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Epigenetic alteration of the SOCS1 gene in hepatocellular carcinoma

Pei-Yi Chu1, Chung-Min Yeh, Nicholas C Hsu

  • 1Department of Surgical Pathology, Changhua Christian Hospital, Taiwan.

Swiss Medical Weekly
|July 22, 2010
PubMed
Abstract

Insights

The suppressor of cytokine signalling 1 (SOCS1) gene is down-regulated in hepatocellular carcinoma (HCC). Promoter hypermethylation of SOCS1 correlates with HCC development, suggesting a tumor suppressor role in liver cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Hepatology

Background:

  • Suppressor of cytokine signalling (SOCS) proteins are implicated in inhibiting signaling pathways.
  • SOCS proteins may play a role in decelerating or inhibiting cirrhosis and hepatocellular carcinoma (HCC) progression.
  • The specific role of SOCS1 in HCC requires further investigation.

Purpose of the Study:

  • To investigate the expression of the SOCS1 gene in HCC.
  • To explore the potential molecular mechanisms underlying SOCS1 regulation in HCC.
  • To determine the association between SOCS1 expression and HCC development.

Main Methods:

  • Investigated CpG island methylation status at the SOCS1 promoter region.
  • Analyzed SOCS1 gene expression using immunohistochemistry and qRT-PCR.
  • Examined 46 HCC tumor and paired non-tumor liver tissue samples.

Main Results:

  • SOCS1 protein expression was significantly decreased in HCC tissues compared to non-tumor tissues.
  • SOCS1 mRNA levels were down-regulated in HCC tumor cells.
  • SOCS1 promoter hypermethylation was observed in 39% of HCC samples and correlated with liver cirrhosis and tumor size.

Conclusions:

  • SOCS1 exhibits a tumor suppressor-like role in human hepatocarcinogenesis.
  • Down-regulation and promoter hypermethylation of SOCS1 are implicated in HCC development.
  • SOCS1 may serve as a potential therapeutic target for HCC.

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