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Expression of NEDD9 in Hepatocellular Carcinoma and Its Clinical Significance

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Expression of NEDD9 in Hepatocellular Carcinoma and Its Clinical Significance ONCOLOGY REPORTS 33: 2375-2383, 2015 Expression of NEDD9 in hepatocellular carcinoma and its clinical significance PENG LU1,2*, ZHI-PENG WANG3*, ZHENG DANG4*, ZHI-GANG ZHENG1*, XIAO LI1, LIANG ZHOU5, RUI DING1, SHU-QIANG YUE1 and KE-FENG DOU1 1Department of Hepatobiliary and Pancreaticosplenic Surgery, Xijing Hospital, The Fourth Military Medical University; 2Department of General Surgery, The 518 Central Hospital of PLA; 3Department of Pharmacology, School of Pharmacy, The Fourth Military Medical University, Xi'an, Shanxi; 4Department of Hepatobiliary Surgery, Lanzhou General Hospital of PLA, Lanzhou, Gansu; 5Department of General Surgery, The 155 Central Hospital of PLA, Kaifeng, He'nan, P.R. China Received December 1, 2014; Accepted January 22, 2015 DOI: 10.3892/or.2015.3863 Abstract. Neural precursor cell expressed, developmentally metastasis, intrahepatic venous invasion and high UICC TNM downregulated 9 (NEDD9) plays an integral role in natural and stages in HCC patients. Patients with high NEDD9 expression pathological cell biology. Overexpression of NEDD9 protein levels exhibited poorer recurrence-free and overall survival has been correlated with poor prognosis in various types of than those with a low NEDD9 expression. Additionally, cancer. However, few available data address the precise func- NEDD9 expression status was an independent prognostic tion of the NEDD9 gene in hepatocellular carcinoma (HCC). factor for survival. This correlation remained significant in In the present study, we investigated NEDD9 expression patients with early-stage HCC or with normal serum AFP in 40 primary human HCC tissues compared with matched levels. The results of this study suggest that NEDD9 may be a adjacent non-tumor hepatic tissues using RT-qPCR and valuable prognostic biomarker for HCC, including early-stage western blot analysis. Immunohistochemistry was performed and AFP-normal patients. to analyze the correlations between NEDD9 expression and clinicopathological factors. Statistical analyses were applied Introduction to derive prognostic values of NEDD9 in HCC. The results showed that the NEDD9 mRNA and protein expression levels Hepatocellular carcinoma (HCC) is the fifth most common in HCC tissues were significantly higher than those in matched malignant tumor due to increases in the rates of viral hepatitis adjacent non-tumor hepatic tissues. High NEDD9 expression and adiposis hepatica. HCC is also the third leading cause was correlated with larger tumor size, advanced tumor grade, of cancer mortality worldwide (1,2). Each year, ~650,000 HCC cases are reported globally, and according to statistics, China alone accounts for 55% of HCC cases worldwide (3,4). Hepatic resection is the gold standard therapy for HCC (5). Although the survival of patients with HCC has been greatly Correspondence to: Professors Ke-Feng Dou or Shu-Qiang Yue, improved owing to advances in surgical improvements and Department of Hepatobiliary and Pancreaticosplenic Surgery, Xijing Hospital, The Fourth Military Medical University, No. 169 West perioperative management, long-term survival after surgical Changle Road, Xi'an, Shanxi 710032, P.R. China resection remains low due to the high rates of recurrence and E-mail: [email protected] metastasis (6,7). The recurrence and metastasis of HCC are E-mail: [email protected] multistep processes that involve complex biological and patho- logical events (8,9). Several molecular pathways and abnormal *Contributed equally genetic changes are involved (10). In daily clinical practice, the prediction of prognosis plays Abbreviations: HCC, hepatocellular carcinoma; NEDD9, neural an important role in the assessment of HCC patients and in precursor cell expressed, developmentally downregulated 9; AFP, identifying the optimal therapeutic options. To estimate malig- α-fetoprotein; Cas-L, Crk-associated substrate lymphocyte type; HEF1, nant biological behavior or patient prognosis, sensitive tumor human enhancer of filamentation-1; ANHT, adjacent non-tumor markers are necessary. As a classical and specific marker for hepatic tissues; RT-qPCR, reverse-transcription quantitative poly- merase chain reaction; GAPDH, glyceraldehyde-3-phosphate HCC, α-fetoprotein (AFP) has been widely used for the diag- dehydrogenase; RR, relative risk; 95% CI, 95% confidence interval nosis and evaluation of tumor aggressiveness and to determine the prognosis of HCC (11). When a cut-off value of 20 ng/ml is Key words: NEDD9, hepatocellular carcinoma, clinicopathological used, AFP has a sensitivity and specificity for detecting HCC in factors, survival, prognosis the ranges of 41-65 and 80-90%, respectively (12). However, up to 50% of patients with HCC have AFP levels <20 ng/ml (13), thus AFP cannot be used as a unique target to screen for HCC 2376 LU et al: NEDD9 in Hepatocellular Carcinoma and Clinical Significance recurrence and to predict patient prognosis. Therefore, it is RNA extraction, reverse transcription and quantitative PCR. important to identify useful prognostic biomarkers to predict Total RNA was extracted from fresh tissues using TRIzol the risk of this devastating disease and to identify effective reagent (Invitrogen, Carlsbad, CA, USA), according to the therapeutic target molecules that are strongly associated with manufacturer's instructions. cDNA was synthesized from 2 µg a poor prognosis in HCC. of RNA using an iScript™ cDNA Synthesis kit (Bio-Rad, Neural precursor cell expressed, developmentally down- Hercules, CA, USA). Quantitative PCR (qPCR) was performed regulated 9 (NEDD9), also known as Crk-associated substrate using a MyiQ2 Two-Color Real-Time PCR Detection System lymphocyte type (Cas-L) (14) or human enhancer of filamenta- and SYBR-Green dye (both from Bio-Rad), according to the tion-1 (HEF1) (15), is a focal adhesion scaffold protein that was manufacturer's instructions. Oligonucleotide primers were initially identified by its developmentally regulated expression synthesized by Sangon Biotech Co., Ltd. (Shanghai, China). pattern in the early embryonic, but not adult, mouse brain (16). The primers used for the PCR reaction were: NEDD9, It also plays an integral role in natural and pathological cell forward: 5'-ATG TCC ACG TCT TCC ACC TCC-3' and biology (17). Overexpression of NEDD9 protein is correlated reverse: 5'-AGT GAC CAG TGC CAT TAG GCT G-3'; and with poor prognosis in various types of cancer, including breast GAPDH, forward: 5'-GAC AGT CAG CCG CAT CTT CT-3' cancer (18), glioblastoma (19) and melanoma (20). However, and reverse: 5'-TTA AAA GCA GCC CTG GTG AC-3'. The to the best of our knowledge, few available data address the primer sequences were verified by running a virtual PCR, and precise function of NEDD9 genes in HCC. the primer concentrations were optimized to avoid primer- In the present study, we investigated NEDD9 expression in dimer formation. Additionally, dissociation curves were primary human HCC tissues compared with matched adjacent evaluated to avoid non-specific amplification. The data were non-tumor hepatic tissues (ANHTs). Immunohistochemistry analyzed according to the comparative Ct method and were was performed to analyze the correlation of NEDD9 expression normalized to GAPDH expression in each sample. All of the with the clinicopathological factors of patients. Additionally, experiments were performed in triplicate. the potential prognostic utility of NEDD9 expression in HCC was analyzed, including in HCC patients with normal serum Protein extraction and western blotting. Total protein was AFP levels and with early-stage HCC. The results suggest that extracted using a lysis buffer (20 mmol/l Tris-HCl, pH 7.4; NEDD9 may be a valuable prognostic biomarker for HCC. 10 mmol/l NaCl; 1 mmol/l ethylene diamine tetraacetic acid, pH 8.0; 1 mmol/l MgCl2; 1% NP-40; 0.1% sodium dodecyl Materials and methods sulfate; 0.01% phenylmethylsulfonyl fluoride (Sigma, St. Louis, MO, USA); and 10 µl/ml protease inhibitor cocktail (Promega, Patients and tissue specimens. In the present study, HCC tissue Madison, WI, USA) incubated for 20 min at 4˚C. The protein specimens were obtained from 164 patients with HCC who concentration was determined using the Bio-Rad assay underwent hepatectomy in the Department of Hepatobiliary system, and proteins were separated by SDS-polyacrylamide and Pancreaticosplenic Surgery, Xijing Hospital (Xi'an, gel electrophoresis and then transferred onto polyvinylidine China) from 2004 to 2007. Specimens were obtained from fluoride membranes (Millipore, Bedford, MA, USA). The patients who had not received preoperative treatments, such blotted membranes were incubated with anti-human NEDD9 as chemotherapy, ethanol injection, radiofrequency ablation antibody (Abcam, Cambridge, UK), followed by a secondary or transarterial chemoembolization. These patients included antibody (KPL, Gaithersburg, MD, USA). The β-actin protein 133 men and 31 women, and the median patient age was levels were also determined, using this specific antibody 49 years (range, 29-81 years). (Sigma) as a loading control. Subsequently, the protein bands The present study was approved by the Ethics Committee were detected using the enhanced chemiluminescence detec- of the Fourth Military Medical University, and it conformed tion system (Amersham Pharmacia Biotech, Piscataway, NJ, to the ethical guidelines of the 2004 Declaration of Helsinki. USA). The western blot analyses were quantified using laser Written informed consent was obtained from each patient or densitometry, and the relative protein expression
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