INTRODUCTIONIt has been well known that MNNG is one of thestrong and multipotential carcinogens that havebeen frequently reported inducing malignant peptictumors.We have successfully induced rat and doggastric adenoca...INTRODUCTIONIt has been well known that MNNG is one of thestrong and multipotential carcinogens that havebeen frequently reported inducing malignant peptictumors.We have successfully induced rat and doggastric adenocarcinomas,squamous cell carcinomasof rat forestomach and gastric leiomyosarcoma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
We have previously shown that the lipofuscin in the brain seems to have in-creased in amount in autopsy cases of epidemic hemorrhagic fever.The purpose of thisstudy was to testify if there is really such an increase.L...We have previously shown that the lipofuscin in the brain seems to have in-creased in amount in autopsy cases of epidemic hemorrhagic fever.The purpose of thisstudy was to testify if there is really such an increase.Lipfuscin in 10 sections from everybrain of 10 autopsy cases,stained with Sudan Ⅳ,Sudan black and H.E.,was carefully es-timated and found to be greatly increased as compared with the controls of the same agewithout brain disease.Animal experiment was also conducted on 15 sucking BALB/c miceby I.P.inoculation of 100 LD<sub>50</sub>（0.05ml）of strain Chen of hemorrhagic fever virus,andon 15 mice without inoculation as controls.No lipofuscin was detected in the controls.However,in the brains of experimental mice,lipofuscin was found to be markedly in-creased,especially in the necrotic cells.The findings suggest that the over-productionand deposition of lipofuscin may be a mild change caused by the virus and its related fac-tors,which might be enhanced by hypotension and shock.展开更多
【目的】以3种不同方法构建BALB/c裸鼠BEL-7402人肝癌模型,并观察BALB/c裸鼠肿瘤生长情况。【方法】将51只BALB/c裸鼠分为A、B、C 3组,每组17只。A组动物皮下注射0.2 m L BEL-7402人肝癌细胞,B组动物于肝脏原位注射0.05 mL BEL-7402人...【目的】以3种不同方法构建BALB/c裸鼠BEL-7402人肝癌模型,并观察BALB/c裸鼠肿瘤生长情况。【方法】将51只BALB/c裸鼠分为A、B、C 3组,每组17只。A组动物皮下注射0.2 m L BEL-7402人肝癌细胞,B组动物于肝脏原位注射0.05 mL BEL-7402人肝癌细胞与Matrigel Matrix的混合物,C组动物于肝脏原位接种BEL-7402人肝癌细胞瘤块组织。从接种后第2周至第5周,每周测定裸鼠体质量,且每组随机取3只动物解剖取肿瘤测量其大小和质量。第5周后,观察记录各组剩余动物(每组5只)的一般状态和存活天数。采用苏木素—伊红(HE)染色观察肿瘤组织病理学变化。【结果】A、B、C 3组实验动物成瘤率均为100%。5周后,A、B、C 3组剩余动物存活天数分别为(90.8±10.2)、(75.6±14.0)、(67.4±11.1) d。解剖所取肿瘤呈结节状,组织病理学检查可见肿瘤细胞呈一定方向排列,细胞呈梭形、多边形,异型明显,可见核分裂。【结论】本实验所采用的3种不同方法均能成功建立BALB/c裸鼠BEL-7402人肝癌模型。展开更多
基金the National Natural Science Foundation of China,No.39270305
文摘INTRODUCTIONIt has been well known that MNNG is one of thestrong and multipotential carcinogens that havebeen frequently reported inducing malignant peptictumors.We have successfully induced rat and doggastric adenocarcinomas,squamous cell carcinomasof rat forestomach and gastric leiomyosarcoma
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.
基金Project was supported by the National Natural Science Foundation of China No.38 970 335
文摘We have previously shown that the lipofuscin in the brain seems to have in-creased in amount in autopsy cases of epidemic hemorrhagic fever.The purpose of thisstudy was to testify if there is really such an increase.Lipfuscin in 10 sections from everybrain of 10 autopsy cases,stained with Sudan Ⅳ,Sudan black and H.E.,was carefully es-timated and found to be greatly increased as compared with the controls of the same agewithout brain disease.Animal experiment was also conducted on 15 sucking BALB/c miceby I.P.inoculation of 100 LD<sub>50</sub>（0.05ml）of strain Chen of hemorrhagic fever virus,andon 15 mice without inoculation as controls.No lipofuscin was detected in the controls.However,in the brains of experimental mice,lipofuscin was found to be markedly in-creased,especially in the necrotic cells.The findings suggest that the over-productionand deposition of lipofuscin may be a mild change caused by the virus and its related fac-tors,which might be enhanced by hypotension and shock.
文摘【目的】以3种不同方法构建BALB/c裸鼠BEL-7402人肝癌模型,并观察BALB/c裸鼠肿瘤生长情况。【方法】将51只BALB/c裸鼠分为A、B、C 3组,每组17只。A组动物皮下注射0.2 m L BEL-7402人肝癌细胞,B组动物于肝脏原位注射0.05 mL BEL-7402人肝癌细胞与Matrigel Matrix的混合物,C组动物于肝脏原位接种BEL-7402人肝癌细胞瘤块组织。从接种后第2周至第5周,每周测定裸鼠体质量,且每组随机取3只动物解剖取肿瘤测量其大小和质量。第5周后,观察记录各组剩余动物(每组5只)的一般状态和存活天数。采用苏木素—伊红(HE)染色观察肿瘤组织病理学变化。【结果】A、B、C 3组实验动物成瘤率均为100%。5周后,A、B、C 3组剩余动物存活天数分别为(90.8±10.2)、(75.6±14.0)、(67.4±11.1) d。解剖所取肿瘤呈结节状,组织病理学检查可见肿瘤细胞呈一定方向排列,细胞呈梭形、多边形,异型明显,可见核分裂。【结论】本实验所采用的3种不同方法均能成功建立BALB/c裸鼠BEL-7402人肝癌模型。
