Objective：There has been an increasing interest in recent years in the role of stem cells.With an extensive understanding of their biology,a major role for stem cells in the malignant process has been proposed and th...Objective：There has been an increasing interest in recent years in the role of stem cells.With an extensive understanding of their biology,a major role for stem cells in the malignant process has been proposed and the existence of cancer stem cells（CSCs） has been confirmed in hematopoietic malignancies and solid organ malignancies including brain cancer,breast,prostate,colon,and pancreatic cancer.Lung cancer is the leading cause of cancer mortality in most large cities of China.It is possible that lung cancer contains cancer stem cells responsible for its malignancy.The aim of this study is to identify,characterize and enrich the CSC population that drives and maintains lung adenocarcinoma growth and metastasis.Methods：Side population（SP） cell analysis and sorting were applied on human lung adenocarcinoma cell line and an attempt to further enrich them by preliminary serum-free culture before fluorescence activated cell sorting（FACS） was done.Stem cell properties of SP cells were evaluated by their proliferative index,colony-forming efficiency,tumorigenic potential,bi-differentiation capacity and the expression of common stem cell surface markers.Results：Lung cancer cells could grow in a serum-free Medium（SFM） as non-adherent spheres similar to neurospheres or mammospheres.The proportion of SP cells in cell spheres was significantly higher than that in cells grown as monolayers.SP cells had a greater proliferative index,a higher colony-forming efficiency and a greater ability to form tumor in vivo.SP cells were both CCA positive and SP-C positive while non-SP cells were only SP-C positive.Flow cytometric analysis of cell phenotype showed that SP cells expressed CD133 and CD44,the common cell surface markers of cancer stem cells,while non-SP cells only expressed CD44.Conclusion：SP cells existed in human lung adenocarcinoma cell lines and they could be further enriched by preliminary serum-free culture before FACS sorting.SP cells possessed the properties of cancer stem cells.展开更多
Objective The toxicology of TCDD （2,3,7,8-tetrachlorodibenzo-p-dioxin） has been studied mainly with regard to the carcinogenicity of its metabolites, but its phototoxicity is not well understood. Although some studi...Objective The toxicology of TCDD （2,3,7,8-tetrachlorodibenzo-p-dioxin） has been studied mainly with regard to the carcinogenicity of its metabolites, but its phototoxicity is not well understood. Although some studies have indicated the lethal phototoxicity of TCDD, this study was designed to investigate its effect on SPC-Al cells. Methods SPC-Al cells were cultured in 1640 medium and treated with 10 nmol/L, 0.1 μmol/L, 1 μmol/L TCDD for either 24 h or 96 h at each concentration. SPC-Al cells were co-cultured with TCDD at different concentrations. Then the cell morphology, DNA fragment electrophoresis, and cell cycle were analyzed by flow cytometry, and enzyme assays were used to observe the effect of TCDD on the morphology, growth rate, and enxyme change of SPC-A1 cells. Results With the increasing concentrations of TCDD and prolongation of culture time, the morphology of SPC-Alcells was changed from round shape to spindle, and the ability of SPC-Al cells to adhere to wall was decreased. With debris emitted around the cells, the morphologic changes included reduction in cell volume. Nuclear ehromatin condensation and PI were observed. With the increasing concentrations of TCDD, DNA ladder occurred. After treatment with TCDD, extraction of cancer cells exhibited typical DNA fragmentation, and flow eytometry analysis showed apoptosis in a dose-dependent manner. As the concentration of TCDD rose from 10 nmol/L to 1 μmol/L, the ratio of apoptotic cells increased from 10.76% to 21.82%. Conclusions TCDD has in vitro cytotoxicity on SPC-Al cells, and the cytotoxicity is positively related to its concentration and culture time. TCDD may inhibit the growth and proliferation of SPC-A lcells through the pathway of apoptosis introduction.展开更多
目的探讨花边莲提取液对人肺癌SPC-A-1细胞凋亡相关基因survivin和caspase-3表达的影响。方法采用体外培养人肺癌SPC-A-1细胞,实验随机分为正常对照组、花边莲处理组(浓度分别为12.5,25和50 m l/L)和顺铂(DDp25mg/L)组,半定量RT-PCR检测...目的探讨花边莲提取液对人肺癌SPC-A-1细胞凋亡相关基因survivin和caspase-3表达的影响。方法采用体外培养人肺癌SPC-A-1细胞,实验随机分为正常对照组、花边莲处理组(浓度分别为12.5,25和50 m l/L)和顺铂(DDp25mg/L)组,半定量RT-PCR检测survivin和caspase-3 mRNA表达水平,二步法免疫组化检测Survivin和Caspase-3蛋白表达变化。结果与正常对照组相比,花边莲各浓度组caspase-3 mRNA和蛋白表达显著上升(P<0.01),survivin mRNA和蛋白表达明显下降(P<0.01)。结论花边莲提取液诱导SPC-A-1细胞凋亡的分子机理可能与上调caspase-3基因表达和下调survivin基因表达有关。展开更多
目的:研究腺病毒介导的肿瘤生长抑制因子4(inhibitor of growth family 4,ING4)联合放疗对肺腺癌SPC-A1细胞移植瘤生长的抑制作用。方法:制备SPC-A1细胞荷瘤小鼠模型,随机分为PBS组、Ad组、Ad-ING4组、放疗组、Ad-ING4+放疗组。测量各...目的:研究腺病毒介导的肿瘤生长抑制因子4(inhibitor of growth family 4,ING4)联合放疗对肺腺癌SPC-A1细胞移植瘤生长的抑制作用。方法:制备SPC-A1细胞荷瘤小鼠模型,随机分为PBS组、Ad组、Ad-ING4组、放疗组、Ad-ING4+放疗组。测量各组荷瘤小鼠移植瘤的体积变化,治疗15 d后摘取瘤块,称质量并计算抑瘤率;H-E染色观察瘤体组织细胞的形态学变化,免疫组化法检测瘤体组织中Bax、caspase-3、Bcl-2、VEGF等因子的表达。结果:治疗后第15天SPC-A1移植瘤体积:Ad-ING4组为(1 136.03±151.58)mm3、单纯放疗组为(1 035.67±86.27)mm3、Ad-ING4+放疗组为(743.84±109.06)mm3,联合组可有效抑制肿瘤生长(P<0.01);此外,联合组抑瘤率也显著高于单纯Ad-ING4组或放疗组(69.62%vs 33.17%、35.41%,P<0.01),呈现放疗增敏协同作用(Q=1.22)。免疫组化结果显示,Ad-ING4及其联合放疗组能明显上调Bax、caspase-3等蛋白的表达,下调Bcl-2、VEGF等蛋白的表达,且Ad-ING4+放疗组对这些蛋白表达的调节作用强于Ad-ING4组、单纯放疗组(P<0.01)。结论:Ad-ING4联合放疗可有效抑制肺腺癌SPC-A1细胞移植瘤的生长。展开更多
文摘Objective：There has been an increasing interest in recent years in the role of stem cells.With an extensive understanding of their biology,a major role for stem cells in the malignant process has been proposed and the existence of cancer stem cells（CSCs） has been confirmed in hematopoietic malignancies and solid organ malignancies including brain cancer,breast,prostate,colon,and pancreatic cancer.Lung cancer is the leading cause of cancer mortality in most large cities of China.It is possible that lung cancer contains cancer stem cells responsible for its malignancy.The aim of this study is to identify,characterize and enrich the CSC population that drives and maintains lung adenocarcinoma growth and metastasis.Methods：Side population（SP） cell analysis and sorting were applied on human lung adenocarcinoma cell line and an attempt to further enrich them by preliminary serum-free culture before fluorescence activated cell sorting（FACS） was done.Stem cell properties of SP cells were evaluated by their proliferative index,colony-forming efficiency,tumorigenic potential,bi-differentiation capacity and the expression of common stem cell surface markers.Results：Lung cancer cells could grow in a serum-free Medium（SFM） as non-adherent spheres similar to neurospheres or mammospheres.The proportion of SP cells in cell spheres was significantly higher than that in cells grown as monolayers.SP cells had a greater proliferative index,a higher colony-forming efficiency and a greater ability to form tumor in vivo.SP cells were both CCA positive and SP-C positive while non-SP cells were only SP-C positive.Flow cytometric analysis of cell phenotype showed that SP cells expressed CD133 and CD44,the common cell surface markers of cancer stem cells,while non-SP cells only expressed CD44.Conclusion：SP cells existed in human lung adenocarcinoma cell lines and they could be further enriched by preliminary serum-free culture before FACS sorting.SP cells possessed the properties of cancer stem cells.
基金This work was supported by the grant from National Natural Science Foundation of China (20275012).
文摘Objective The toxicology of TCDD （2,3,7,8-tetrachlorodibenzo-p-dioxin） has been studied mainly with regard to the carcinogenicity of its metabolites, but its phototoxicity is not well understood. Although some studies have indicated the lethal phototoxicity of TCDD, this study was designed to investigate its effect on SPC-Al cells. Methods SPC-Al cells were cultured in 1640 medium and treated with 10 nmol/L, 0.1 μmol/L, 1 μmol/L TCDD for either 24 h or 96 h at each concentration. SPC-Al cells were co-cultured with TCDD at different concentrations. Then the cell morphology, DNA fragment electrophoresis, and cell cycle were analyzed by flow cytometry, and enzyme assays were used to observe the effect of TCDD on the morphology, growth rate, and enxyme change of SPC-A1 cells. Results With the increasing concentrations of TCDD and prolongation of culture time, the morphology of SPC-Alcells was changed from round shape to spindle, and the ability of SPC-Al cells to adhere to wall was decreased. With debris emitted around the cells, the morphologic changes included reduction in cell volume. Nuclear ehromatin condensation and PI were observed. With the increasing concentrations of TCDD, DNA ladder occurred. After treatment with TCDD, extraction of cancer cells exhibited typical DNA fragmentation, and flow eytometry analysis showed apoptosis in a dose-dependent manner. As the concentration of TCDD rose from 10 nmol/L to 1 μmol/L, the ratio of apoptotic cells increased from 10.76% to 21.82%. Conclusions TCDD has in vitro cytotoxicity on SPC-Al cells, and the cytotoxicity is positively related to its concentration and culture time. TCDD may inhibit the growth and proliferation of SPC-A lcells through the pathway of apoptosis introduction.
文摘目的:研究腺病毒介导的肿瘤生长抑制因子4(inhibitor of growth family 4,ING4)联合放疗对肺腺癌SPC-A1细胞移植瘤生长的抑制作用。方法:制备SPC-A1细胞荷瘤小鼠模型,随机分为PBS组、Ad组、Ad-ING4组、放疗组、Ad-ING4+放疗组。测量各组荷瘤小鼠移植瘤的体积变化,治疗15 d后摘取瘤块,称质量并计算抑瘤率;H-E染色观察瘤体组织细胞的形态学变化,免疫组化法检测瘤体组织中Bax、caspase-3、Bcl-2、VEGF等因子的表达。结果:治疗后第15天SPC-A1移植瘤体积:Ad-ING4组为(1 136.03±151.58)mm3、单纯放疗组为(1 035.67±86.27)mm3、Ad-ING4+放疗组为(743.84±109.06)mm3,联合组可有效抑制肿瘤生长(P<0.01);此外,联合组抑瘤率也显著高于单纯Ad-ING4组或放疗组(69.62%vs 33.17%、35.41%,P<0.01),呈现放疗增敏协同作用(Q=1.22)。免疫组化结果显示,Ad-ING4及其联合放疗组能明显上调Bax、caspase-3等蛋白的表达,下调Bcl-2、VEGF等蛋白的表达,且Ad-ING4+放疗组对这些蛋白表达的调节作用强于Ad-ING4组、单纯放疗组(P<0.01)。结论:Ad-ING4联合放疗可有效抑制肺腺癌SPC-A1细胞移植瘤的生长。
