AIM: To investigate the role of TR3 in induction of apoptosis in gastric cancer cells. METHODS: Human gastric cancer cell line, MGC80-3, was used. Expression of TR3 mRNA and its protein was detected by Northern blot a...AIM: To investigate the role of TR3 in induction of apoptosis in gastric cancer cells. METHODS: Human gastric cancer cell line, MGC80-3, was used. Expression of TR3 mRNA and its protein was detected by Northern blot and Western blot. Localization of TR3 protein was showed by immunofluorescence analysis under laser-scanning confocal microscope. Apoptotic morphology was observed by DAPI fluorescence staining, and apoptotic index was counted among 1000 cells randomly. Stable transfection assay was carried out by Lipofectamine. RESULTS: Treatment of MGC80-3 cells with TPA and VP-16 resulted in apoptosis, accompanied by the repression of Bcl-2 protein in a time-dependent manner. At the same time, TPA and VP-16 also up-regulated expression level of TR3 mRNA in MGC80-3 cells that expressed TR3 mRNA. When antisense-TR3 expression vector was transfected into the cells, expression of TR3 protein was repressed. In this case, TPA and VP-16 did not induce apoptosis. In addition, TPA and VP-16-induced apoptosis involved in translocation of TR3. In MGC80-3 cells, TR3 localized concentrative in nucleus, after treatment of cells with TPA and VP-16, TR3 translocated from nucleus to cytosol obviously. However, when this nuclear translocation was blocked by LMB, apoptosis was not occurred in MGC80-3 cells even in the presence of TPA and VP-16. CONCLUSION: Induction of apoptosis by TPA and VP-16 is through induction of TR3 expression and translocation of TR3 from nucleus to cytosol, which may be a novel signal pathway for TR3, and represent the new biological function of TR3 to exert its effect on apoptosis in gastric cancer cells.展开更多
程序性细胞死亡因子5(programmed celldeath5,PDCD5)在多种肿瘤细胞中表达明显降低。携带pdcd5基因的靶向增殖型腺病毒SG611-pdcd5对白血病细胞具有杀伤作用,对正常细胞具有相对保护作用。本研究旨在观察联合应用SG611-pdcd5与低剂量化...程序性细胞死亡因子5(programmed celldeath5,PDCD5)在多种肿瘤细胞中表达明显降低。携带pdcd5基因的靶向增殖型腺病毒SG611-pdcd5对白血病细胞具有杀伤作用,对正常细胞具有相对保护作用。本研究旨在观察联合应用SG611-pdcd5与低剂量化疗药物依托泊甙(etoposide,VP-16)对白血病细胞系K562的作用。以不同浓度梯度的药物或不同感染复数(multiplicity of infection,MOI)的病毒液作用于K562细胞,培养48小时后用MTT法检测细胞存活率。结果表明,与SG611-pdcd5(MOI=40)或VP-16(0.5μg/ml)单独作用组相比,SG611-pdcd5(MOI=40)+VP-16(0.5μg/ml)组细胞存活率明显降低(p均<0.05),分别为(59.45±4.12)%、(82.91±3.41)%及(42.00±5.75)%。SG611-pdcd5与VP-16的协同作用强于PDCD5蛋白或携带pdcd5基因的非增殖型腺病毒Ad-pdcd5与VP-16的协同作用(p均<0.05);VP-16浓度为4.0μg/ml时,VP-16+SG611-pdcd5(MOI=40)组、VP-16+proPDCD5(40μg/ml)组及VP-16+Ad-pdcd5(MOI=80)组细胞存活率分别为(37.09±1.89)%、(52.36±1.64)%及(73.64±4.33)%。结论:SG611-pdcd5具有促进低剂量VP-16杀伤K562细胞的作用,二者联合可增强对白血病细胞的杀伤作用。展开更多
基金the National Outstanding Youth Science foundation of China (B type,39825502)the National Natural Science Foundation of China (39880015,30170477)the Natural Science Foundation of Fujian Province (C0110004).
文摘AIM: To investigate the role of TR3 in induction of apoptosis in gastric cancer cells. METHODS: Human gastric cancer cell line, MGC80-3, was used. Expression of TR3 mRNA and its protein was detected by Northern blot and Western blot. Localization of TR3 protein was showed by immunofluorescence analysis under laser-scanning confocal microscope. Apoptotic morphology was observed by DAPI fluorescence staining, and apoptotic index was counted among 1000 cells randomly. Stable transfection assay was carried out by Lipofectamine. RESULTS: Treatment of MGC80-3 cells with TPA and VP-16 resulted in apoptosis, accompanied by the repression of Bcl-2 protein in a time-dependent manner. At the same time, TPA and VP-16 also up-regulated expression level of TR3 mRNA in MGC80-3 cells that expressed TR3 mRNA. When antisense-TR3 expression vector was transfected into the cells, expression of TR3 protein was repressed. In this case, TPA and VP-16 did not induce apoptosis. In addition, TPA and VP-16-induced apoptosis involved in translocation of TR3. In MGC80-3 cells, TR3 localized concentrative in nucleus, after treatment of cells with TPA and VP-16, TR3 translocated from nucleus to cytosol obviously. However, when this nuclear translocation was blocked by LMB, apoptosis was not occurred in MGC80-3 cells even in the presence of TPA and VP-16. CONCLUSION: Induction of apoptosis by TPA and VP-16 is through induction of TR3 expression and translocation of TR3 from nucleus to cytosol, which may be a novel signal pathway for TR3, and represent the new biological function of TR3 to exert its effect on apoptosis in gastric cancer cells.
文摘程序性细胞死亡因子5(programmed celldeath5,PDCD5)在多种肿瘤细胞中表达明显降低。携带pdcd5基因的靶向增殖型腺病毒SG611-pdcd5对白血病细胞具有杀伤作用,对正常细胞具有相对保护作用。本研究旨在观察联合应用SG611-pdcd5与低剂量化疗药物依托泊甙(etoposide,VP-16)对白血病细胞系K562的作用。以不同浓度梯度的药物或不同感染复数(multiplicity of infection,MOI)的病毒液作用于K562细胞,培养48小时后用MTT法检测细胞存活率。结果表明,与SG611-pdcd5(MOI=40)或VP-16(0.5μg/ml)单独作用组相比,SG611-pdcd5(MOI=40)+VP-16(0.5μg/ml)组细胞存活率明显降低(p均<0.05),分别为(59.45±4.12)%、(82.91±3.41)%及(42.00±5.75)%。SG611-pdcd5与VP-16的协同作用强于PDCD5蛋白或携带pdcd5基因的非增殖型腺病毒Ad-pdcd5与VP-16的协同作用(p均<0.05);VP-16浓度为4.0μg/ml时,VP-16+SG611-pdcd5(MOI=40)组、VP-16+proPDCD5(40μg/ml)组及VP-16+Ad-pdcd5(MOI=80)组细胞存活率分别为(37.09±1.89)%、(52.36±1.64)%及(73.64±4.33)%。结论:SG611-pdcd5具有促进低剂量VP-16杀伤K562细胞的作用,二者联合可增强对白血病细胞的杀伤作用。
