rusetska N, Ligaj M, Ostrowski J and Siedlecki JA: Downregulation of PTPRH (Sap-1) in colorectal tumors. Int J Oncol 51: 841-850, 2017.
APA
Bujko, M., Kober, P., Statkiewicz, M., Mikula, M., Grecka, E., Rusetska, N. ... Siedlecki, J.A. (2017). Downregulation of PTPRH (Sap-1) in colorectal tumors. International Journal of Oncology, 51, 841-850. https://doi.org/10.3892/ijo.2017.4068
MLA
Bujko, M., Kober, P., Statkiewicz, M., Mikula, M., Grecka, E., Rusetska, N., Ligaj, M., Ostrowski, J., Siedlecki, J. A."Downregulation of PTPRH (Sap-1) in colorectal tumors". International Journal of Oncology 51.3 (2017): 841-850.
Chicago
Bujko, M., Kober, P., Statkiewicz, M., Mikula, M., Grecka, E., Rusetska, N., Ligaj, M., Ostrowski, J., Siedlecki, J. A."Downregulation of PTPRH (Sap-1) in colorectal tumors". International Journal of Oncology 51, no. 3 (2017): 841-850. https://doi.org/10.3892/ijo.2017.4068
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