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The role of death receptor 3 in the biological behavior of hepatocellular carcinoma cells.

Zhang YC, Guo LQ, Chen X, Wang GN, Ni R, Wang MC, Wei FX - Mol Med Rep (2014)

Bottom Line: Cell viability was significantly reduced by AF02670.1_stealth_883 and RNAi cocktail at 24, 48 and 72 h following transfection.DR3 silencing effectively inhibited proliferation and invasion of hepatocellular carcinoma cells in vitro.In conclusion, the results of the present study indicated that DR3 may be a promising therapeutic target molecule for further study of hepatocellular carcinoma gene therapy.

View Article: PubMed Central - PubMed

Affiliation: Department of General Surgery, Lanzhou University Second Hospital, Lanzhou, Gansu 730030, P.R. China.

ABSTRACT
Death receptor 3 (DR3) belongs to the tumor necrosis factor (TNF) receptor superfamily, primarily found in lymphoid tissues. Reports have determined that DR3 may also be distributed in numerous types of tumors. Therefore, it is thought that DR3 may have an important role in the process of tumorigenesis. The aim of the present study was to observe the effect of silencing DR3 expression on hepatocarcinoma cell growth, apoptosis and invasion in order to elucidate the role of DR3 in tumor development. The hepatocarcinoma cell lines (HepG2, Huh7, SMMC7721 and Bel‑7402) and normal human liver cells (HL‑7702) were transfected with three stealth RNA interference (RNAi) sequences that target the DR3 gene. Reverse transcription quantitative polymerase chain reaction was used to detect the expression levels of DR3 in hepatocarcinoma cell lines and normal liver HL‑7702 cells. MTT assay and flow cytometry (FCM) were used to determine the rates of cell proliferation and apoptosis, respectively. Following silencing of the DR3 gene, western blot analysis was used to determine the protein expression of P53, Fas, Caspase8, nuclear factor kappa‑light‑chain‑enhancer of activated B cells (NF‑κB) and Caspase3. DR3 messenger RNA (mRNA) expression in hepatocarcinoma cell lines was significantly increased compared with that in the normal liver cell line. Three targeted DR3 gene small interfering RNAs significantly inhibited DR3 gene expression in Bel‑7402 cells at the nucleic acid level. AF02670.1_stealth_883 and cocktail demonstrated the most efficient inhibition of DR3 gene expression at 48 and 72 h following transfection, with mRNA inhibition rates of 89.46 and 92.75%, and 90.53 and 94.25% (P<0.01), respectively. Cell viability was significantly reduced by AF02670.1_stealth_883 and RNAi cocktail at 24, 48 and 72 h following transfection. The inhibition rates of cell proliferation were 50.76 and 61.76% (P<0.05) at 72 h following transfection. FCM revealed that AF02670.1_stealth_883 and RNAi cocktail also induced apoptosis in Bel‑7402 cells at 72 h following transfection. Reduction of NF‑κB and P53 levels was observed (P<0.05) in Bel‑7402 cells following DR3 silencing, whereas levels of Fas, Caspase3 and Caspase8 were markedly elevated (P<0.05). DR3 expression levels in hepatocellular carcinoma cells were significantly higher than those in normal cells. DR3 silencing effectively inhibited proliferation and invasion of hepatocellular carcinoma cells in vitro. However, silencing of the DR3 gene affect levels of apoptosis antigen‑3 ligand in cells, therefore indicating that it may be involved with other pathways that regulate apoptosis in HCCs. In conclusion, the results of the present study indicated that DR3 may be a promising therapeutic target molecule for further study of hepatocellular carcinoma gene therapy.

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Detection of apoptosis by flow cytometry (48 h). (A) Normal Bel-7402 cell line, %Tot=0.203; (B) AF02670.1_stealth_883 interference, %Tot=8.663; (C) Apoptosis following transduction with cocktail, %Tot=10.425. Tot, total.
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f7-mmr-11-02-0797: Detection of apoptosis by flow cytometry (48 h). (A) Normal Bel-7402 cell line, %Tot=0.203; (B) AF02670.1_stealth_883 interference, %Tot=8.663; (C) Apoptosis following transduction with cocktail, %Tot=10.425. Tot, total.

Mentions: To determine the effects of DR3-silencing on apoptosis, a flow cytometric PI single-staining assay was used on Bel-7402 cells following 48 h transfection. PI staining revealed that following AF026070.1_stealth_883 or cocktail treatment, an apoptotic sub-G1 cell population was present, and the apoptotic rates were 8.663 and 10.425% (P<0.05) compared with those of the normal Bel-7402 cells at 0.203% (Fig. 7). In order to further investigate the occurrence of apoptosis, double staining with FITC/PI was used, the results of which demonstrated that following 72 h of transfection with AF026070.1_stealth_883 or cocktail, the proportion of apoptotic cells at the terminal stage was significantly increased compared to those in the negative and blank control groups (Fig. 8).


The role of death receptor 3 in the biological behavior of hepatocellular carcinoma cells.

Zhang YC, Guo LQ, Chen X, Wang GN, Ni R, Wang MC, Wei FX - Mol Med Rep (2014)

Detection of apoptosis by flow cytometry (48 h). (A) Normal Bel-7402 cell line, %Tot=0.203; (B) AF02670.1_stealth_883 interference, %Tot=8.663; (C) Apoptosis following transduction with cocktail, %Tot=10.425. Tot, total.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4262488&req=5

f7-mmr-11-02-0797: Detection of apoptosis by flow cytometry (48 h). (A) Normal Bel-7402 cell line, %Tot=0.203; (B) AF02670.1_stealth_883 interference, %Tot=8.663; (C) Apoptosis following transduction with cocktail, %Tot=10.425. Tot, total.
Mentions: To determine the effects of DR3-silencing on apoptosis, a flow cytometric PI single-staining assay was used on Bel-7402 cells following 48 h transfection. PI staining revealed that following AF026070.1_stealth_883 or cocktail treatment, an apoptotic sub-G1 cell population was present, and the apoptotic rates were 8.663 and 10.425% (P<0.05) compared with those of the normal Bel-7402 cells at 0.203% (Fig. 7). In order to further investigate the occurrence of apoptosis, double staining with FITC/PI was used, the results of which demonstrated that following 72 h of transfection with AF026070.1_stealth_883 or cocktail, the proportion of apoptotic cells at the terminal stage was significantly increased compared to those in the negative and blank control groups (Fig. 8).

Bottom Line: Cell viability was significantly reduced by AF02670.1_stealth_883 and RNAi cocktail at 24, 48 and 72 h following transfection.DR3 silencing effectively inhibited proliferation and invasion of hepatocellular carcinoma cells in vitro.In conclusion, the results of the present study indicated that DR3 may be a promising therapeutic target molecule for further study of hepatocellular carcinoma gene therapy.

View Article: PubMed Central - PubMed

Affiliation: Department of General Surgery, Lanzhou University Second Hospital, Lanzhou, Gansu 730030, P.R. China.

ABSTRACT
Death receptor 3 (DR3) belongs to the tumor necrosis factor (TNF) receptor superfamily, primarily found in lymphoid tissues. Reports have determined that DR3 may also be distributed in numerous types of tumors. Therefore, it is thought that DR3 may have an important role in the process of tumorigenesis. The aim of the present study was to observe the effect of silencing DR3 expression on hepatocarcinoma cell growth, apoptosis and invasion in order to elucidate the role of DR3 in tumor development. The hepatocarcinoma cell lines (HepG2, Huh7, SMMC7721 and Bel‑7402) and normal human liver cells (HL‑7702) were transfected with three stealth RNA interference (RNAi) sequences that target the DR3 gene. Reverse transcription quantitative polymerase chain reaction was used to detect the expression levels of DR3 in hepatocarcinoma cell lines and normal liver HL‑7702 cells. MTT assay and flow cytometry (FCM) were used to determine the rates of cell proliferation and apoptosis, respectively. Following silencing of the DR3 gene, western blot analysis was used to determine the protein expression of P53, Fas, Caspase8, nuclear factor kappa‑light‑chain‑enhancer of activated B cells (NF‑κB) and Caspase3. DR3 messenger RNA (mRNA) expression in hepatocarcinoma cell lines was significantly increased compared with that in the normal liver cell line. Three targeted DR3 gene small interfering RNAs significantly inhibited DR3 gene expression in Bel‑7402 cells at the nucleic acid level. AF02670.1_stealth_883 and cocktail demonstrated the most efficient inhibition of DR3 gene expression at 48 and 72 h following transfection, with mRNA inhibition rates of 89.46 and 92.75%, and 90.53 and 94.25% (P<0.01), respectively. Cell viability was significantly reduced by AF02670.1_stealth_883 and RNAi cocktail at 24, 48 and 72 h following transfection. The inhibition rates of cell proliferation were 50.76 and 61.76% (P<0.05) at 72 h following transfection. FCM revealed that AF02670.1_stealth_883 and RNAi cocktail also induced apoptosis in Bel‑7402 cells at 72 h following transfection. Reduction of NF‑κB and P53 levels was observed (P<0.05) in Bel‑7402 cells following DR3 silencing, whereas levels of Fas, Caspase3 and Caspase8 were markedly elevated (P<0.05). DR3 expression levels in hepatocellular carcinoma cells were significantly higher than those in normal cells. DR3 silencing effectively inhibited proliferation and invasion of hepatocellular carcinoma cells in vitro. However, silencing of the DR3 gene affect levels of apoptosis antigen‑3 ligand in cells, therefore indicating that it may be involved with other pathways that regulate apoptosis in HCCs. In conclusion, the results of the present study indicated that DR3 may be a promising therapeutic target molecule for further study of hepatocellular carcinoma gene therapy.

Show MeSH
Related in: MedlinePlus