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Published in: Clinical & Experimental Metastasis 8/2013

01-12-2013 | Research Paper

Decreased expression and aberrant methylation of Gadd45G is associated with tumor progression and poor prognosis in esophageal squamous cell carcinoma

Authors: Wei Guo, Tienian Zhu, Zhiming Dong, Lei Cui, Minghui Zhang, Gang Kuang

Published in: Clinical & Experimental Metastasis | Issue 8/2013

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Abstract

The growth arrest DNA damage-inducible gene (Gadd45) family, which is composed of Gadd45A, Gadd45B, and Gadd45G, is involved in DNA damage response and cell growth arrest. The present study was to detect the role of Gadd45 gene family in esophageal cancer and the relationship of Gadd45G methylation to a series of pathological parameters in a large esophageal squamous cell carcinoma (ESCC) sample, in order to elucidate more information on the role of Gadd45 gene family with regard to the pathogenesis of ESCC. Frequent silencing of Gadd45G but not Gadd45A and Gadd45B were found in esophageal cancer cell lines and the silencing of Gadd45G may be reversed by 5-Aza-dC or TSA treatment in Eca109 cell line. The aberrant proximal promoter methylation of Gadd45G induces silencing of Gadd45G expression in Eca109 cell line. Gadd45A mRNA and protein expression in ESCC tumor tissues was significantly different compared to corresponding normal tissues. Decreased mRNA and protein expression of Gadd45G was observed in ESCC tumor tissues and was associated with Gadd45G proximal promoter methylation. Gadd45A or Gadd45B expression was not correlated with ESCC patients survival, while Gadd45G methylation status and protein expression were independently associated with ESCC patients’ survival. These data indicated that Gadd45G may be a functional tumor suppressor and its inactivation through proximal promoter methylation may play an important role in ESCC carcinogenesis and reactivation of Gadd45G gene may has therapeutic potential and may be used as a prognostic marker for ESCC patients.
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Metadata
Title
Decreased expression and aberrant methylation of Gadd45G is associated with tumor progression and poor prognosis in esophageal squamous cell carcinoma
Authors
Wei Guo
Tienian Zhu
Zhiming Dong
Lei Cui
Minghui Zhang
Gang Kuang
Publication date
01-12-2013
Publisher
Springer Netherlands
Published in
Clinical & Experimental Metastasis / Issue 8/2013
Print ISSN: 0262-0898
Electronic ISSN: 1573-7276
DOI
https://doi.org/10.1007/s10585-013-9597-2

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