AIM:There are conflicting data about p53 function on cellular sensitivity to the cytotoxic action of 5-fluorouracil (5-FU). Therefore the objective of this study was to determine the combined effects of adenovirus-med...AIM:There are conflicting data about p53 function on cellular sensitivity to the cytotoxic action of 5-fluorouracil (5-FU). Therefore the objective of this study was to determine the combined effects of adenovirus-mediated wild-type (wt) p53 gene transfer and 5-FU chemotherapy on pancreatic cancer cells with different p53 gene status. METHODS:Human pancreatic cancer cell lines Capan-1^(p53mut), Capan-2^(p53wt),FAMPAC^(p53mut),PANC1^(p53mut),and rat pancreatic cancer cell lines AS^(p53wt) and DSL6A^(p53null) were used for in vitro studies.Following infection with different ratios of Ad- p53-particles (MOI) in combination with 5-FU,proliferation of tumor cells and apoptosis were quantified by cell proliferation assay (WST-1) and FACS (PI-staining).In addition,DSL6A syngeneic pancreatic tumor cells were inoculated subcutaneously in to Lewis rats for in vivo studies. Tumor size,apoptosis (TUNEL) and survival were determined. RESULTS:Ad-p53 gene transfer combined with 5-FU significantly inhibited tumor cell proliferation and substantially enhanced apoptosis in all four cell lines with an alteration in the p53 gene compared to those two cell lines containing wt-p53.In vivo experiments showed the most effective tumor regression in animals treated with Ad-p53 plus 5-FU.Both in vitro and in vivo analyses revealed that a sublethal dose of Ad-p53 augmented the apoptotic response induced by 5-FU. CONCLUSION:Our results suggest that Ad-p53 may synergistically enhance 5-FU-chemosensitivity most strikingly in pancreatic cancer cells lacking p53 function.These findings illustrate that the anticancer efficacy of this combination treatment is dependent on the p53 gene status of the target tumor cells.展开更多
AIM: To evaluate antihepatoma effect of antisense phosphorothioate oligodeoxyribonucleotides (S-ODNs) targeted to alpha-fetoprotein (AFP) genes in vitro and in nude mice. METHODS: AFP gene expression was examined by i...AIM: To evaluate antihepatoma effect of antisense phosphorothioate oligodeoxyribonucleotides (S-ODNs) targeted to alpha-fetoprotein (AFP) genes in vitro and in nude mice. METHODS: AFP gene expression was examined by immunocytochemical method or enzyme-linked immunosorbent assay. Effect of S-ODNs on SMMC-7721 human hepatoma cell growth in vitro was determined using microculture tetrazolium assay. In vitro antitumor activities of S-ODNs were monitored by measuring tumor weight differences in treated and control mice bearing SMMC-7721 xenografts. Induction of cell apoptosis was evaluated by fluorescence-activated cell sorter (FACS) analysis. RESULTS: Antisense S-ODN treatment led to reduced AFP gene expression. Specific antisense S-ODNs, but not control S-ODNs, inhibited the growth of hepatoma cells in vitro. In vitro, only antisense S-ODNs exhibited obvious antitumor activities. FACS analysis revealed that the growth inhibition by antisense S-ODNs was associated with their cell apoptosis induction. CONCLUSION: Antisense S-ODNs targeted to AFP genes inhibit the growth of human hepatoma cells and solid hepatoma, which is related to their cell apoptosis induction.展开更多
目的:研究赤芍总苷对肺癌模型大鼠抑癌相关基因表达的影响。方法:将90只大鼠随机分为正常组、模型组、阳性对照组[环磷酰胺,50 mg/(kg·d)]和赤芍总苷低、中、高剂量组[50、100、200 mg/(kg·d)],每组15只。除正常组外,其余各...目的:研究赤芍总苷对肺癌模型大鼠抑癌相关基因表达的影响。方法:将90只大鼠随机分为正常组、模型组、阳性对照组[环磷酰胺,50 mg/(kg·d)]和赤芍总苷低、中、高剂量组[50、100、200 mg/(kg·d)],每组15只。除正常组外,其余各组大鼠均采用左肺叶支气管内一次性灌注致癌碘油液复制肺癌模型,造模成功后,每周周一至周五各组大鼠于背iv相应药物,正常组和模型组iv等体积生理盐水,连续16周。采用逆转录-聚合酶链反应法测定大鼠肺组织中多药耐药相关蛋白(MRP)、人多药耐药基因(MDR1)和凋亡相关基因P21、P16 m RNA的表达;采用免疫组化法测定肺组织中抑癌基因P53蛋白的表达,计算其阳性率;观察肺组织病理变化。结果:与正常组比较,模型组大鼠肺组织中MRP、MDR1、P21、P16 m RNA及P53蛋白表达(阳性率为66.67%)水平明显升高(P<0.05);与模型组比较,阳性对照组和赤芍总苷低、中、高剂量组大鼠肺组织中MRP、MDR1、P21、P16 m RNA及P53蛋白表达(阳性率分别为46.67%、46.67%、40.00%、13.33%)水平降低并呈剂量依赖性,且赤芍总苷中、高剂量组比阳性对照组降低程度更显著(P<0.05);赤芍总苷各剂量组间比较,各指标差异均有统计学意义(P<0.05)。结论:赤芍总苷可明显抑制肺癌模型大鼠MRP、MDR1、P21、P16基因及P53蛋白的表达。展开更多
文摘AIM:There are conflicting data about p53 function on cellular sensitivity to the cytotoxic action of 5-fluorouracil (5-FU). Therefore the objective of this study was to determine the combined effects of adenovirus-mediated wild-type (wt) p53 gene transfer and 5-FU chemotherapy on pancreatic cancer cells with different p53 gene status. METHODS:Human pancreatic cancer cell lines Capan-1^(p53mut), Capan-2^(p53wt),FAMPAC^(p53mut),PANC1^(p53mut),and rat pancreatic cancer cell lines AS^(p53wt) and DSL6A^(p53null) were used for in vitro studies.Following infection with different ratios of Ad- p53-particles (MOI) in combination with 5-FU,proliferation of tumor cells and apoptosis were quantified by cell proliferation assay (WST-1) and FACS (PI-staining).In addition,DSL6A syngeneic pancreatic tumor cells were inoculated subcutaneously in to Lewis rats for in vivo studies. Tumor size,apoptosis (TUNEL) and survival were determined. RESULTS:Ad-p53 gene transfer combined with 5-FU significantly inhibited tumor cell proliferation and substantially enhanced apoptosis in all four cell lines with an alteration in the p53 gene compared to those two cell lines containing wt-p53.In vivo experiments showed the most effective tumor regression in animals treated with Ad-p53 plus 5-FU.Both in vitro and in vivo analyses revealed that a sublethal dose of Ad-p53 augmented the apoptotic response induced by 5-FU. CONCLUSION:Our results suggest that Ad-p53 may synergistically enhance 5-FU-chemosensitivity most strikingly in pancreatic cancer cells lacking p53 function.These findings illustrate that the anticancer efficacy of this combination treatment is dependent on the p53 gene status of the target tumor cells.
基金Supported by the National Postdoctoral Science Foundation of China,No.199711.
文摘AIM: To evaluate antihepatoma effect of antisense phosphorothioate oligodeoxyribonucleotides (S-ODNs) targeted to alpha-fetoprotein (AFP) genes in vitro and in nude mice. METHODS: AFP gene expression was examined by immunocytochemical method or enzyme-linked immunosorbent assay. Effect of S-ODNs on SMMC-7721 human hepatoma cell growth in vitro was determined using microculture tetrazolium assay. In vitro antitumor activities of S-ODNs were monitored by measuring tumor weight differences in treated and control mice bearing SMMC-7721 xenografts. Induction of cell apoptosis was evaluated by fluorescence-activated cell sorter (FACS) analysis. RESULTS: Antisense S-ODN treatment led to reduced AFP gene expression. Specific antisense S-ODNs, but not control S-ODNs, inhibited the growth of hepatoma cells in vitro. In vitro, only antisense S-ODNs exhibited obvious antitumor activities. FACS analysis revealed that the growth inhibition by antisense S-ODNs was associated with their cell apoptosis induction. CONCLUSION: Antisense S-ODNs targeted to AFP genes inhibit the growth of human hepatoma cells and solid hepatoma, which is related to their cell apoptosis induction.
文摘目的:研究赤芍总苷对肺癌模型大鼠抑癌相关基因表达的影响。方法:将90只大鼠随机分为正常组、模型组、阳性对照组[环磷酰胺,50 mg/(kg·d)]和赤芍总苷低、中、高剂量组[50、100、200 mg/(kg·d)],每组15只。除正常组外,其余各组大鼠均采用左肺叶支气管内一次性灌注致癌碘油液复制肺癌模型,造模成功后,每周周一至周五各组大鼠于背iv相应药物,正常组和模型组iv等体积生理盐水,连续16周。采用逆转录-聚合酶链反应法测定大鼠肺组织中多药耐药相关蛋白(MRP)、人多药耐药基因(MDR1)和凋亡相关基因P21、P16 m RNA的表达;采用免疫组化法测定肺组织中抑癌基因P53蛋白的表达,计算其阳性率;观察肺组织病理变化。结果:与正常组比较,模型组大鼠肺组织中MRP、MDR1、P21、P16 m RNA及P53蛋白表达(阳性率为66.67%)水平明显升高(P<0.05);与模型组比较,阳性对照组和赤芍总苷低、中、高剂量组大鼠肺组织中MRP、MDR1、P21、P16 m RNA及P53蛋白表达(阳性率分别为46.67%、46.67%、40.00%、13.33%)水平降低并呈剂量依赖性,且赤芍总苷中、高剂量组比阳性对照组降低程度更显著(P<0.05);赤芍总苷各剂量组间比较,各指标差异均有统计学意义(P<0.05)。结论:赤芍总苷可明显抑制肺癌模型大鼠MRP、MDR1、P21、P16基因及P53蛋白的表达。
