Expression and clinical role of protein of regenerating liver (PRL) phosphatases in ovarian carcinoma.

Abstract

The present study analyzed the expression and clinical role of the protein of regenerating liver (PRL) phosphatase family in ovarian carcinoma. PRL1-3 mRNA expression was studied in 184 tumors (100 effusions, 57 primary carcinomas, 27 solid metastases) using RT-PCR. PRL-3 protein expression was analyzed in 157 tumors by Western blotting. PRL-1 mRNA levels were significantly higher in effusions compared to solid tumors (p < 0.001), and both PRL-1 and PRL-2 were overexpressed in pleural compared to peritoneal effusions (p = 0.001). PRL-3 protein expression was significantly higher in primary diagnosis pre-chemotherapy compared to post-chemotherapy disease recurrence effusions (p = 0.003). PRL-1 mRNA expression in effusions correlated with longer overall survival (p = 0.032), and higher levels of both PRL-1 and PRL-2 mRNA correlated with longer overall survival for patients with pre-chemotherapy effusions (p = 0.022 and p = 0.02, respectively). Analysis of the effect of laminin on PRL-3 expression in ovarian carcinoma cells in vitro showed dose-dependent PRL-3 expression in response to exogenous laminin, mediated by Phospholipase D. In contrast to previous studies associating PRL-3 with poor outcome, our data show that PRL-3 expression has no clinical role in ovarian carcinoma, whereas PRL-1 and PRL-2 expression is associated with longer survival, suggesting that PRL phosphatases may be markers of improved outcome in this cancer.

• Authors: Reuven Reich, Shany Hadar, Ben Davidson
• Journal: International journal of molecular sciences (Int J Mol Sci) Vol. 12 Issue 2 Pg. 1133-45 (Feb 11 2011) ISSN: 1422-0067 [Electronic] Switzerland
• PMID: 21541048 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Biomarkers, Tumor
• Cell Cycle Proteins
• Membrane Proteins
• Neoplasm Proteins
• PTP4A1 protein, human
• PTP4A2 protein, human
• PTP4A3 protein, human
• Protein Tyrosine Phosphatases

Topics

• Adult
• Aged
• Biomarkers, Tumor (genetics, metabolism)
• Carcinoma (diagnosis, genetics, metabolism)
• Cell Cycle Proteins (genetics, metabolism)
• Cell Line, Tumor
• Female
• Humans
• Membrane Proteins (genetics, metabolism)
• Middle Aged
• Neoplasm Proteins (genetics, metabolism)
• Ovarian Neoplasms (diagnosis, genetics, metabolism)
• Prognosis
• Protein Tyrosine Phosphatases (genetics, metabolism)