A human primary gastric cancer tissue (adenocarcinoma Ⅱ—Ⅲ) was transplanted into nude mice (SWISS/DF, nu/nu). It has been transfered for 8 generations at 56 sites in 28 nude mice with transplanting rate of 100%...A human primary gastric cancer tissue (adenocarcinoma Ⅱ—Ⅲ) was transplanted into nude mice (SWISS/DF, nu/nu). It has been transfered for 8 generations at 56 sites in 28 nude mice with transplanting rate of 100%. The transplanted tumor is designated as transplanted human primary gastric cancer-1 in nude mice (THPGC-1). The growth rate of THPGC-1 is rather rapid and the size of transplanted tumor reaches 1cm<sup>2</sup> in 4—5 weeks after transfer. The morphology and histochemistry of the original tumor were retained well in the initial and serial transplanted tumors. THPGC-1 could secrete carcinoembryonic antigen (CEA). After intravenous or intraperitoneal injection of <sup>131</sup>Ⅰ-antiCEA monoclonal antibody into the THPGC-1 bearing nude mice, the radiolabeled antibody was concentrated and localized in the tumor as shown by γ-camera analysis. Similar pattern of lactate dehydrogenase isoenzyme was observed both in primary gastric cancer tissue and THPGC-1 tissue. Chromosomal examination revealed that THPGC-1 was human aneuploid ones. Southern blot analysis showed that the pattern of repetitive DNA bands and the structure of 28S rDNA, c-H-ras and c-myc genes in THPGC-1 were identical to the original primary gastric cancer DNA. The results suggest that THPGC-1 be a reliable model for the research of the molecular biology of cancer cells and experimantal gastric cancer diagnosis and treatment.展开更多
Objective:This study has investigated the existence of label-retaining cell and its distribution in gastric cancer,in the hope that this information will assist investigations on gastric cancer stem cells.Methods:The ...Objective:This study has investigated the existence of label-retaining cell and its distribution in gastric cancer,in the hope that this information will assist investigations on gastric cancer stem cells.Methods:The gastric carcinoma cell line BGC-823 was labeled with BrdU in vitro and then engrafted into the right axilla of nude mice,which developed tumors.Label-retaining cells were quantified by immunohistochemical methods.Results:BrdU positive cells constituted about 96%of the cells in xenograft tumors after 10 days.Subsequently,BrdU positive cells gradually decreased,at the 80th day,labelretaining cells steadily occupied about 0.5%.This set of population cell localized in the margin of cancer nests,which had no difference in cellular morpha.Conclusion:The study demonstrates the presence of label-retaining cells in human gastric cancer xenografts in nude mice and the label-retaining cells may be related with cancer stem cells,which are most likely the cause for spread,metastasis and recurrence.展开更多
AIM: To investigate the effects of integrin-linked kinase (ILK) on gastric cancer cells both in vitro and in vivo. METHODS: ILK small interfering RNA (siRNA) was transfected into human gastric cancer BGC-823 cel...AIM: To investigate the effects of integrin-linked kinase (ILK) on gastric cancer cells both in vitro and in vivo. METHODS: ILK small interfering RNA (siRNA) was transfected into human gastric cancer BGC-823 cells and ILK expression was monitored by real-time quan- titative polymerase chain reaction, Western blotting analysis and immunocytochemistry. Cell attachment, proliferation, invasion, microfilament dynamics and the secretion of vascular endothelial growth factor (VEGF) were also measured. Gastric cancer cells treated with ILK siRNA were subcutaneously transplanted into nude mice and tumor growth was assessed. RESULTS: Both ILK mRNA and protein levels were significantly down-regulated by ILK siRNA in human gastric cancer cells. This significantly inhibited cell attachment, proliferation and invasion. The knockdown of ILK also disturbed F-actin assembly and reduced VEGF secretion in conditioned medium by 40% (P 〈 0.05). Four weeks after injection of ILK siRNA-transfected gastric cancer cells into nude mice, tumor volume and weight were significantly reduced compared with that of tumors induced by cells treated with non-silencing siRNA or by untreated cells (P 〈 0.05). CONCLUSION: Targeting ILK with siRNA suppresses the growth of gastric cancer cells both in v/tro and /n vivo. ILK plays an important role in gastric cancer progression.展开更多
Objective: Human induced pluripotent stem(i PS) cells exhibit great potential for generating functional human cells for medical therapies. In this paper, we report for use of human i PS cells labeled with fluorescent ...Objective: Human induced pluripotent stem(i PS) cells exhibit great potential for generating functional human cells for medical therapies. In this paper, we report for use of human i PS cells labeled with fluorescent magnetic nanoparticles(FMNPs) for targeted imaging and synergistic therapy of gastric cancer cells in vivo. Methods: Human i PS cells were prepared and cultured for 72 h. The culture medium was collected, and then was coincubated with MGC803 cells. Cell viability was analyzed by the MTT method. FMNP-labeled human i PS cells were prepared and injected into gastric cancer-bearing nude mice. The mouse model was observed using a small-animal imaging system. The nude mice were irradiated under an external alternating magnetic field and evaluated using an infrared thermal mapping instrument. Tumor sizes were measured weekly. Results: iP S cells and the collected culture medium inhibited the growth of MGC803 cells. FMNP-labeled human iP S cells targeted and imaged gastric cancer cells in vivo, as well as inhibited cancer growth in vivo through the external magnetic field. Conclusion: FMNP-labeled human i PS cells exhibit considerable potential in applications such as targeted dual-mode imaging and synergistic therapy for early gastric cancer.展开更多
目的观察莪术醇联合氟尿嘧啶对胃癌裸鼠皮下移植瘤的影响。方法将人胃癌细胞株BGC823接种于裸鼠皮下建立荷瘤裸鼠模型。将荷瘤裸鼠随机分为对照组、莪术醇组、氟尿嘧啶组、联合用药组(莪术醇联合氟尿嘧啶),记录各组的肿瘤体积和瘤重。...目的观察莪术醇联合氟尿嘧啶对胃癌裸鼠皮下移植瘤的影响。方法将人胃癌细胞株BGC823接种于裸鼠皮下建立荷瘤裸鼠模型。将荷瘤裸鼠随机分为对照组、莪术醇组、氟尿嘧啶组、联合用药组(莪术醇联合氟尿嘧啶),记录各组的肿瘤体积和瘤重。应用荧光定量聚合酶链反应(q PCR)和免疫组织化学法检测各组肿瘤组织中增殖细胞核抗原(PCNA)、P27的表达。结果对照组肿瘤体积和重量比其他3组升高(P<0.05);联合用药组肿瘤体积和重量低于莪术醇组(P<0.05);联合用药组肿瘤体积和重量与氟尿嘧啶组比较,差异无统计学意义(P>0.05)。各实验组肿瘤组织中PCNA的表达均低于对照组(P<0.05);与莪术醇组和氟尿嘧啶组比较,联合用药组PCNA的表达降低(P<0.05)。各实验组移植瘤组织中P27的表达均高于对照组(P<0.05);与莪术醇组比较,联合用药组P27的表达增强(P<0.05);与氟尿嘧啶组比较,联合用药组P27 m RNA的相对表达有升高趋势,但差异无统计学意义(P>0.05)。与莪术醇组和氟尿嘧啶组比较,联合用药组P27蛋白阳性率升高(P<0.05)。结论莪术醇联合氟尿嘧啶能抑制胃癌裸鼠皮下移植瘤的生长,其机制可能与调节PCNA、P27基因有关。展开更多
文摘A human primary gastric cancer tissue (adenocarcinoma Ⅱ—Ⅲ) was transplanted into nude mice (SWISS/DF, nu/nu). It has been transfered for 8 generations at 56 sites in 28 nude mice with transplanting rate of 100%. The transplanted tumor is designated as transplanted human primary gastric cancer-1 in nude mice (THPGC-1). The growth rate of THPGC-1 is rather rapid and the size of transplanted tumor reaches 1cm<sup>2</sup> in 4—5 weeks after transfer. The morphology and histochemistry of the original tumor were retained well in the initial and serial transplanted tumors. THPGC-1 could secrete carcinoembryonic antigen (CEA). After intravenous or intraperitoneal injection of <sup>131</sup>Ⅰ-antiCEA monoclonal antibody into the THPGC-1 bearing nude mice, the radiolabeled antibody was concentrated and localized in the tumor as shown by γ-camera analysis. Similar pattern of lactate dehydrogenase isoenzyme was observed both in primary gastric cancer tissue and THPGC-1 tissue. Chromosomal examination revealed that THPGC-1 was human aneuploid ones. Southern blot analysis showed that the pattern of repetitive DNA bands and the structure of 28S rDNA, c-H-ras and c-myc genes in THPGC-1 were identical to the original primary gastric cancer DNA. The results suggest that THPGC-1 be a reliable model for the research of the molecular biology of cancer cells and experimantal gastric cancer diagnosis and treatment.
基金Supported by a grant from the Youth Foundation of Jining Medical University(No.JYQ2011KM014)
文摘Objective:This study has investigated the existence of label-retaining cell and its distribution in gastric cancer,in the hope that this information will assist investigations on gastric cancer stem cells.Methods:The gastric carcinoma cell line BGC-823 was labeled with BrdU in vitro and then engrafted into the right axilla of nude mice,which developed tumors.Label-retaining cells were quantified by immunohistochemical methods.Results:BrdU positive cells constituted about 96%of the cells in xenograft tumors after 10 days.Subsequently,BrdU positive cells gradually decreased,at the 80th day,labelretaining cells steadily occupied about 0.5%.This set of population cell localized in the margin of cancer nests,which had no difference in cellular morpha.Conclusion:The study demonstrates the presence of label-retaining cells in human gastric cancer xenografts in nude mice and the label-retaining cells may be related with cancer stem cells,which are most likely the cause for spread,metastasis and recurrence.
基金Supported by The grants from the Department of Anesthesiology and Intensive Care of Changhai Hospital,Shanghai,China
文摘AIM: To investigate the effects of integrin-linked kinase (ILK) on gastric cancer cells both in vitro and in vivo. METHODS: ILK small interfering RNA (siRNA) was transfected into human gastric cancer BGC-823 cells and ILK expression was monitored by real-time quan- titative polymerase chain reaction, Western blotting analysis and immunocytochemistry. Cell attachment, proliferation, invasion, microfilament dynamics and the secretion of vascular endothelial growth factor (VEGF) were also measured. Gastric cancer cells treated with ILK siRNA were subcutaneously transplanted into nude mice and tumor growth was assessed. RESULTS: Both ILK mRNA and protein levels were significantly down-regulated by ILK siRNA in human gastric cancer cells. This significantly inhibited cell attachment, proliferation and invasion. The knockdown of ILK also disturbed F-actin assembly and reduced VEGF secretion in conditioned medium by 40% (P 〈 0.05). Four weeks after injection of ILK siRNA-transfected gastric cancer cells into nude mice, tumor volume and weight were significantly reduced compared with that of tumors induced by cells treated with non-silencing siRNA or by untreated cells (P 〈 0.05). CONCLUSION: Targeting ILK with siRNA suppresses the growth of gastric cancer cells both in v/tro and /n vivo. ILK plays an important role in gastric cancer progression.
基金supported by National Natural Science Foundation of China (Grant No. 81225010, 20803040, 81028009, and 31170961)National Key Basic Research Program of China (973 Program) (Grant No. 2010CB933902 and 2015CB931802)+1 种基金National Key Technology Research and Development Program (863 Program) (Grant No. 2012AA022703 and 2014AA020700)Shanghai Science and Technology Fund (Grant No.13NM1401500)
文摘Objective: Human induced pluripotent stem(i PS) cells exhibit great potential for generating functional human cells for medical therapies. In this paper, we report for use of human i PS cells labeled with fluorescent magnetic nanoparticles(FMNPs) for targeted imaging and synergistic therapy of gastric cancer cells in vivo. Methods: Human i PS cells were prepared and cultured for 72 h. The culture medium was collected, and then was coincubated with MGC803 cells. Cell viability was analyzed by the MTT method. FMNP-labeled human i PS cells were prepared and injected into gastric cancer-bearing nude mice. The mouse model was observed using a small-animal imaging system. The nude mice were irradiated under an external alternating magnetic field and evaluated using an infrared thermal mapping instrument. Tumor sizes were measured weekly. Results: iP S cells and the collected culture medium inhibited the growth of MGC803 cells. FMNP-labeled human iP S cells targeted and imaged gastric cancer cells in vivo, as well as inhibited cancer growth in vivo through the external magnetic field. Conclusion: FMNP-labeled human i PS cells exhibit considerable potential in applications such as targeted dual-mode imaging and synergistic therapy for early gastric cancer.
文摘目的观察莪术醇联合氟尿嘧啶对胃癌裸鼠皮下移植瘤的影响。方法将人胃癌细胞株BGC823接种于裸鼠皮下建立荷瘤裸鼠模型。将荷瘤裸鼠随机分为对照组、莪术醇组、氟尿嘧啶组、联合用药组(莪术醇联合氟尿嘧啶),记录各组的肿瘤体积和瘤重。应用荧光定量聚合酶链反应(q PCR)和免疫组织化学法检测各组肿瘤组织中增殖细胞核抗原(PCNA)、P27的表达。结果对照组肿瘤体积和重量比其他3组升高(P<0.05);联合用药组肿瘤体积和重量低于莪术醇组(P<0.05);联合用药组肿瘤体积和重量与氟尿嘧啶组比较,差异无统计学意义(P>0.05)。各实验组肿瘤组织中PCNA的表达均低于对照组(P<0.05);与莪术醇组和氟尿嘧啶组比较,联合用药组PCNA的表达降低(P<0.05)。各实验组移植瘤组织中P27的表达均高于对照组(P<0.05);与莪术醇组比较,联合用药组P27的表达增强(P<0.05);与氟尿嘧啶组比较,联合用药组P27 m RNA的相对表达有升高趋势,但差异无统计学意义(P>0.05)。与莪术醇组和氟尿嘧啶组比较,联合用药组P27蛋白阳性率升高(P<0.05)。结论莪术醇联合氟尿嘧啶能抑制胃癌裸鼠皮下移植瘤的生长,其机制可能与调节PCNA、P27基因有关。