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Oncogenic function and prognostic significance of protein tyrosine phosphatase PRL-1 in hepatocellular carcinoma

Shaowen Jin1, Kaimei Wang, Kang Xu

  • 1Department of Hepatobiliary Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China; Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Medical Research Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.

Oncotarget
|July 9, 2014
PubMed

Insights

Elevated PRL-1 protein expression is common in hepatocellular carcinoma (HCC), promoting cancer cell invasion and metastasis. This suggests PRL-1 is a potential prognostic marker and therapeutic target for HCC patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Limited understanding of the biological functions and signaling pathways of PRL-1 in hepatocellular carcinoma (HCC).
  • Previous SNP-Chip data indicated PRL-1 copy number amplification in a subset of HCC patients.

Purpose of the Study:

  • To investigate the oncogenic function and prognostic significance of PRL-1 in HCC.
  • To elucidate the underlying molecular mechanisms of PRL-1's role in HCC progression.

Main Methods:

  • Immunohistochemistry (IHC) to assess PRL-1 protein levels in 167 HCC samples and metastatic thrombi.
  • Correlation, Kaplan-Meier, and Cox regression analyses to evaluate the association between PRL-1 expression and clinicopathological features.
  • In vitro cell models (overexpression and knockdown) to study PRL-1's functional impact on HCC cell migration and invasion.
  • Investigation of signaling pathways, including PI3K/AKT/GSK3β, and E-cadherin expression.

Main Results:

  • PRL-1 was frequently elevated in HCC tissues (81%) and associated with aggressive phenotypes and poorer prognosis.
  • Overexpression of PRL-1 significantly enhanced HCC cell migration and invasion.
  • PRL-1's oncogenic functions were mediated by the PI3K/AKT/GSK3β pathway via inhibition of E-cadherin.
  • PRL-1 levels were higher in metastatic cancer thrombi compared to primary HCC tissues.

Conclusions:

  • PRL-1 exhibits significant oncogenic functions in HCC, particularly in invasion and metastasis.
  • Elevated PRL-1 expression serves as a potential prognostic marker for HCC.
  • PRL-1 represents a promising therapeutic target for HCC treatment.

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