Underexpression of deleted in liver cancer 2 (DLC2) is associated with overexpression of RhoA and poor prognosis in hepatocellular carcinoma.
BACKGROUND
DLC2, a unique RhoGAP, has been recently identified as a tumor suppressor gene in hepatocellular carcinoma (HCC). However, the expression of DLC2 protein, and its relationship with RhoA in clinical hepatocellular carcinoma have not been studied. The aim of this study was to investigate the DLC2 protein expression and its correlation with expression of RhoA, as well as to evaluate the prognostic value of DLC2 for HCC patients.


METHODS
Western blot and immunohistochemical staining were employed to detect DLC2 protein expression in 128 HCC specimens. The correlation between DLC2 protein expression and clinicopathologic outcome, and prognostic value of DLC2 for HCC patients were analyzed.


RESULTS
HCC tissues revealed significantly lower level of DLC2 protein than pericarcinomatous liver tissues (PCLT). There was significant correlation between underexpression of DLC2 protein and cell differentiation. Meanwhile, underexpression of DLC2 protein was correlated with overexression of RhoA. Furthermore, HCC Patients with DLC2-negative expression showed a significantly poorer prognosis than those with DLC2-positve expression.


CONCLUSIONS
Our data strongly suggested that decreased DLC2 expression in HCC correlates with cell differentiation of HCC and overexpression of RhoA, underexpression of DLC2 is associated with poor prognosis in HCC patients.
Xiaorong
Li
L
Department of General Surgery, The Third Affiliated Hospital of Central South University, Central South University, Tongzhipo Road, Changsha, Hunan Province, 410013, PR China. lixiaorong_x@hotmail.com
Wei
Wu
W
Liyuan
Qian
Q
Kaiyan
Yang
Y
D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor; D015153:Blotting, Western; D006528:Carcinoma, Hepatocellular / Q000175:diagnosis / Q000473:pathology* / Q000503:physiopathology; D005260:Female; D020690:GTPase-Activating Proteins; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008099:Liver / Q000378:metabolism / Q000473:pathology*; D008113:Liver Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009367:Neoplasm Staging; D011379:Prognosis; D025521:Tumor Suppressor Proteins / Q000096:biosynthesis / Q000378:metabolism*; D020742:rhoA GTP-Binding Protein / Q000096:biosynthesis / Q000378:metabolism*
D014408:Biomarkers, Tumor; D020690:GTPase-Activating Proteins; C473607:STARD13 protein, human; D025521:Tumor Suppressor Proteins; D020742:rhoA GTP-Binding Protein