CD基因对人胰腺癌细胞株Patu 8988杀伤作用的研究

目的　探讨腺病毒介导胞嘧啶脱氨酶 (CD )基因对人胰腺癌细胞株Patu 8988的杀伤作用。方法　采用细菌内同源重组方法 ,构建含胞嘧啶脱氨酶 (CD)基因重组腺病毒载体 ,经 2 93细胞包装、扩增 ,氯化铯密度梯度离心制备纯化高效的重组腺病毒 ,体外转染人胰腺癌细胞株Patu 8988,并给予前药 5 Fc ,观察其体外杀伤效果。结果　含CD基因的腺病毒载体经酶切鉴定正确 ,包装纯化后 ,检测病毒滴度为 2× 10 11pfu/ml ,将重组腺病毒转染胰腺癌细胞株Patu 8988,加用前药 5 Fc后 ,转染CD基因的Patu 8988细胞及混育的胰腺癌细胞生长明显受抑制。结论　CD腺病毒不仅转染效果强 ,而且可直接或通过旁观者效应杀伤胰腺癌细胞。自杀基因治疗有可能成为治疗胰腺癌的有效方法     

Ad.smac腺病毒的构建及其体外抗肿瘤效应的初步研究

目的 通过细菌内同源重组，制备表达全长smac基因的腺病毒，初步观察其体外对肿瘤细胞的杀伤作用。方法 构建含smac基因的腺病毒穿梭载体pAdTrack—smac，与骨架载体pAdEasyl在细菌内重组为pAd．smac，经293细胞包装为增殖缺陷性腺病毒。体外感染各种肿瘤细胞，用苔盼蓝拒染法观察其对肿瘤细胞的杀伤作用。结果 利用AdEasy^TM系统成功构建了Ad．smac及对照腺病毒Ad．GFP，多种肿瘤细胞感染Ad．smac后均出现细胞凋亡现象，对肿瘤细胞的杀伤率达30％以上。结论 利用细菌内质粒同源重组法可快速简捷地制备表达外源基因的腺病毒，Ad．smac在体外通过诱导细胞凋亡而有效地杀伤肿瘤细胞，为Smac在肿瘤治疗的应用提供了一定的试验参考依据。     

含人AFP基因重组腺病毒载体的构建及其转染树突状细胞瘤苗的制备

目的:构建含人AFP基因的腺病毒载体,体外转染树突状细胞,制备树突状细胞肝癌瘤苗.方法: 将AFP基因亚克隆到pIND 载体和Shuttle2载体中,构建穿梭载体Shuttle2-AFP.用PI-Sce Ⅰ和I-CeuⅠ双酶切后将所获AFP基因片段再与线性化的腺病毒载体pAdeno-X连接,构成pAdeno-AFP重组腺病毒载体.其后,用重组腺病毒载体转染HEK293细胞,包装腺病毒表达载体.通过酶切、PCR对腺病毒载体进行鉴定.包装好的重组病毒载体pAdeno-AFP体外感染树突状细胞制备树突状细胞肝癌瘤苗后,FACS分析pAdeno-AFP/DC表面分子的表达,酶联免疫吸附试验法( ELISA) 检测AFP水平.结果: 酶切、PCR鉴定证实,穿梭质粒插入片段为AFP基因.包装的腺病毒载体具有良好的感染性,可以在293细胞中形成病毒颗粒,腺病毒载体内携带AFP基因感染树突状细胞,pAdeno-AFP/DC能高水平的表达CD1a,CD11c,CD80,CD86以及HLA-DR,并分泌较高水平的AFP.结论: 构建成功的含AFP腺病毒载体可以在树突状细胞中表达AFP,为DC瘤苗的进一步研究奠定了基础.     

蜂毒素基因重组腺病毒对肝癌细胞的杀伤作用

目的：构建携蜂毒素基因及甲胎蛋白（AFP）启动子（rAFP)的重组腺病毒载体，探讨rAFP驱动的蜂毒素基因在体外对肝癌细胞的特异性杀伤作用。方法：人工合成蜂毒素基因，置于rAFP之后，用细菌内高效同源重组法将目的基因重组入腺病毒质粒中，转染人胚肾293细胞进行腺病毒包装；采用MTT法测定蜂毒素基因转染对AFP阳性，阴性肝癌细胞及正常肝细胞增殖的影响。结果：携蜂毒素基因重组腺病毒载体构建成功，MTT实验证明携蜂毒素基因重组腺病毒转染后，AFP阳性肝癌细胞的增殖受到明显抑制，而对AFP阴性肝癌细胞及正常肝细胞无明显影响；无蜂毒素基因的重组腺病毒转染，则对各种细胞增殖均无抑制作用。结论：表达rAFP驱动的蜂毒素基因的重组腺病毒在体外可特异性地杀伤AFP阳性肝癌细胞。     

小鼠SFRP-2基因的克隆及重组腺病毒制备

目的构建小鼠secretedfrizzled-related protein-2(SFRP-2)全基因的重组腺病毒表达系统。方法采用基因工程技术,将SFRP-2基因片段克隆入穿梭质粒pAdTrack-CMV,然后在细菌内与pAdEasy-1进行同源重组,经脂质体转染293细胞包装并扩增腺病毒颗粒。体外原代培养小鼠子宫内膜基质细胞,转染制备的腺病毒颗粒,并用Western blot法检测SFRP-2蛋白的表达。结果构建的小鼠SFRP-2重组腺病毒载体的效价达到5.6×1012pfu/mL,转染原代培养的小鼠子宫内膜基质细胞48h后,有SFRP-2蛋白的明显表达。结论成功构建含小鼠SFRP-2全基因的重组腺病毒载体。     

含人AFP基因重组腺病毒载体的构建及其转染树突状细胞瘤苗的制备

目的：构建含人AFP基因的腺病毒载体,体外转染树突状细胞,制备树突状细胞肝癌瘤苗。方法：将AFP基因亚克隆到pIND载体和Shuttle2载体中,构建穿梭载体Shuttle2-AFP。用PI—SceⅠ和I—Ceu Ⅰ双酶切后将所获AFP基因片段再与线性化的腺病毒载体pAdeno—X连接,构成pAdeno—AFP重组腺病毒载体。其后,用重组腺病毒载体转染HEK293细胞,包装腺病毒表达载体。通过酶切、PCR对腺病毒载体进行鉴定。包装好的重组病毒载体pAdeno—AFP体外感染树突状细胞制备树突状细胞肝癌瘤苗后,FACS分析pAd-eno—AFP／DC表面分子的表达,酶联免疫吸附试验法（ELISA）检测AFP水平。结果：酶切、PCR鉴定证实,穿梭质粒插入片段为AFP基因。包装的腺病毒载体具有良好的感染性,可以在293细胞中形成病毒颗粒,腺病毒载体内携带AFP基因感染树突状细胞,pAdeno—AFP／DC能高水平的表达CD1a,CD11c,CD80,CD86以及HIA—DR,并分泌较高水平的AFP。结论：构建成功的含AFP腺病毒载体可以在树突状细胞中表达AFP,为DC瘤苗的进一步研究奠定了基础。     

HBx基因重组腺病毒载体构建及其在SMMC-7721细胞中的表达

目的:利用pAdEasy1腺病毒载体系统构建人HBx基因重组腺病毒,感染肝癌细胞株SMMC7721使HBx基因有效表达。方法:自真核表达载体pcDNA3.1(-)HBx中获得HBx基因,插入腺病毒穿梭质粒pAdTrackCMV中构建pAdTrackCMVHBx,然后经PmeⅠ酶切线性化,电转化到含腺病毒骨架质粒pAdEasy1的BJ5183感受态细菌中。挑选和鉴定正确的同源重组质粒,然后将线性化的重组质粒转染293N细胞,产生重组病毒颗粒,并进一步感染SMMC7721细胞株。结果:经限制性内切酶酶切和基因测序鉴定,证实pAdTrackCMVpAdEasy1HBx重组成功,借助荧光显微镜可以观察到绿色荧光蛋白GFP在293N和SMMC7721细胞株中表达。结论:成功构建了携带HBx基因的重组腺病毒载体,并在SMMC7721细胞中使HBx基因有效表达,为后续研究奠定了基础。     

腺病毒介导的HBsAg基因修饰树突状细胞瘤苗的制备

目的:构建含人HBsAg基因的腺病毒载体,体外转染树突状细胞,制备树突状细胞肝癌瘤苗。方法:将HBsAg基因亚克隆到pIND载体和Shuttle2载体中,构建穿梭载体Shuttle2-S。用PI-SceⅠ和I-CeuⅠ双酶切后将所获HBsAg基因片段再与线性化的腺病毒载体pAdeno-X连接,构成pAdeno-S重组腺病毒载体。其后,用重组腺病毒载体转染HEK293细胞,包装腺病毒表达载体。通过酶切、PCR对腺病毒载体进行鉴定。包装好的重组病毒载体pAdeno-S体外感染树突状细胞制备树突状细胞肝癌瘤苗后Westernblot法检测其表达,流式细胞仪检测其能否诱导树突状细胞凋亡。结果:酶切、PCR鉴定证实,穿梭质粒插入片段为HBsAg基因。包装的腺病毒载体具有良好的感染性,可以在293细胞中形成病毒颗粒,腺病毒载体内携带HBsAg基因感染树突状细胞,经Westernblot法鉴定证实能够表达转染基因,并且不会诱导树突状细胞凋亡。结论:构建成功的含HBsAg腺病毒载体可以在树突状细胞中表达HBsAg,为DC瘤苗的进一步研究奠定了基础。     

腺病毒介导的肝癌自杀基因疗法的实验研究

本文观察了胞嘧啶脱氨酶(CD)基因/5-氟胞嘧啶(5FC)自杀基因疗法对肝癌模型的治疗作用。以CMV启动子调控CD基因的重组腺病毒载体AdexCMV.CD在体外能有效转染人肝癌细胞株SMMC-7721和HepG2,转染后的细胞体外生长能力无明显变化,对5FC的敏感性明显增高。当以AFP上游调控序列驱动CD基因的重组腺病毒载体AdexAFP.CD分别转染SMMC-7721和HepG2时,CD基因能在HepG2中表达,使HepG2对5FC的敏感性增高,但不能使SMMC-7721的生长受到5FC的抑制。[~3H]TdR掺入法观察体外旁观者效应时发现,当细胞总数中转染细胞数超过20％时,其生长明显被5FC抑制。将AdexCMV.CD直接注射入裸鼠接种SMMC-7721细胞形成的皮下肿瘤中,并全身应用5FC后,与对照组相比,肿瘤大小在开始治疗后第8天约缩小3倍,第18天约缩小4倍,以上结果表明,腺病毒介导的CD/5FC自杀基因系统能在体内、外有效地抑制肝癌的生长。以AFP上游调控序列驱动CD基因的腺病毒载体介导的基因转染能在AFP阳性的肝癌细胞中特异表达。     

CD/5-FC系统对小鼠胃癌细胞杀伤作用的研究

目的：探讨CD5／5－FC自杀基因系统对小鼠胃癌细胞的体外杀伤作用及其机制。方法：以逆转录病毒载体介导CD基因转导小鼠胃癌细胞株MFC,采用MTT法测定CD／5－FC系统的体外杀伤作用及其“旁观者”效应;利用Hoechst 33258荧光染色法、琼脂糖凝胶电泳法检测凋亡细胞,同时采用半定量RT－PCR技术检测凋亡相关基因的表达。结果：转导CD基因可使MFC对5－FC高度敏感,并且显示出强大的“旁观者”效应。经5－FC作用后,荧光染色可见到典型的凋亡细胞核形态学改变,琼脂糖凝胶电泳出现典型的DNA梯度,同时发现凋亡相关基因bcl-2基因表达下调,而bax与caspase-3基因表达上调。结论：CD／5－FC自杀基因系统对小鼠胃癌细胞MFC具有强大的杀伤作用,体外杀伤作用是通过诱导MFC的凋亡来完成。     

肿瘤双自杀基因治疗系统pTRKH2-PsT/CD,pTRKH2-PsT/UPRT在厌氧婴儿双歧杆菌中的构建

Objective: We recombine the suicide gene CD, UPRT into plasmid pTRKH2 and clone the recombinant dual suicide gene therapy system into tumor-hypoxia-targeting vector Bifidobacterium infantis and characterize its function. Methods: CD gene, UPRT gene and lactic acid bacteria expression plasmid pTRKH2 were digested by restriction endonuclease BamH I and Sal I, and constructed recombinant plasmids pTRKH2/CD and pTRKH2/UPRT in E. coll. The recombinant plasmids were then transfected into Bifidobacterium Infantis by electroporation. Identification of pTRKH2/CD and pTRKH2/UPRT was processed by dual restriction endonuclease digesting and sequencing. RT-PCR and SDS-PAGE were used to examine the expression of CD and UPRT genes at RNA and protein levels. The killing effects on Melanoma B16-F10 cells by pTRKH2/CD and pTRKH2/UPRT suicide gene therapy system with 5-FC were examined by MTT assay. Results: The CD gene and UPRT gene was successfully recombined into lactic acid bacteria expression plasmid pTRKH2. After dual endonuclease digestion of plasmid purified from the positively transfected E. co/i, two fragments of 6.9 Kb and 1.3 Kb were found for CD gene and two fragments of 6.9 Kb and 620 bp were found for UPRT gene. The sequencing of CD gene and UPRT gene proved consistent sequences with Genebank published data. A fragment of 1.3 Kb for CD gene and fragment of 620 bp for UPRT gene was found in recombinant Bifidobac- terium by RT-PCR. A 52 KDa protein for CD gene was identified in whole-cell protein of recombinant Bifidobacterium and a 26 KDa protein for UPRT gene was identified in supernatant fluid of recombinant Bifidobacterium. The survival rate of tumor cells treated by extracts from culture of recombinant Bifidobacterium with 5-FC showed a strong killing effects of pTRKH2/CD and pTRKH2/UPRT dual suicide gene therapy system on Melanoma B16-F10 cells. Conclusion: CD gene and UPRT gene are suc- cessfully inserted into pTRKH2 and transfected into tumor-hypoxia-targeting vector Bifldobacterium Infantis. This dual suicide gene therapy system shows a high efficiency for tumor cells killing.     

CD自杀基因联合淋巴细胞趋化因子基因疗法的肿瘤治疗作用及免疫机理研究

本研究以腺病毒作为载体,将大肠杆菌胞嘧啶脱氨酶(CD)基因与小鼠淋巴细胞趋化因子(Ltn)基因体内联合转染,观察了其抗肿瘤效应并分析了免疫机理.小鼠皮下接种结肠腺癌CT26细胞后3天,肿瘤局部注射表达Ltn的重组腺病毒AdLtn和表达CD的重组腺病毒AdCD,然后连续10天给予5一氟胞嘧啶(5-FC)300mg/kg进行治疗,结果表明,联合治疗组荷瘤小鼠皮下肿瘤结节的生长受到明显抑制,小鼠存活期明显长于单用AdLtn治疗组或单用AdCD/5-FC治疗组.经联合治疗后小鼠脾细胞的NK活性和对(37结肠腺癌细胞的CTL杀伤活性明显增强.瘤体细胞FACS分析结果表明,经联合基因治疗后,肿瘤组织CD4~ 、CD8~ 细胞浸润增加,结肠腺癌细胞表达H-2Kd和B7-1分子明显增加.提示经CD自杀基因和Ltn基因联合治疗后,肿瘤细胞免疫原性增加.本研究结果表明联合应用自杀基因和Ltn基因治疗可以提高机体对肿瘤细胞免疫的应答,增加机体的抗肿瘤作用,是肿瘤基因治疗中一条新的途径.     

逆转录病毒介导的双自杀基因对K562细胞杀伤作用的实验研究

目的 :观察逆转录病毒介导的双自杀基因对K5 6 2细胞的杀伤作用 ,探讨慢性粒细胞白血病的基因治疗方法。方法 :通过脂质体将含有双自杀基因的逆转录病毒载体PWZLneoCDglytk导入包装细胞PA317,经G4 18筛选后大量培养产病毒的阳性克隆PA317 CD +tk细胞株 ,收集病毒上清 ,浓缩后转染K5 6 2细胞 ,再次经G4 18筛选 ,获得稳定表达双自杀基因的K5 6 2 CD +tk细胞株。用RT PCR检测双自杀基因的表达。给予前体药物 5 氟胞嘧啶 (5 flourocytosine ,5 FC)和 或无环鸟苷 (Ganciciovir,GCV)后MTT法测定转基因组及未转基因组K5 6 2细胞的存活率。结果 :双自杀基因在K5 6 2细胞中可稳定表达 ,联合使用 5 FC和GCV对细胞增殖的杀伤作用及旁杀伤效应高于单独使用 5 FC或GCV。结论 :逆转录病毒介导自杀基因可有效杀死K5 6 2细胞 ,双自杀基因较单一自杀基因具有更强的抗肿瘤作用     

Combination of cytosine deaminase suicide gene expression with DR5 antibody treatment increases cancer cell cytotoxicity

Combined treatment using adenoviral-directed enzyme/prodrug therapy and immunotherapy has the potential to become a powerful alternative method of cancer therapy. We have developed adenoviral vectors encoding the cytosine deaminase gene (Ad-CD) and cytosine deaminase:uracil phosphoribosyltransferase fusion gene (Ad-CD:UPRT). A monoclonal antibody, TRA-8, specifically binds to death receptor 5, one of two death receptors bound by tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). The purpose of this study was to evaluate cytotoxicity in vitro and therapeutic efficacy in vivo of the combination of Ad-CD:UPRT and TRA-8 against human pancreatic cancer and glioma cell lines. The present study demonstrates that Ad-CD:UPRT infection resulted in increased 5-FC-mediated cell killing, compared with Ad-CD. Furthermore, a significant increase of cytotoxicity following Ad-CD:UPRT/5-FC and TRA-8 treatment of cancer cells in vitro was demonstrated. Animal studies showed significant inhibition of tumor growth of MIA PaCa-2 pancreatic and D54MG glioma xenografts by the combination of Ad-CD:UPRT/5-FC plus TRA-8 as compared with either agent alone or no treatment. The results suggest that the combination of Ad-CD:UPRT/5-FC with TRA-8 produces an additive cytotoxic effect in cancer cells in vitro and in vivo. These data indicate that combined treatment with enzyme/prodrug therapy and TRAIL immunotherapy provides a promising approach for cancer therapy.     

Efficacy of adenovirus-mediated CD/5-FC and HSV-1 thymidine kinase/ganciclovir suicide gene therapies concomitant with p53 gene therapy.

Recent evidence has suggested that tumor cells having a wild-type p53 status are more sensitive to chemotherapeutic agents and radiation than cells that lack functional p53. The heightened sensitivity of wild-type p53 cells is thought to be attributable to their propensity to undergo p53-mediated apoptosis after insult. Given that suicide gene therapy is essentially tumor-targeted chemotherapy, we examined the hypothesis that coexpression of wild-type p53 could enhance the efficacy of adenovirus-mediated suicide gene therapy. Human Hep3B and SK-OV-3 cells, which are null for p53, were infected with a pair of replication-deficient adenoviruses that expressed a cytosine deaminase/herpes simplex virus thymidine kinase (CD/HSV-1 TK) fusion gene without (fusion gene nonreplicative adenovirus, FGNR) or with (FGNRp53) the wild-type human p53 gene. The sensitivity of cells to the CD/5-fluorocytosine (CD/5-FC) and HSV-1 TK/ ganciclovir (GCV) enzyme/prodrug systems was determined in vitro and in vivo. Coexpression of p53 did not enhance the cytotoxicity of either the CD/5-FC or HSV-1 TK/GCV system in vitro. The failure to observe an effect of p53 could not be explained on the basis of insufficient or transient p53 expression, because FGNRp53-infected cells growth arrested in G1, induced Bax, and underwent apoptosis at an increased rate after prodrug treatment, particularly when the adenovirus E1A protein was present. Intratumoral injection of FGNRp53 concomitant with single or double pro-drug therapy resulted in a tumor growth delay that was equal to or less than that observed with the FGNR virus. Our results indicate that coexpression of p53 may not necessarily improve the efficacy of adenovirus-mediated CD/ 5-FC and HSV-1 TK/GCV suicide gene therapies in vivo.     

肿瘤厌氧靶向双自杀基因治疗系统pTRKH2-PsT/CD、pTRKH2-PsT/UPRT的构建

目的 利用婴儿双歧杆菌对实体瘤低氧区的靶向效应,构建肿瘤厌氧靶向双自杀基因治疗系统pTRKH2-PsT /CD和pTRKH2-PsT /UPRT。方法 用PCR的方法从质粒pGEX/CD和pGEX/UPRT中扩增出CD基因和UPRT基因,双酶切CD基因、UPRT基因和质粒pTRKH2-PsT,分别连接后重组于大肠杆菌中。之后用电转化的方法将重组质粒转入婴儿双歧杆菌中。用RT-PCR检测该系统mRNA水平的表达,SDS-PAGE检测该系统在蛋白质水平的表达。在黑色素瘤B16-F10细胞上检测该系统的体外肿瘤细胞杀伤效果。结果 成功地将CD基因和UPRT基因转入了质粒pTRKH2-PsT,CD基因和UPRT基因的测序结果表明序列与Genebank公布的序列一致。RT-PCR检测到CD和UPRT mRNA水平的明显表达。在含有CD基因的婴儿双歧杆菌细胞全蛋白中发现了CD蛋白质的表达,在含有UPRT基因的婴儿双歧杆菌上清液中发现了UPRT蛋白质的表达。黑色素瘤细胞的低存活率证明了pTRKH2-PsT/CD、pTRKH2-PsT/UPRT自杀基因治疗系统对黑色素瘤的显著杀伤作用。结论 肿瘤厌氧靶向双自杀基因治疗系统pTRKH2-PsT/CD、pTRKH2-PsT/UPRT构建成功并显示出杀伤肿瘤细胞的作用。     

Carcinoembryonic antigen-specific suicide gene therapy of cytosine deaminase/5-fluorocytosine enhanced by the cre/loxP system in the orthotopic gastric carcinoma model

Tumor-specific gene delivery is crucial to achieving successful effects in suicide gene therapy. Carcinoembryonic antigen (CEA) promoter has been widely used for this purpose, but the expression level of tumor-specific promoters such as CEA promoter is generally low. In the previous study, we used the Cre/loxP system and showed that LacZ expression by the CEA promoter was remarkably enhanced and maintained its specificity using the Cre/loxP regulation system. In this study, the Cre/loxP system was first applied to augmentation of selective expression of the cytosine deaminase (CD) gene as a suicide gene therapy in CEA-producing cells. The double infection with AxCEANCre expressing Cre recombinase under the control of the CEA promoter and AxCALNLCD expressing the CD gene under the control of the CAG promoter by the Cre switching system rendered CEA-producing tumor cells 13-fold more sensitive to 5-fluorocytosine (5-FC) compared with the single infection with AxCEACD expressing CD gene driven by the CEA promoter. The therapeutic efficacy of the enhanced CD/5-FC suicide gene therapy was evaluated in orthotopic implantation models of human gastric carcinoma. Adenovirus vectors (1 x 10(9) plaque-forming units) were administered i.p. into mice three times, and then 5-FC was administered i.p. for the next 10 days. Tumor volume and weight in mice treated with AxCEANCre and AxCALNLCD/5-FC were significantly reduced as compared with those in mice treated not only with Mock (AxCALacZ) but also with AxCEACD/5-FC (P < 0.0001). This beneficial effect on tumor burden was also reflected in the overall survival. The survival periods of the mice treated with AxCEANCre and AxCALNLCD/5-FC were longer than those of mice treated with Mock or AxCEACD/5-FC (P < 0.01). These results suggested that application of the Cre/loxP system could provide a new approach for enhanced selective suicide gene therapy of CD/5-FC for the treatment of advanced gastric carcinoma.     

慢病毒携带的双自杀基因对淋巴瘤细胞杀伤作用的实验研究

背景与目的:慢病毒载体具有可感染非分裂细胞、目的基因整合至靶细胞基因组长期表达、免疫原性低等优点,适于体内基因治疗。本研究探讨慢病毒介导的双自杀基因对淋巴瘤细胞Raji的杀伤作用。方法:将表达慢病毒的3种质粒,即包装结构基因质粒pCMVΔ8.2、包膜基因质粒pCMV.VSVG、目的基因质粒pHR'CS.GFP或pHR'CS.CDglytk分两组(pHR'CS.Cdglytk为实验组、pHR'CS.GFP为对照组),经脂质体导入病毒包装细胞293T,包装成病毒后,收集病毒上清,浓缩后转染Raji细胞,用荧光显微镜及RT-PCR检测基因的表达。给予前体药物5-氟胞嘧啶(5-FC)和/或无环鸟苷(GCV),用MTT法测定Raji细胞的生长抑制率,检测CD和HSV-tk双自杀基因对Raji细胞的作用。结果:表达慢病毒的3种质粒可高效转染入293T细胞。荧光显微镜下观察可见大量的绿色荧光,透射电镜下观察可见富集的病毒颗粒。慢病毒介导的双自杀基因在Raji细胞中高效、稳定表达。单独使用GCV或5-FC对细胞的生长抑制率分别为51%、50%,与未转染组Raji细胞比较,差异有显著性(P<0.01);联合使用5-FC和GCV对细胞的生长抑制率为73%,明显高于单独使用5-FC或GCV(P<0.01)。结论:慢病毒介导的双自杀基因可高效稳定转染淋巴瘤细胞;双自杀基因系统较单一自杀基因系统(CD/5-FC或HSVtk/GCV)对淋巴瘤细