INIRODUCTIONAccording to the therapeutic effect and strategy ofantisense RNA for hepatoccllular carcinoma(HCC),we have specifically synthesized partialcDNA of human insulin-like growth factor Ⅱ(IGF-Ⅱ)and constructed...INIRODUCTIONAccording to the therapeutic effect and strategy ofantisense RNA for hepatoccllular carcinoma(HCC),we have specifically synthesized partialcDNA of human insulin-like growth factor Ⅱ(IGF-Ⅱ)and constructed IGF-Ⅱ cDNA antisenseeukaryotic expression vector.The constructedvector was introduced into hepatoma cell lineSMMC-7721 to block the intrinsic IGF-Ⅱexpression.The biological behavior changes ofhepatoma cells were observed.All these展开更多
AIM To study hepatocarcinogenesis of hepatitis C virus (HCV). METHODS Expression of HCV antigens (CP10, NS3 and NS5) and several cancer associated gene products (ras p21, c myc, c erbB 2, mutated p53 and p16 pr...AIM To study hepatocarcinogenesis of hepatitis C virus (HCV). METHODS Expression of HCV antigens (CP10, NS3 and NS5) and several cancer associated gene products (ras p21, c myc, c erbB 2, mutated p53 and p16 protein) in the tissues of hepatocellular carcinoma (HCC, n =46) and its surrounding liver tissue were studied by the ABC (avidin biotin complex) immunohistochemical method. The effect of HCV infection on expression of those gene products in HCC was analyzed by comparing HCV antigen positive group with HCV antigen negative group. RESULTS Positive immunostaining with one, two or three HCV antigens was found in 20 (43 5%) cases, with either of two or three HCV antigens in 16 (34 8%) cases, and with three HCV antigens in 9 (19 6%) cases. Deletion rate of p16 protein expression in HCC with positive HCV antigen (80%, 16/20) was significantly higher than that in HCC with negative HCV antigen. Whereas no significant difference of the other gene product expression was observed between the two groups. CONCLUSION HCV appears related to about one third of cases of HCC in Chongqing, the southwest of China, and it may be involved in hepatocarcinogenesis by inhibiting the function of p16 gene, which acts as a negative regulator of cell cycle.展开更多
AIM To investigate the hepatitis C virus(HCV)infection in the tissues of carcinoma ofextrahepatic bile duct and study theircorrelation.METHODS HCV NS5 protein and HCV RNA weredetected by labeled streptavidin biotin(LS...AIM To investigate the hepatitis C virus(HCV)infection in the tissues of carcinoma ofextrahepatic bile duct and study theircorrelation.METHODS HCV NS5 protein and HCV RNA weredetected by labeled streptavidin biotin(LSAB)method and in situ reverse transcriptionpolymerase chain reaction(IS-RT-PCR)insections of 51 cases of carcinoma ofextrahepatic bile duct and 34 cases of controlgroup(without malignant biliary disease).RESULTS In 51 cases of carcinoma ofextrahepatic bile duct,HCV NS5 protein wasdetected in 14(27.5%),which was clearlystained in the cytoplasm of cancer cell but not inthe nucleus or cell membrane.HCV RNA wasdetected in 18(35.4%),which was located inthe nucleus of cancer cell in 12 cases and in thecytoplasm in 6 cases.HCV NS5 protein and RNAcoexistence was found in 2 cases.In 34 cases ofcontrol group,HCV RNA was detected in 2(5.9%).HCV NS5 protein and RNA positive cellswere found either scattered or in clusters.CONCLUSION The prevalence of hepatitis C viral infection in the tissues of carcinoma ofextrahepatic bile duct was significantly higherthan in control group(X^2=9.808,P=0.002).The findings suggest a correlation between HCVinfection and carcinoma of extrahepatic bileduct,which is different from the traditionalviewpoint.HCV infection might be involved inthe development of carcinoma of extrahepaticbile duct.展开更多
INTRODUCTIONLiver surgery,was started in the late 1950s in Chinaand has developed rapidly in the past 40 years.The study on the diagnosis and treatment of primaryliver cancer in China underwent four stages:①Inthe 195...INTRODUCTIONLiver surgery,was started in the late 1950s in Chinaand has developed rapidly in the past 40 years.The study on the diagnosis and treatment of primaryliver cancer in China underwent four stages:①Inthe 1950s,the anatomical study of the liver lay asolid foundation for liver resection.①In展开更多
As for many other tumors,development of hepatocellular carcinoma(HCC)must be understood as a multistep process with accumulation of genetic and epigenetic alterations in regulatory genes,leading to activation of oncog...As for many other tumors,development of hepatocellular carcinoma(HCC)must be understood as a multistep process with accumulation of genetic and epigenetic alterations in regulatory genes,leading to activation of oncogenes and inactivation or loss of tumor suppressor genes(TSG).In the last decades,in addition to genetic alterations,epigenetic inactivation of(tumor suppressor) genes by promoter hypermet hylation has been recognized as an important and alternative mechanism in tumorigenesis.In HCC,aberrant methylation of promoter sequences occurs not only in advanced tumors, it has been also observed in premalignant conditions just as chronic viral hepatitis B or C and cirrhotic liver. This review discusses the epigenetic alterations in hepatocellular carcinoma focusing DNA methylation.展开更多
Objective To search for new putative tumor suppressor genes in colorectal carcinoma. Methods Subtractive hybridization technologies were applied to screen and select genes, the expression of which was down regula...Objective To search for new putative tumor suppressor genes in colorectal carcinoma. Methods Subtractive hybridization technologies were applied to screen and select genes, the expression of which was down regulated in colorectal carcinoma. mRNAs uniquely expressed in normal cells but not in colorectal carcinoma were recovered as cDNA (sub cDNA) after two rounds of subtractive hybridization with mRNA prepared from colorectal carcinoma. The sub cDNAs were then used as probes to screen a normal human colon cDNA library constructed in lambda Zap II phage. The DNAs of positive clones were in vivo excised, and partial DNA sequences were analyzed and compared with DNA sequence database Genbank. Results A total of 46 different clones with an average of about 1 kilobases in transcript size was recovered. Among these 46 down regulated genes in colorectal carcinoma were genes encoding immunoglobulin (n=32), 40 kDa keratin intermediate filamentous protein or IFP (n=1), major histocompatibility complex related protein (n=1), unrelated structural proteins (n=10) and gene products yet to be identified (n=2). RNA dot blot hybridizations confirmed that all 46 clones contained genes that were down regulated and have not been reported before in colorectal carcinoma. Conclusions The results of this study suggested that the 46 clones were down regulated in colorectal carcinoma,they should be further studied as new putative tumor suppressor genes and could be used as new tumor markers of colorectal carcinoma.展开更多
AIM: To study the loss of heterozygosity (LOH) at 8p21-23 locus in diffuse gastric cancer.METHODS: To evaluate the involvement of this region in gastric cancer, we used eight microsatellite markers covering two Mb of ...AIM: To study the loss of heterozygosity (LOH) at 8p21-23 locus in diffuse gastric cancer.METHODS: To evaluate the involvement of this region in gastric cancer, we used eight microsatellite markers covering two Mb of mentioned region, to perform a high-resolution analysis of allele loss in 42 cases of late diffuse gastric adenocarcinoma.RESULTS: Six of these STS makers: D8S1149, D8S1645, D8S1643, D8S1508, D8S1591, and D8S1145 showed 36%, 28%, 37%, 41%, 44% and 53% LOH, respectively.CONCLUSION: A critical region of loss, close to the NAT2 locus and relatively far from FEZ1 gene currently postulated as tumor suppressor gene in this region.展开更多
AIM： To investigate the promoter region methylation status of retinoblastoma protein-interacting zinc finger gene 1 （RIZ1） in the human esophageal squamous cell carcinoma （ESCC） cell lines and tissues and verify ...AIM： To investigate the promoter region methylation status of retinoblastoma protein-interacting zinc finger gene 1 （RIZ1） in the human esophageal squamous cell carcinoma （ESCC） cell lines and tissues and verify the relationship between methylation of RIZ1 and oncogen- esis, tumor progression and metastasis etc of ESCC. METHODS： Methylation-specific polymerase chain reac- tion （MSP） was used to investigate the promoter region methylation status of RIZ1 in 6 ESCC cell lines. One cell line where RIZ1 promoter region methylation was de- tected was selected for the next study, where the cell line was treated with 5-aza-CdR. Real-time polymerase chain reaction was used to investigate its influence on the transcription of RIZ1. Experiments using frozenpathological specimens from 47 ESCC patients were performed using the same MSP methodology. RESULTS： Promoter methylation of RIZ1 gene was detected in TEl3, CaEs17 and EC109 cell lines and the cell line TEl3 was chosen for further study. The expression of RIZl mRNA in TE-13 was up-regulated after treatment with 5-aza-CdR. The rate of methyla- tion in carcinomas tissues was significantly higher than those in matched neighboring normal and distal ending normal tissue, and the deviation of data was statisti- cally significant （2,2 = 24.136, P 〈 0.01）. Analysis of the gender, age familial history, tumour deviation, tumour saturation, lymph gland displacement and clinical stag- ing of 47 samples from ESCC patients showed that the fluctuation of data was not statistically significant. CONCLUSION： Promoter methylation may play an im- portant role in the epigenetic silencing of RIZ1 gene expression in human ESCC. RIZ1 is considered to be a potential tumor suppressor gene and may be a biologi- cal parameter for testing early stage human ESCC.展开更多
基金the National Natural Science Foundation of Guangdong Province,No.940319.
文摘INIRODUCTIONAccording to the therapeutic effect and strategy ofantisense RNA for hepatoccllular carcinoma(HCC),we have specifically synthesized partialcDNA of human insulin-like growth factor Ⅱ(IGF-Ⅱ)and constructed IGF-Ⅱ cDNA antisenseeukaryotic expression vector.The constructedvector was introduced into hepatoma cell lineSMMC-7721 to block the intrinsic IGF-Ⅱexpression.The biological behavior changes ofhepatoma cells were observed.All these
文摘AIM To study hepatocarcinogenesis of hepatitis C virus (HCV). METHODS Expression of HCV antigens (CP10, NS3 and NS5) and several cancer associated gene products (ras p21, c myc, c erbB 2, mutated p53 and p16 protein) in the tissues of hepatocellular carcinoma (HCC, n =46) and its surrounding liver tissue were studied by the ABC (avidin biotin complex) immunohistochemical method. The effect of HCV infection on expression of those gene products in HCC was analyzed by comparing HCV antigen positive group with HCV antigen negative group. RESULTS Positive immunostaining with one, two or three HCV antigens was found in 20 (43 5%) cases, with either of two or three HCV antigens in 16 (34 8%) cases, and with three HCV antigens in 9 (19 6%) cases. Deletion rate of p16 protein expression in HCC with positive HCV antigen (80%, 16/20) was significantly higher than that in HCC with negative HCV antigen. Whereas no significant difference of the other gene product expression was observed between the two groups. CONCLUSION HCV appears related to about one third of cases of HCC in Chongqing, the southwest of China, and it may be involved in hepatocarcinogenesis by inhibiting the function of p16 gene, which acts as a negative regulator of cell cycle.
文摘AIM To investigate the hepatitis C virus(HCV)infection in the tissues of carcinoma ofextrahepatic bile duct and study theircorrelation.METHODS HCV NS5 protein and HCV RNA weredetected by labeled streptavidin biotin(LSAB)method and in situ reverse transcriptionpolymerase chain reaction(IS-RT-PCR)insections of 51 cases of carcinoma ofextrahepatic bile duct and 34 cases of controlgroup(without malignant biliary disease).RESULTS In 51 cases of carcinoma ofextrahepatic bile duct,HCV NS5 protein wasdetected in 14(27.5%),which was clearlystained in the cytoplasm of cancer cell but not inthe nucleus or cell membrane.HCV RNA wasdetected in 18(35.4%),which was located inthe nucleus of cancer cell in 12 cases and in thecytoplasm in 6 cases.HCV NS5 protein and RNAcoexistence was found in 2 cases.In 34 cases ofcontrol group,HCV RNA was detected in 2(5.9%).HCV NS5 protein and RNA positive cellswere found either scattered or in clusters.CONCLUSION The prevalence of hepatitis C viral infection in the tissues of carcinoma ofextrahepatic bile duct was significantly higherthan in control group(X^2=9.808,P=0.002).The findings suggest a correlation between HCVinfection and carcinoma of extrahepatic bileduct,which is different from the traditionalviewpoint.HCV infection might be involved inthe development of carcinoma of extrahepaticbile duct.
文摘INTRODUCTIONLiver surgery,was started in the late 1950s in Chinaand has developed rapidly in the past 40 years.The study on the diagnosis and treatment of primaryliver cancer in China underwent four stages:①Inthe 1950s,the anatomical study of the liver lay asolid foundation for liver resection.①In
文摘As for many other tumors,development of hepatocellular carcinoma(HCC)must be understood as a multistep process with accumulation of genetic and epigenetic alterations in regulatory genes,leading to activation of oncogenes and inactivation or loss of tumor suppressor genes(TSG).In the last decades,in addition to genetic alterations,epigenetic inactivation of(tumor suppressor) genes by promoter hypermet hylation has been recognized as an important and alternative mechanism in tumorigenesis.In HCC,aberrant methylation of promoter sequences occurs not only in advanced tumors, it has been also observed in premalignant conditions just as chronic viral hepatitis B or C and cirrhotic liver. This review discusses the epigenetic alterations in hepatocellular carcinoma focusing DNA methylation.
文摘Objective To search for new putative tumor suppressor genes in colorectal carcinoma. Methods Subtractive hybridization technologies were applied to screen and select genes, the expression of which was down regulated in colorectal carcinoma. mRNAs uniquely expressed in normal cells but not in colorectal carcinoma were recovered as cDNA (sub cDNA) after two rounds of subtractive hybridization with mRNA prepared from colorectal carcinoma. The sub cDNAs were then used as probes to screen a normal human colon cDNA library constructed in lambda Zap II phage. The DNAs of positive clones were in vivo excised, and partial DNA sequences were analyzed and compared with DNA sequence database Genbank. Results A total of 46 different clones with an average of about 1 kilobases in transcript size was recovered. Among these 46 down regulated genes in colorectal carcinoma were genes encoding immunoglobulin (n=32), 40 kDa keratin intermediate filamentous protein or IFP (n=1), major histocompatibility complex related protein (n=1), unrelated structural proteins (n=10) and gene products yet to be identified (n=2). RNA dot blot hybridizations confirmed that all 46 clones contained genes that were down regulated and have not been reported before in colorectal carcinoma. Conclusions The results of this study suggested that the 46 clones were down regulated in colorectal carcinoma,they should be further studied as new putative tumor suppressor genes and could be used as new tumor markers of colorectal carcinoma.
基金Supported by Research Center of Gastric and Liver Disease in Tehran Taleghani hospital
文摘AIM: To study the loss of heterozygosity (LOH) at 8p21-23 locus in diffuse gastric cancer.METHODS: To evaluate the involvement of this region in gastric cancer, we used eight microsatellite markers covering two Mb of mentioned region, to perform a high-resolution analysis of allele loss in 42 cases of late diffuse gastric adenocarcinoma.RESULTS: Six of these STS makers: D8S1149, D8S1645, D8S1643, D8S1508, D8S1591, and D8S1145 showed 36%, 28%, 37%, 41%, 44% and 53% LOH, respectively.CONCLUSION: A critical region of loss, close to the NAT2 locus and relatively far from FEZ1 gene currently postulated as tumor suppressor gene in this region.
基金Supported by Grant-in-aid from Specialized Research Fund for the Doctoral Program of Higher Education,No. 20091202110009Grant-in-aid from Natural Science Foundation of Tianjin,No. 10JCYBJC11300
文摘AIM： To investigate the promoter region methylation status of retinoblastoma protein-interacting zinc finger gene 1 （RIZ1） in the human esophageal squamous cell carcinoma （ESCC） cell lines and tissues and verify the relationship between methylation of RIZ1 and oncogen- esis, tumor progression and metastasis etc of ESCC. METHODS： Methylation-specific polymerase chain reac- tion （MSP） was used to investigate the promoter region methylation status of RIZ1 in 6 ESCC cell lines. One cell line where RIZ1 promoter region methylation was de- tected was selected for the next study, where the cell line was treated with 5-aza-CdR. Real-time polymerase chain reaction was used to investigate its influence on the transcription of RIZ1. Experiments using frozenpathological specimens from 47 ESCC patients were performed using the same MSP methodology. RESULTS： Promoter methylation of RIZ1 gene was detected in TEl3, CaEs17 and EC109 cell lines and the cell line TEl3 was chosen for further study. The expression of RIZl mRNA in TE-13 was up-regulated after treatment with 5-aza-CdR. The rate of methyla- tion in carcinomas tissues was significantly higher than those in matched neighboring normal and distal ending normal tissue, and the deviation of data was statisti- cally significant （2,2 = 24.136, P 〈 0.01）. Analysis of the gender, age familial history, tumour deviation, tumour saturation, lymph gland displacement and clinical stag- ing of 47 samples from ESCC patients showed that the fluctuation of data was not statistically significant. CONCLUSION： Promoter methylation may play an im- portant role in the epigenetic silencing of RIZ1 gene expression in human ESCC. RIZ1 is considered to be a potential tumor suppressor gene and may be a biologi- cal parameter for testing early stage human ESCC.
