AIM:To observe the anti-liver cancer activity of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) gene and its bystander effects on hepatocellular carcinoma (HCC) cell line SMMC7721.METHODS:Full-length ...AIM:To observe the anti-liver cancer activity of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) gene and its bystander effects on hepatocellular carcinoma (HCC) cell line SMMC7721.METHODS:Full-length cDNA of human TRAIL was transferred into SMMC7721 cells with a binary adenoviral vector system.Polymerase-chain reaction following reverse transcription (RT-PCR) was used to determine the expression of TRAIL gene. Effects of the transfected gene on proliferation of SMMC7721 cells were measured by MTT assay. Its influence on apoptosis was demonstrated by fluorescence-activated cell sorting (FACS). The bystander effect was observed by co-culturing the SMMC7721 cells with and without the transfected TRAIL gene at different ratios, and the culture medium supernatant from the transfected cells was also examined for its influence on SMMC7721 cells.RESULTS:The growth-inhibition rate and apoptotic cell fraction in the cells transfected with the TRAIL gene, Bax gene or only LacZ gene were 91.2%, 48.0%, 28.8% and 29.1%, 12.5%, 6.6%, respectively. The growth-inhibition rate of transfection with these three sequences in normal human fibroblasts was 6.1%, 45.5% and 7.6%, respectively,indicating a discriminative inhibition of TRAIL transfection on the cancer cells. In the co-culturing test, addition of the transfected TRAIL to SMMC7721 cells in proportions of 5%,25%, 50%, 75% and 100%, resulted in a growth-inhibition of 15.9%, 67%, 80.2%, 86.4% and 87.7%, respectively.We failed to observe a significant growth-inhibition effect of the culture medium supernatant on SMMC7721 cells.CONCLUSION: TRAIL gene transferred by a binary adenoviral vector system can inhibit proliferation of SMMC7721 cellsand induce their apoptosis. A bystander effect was observed,which seemed not to be mediated by soluble factors.展开更多
OBJECTIVE To investigate the relationship between BMI, WHR and biliary tract cancers (CBT).METHODS A population-based case-control study was conducted in urban Shanghai from June 1, 1997 to May 31,2001 involving inter...OBJECTIVE To investigate the relationship between BMI, WHR and biliary tract cancers (CBT).METHODS A population-based case-control study was conducted in urban Shanghai from June 1, 1997 to May 31,2001 involving interviews with 627 new cases of biliary tract cancers aged 35 to 74 years and 959 frequency-matched population controls by gender and age in five-year groups. All subjects were interviewed in person by trained interviewers using a structured questionnaire. An unconditional logistic regression was performed to calculate adjusted odds ratios (ORs) and 95% confidence intervals (CIs).RESULTS Obesity was associated with an increased risk of gallbladder cancer across adulthood at ages 20-29 and 30-39 in females. Compared with subjects in the lowest quartile of WHR, ORs for the highest quartile and P for trend for cancers of gallbladder and extrahepatic bile duct both reached significant levels among males and females.CONCLUSION Our observations in urban Shanghai suggested that obesity in early adult life may contribute to the risk of gallbladder cancer, and increased WHR may substantially elevated risk of cancers of the gallbladder and extrahepatic bile duct.展开更多
Purpose: The aim of this study is to investigate whether there are any abnormalities in the in vivo expression of retinoid acid receptors (RAR-α , RAR-β and RAR-γ ) and retinoid X receptors (RXR-α , RXR-β and RXR...Purpose: The aim of this study is to investigate whether there are any abnormalities in the in vivo expression of retinoid acid receptors (RAR-α , RAR-β and RAR-γ ) and retinoid X receptors (RXR-α , RXR-β and RXR-γ ) in sebaceous cell carcinoma. Methods: Expression of retinoid receptors in paired specimens of cancerous tissues (n = 10) and adjacent normal tissues (n = 10) from 10 patients with sebaceous cell carcinoma was studied immunohistochemically by using anti-retinoid receptor antibodies. Results: In eight of the 10 normal tissue samples, all six receptors were expressed. In the other two samples, all receptors were expressed except RAR-γ (one sample) or RXR-γ (two samples). Five tumours (50% ) lacked RAR-α ; RAR-α expression was lower in tumours than in normal tissues in eight of 10 cases. RAR-β was expressed in the cytoplasm of nine of 10 tumours; RAR-β expression was at least as high in tumours as in normal tissue in eight of 10 cases. Two tumours lacked RAR-γ ; three tumours had lower RAR-γ expression than paired normal epithelium; four had the same RAR-γ expression, and one had higher RAR-γ expression. RXR-α expression was strong in all normal tissues and tumour samples. Ten tumours lacked RXR-β and all 10 tumours lacked RXR-γ expression. Conclusions: Diminished RXR-β and RXR-γ expression might be related to the development of sebaceous cell carcinoma. Additional studies are required to establish whether the defects in RAR expression in sebaceous cell carcinoma might affect the potential response of this tumour to treatment with retinoids.展开更多
基金Supported by the National Natural Science Foundation of China,No.30271467
文摘AIM:To observe the anti-liver cancer activity of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) gene and its bystander effects on hepatocellular carcinoma (HCC) cell line SMMC7721.METHODS:Full-length cDNA of human TRAIL was transferred into SMMC7721 cells with a binary adenoviral vector system.Polymerase-chain reaction following reverse transcription (RT-PCR) was used to determine the expression of TRAIL gene. Effects of the transfected gene on proliferation of SMMC7721 cells were measured by MTT assay. Its influence on apoptosis was demonstrated by fluorescence-activated cell sorting (FACS). The bystander effect was observed by co-culturing the SMMC7721 cells with and without the transfected TRAIL gene at different ratios, and the culture medium supernatant from the transfected cells was also examined for its influence on SMMC7721 cells.RESULTS:The growth-inhibition rate and apoptotic cell fraction in the cells transfected with the TRAIL gene, Bax gene or only LacZ gene were 91.2%, 48.0%, 28.8% and 29.1%, 12.5%, 6.6%, respectively. The growth-inhibition rate of transfection with these three sequences in normal human fibroblasts was 6.1%, 45.5% and 7.6%, respectively,indicating a discriminative inhibition of TRAIL transfection on the cancer cells. In the co-culturing test, addition of the transfected TRAIL to SMMC7721 cells in proportions of 5%,25%, 50%, 75% and 100%, resulted in a growth-inhibition of 15.9%, 67%, 80.2%, 86.4% and 87.7%, respectively.We failed to observe a significant growth-inhibition effect of the culture medium supernatant on SMMC7721 cells.CONCLUSION: TRAIL gene transferred by a binary adenoviral vector system can inhibit proliferation of SMMC7721 cellsand induce their apoptosis. A bystander effect was observed,which seemed not to be mediated by soluble factors.
文摘OBJECTIVE To investigate the relationship between BMI, WHR and biliary tract cancers (CBT).METHODS A population-based case-control study was conducted in urban Shanghai from June 1, 1997 to May 31,2001 involving interviews with 627 new cases of biliary tract cancers aged 35 to 74 years and 959 frequency-matched population controls by gender and age in five-year groups. All subjects were interviewed in person by trained interviewers using a structured questionnaire. An unconditional logistic regression was performed to calculate adjusted odds ratios (ORs) and 95% confidence intervals (CIs).RESULTS Obesity was associated with an increased risk of gallbladder cancer across adulthood at ages 20-29 and 30-39 in females. Compared with subjects in the lowest quartile of WHR, ORs for the highest quartile and P for trend for cancers of gallbladder and extrahepatic bile duct both reached significant levels among males and females.CONCLUSION Our observations in urban Shanghai suggested that obesity in early adult life may contribute to the risk of gallbladder cancer, and increased WHR may substantially elevated risk of cancers of the gallbladder and extrahepatic bile duct.
文摘Purpose: The aim of this study is to investigate whether there are any abnormalities in the in vivo expression of retinoid acid receptors (RAR-α , RAR-β and RAR-γ ) and retinoid X receptors (RXR-α , RXR-β and RXR-γ ) in sebaceous cell carcinoma. Methods: Expression of retinoid receptors in paired specimens of cancerous tissues (n = 10) and adjacent normal tissues (n = 10) from 10 patients with sebaceous cell carcinoma was studied immunohistochemically by using anti-retinoid receptor antibodies. Results: In eight of the 10 normal tissue samples, all six receptors were expressed. In the other two samples, all receptors were expressed except RAR-γ (one sample) or RXR-γ (two samples). Five tumours (50% ) lacked RAR-α ; RAR-α expression was lower in tumours than in normal tissues in eight of 10 cases. RAR-β was expressed in the cytoplasm of nine of 10 tumours; RAR-β expression was at least as high in tumours as in normal tissue in eight of 10 cases. Two tumours lacked RAR-γ ; three tumours had lower RAR-γ expression than paired normal epithelium; four had the same RAR-γ expression, and one had higher RAR-γ expression. RXR-α expression was strong in all normal tissues and tumour samples. Ten tumours lacked RXR-β and all 10 tumours lacked RXR-γ expression. Conclusions: Diminished RXR-β and RXR-γ expression might be related to the development of sebaceous cell carcinoma. Additional studies are required to establish whether the defects in RAR expression in sebaceous cell carcinoma might affect the potential response of this tumour to treatment with retinoids.
