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人脑瘤裸小鼠原位移植模型的亲本性探索
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摘要
目的(1)通过改良肿瘤组织移植的方法以获得良好的人脑胶质瘤裸小鼠脑内移植模型。在此基础上,去建立人脑多形性胶质母细胞瘤(glioblastoma multiform,GBM)和人肺腺癌脑转移瘤的裸小鼠模型,并探知其生物学特性能否保持其亲本肿瘤的特性。(2)培育表达绿色荧光蛋白(green fluoresent protein,GFP)的裸小鼠,将其用于人胶质瘤干细胞(human glioma stem cells,HGSCs)移植实验研究,并阐明HGSCs在宿主脑组织中具有播散和融合其它细胞的特征,以用于肿瘤组织重构的研究。
     方法(1)先用SHG-44胶质瘤细胞(1×107)注射于裸小鼠皮下,形成皮下移植瘤,再把皮下移植瘤组织通过自制的组织挤压装置放入24#无菌套管针,并调整肿瘤的体积为2.0mm3,然后把定量要移植的肿瘤组织块植入裸小鼠右尾状核,制作成裸小鼠脑内移植瘤模型。观察移植后裸小鼠生存状态。30d后解剖裸小鼠取脑并行病理切片,观察原位移植瘤的形态、病理学特征和成瘤率。(2)将体外培养高表达表皮生长因子受体(epidermal growth factor receptor,EGFR)的人脑GBM细胞,在立体定向仪辅助下行裸小鼠右尾状核接种;继而将致瘤的组织通过自制的组织挤压装置放入24#无菌套管针,然后将2.0mm3的肿瘤组织经徒手操作接种于裸小鼠右尾状核,致瘤后即用裸小鼠的瘤组织再进行原位传代接种。接种后观察移植瘤的生长特性,并分析EGFR在各代移植瘤中的表达。(3)取人肺腺癌脑转移瘤组织块,通过自制的组织挤压装置放入24#无菌套管针,然后将2.0mm3的肿瘤组织经徒手操作接种于裸小鼠右尾状核。致瘤后即用裸小鼠的瘤组织再进行原位传代接种,然后观察致瘤率及荷瘤鼠生存期;HE染色分析各代移植瘤的组织学形态;MRI观察移植瘤在鼠脑内的大体形态;免疫组化染色观察移植瘤中CEA的表达;Alcian blue/PAS特殊染色检测移植瘤中粘液的性质。(4)将C57BL/6J-GFP转基因小鼠与NC系裸小鼠进行交配,在继代时严格挑选都表达GFP的无毛雄鼠(♂)与有毛雌鼠(♀)交配,通过肉眼和荧光显微镜等方法观察GFP在裸小鼠皮肤和脏器中的表达情况,继将HGSCs原位移植于表达GFP的裸小鼠,以观察移植瘤的生长情况。
     结果(1)通过改良的肿瘤组织块移植后,18只裸小鼠除3只接种当日死亡外,其余15只于移植后30d被处死取脑行冰冻切片,HE染色在光镜下见移植瘤侵袭性生长。致瘤率为93%(14/15)。(2)人GBM移植瘤组织在裸小鼠尾状核已连续传至13代,共130只鼠,荷瘤鼠生存期为19±1.33d。移植瘤病理学符合呈高度侵袭性生长、EGFR过表达的人脑GBM的特征。不同时间测得的肿瘤增殖曲线提示,致瘤的潜伏期短(<3d),持续快速增殖期长(>15d),进入晚期至死亡时间短(<3d)。(3)人肺腺癌脑转移瘤组织在裸小鼠右尾状核已连续传至6代,共65只鼠。荷瘤鼠生存期:原代为47.6±1.8d,2-3代有所缩短,4-6代稳定在38.0±0.9d;移植瘤病理为低分化腺癌,不向周围正常鼠脑组织侵袭;MRI示移植瘤类圆形,瘤周无水肿,与临床病例的MRI一致;移植瘤中癌胚抗原(carcinoembryonic antigen,CEA)表达阳性,并有酸性粘液存在。(4)GFP荧光裸小鼠已传至8代,包括脑在内的全身主要器官和细胞都发绿色荧光。对用于HGSCs原位移植的脑,能清晰辨认出不发光的瘤细胞和发光的宿主细胞。而瘤细胞经抗人类白细胞抗原(human leukocyte antigen,HLA)-Ⅰ抗体偶联红色荧光剂(PE)的免疫组织化学染色后,在共聚焦显微镜下可清晰显示HGSCs与宿主脑细胞的组织学关系是:多数播散,个别的发生细胞与细胞融合。
     结论(1)通过改良的组织定量移植具有操作简便,对小鼠创伤小,速度快,成瘤率高,便于批量制作原位移植裸小鼠模型。(2)人GBM肿瘤组织于鼠尾状核接种比传统的肿瘤细胞悬液接种,非但接种的细胞量大,还能将支持肿瘤细胞增殖的间质等其它成分一并植入,能较好体现临床上呈侵袭生长和过表达EGFR的高度恶性胶质瘤的特征。(3)人肺腺癌脑转移瘤组织块接种于鼠脑内建立的原位移植模型能更好地模拟临床原发肿瘤呈现低分化的病理学特征,并且具有缺乏侵袭性及CEA高表达的生物学特性,说明本方法为研究人肺腺癌脑转移瘤的生物学特性及实验治疗提供了一个可靠的动物模型。(4)用免疫功能健全、表达GFP的转基因鼠与免疫功能缺陷的裸小鼠杂交,可获得脑等组织器官表达GFP的裸小鼠。对其进行HGSCs原位移植,因可清晰辨认移植瘤与宿主组织的关系而有望用于肿瘤组织重构的研究。
PartⅠEstablishment of Orthotopic Grafts of Human Gliomas into Nude Mice
     Objective To improve the methods of human glioma xenotransplanted into the brain of nude mice by tumor tissue injected. Methods SHG-44 glioma cells(1×107) were injected subcutaneouly into nude mice, when the solid tumor formed ,it was sharply dissected.Then the xenografts quantified was passed into the brain of nude mice. 30 days later ,all the mice were sacrificed.Slices of intracerebral tumor transplants was stained with hematein-eosin(HE).We study it’s histologic characteristics under microscope. Results 3 of the 18 orthotopic grafted nude mice was died earlier .30 days after tumor tissue implanted, all the mice were sacrificed. The brian was cut in frozen section,stained with HE. Under microscope, we can see the orthotopic grafts with invasiveness to normal brain tissue.Take tate of the grafts was 93 %( 14/15 ) .Conclusion Tissue quantitative implantation is operation simple, small wound ,which can save time and easily product model in large quantities .
     PartⅡEstablishment of Orthotopic Transplantation Model of Human Brain Glioma with High Invasiveness and Overexpression of EGFR in Nude Mice
     Objective To establish orthotopic transplantation model of human brain glioma in nude mice with characteristics of high invasiveness and overexpression of EGFR .Methods Human glioblastoma multiforme cell line with overexpression of EGFR was cultured in vitro,then tumor cells were injected stereotaxically into the right caudate nucleus of nude mice.The newly formed solid tumor were sharply dissected and solid were passed in the right caudate nucleus of nude mice. Histological characteristics and EGFR protein in the xenografts were determinated by HE staining or immunohistochemical method,respectively.Results The xenografts have been passed continuously in 130 mice for 13 generations in caudate nucleus of nude mice, and the survival time were 19±1.33 day.Histological assay suggests the grafts were high invasiveness and overexpression of EGFR,which were in accordance with the characteristics of human glioblastoma multiforme. The tumor proliferation curve measured at different time points suggests that tumor latent period were shoter(<3 day), rapidly proliferative phase were longer(>15 day),and from the advanced stage to dead point were shorter(<3 day). Conclusion Compared with tumor cells suspension directly innoculated into the caudate nucleus of nude mice,the transplantion of solid tumor tissue take on the advantages of not only injection of plenty of tumor cells,but also with tumor matrix which are necessary for the rapid tumor growth,hence embody the features of high malignant glioma with high invasiveness and overexpression of EGFR.
     PartⅢEstablishment of Orthotopic Transplantation model of Metastatic Carcinoma Masses of Human Brain in Nude Mice
     Objective To establish an orthotopic transplantation model of brain metastasis of human lung adenocarcinoma in nude mice and analysize its biological features.Methods Human brain metastatic tumor masses were collected and orthotopicly transplanted into the right caudate nucleus of nude mice. The newly formed xenografts were sharply minced into pieces and re-transplanted. The efficiency of tumorigenicity and the survival time of tumor-bearing mice were observed. HE staining and MRI scanning were performed to investigate the histopathological and imaging features of this metastatic lesion. The expression of tumor marker (CEA) and mucin in xenografts was also investigated by immunohistochemical or Alcian blue/PAS assays.Results The brain xenografs were passed into 65 nude mice to the 6th generation in the right caudate nucleus of nude mice,with average survival time of tumor-bearing mice 47.6±1.8d for primary generation and 38.0±0.9d for 4-6 generation;Histopathologically, the cerebral xenografts were poorly differentiated andenocarcinoma without invasiveness to normal brain tissue. MRI revealed a well-delimitated mass without surrounding edema, which perfectly recapitulated the original tumor. Expression of CEA and acid mucin was positive in the cerebral xenografts.Conclusions The orthotopic xenografts of brain metastasis from human lung andenocarcinoma could faithfully recapitulate the original tumor clinically and pathologically, and provides a reliable animal model not only for studying the biological features but also for experimental treatment of brain metastasis from lung adenocarcinoma.
     PartⅣPrimarily Investigation on the Human Glioma Stem Cells Transplanted in the Nude Mice with GFP Expression
     Objective To incubate nude mice which could stably express green fluoresent protein(GFP), then human glioma stem cells(GSCs)were transplanted intracranially into NC nude mice with GFP expression. Methods Transgenic C57BL/6J mouse expressing GFP was crossed with NC nude mouse, then the male nude mouse expressing GFP was crossed with the female pubescence mouse to obtain nude mouse with GFP expression, expression of GFP in the skin and organs of nude mice were evaluated under direct observation, by immuno histochemiscal and immunofluorescence assay. Accordingly GSCs were transplanted orthotopically into the brains of nude mice expressing GFP to observe the biological characteristics of the intracranial growth of the transplaned tumor. Results The organs and cells were all obviously expressed GFP in the nude mice propagated to 8th generation. Nonluminous tumour cells were distinguished from the host cell distinctly in the brains bearing tumor- transplanted orthotopically. Microanatomy relationship was clearly showed between the brain cells of host and tumour cells with immunohistochemiscal assay, which stained the tumor cells with species-specific monoclonal antibody(HLA)coupled with red fluorescer(PE) through confocal microscopy. Conclusions The nude mice expressing GFP were obtained by crossing the trangenic mice bearing na?ve immunity with NC nude mice. Orthotopic transplantation of human brain glioma may be used in the investigation on the tumour tissue reconstitution for the identification between the transplantation tumor and host tissue .
引文
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