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Article

Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma

  • Authors:
    • Jing Liu
    • Yaming Wang
    • Xuefei Sun
    • Nan Ji
    • Shengjun Sun
    • Yajie Wang
    • Fusheng Liu
    • Qu Cui
    • Chen Wang
    • Yuanbo Liu
  • View Affiliations / Copyright

    Affiliations: Department of Hematology, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China, Department of Neurosurgery, Navy General Hospital, Beijing 100050, P.R. China, Department of Neurosurgery, Institute of Neurological Sciences, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China, Neuroimaging Center, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China, Core Laboratory for Clinical Medical Research, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China, Institute of Neurological Sciences, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China, Department of Internal Medicine, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China
  • Pages: 887-894
    |
    Published online on: December 8, 2016
       https://doi.org/10.3892/or.2016.5308
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Abstract

The Src homology region 2 domain-containing phosphatase-1 (SHP1) is a critical negative regulator involved in the JAK/STAT signaling pathway. The SHP1 gene has been proposed as a candidate tumor suppressor in solid and hematological malignancies and promoter methylation is an important biological process in controlling tumorigenesis. However, the detailed roles of SHP1 promoter methylation in the pathogenesis of primary central nervous system lymphoma (PCNSL) is largely unknown. In the present study, we evaluated the correlation between SHP1 expression and promoter methylation in patients with PCNSL. Thirty-three patients with PCNSL were included. We evaluated SHP1 protein expression levels by immunohistochemistry and the SHP1 promoter methylation profile by pyrosequencing analysis. For cases (n=8) with a good yield of total protein, SHP1 phosphorylation (pSHP1) and STAT3 protein expression levels were further analyzed by western blot analysis to uncover the molecular impact of SHP1 promoter methylation on downstream signaling pathways. In this study, a lower expression of SHP1 protein level was observed in 16/33 cases (48.5%) of PCNSL. SHP1 promoter methylation was predominant in 29/33 cases (87.9%) with a mean methylation level of 31.7±36.5%. The mean methylation level of the SHP1 promoter was significantly elevated in patients with a lower SHP1 protein expression, compared with those showing a higher SHP1 protein expression (50.3±38.9 vs. 14.2±24.0%, p=0.004). Further analysis showed that SHP1 protein expression was significantly decreased in patients with a higher SHP1 promoter methylation status (p=0.001), and such attenuation was correlated with a downregulation of pSHP1 (p=0.005) and an upregulation of STAT3 protein expression (p=0.020). Our data demonstrated that epigenetic alterations in the promoter region downregulated SHP1 expression in PCNSL patients. SHP1 promoter methylation was correlated with tyrosine phosphorylation and activation of transcription factor STAT3, which may contribute to the pathogenesis of PCNSL. Therapeutical regimens with epigenetic modifiers may be a potential option for patients with PCNSL.
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Copy and paste a formatted citation
Spandidos Publications style
Liu J, Wang Y, Sun X, Ji N, Sun S, Wang Y, Liu F, Cui Q, Wang C, Liu Y, Liu Y, et al: Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma. Oncol Rep 37: 887-894, 2017.
APA
Liu, J., Wang, Y., Sun, X., Ji, N., Sun, S., Wang, Y. ... Liu, Y. (2017). Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma. Oncology Reports, 37, 887-894. https://doi.org/10.3892/or.2016.5308
MLA
Liu, J., Wang, Y., Sun, X., Ji, N., Sun, S., Wang, Y., Liu, F., Cui, Q., Wang, C., Liu, Y."Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma". Oncology Reports 37.2 (2017): 887-894.
Chicago
Liu, J., Wang, Y., Sun, X., Ji, N., Sun, S., Wang, Y., Liu, F., Cui, Q., Wang, C., Liu, Y."Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma". Oncology Reports 37, no. 2 (2017): 887-894. https://doi.org/10.3892/or.2016.5308
Copy and paste a formatted citation
x
Spandidos Publications style
Liu J, Wang Y, Sun X, Ji N, Sun S, Wang Y, Liu F, Cui Q, Wang C, Liu Y, Liu Y, et al: Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma. Oncol Rep 37: 887-894, 2017.
APA
Liu, J., Wang, Y., Sun, X., Ji, N., Sun, S., Wang, Y. ... Liu, Y. (2017). Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma. Oncology Reports, 37, 887-894. https://doi.org/10.3892/or.2016.5308
MLA
Liu, J., Wang, Y., Sun, X., Ji, N., Sun, S., Wang, Y., Liu, F., Cui, Q., Wang, C., Liu, Y."Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma". Oncology Reports 37.2 (2017): 887-894.
Chicago
Liu, J., Wang, Y., Sun, X., Ji, N., Sun, S., Wang, Y., Liu, F., Cui, Q., Wang, C., Liu, Y."Promoter methylation attenuates SHP1 expression and function in patients with primary central nervous system lymphoma". Oncology Reports 37, no. 2 (2017): 887-894. https://doi.org/10.3892/or.2016.5308
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