溶瘤Ⅱ型单纯疱疹病毒oHSV2是对Ⅱ型单纯疱疹病毒HSV-2进行基因改造后得到的新型溶瘤病毒。UL19基因编码的VP5蛋白为oHSV2主要衣壳蛋白之一。在前期已经通过GST pull-down与质谱检测分析确定了oHSV2的VP5蛋白为人类白细胞抗原E(HLA-E)...溶瘤Ⅱ型单纯疱疹病毒oHSV2是对Ⅱ型单纯疱疹病毒HSV-2进行基因改造后得到的新型溶瘤病毒。UL19基因编码的VP5蛋白为oHSV2主要衣壳蛋白之一。在前期已经通过GST pull-down与质谱检测分析确定了oHSV2的VP5蛋白为人类白细胞抗原E(HLA-E)的相互作用蛋白的基础上,将HLA-E作为NK与CTL等免疫细胞表面CD94/NKG2A的强效抑制性配体,当它与CD94/NKG2A结合后,NK与CTL细胞的免疫功能会受到一定程度的抑制。前期研究已证实oHSV2会在体外上调部分肿瘤细胞系表面HLA-E表达,为探究oHSV2是否通过VP5蛋白上调肿瘤细胞系表面HLA-E的表达,进而影响HLA-E和CD94/NKG2A的结合,最终改变NK细胞的抗肿瘤能力,通过PiggyBac转座系统构建稳定表达VP5蛋白的人胃腺癌细胞BGC823-VP5细胞系。所构建的细胞系经流式检测单克隆细胞阳性率在99%以上;Western Blot检测到VP5蛋白在细胞内表达;实时无标记动态细胞分析技术(RTCA Real Time Cell AnaIysis)检测表明BGC823-VP5细胞系与亲本细胞BGC823细胞生长活性一致。稳定表达VP5蛋白的人胃癌细胞BGC823-VP5细胞系的构建,为进一步研究oHSV2上VP5蛋白在人胃癌BGC823细胞内影响HLA-E的表达,进而影响免疫细胞的抗肿瘤能力奠定了基础。展开更多
AIM:To develop orthotopic gastric cancer mouse models from different cell lines and characterize the tumor features to assist further in preclinical trials and clinical treatment strategies.METHODS:Human gastric cance...AIM:To develop orthotopic gastric cancer mouse models from different cell lines and characterize the tumor features to assist further in preclinical trials and clinical treatment strategies.METHODS:Human gastric cancer SGC-7901 and BGC823 cell suspensions were injected subcutaneously into nude mice to develop solid tumors,and tumor tissue pieces were then implanted under the serous coat of the stomach.An autopsy was performed on all animals of the SGC-7901 and BGC-823 models to observe the primary tumor growth and metastases using pathological and immunohistochemical methods.RESULTS:Both models showed large tumors in situ resulting in pressure and infiltration of the adjacent organs.The gastric cavity became smaller,along with stenosis of the cardia or pylorus.There were biological and statistical differences between the two models.The metastasis rate in involved organs (lymph nodes,kidney,spleen,testis) was significantly higher in the BGC-823 model compared to the SGC-7901 model (P < 0.05 or P < 0.01).The median survival of the BGC-823 model was shorter than that of SGC-7901 (23 d vs 84 d,P < 0.05).Histopathologically,the primary tumor and metastatic lesions of the two models showed obvious atypia and mucus in the cytoplasm.Compared with the SGC-7901 model,BGC-823 appeared more poorly differentiated (absence of adenoid structure),had a smaller volume,and richer capillary structure.Immunohistochemical staining revealed cytokeratin 20 and epithelial membrane antigen expression was positive in the SGC-7901 tumors,while negative in BGC-823 ones.CONCLUSION:Models using the SGC-7901 and BGC-823 cell lines were established which could function in gastric cancer research on carcinogenesis mechanism and drug discovery.The two models showed different tumor behavior and the latter was more malignant than the former.展开更多
文摘溶瘤Ⅱ型单纯疱疹病毒oHSV2是对Ⅱ型单纯疱疹病毒HSV-2进行基因改造后得到的新型溶瘤病毒。UL19基因编码的VP5蛋白为oHSV2主要衣壳蛋白之一。在前期已经通过GST pull-down与质谱检测分析确定了oHSV2的VP5蛋白为人类白细胞抗原E(HLA-E)的相互作用蛋白的基础上,将HLA-E作为NK与CTL等免疫细胞表面CD94/NKG2A的强效抑制性配体,当它与CD94/NKG2A结合后,NK与CTL细胞的免疫功能会受到一定程度的抑制。前期研究已证实oHSV2会在体外上调部分肿瘤细胞系表面HLA-E表达,为探究oHSV2是否通过VP5蛋白上调肿瘤细胞系表面HLA-E的表达,进而影响HLA-E和CD94/NKG2A的结合,最终改变NK细胞的抗肿瘤能力,通过PiggyBac转座系统构建稳定表达VP5蛋白的人胃腺癌细胞BGC823-VP5细胞系。所构建的细胞系经流式检测单克隆细胞阳性率在99%以上;Western Blot检测到VP5蛋白在细胞内表达;实时无标记动态细胞分析技术(RTCA Real Time Cell AnaIysis)检测表明BGC823-VP5细胞系与亲本细胞BGC823细胞生长活性一致。稳定表达VP5蛋白的人胃癌细胞BGC823-VP5细胞系的构建,为进一步研究oHSV2上VP5蛋白在人胃癌BGC823细胞内影响HLA-E的表达,进而影响免疫细胞的抗肿瘤能力奠定了基础。
基金Supported by A grant from the Natural Science Foundation of China,No.30830040
文摘AIM:To develop orthotopic gastric cancer mouse models from different cell lines and characterize the tumor features to assist further in preclinical trials and clinical treatment strategies.METHODS:Human gastric cancer SGC-7901 and BGC823 cell suspensions were injected subcutaneously into nude mice to develop solid tumors,and tumor tissue pieces were then implanted under the serous coat of the stomach.An autopsy was performed on all animals of the SGC-7901 and BGC-823 models to observe the primary tumor growth and metastases using pathological and immunohistochemical methods.RESULTS:Both models showed large tumors in situ resulting in pressure and infiltration of the adjacent organs.The gastric cavity became smaller,along with stenosis of the cardia or pylorus.There were biological and statistical differences between the two models.The metastasis rate in involved organs (lymph nodes,kidney,spleen,testis) was significantly higher in the BGC-823 model compared to the SGC-7901 model (P < 0.05 or P < 0.01).The median survival of the BGC-823 model was shorter than that of SGC-7901 (23 d vs 84 d,P < 0.05).Histopathologically,the primary tumor and metastatic lesions of the two models showed obvious atypia and mucus in the cytoplasm.Compared with the SGC-7901 model,BGC-823 appeared more poorly differentiated (absence of adenoid structure),had a smaller volume,and richer capillary structure.Immunohistochemical staining revealed cytokeratin 20 and epithelial membrane antigen expression was positive in the SGC-7901 tumors,while negative in BGC-823 ones.CONCLUSION:Models using the SGC-7901 and BGC-823 cell lines were established which could function in gastric cancer research on carcinogenesis mechanism and drug discovery.The two models showed different tumor behavior and the latter was more malignant than the former.
