利用裸鼠建立人泌尿生殖系统肿瘤细胞系

目的建立人泌尿系肿瘤无限细胞系,为泌尿系肿瘤研究提供实验模型.方法无菌取下肿瘤标本后,将标本剪成大小约1.0mm3的组织块,在裸鼠右后肢皮下包埋,当皮下肿瘤块发生明显增殖并长到一定程度后,再行裸鼠体内传代两次,最后取下组织块进行原代培养.培养细胞传代超过20代后按建系标准[2]进行检测.结果共取40例标本,裸鼠体内传代F1代成功6例,F3代成功3例,该3例标本行原代培养后建成3个无限细胞系人肾透明细胞癌RCC-9863,人膀胱癌BC-6,人前列腺癌PC-98106,全部细胞传代1年以上,生长稳定,传代周期固定,其形态结构,分化程度与原发瘤保持一致,染色体形态仍为人类核型.结论裸鼠肿瘤皮下种植法是泌尿系肿瘤建系的一个较好方法.     

人源性前列腺癌动物模型的初步建立

目的 建立中国人同一起源肿瘤不同恶性潜能前列腺癌动物模型,为研究前列腺癌转移进展机制及激素抵抗的发生机制提供理想的动物模型.方法 采用组织块外科原位移植法将人前列腺癌组织分别移植到虚拟去势组及去势组雄性裸小鼠前列腺部,成瘤后进行鼠间传代移植,选取虚拟去势组原位移植瘤、移植淋巴结转移瘤、去势组第4代淋巴结转移瘤体外培养建立细胞系,应用Boyden Chamber细胞运动实验检测细胞迁徙转移能力,描绘细胞生长曲线分析细胞增殖及激素依赖性,裸小鼠皮下异种移植瘤模型检测成瘤率、肿瘤湿重及浸润范围验证不同代移植瘤细胞在裸小鼠异种移植的生长状态.结果 第1代虚拟去势组成瘤率30％,无淋巴结转移,取移植瘤反复原位传代移植第3代成瘤率50％,盆腔淋巴结转移率40％.去势组原代移植以及来自虚拟去势组的原位移植瘤反复原位移植均未见移植瘤,源自虚拟去势组淋巴结转移瘤组织反复原位传代移植至第4代,成瘤率33％,其中一只可见盆腔淋巴结转移.三种细胞系细胞生长、迁徙以及体外裸小鼠成瘤率均有显著差别（P＜0.05）.结论 裸小鼠前列腺癌原位移植反复传代可增强肿瘤成瘤率、转移力等恶性指标.以裸小鼠淋巴结转移瘤接种去势裸小鼠可筛选出激素非依赖性异种移植瘤及转移瘤.     

人胃癌裸鼠胃原位移植转移模型的建立

目的 :建立人胃癌裸鼠原位移植转移模型 .方法 :用人胃癌细胞悬殊液接种于裸鼠皮下 ,形成稳定传代的皮下移植瘤 ,将皮下移植瘤组织再接种于裸鼠胃浆膜下 ,称为间接胃原位移植模型 ,并与直接用细胞悬液接种于裸鼠胃浆膜下、皮下、腹腔、尾静脉的移植瘤模型比较 ,观察移植肿瘤的生长状况、移植成功率和自发转移的发生率及组织学变化及细胞动力学改变等生物学特性 .结果 :肿瘤组织块保留了人胃腺癌的组织学特片 ,尾静脉注射与直接原位接种成瘤率均为6 0 % ,间接原位接种模型移植成瘤率为 80 % ,皮下与腹腔接种成瘤率均为 10 0 % .间接胃原位移植模型肝脏转移率为6 0 % ,直接胃原位移植模型肝脏转移率为 33.3% (P <0 .0 5 )尾静脉移植瘤模型仅见肝脏转移 ,实验过程中裸鼠衰竭处死后的肺脏经连续组织切片未见瘤细胞侵袭 .移植瘤细胞具有分泌CEA的功能 ,细胞动力学检测显示以五倍体细胞为主 .结论 :人胃癌裸鼠皮下 -胃原位移植瘤模型的生物学行学与人胃癌自然生长和转移过程相似 ,为研究人胃癌转移机制提供了理想的模型 .     

人膀胱癌细胞系BC-6的建立及其生物学特性

目的:建立人膀胱癌细胞系BC-6,为膀胱癌的基础研究提供实验模型.方法:18例膀胱癌标本采用组织块直接培养法、8例采用细胞悬液培养法行原代培养;其中12例同时行裸鼠皮下移植,在皮下生长后,连续裸鼠体内传代3次,再行体外培养.结果:组织块直接培养和细胞悬液培养均未成功.12例裸鼠皮下接种肿瘤有3例生长,l例裸鼠意外死亡,l例裸鼠体内传代F2代肿瘤消失.1例肿瘤裸鼠皮下接种后生长较快,裸鼠体内传代3次后,取部分肿瘤组织体外培养得到膀胱癌细胞系BC-6,其形态结构,分化程度与原发瘤保持一致,染色体形态仍为人类核型,众数维持在66～72之间,占82%,细胞周期分析G1期0.58,G2期0.08,S1期0.35,细胞群体培增时间为44h.结论:通过裸鼠体内移植瘤建立的膀胱癌细胞系BC-6,与原发癌保持相同的生物学特性,体外连续传代1 a以上,传代92代.细胞形态不变,生长周期恒定,己经成为一个稳定的细胞系.     

高侵袭性膀胱癌细胞系筛选及其裸鼠多器官转移模型的建立

目的通过体内培养筛选出高恶性度、高转移潜能的膀胱癌细胞系,构建膀胱癌裸鼠多器官转移模型,以期为进一步转移性膀胱癌的研究和诊疗奠定基础。方法将膀胱癌T24细胞系原位种植于裸鼠膀胱成瘤后(5周),取出原位瘤进行细胞培养,经胶原酶消化处理后以RPMI1640培养液+10%胎牛血清培养。采用差异性胰酶消化法进行传代以去除间质细胞。细胞系稳定传代(20代)后原位种植于6只裸鼠膀胱。5周后处死裸鼠,观察肿瘤局部浸润和远处转移情况。取下原位瘤体后,采用免疫组织化学法鉴定是否为膀胱尿路上皮来源。结果成功筛选出高侵袭性膀胱癌细胞系(T24M细胞系),T24M的细胞形态稳定,已经传至第86代,细胞形态和生长速度均无明显变化,且T24M细胞冻存复苏后的生长状态良好。将T24M细胞系稳定传代后(20代)种植于6只雌性裸鼠膀胱,35d后处死,解剖后发现,6只裸鼠均荷瘤成功且发生远处转移,平均每只裸鼠发生远处转移的器官数为7个(5~9个),包括髂血管淋巴结、腹膜后淋巴结和肝转移等,转移发生率为6/6,成功建立膀胱癌裸鼠多器官动物模型。免疫组织化学法检测,T24细胞系和T24M细胞系裸鼠膀胱原位肿瘤均高表达角蛋白CKAE1,可证实裸鼠肿瘤均来源于尿路上皮。结论膀胱癌裸鼠多器官转移模型成功建立。T24M细胞系和裸鼠多器官转移模型可用来进一步研究膀胱癌的发生、发展和转移机制。     

人大肠癌裸鼠皮下移植瘤模型的建立

目的：建立人大肠癌裸鼠皮下移植瘤模型的方法。方法：从新鲜的人大肠癌标本上切取肿瘤组织,移植于裸鼠皮下,原代移植成功后再进行传代,观察裸鼠摄食、活动状况、成瘤时间、成瘤率、潜伏期、肿瘤生长情况、移植瘤大小及组织病理学变化。结果：原代肿瘤移植成功率为40%,传代肿瘤移植成功率为75%,原代移植肿瘤及传代移植肿瘤组织形态学特征均与患者原发肿瘤保持一致。结论：初步建立了一种有效的人大肠癌裸鼠皮下移植瘤模型,为大肠癌的研究奠定了基础。     

龙葵素通过诱导细胞周期G1/S阻滞抑制裸鼠前列腺癌细胞Du145移植瘤生长

目的探讨龙葵素对前列腺癌细胞Du145 裸鼠移植瘤生长的影响及分子机制。方法采用高度恶性的转移前列腺癌 细胞株Du145 作为动物体内实验的模型,裸鼠皮下接种Du145 细胞建立裸鼠皮下瘤模型。1 周后将接种的裸鼠随机分为2 组：龙葵素实验组和生理盐水空白对照组,每3 d 分别向实体瘤中间部位注射0.2 mL龙葵素（50 μg/mL）和生理盐水,观察裸 鼠体内肿瘤生长,3 周后颈椎脱臼处死裸鼠,剥离肿瘤组织,测量肿瘤的重量并根据肿瘤重量计算抑瘤率。实时荧光定量 PCR和Western blotting 技术检测各组裸鼠瘤体细胞周期相关基因mRNA和蛋白表达。Tunel 原位检测各组裸鼠瘤体组织凋 亡情况。结果龙葵素治疗组裸鼠肿瘤成瘤率明显下降,裸鼠瘤体生长速度明显低于对照组（P<0.01）。龙葵素能抑制瘤体 细胞CyclinD1、CyclinE1、CDK2、CDK4 和CDK6 基因mRNA和蛋白的表达,显著升高p21 基因mRNA和蛋白的表达,龙葵素 干预后裸鼠瘤体组织凋亡显著增加（P<0.01）。结论龙葵素可通过调控细胞周期G1/S 关卡促进组织细胞凋亡抑制前列腺 癌细胞裸鼠移植瘤生长。     

胰腺癌裸鼠皮下及原位模型的建立

目的:建立胰腺癌裸鼠皮下及原位模型的方法,并为胰腺癌体内实验提供实验基础。方法:利用人胰腺癌细胞SW1990制备细胞悬液给予皮下荷瘤鼠组腋下种植,记录原位组肿瘤长径短径病计算肿瘤体积,并测量体重,原位组为将细胞悬液原位移植于裸鼠胰腺,从而建立裸鼠原位种植胰腺癌模型。结果:各组均未出现术后死亡情况,术后成瘤率为100%。接种后两组接种后体重均变化平稳,皮下移植瘤组肿瘤体积于接种第五天后呈指数增长,第九天达到125.6±20.02mm3,原位模型组则可于体表触及凸起肿块。结论:建立了两种稳定可靠成瘤率高的胰腺癌动物模型,为胰腺癌的研究提供了基础。     

卵巢癌细胞株SKOV3可塑性形成拟态血管的体内研究

目的检测人上皮性卵巢癌细胞株SKOV3移植裸鼠腹腔成瘤后血管生成拟态的形成和分子塑形的改变。方法采用慢病毒转染SKOV3细胞携带绿色荧光蛋白,接种裸鼠腹腔成瘤后,苏木精-伊红染色、透射电镜、荧光显微镜观察肿瘤组织切片,免疫组化、肿瘤原代培养后采用免疫荧光化学、流式细胞仪、RT-PCR等技术检测SKOV3细胞是否表达血管内皮标记CD31等。结果苏木精-伊红染色、透射电镜、荧光显微镜证实SKOV3细胞裸鼠腹腔内成瘤后形成了血管生成拟态,即SKOV3细胞在没有宿主血管内皮细胞参与下,形成特有的腔隙样管道,内有红细胞衬覆。在原代培养的SKOV3细胞,用免疫荧光化学、RT-PCR检测显示SKOV3细胞表达CD31,用流式细胞仪检测,SKOV3细胞表达CD31、Ⅷ因子,而不表达VEGF。结论人上皮性卵巢癌细胞株SKOV3在体内能表达部分血管内皮细胞的特异性抗原,具有可塑性,可在体内形成血管生成拟态。     

泌尿生殖系统肿瘤无限细胞系的建立

目的 建立人泌尿系肿瘤无限细胞系,为泌尿系肿的基础研究提供实验模型。方法 无菌取下肿瘤手术标本,分别采用组织块直接培养法,细胞悬液法,裸鼠肿瘤移植模型法进行细胞原代培养。裸鼠皮下肿瘤块发生明显增殖并长到一定程度后,再行裸鼠体内传代两次,最后取下Ｆ３代组织块进行原代培养。培养细胞传代超过２０代后按建系标准进行检测。结果 共取４３例标本,其中３８例行组织块直接培养,１８例Ｆ１代培养成功,５例Ｆ３代培养     

不同细胞系在骨肉瘤动物模型中的成瘤差异性比较

目的:探讨不同细胞系在骨肉瘤动物模型中的成瘤差异性。方法:⑴对Mg-63和U-2 OS两系细胞分别行细胞划痕实验和transwell实验;⑵32只裸鼠随机分为Mg-63细胞悬液法、组织块法与U-2 OS细胞悬液法、组织块法4组,每组8只。两种细胞系分别采取细胞悬液法和组织块移植法进行股骨远端原位骨肉瘤重建,统计4组原位骨肉瘤模型成瘤率、瘤重以及肿瘤转移率等指标。结果:细胞划痕实验中,Mg-63和U-2 OS在划痕48 h后迁移距离分别为(381.2±23.6)、(591.9±35.1)μm。骨肉瘤细胞transwell实验中,Mg-63和U-2 OS 16 h后穿膜细胞数分别为24.0±2.6,81.9±3.1。骨肉瘤造模实验中,Mg-63悬液法组成瘤率、肺转移率、淋巴结转移率、4周瘤重分别为62.5%,10.4%,0,(2.1±0.1)g;Mg-63组织块法组分别为100%,76.8%,20.7%,(2.4±0.3)g;U-2 OS悬液法组分别为100%,45.8%,0,(2.4±0.6)g;U-2 OS组织块法组分别为100%,82.3%,41.1%,(2.6±0.4)g。结论:U-2 OS细胞系拥有较高的组织侵袭性和细胞增殖能力,是一种良好的骨肉瘤原位模型制作细胞系。     

维拉帕米对脑膜瘤生长影响的实验研究

目的探讨钙通道阻滞剂维拉帕米对脑膜瘤细胞增殖的影响.方法将不同浓度的维拉帕米作用于培养的脑膜瘤细胞,MTT法观察其对细胞增殖的抑制作用.建立裸鼠皮下脑膜瘤模型,观察服用维拉帕米后肿瘤的生长情况,免疫组化检测皮下肿瘤增殖细胞核抗原(PCNA)的表达.结果维拉帕米浓度呈依赖性地抑制脑膜瘤细胞增殖,浓度为1μ mol/L时即有抑制效应,100μmol/L时抑制作用最明显.服药组肿瘤的体积明显小于对照组(P＜0.01),其PCNA的表达也低于对照组(P＜0.05).结论维拉帕米在体外和体内均可抑制脑膜瘤细胞的增殖和生长.     

人脑胶质瘤干细胞移植于表达绿色荧光蛋白裸小鼠的研究

目的 培育表达绿色荧光蛋白(GFP)的裸小鼠,并探讨将其用于人胶质瘤干细胞(HGSC)移植实验研究.方法 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的无毛雄鼠与有毛母鼠交配,通过肉眼、免疫组织化学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HGSC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 传至8代的裸小鼠,包括脑在内的全身主要器官和细胞都表达GFP.对用于HGSC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.而瘤细胞经人特异白细胞抗体(HLA)连接红色荧光剂(PE)的免疫组织化学染色后,在共聚焦显微镜下可清晰显示与宿主脑细胞的组织学关系.结论 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HGSC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.     

PSMA7在胃癌中的表达及对胃癌增殖、侵袭迁移及成瘤能力的影响

目的研究PSMA7在胃癌中的表达及其对胃癌增殖、侵袭迁移及裸鼠皮下成瘤能力的影响。方法收集60例胃癌患者的 癌组织及配对的癌旁组织,应用免疫组化法检测胃癌和配对癌旁组织中PSMA7的表达水平;应用慢病毒转染技术在胃癌细胞 株SGC7901中干扰PSMA7;应用Cell Counting Kit-8（CCK-8）和细胞克隆形成实验检测胃癌细胞增殖能力的变化,Transwell实 验检测胃癌细胞侵袭迁移能力的变化;稳转细胞株构建裸鼠皮下移植瘤模型,研究干扰PSMA7对皮下移植瘤的影响。结果 免疫组化结果显示PSMA7在胃癌组织中的表达水平显著高于其配对的癌旁组织（P<0.05）;在人胃癌细胞株SGC7901中下调 PSMA7表达能够显著抑制肿瘤细胞的增殖、侵袭迁移能力（P<0.05）;在BALB/c小鼠皮下移植瘤模型中干扰PSMA7的表达能 够明显抑制皮下移植瘤的生长（P<0.05）。结论PSMA7在胃癌组织中高表达,干扰PSMA7抑制胃癌细胞增殖、侵袭迁移及裸 鼠皮下成瘤的能力。     

Cal27裸鼠口腔癌转移模型的建立及其意义

目的 建立Cal27舌鳞癌动物正位移植瘤淋巴道转移模型, 为进一步研究口腔癌细胞转移的规律及分子机制提供帮助.方法 经口底将2×106 Cal27细胞悬液0.08 mL分别注射至24只裸鼠下颌舌骨肌与颏舌肌之间.成瘤后定期测量肿瘤体积, 记录裸鼠体重变化;14 d后处死裸鼠, 对组织切片型HE染色观察组织结构异型性和细胞异形性, 颌下淋巴结及肺、肝有无转移, 并统计转移率.结果 裸鼠在接种Cal27细胞第3天成瘤, 成瘤率100% (24/24) .HE染色示肿瘤组织呈典型鳞癌表现.颌下淋巴结内可见转移鳞癌细胞, 转移率70% (17/24) .肝、肺未见转移.结论 成功建立Cal27裸鼠正位移植瘤淋巴道转移模型.此动物模型能客观反应口腔癌生物学行为, 模拟口腔癌区域淋巴结转移的过程, 是研究口腔鳞状细胞癌侵袭转移较理想动物模型之一.     

Incubation and application of transgenic green fluorescent nude mice in visualization studies on glioma tissue remodeling

Background The primary reasons for local recurrence and therapeutic failure in the treatment of malignant gliomas are the invasion and interactions of tumor cells with surrounding normal brain cells. However, these tumor cells are hard to be visualized directly in histopathological preparations, or in experimental glioma models. Therefore, we developed an experimental human dual-color in vivo glioma model, which made tracking solitary invasive glioma cells possible, for the purpose of visualizing the interactions between red fluorescence labeled human glioma cells and host brain cells. This may offer references for further studying the roles of tumor microenvironment during glioma tissue remodeling. Methods Transgenic female C57BL/6 mice expressing enhanced green fluorescent protein (EGFP) were crossed with male Balb/c nude mice. Then sib mating was performed continuously in order to establish an inbred nude mice strain with 50% of their offspring that are EGFP positive. Human glioma cell lines U87-MG and SU3 were transfected with red fluorescent protein (RFP) gene, and a rat C6 glioma cell line was stained directly with CM-DiI, to establish three glioma cell lines emitting red fluorescence (SU3-RFP, U87-RFP, and C6-CM-DiI). Red fluorescence tumor cells were inoculated via intra-cerebral injection into caudate nucleus of the EGFP nude mice. Tumor-bearing mice were sacrificed when their clinical symptoms appeared, and the whole brain was harvested and snap frozen for further analysis. Confocal laser scanning microscopy was performed to monitor the mutual interactions between tumor cells and host brain cells. Results Almost all the essential tissues of the established EGFP athymic Balb/c nude mice, except hair and erythrocytes, fluoresced green under excitation using a blue light-emitting flashlight with a central peak of 470 nm, approximately 50% of the offsprings were nu/nu EGFP+. SU3-RFP, U87-RFP, and C6-CM-DiI almost 100% expressed red fluorescence under the fluorescence microscope. Under fluorescence microscopic view, RFP cells were observed growing wherever they arrived at, locating in the brain parenchyma, ventricles, and para-vascular region. The interactions between the transplanted tumor cells and host adjacent cells could be classified into three types: (1) interweaving; (2) mergence; and (3) fusion. Interweaving was observed in the early stage of tumor remodeling, in which both transplantable tumor cells and host cells were observed scattered in the tumor invading and spreading area without organic connections. Mergence was defined as mutual interactions between tumor cells and host stroma during tumorigenesis. Direct cell fusion between transplantable tumor cells and host cells could be observed occasionally. Conclusions Our study showed that self-established EGFP athymic nude mice offered the possibility of visualizing tumorigenesis of human xenograft tumor, and the dual-color xenograft glioma model was of considerable utility in studying the process of tumor remodeling. Based on this platform, mutual interactions between glioma cells and host tissues could be observed directly to further elucidate the development of tumor microenvironment.     

Incubation and application of transgenic green fluorescent nude mice in visualization studies on glioma tissue remodeling

Background  The primary reasons for local recurrence and therapeutic failure in the treatment of malignant gliomas are the invasion and interactions of tumor cells with surrounding normal brain cells. However, these tumor cells are hard to be visualized directly in histopathological preparations, or in experimental glioma models. Therefore, we developed an experimental human dual-color in vivo glioma model, which made tracking solitary invasive glioma cells possible, for the purpose of visualizing the interactions between red fluorescence labeled human glioma cells and host brain cells. This may offer references for further studying the roles of tumor microenvironment during glioma tissue remodeling.

Methods  Transgenic female C57BL/6 mice expressing enhanced green fluorescent protein (EGFP) were crossed with male Balb/c nude mice. Then sib mating was allowed to occur continuously in order to establish an inbred nude mice strain with 50% of their offspring that are EGFP positive. Human glioma cell lines U87-MG and SU3 were transfected with red fluorescent protein (RFP) gene, and a rat C6 glioma cell line was stained directly with CM-DiI, to establish three glioma cell lines emitting red fluorescence (SU3-RFP, U87-RFP, and C6-CM-DiI). Red fluorescence tumor cells were inoculated via intra-cerebral injection into caudate nucleus of the EGFP nude mice. Tumor-bearing mice were sacrificed when their clinical symptoms appeared, and the whole brain was harvested and snap frozen for further analysis. Confocal laser scanning microscopy was performed to monitor the mutual interactions between tumor cells and host brain cells.

Results  Almost all the essential tissues of the established EGFP athymic Balb/c nude mice, except hair and erythrocytes, fluoresced green under excitation using a blue light-emitting flashlight with a central peak of 470 nm, approximately 50% of the offsprings were nu/nu EGFP+. SU3-RFP, U87-RFP, and C6-CM-DiI almost 100% expressed red fluorescence under the fluorescence microscope. Under fluorescence microscopic view, RFP+ cells were observed growing wherever they arrived at, locating in the brain parenchyma, ventricles, and para-vascular region. The interactions between the transplanted tumor cells and host adjacent cells could be classified into three types: (1) interweaving; (2) mergence; and (3) fusion. Interweaving was observed in the early stage of tumor remodeling, in which both transplantable tumor cells and host cells were observed scattered in the tumor invading and spreading area without organic connections. Mergence was defined as mutual interactions between tumor cells and host stroma during tumorigenesis. Direct cell fusion between transplantable tumor cells and host cells could be observed occasionally.

Conclusions  This study showed that self-established EGFP athymic nude mice offered the possibility of visualizing tumorigenesis of human xenograft tumor, and the dual-color xenograft glioma model was of considerable utility in studying the process of tumor remodeling. Based on this platform, mutual interactions between glioma cells and host tissues could be observed directly to further elucidate the development of tumor microenvironment.

     

TIMP—2基因转染对高转移性人巨细胞肺癌细胞系生物学行为的影响

探讨金属蛋白酶组织抑制因子ＴＩＭＰ－２对肿瘤恶性表型的逆转作用及其在肿瘤基因治疗上的意义。方法利用基因重组技术构建了含全长ＴＩＭＰ－２ｃＤＮＡ的真核表达载体，用脂质体法转染高转移性人肺癌细胞（ＰＧ），检测转染后ＰＧ细胞的金属蛋白酶（ＭＭＰｓ）活性、体外侵袭、裸鼠体内成瘤性及转移能力等多项生物学行为的变化。并以ＴＩＭＰ－２基因转染前后ＰＧ细胞的裸鼠皮下移植瘤为研究对象，利用免疫组织化学和原位杂交方法，研究在整体环境下ＭＭＰ－２、ＭＭＰ－９和ＴＩＭＰ－１、ＴＩＭＰ－２的ｍＲＮＡ及蛋白表达情况。结果转染细胞较母系细胞ＴＩＭＰ－２ｍＲＮＡ表达增强，ＭＭＰ－２、ＭＭＰ－９的产生及活性无明显变化，体外增殖能力增强，但体外侵袭和软琼脂集落形成能力以及裸鼠体内成瘤性及自发转移能力下降。此外，ＭＭＰ－２、ＭＭＰ－９和ＴＩＭＰ－１、ＴＩＭＰ－２在ＰＧ细胞之裸鼠皮下移植瘤的间质细胞及肿瘤细胞均有表达，阳性的肿瘤细胞主要位于肿瘤和间质交界处。结论特异性上调ＴＩＭＰ－２基因的表达可在一定程度上逆转ＰＧ细胞的恶性表型。     

裸鼠胶质瘤模型的建立及其病理

目的 建立裸鼠胶质瘤动物模型。方法 采用瘤细胞悬液接种法和瘤组织块接种法制作裸小鼠皮下移植瘤,并研究肿瘤的病理组织学特征。结果 两种方法所建肿瘤模型其成功率均为１００％,肿瘤生长状况良好,裸鼠无明显恶异质变化,肿瘤病理形态检查符合胶质瘤细胞的形态学特征,免疫组化证实体外培养的胶质瘤细胞和体内胶质瘤组织胶质纤维酸性蛋白均高表达。结论 该方法所建裸鼠皮下移植瘤模型能作为研究胶质瘤发病机制、生物学特性以