人内皮型一氧化氮合成酶基因重组腺病毒载体构建及其在人血管平滑肌细胞的表达

目的 利用AdMax腺病毒载体系统构建人内皮型一氧化氮合成酶基因(heNOS)重组腺病毒并检测其在体外培养人血管平滑肌细胞中表达.方法 将质粒PMSCV-heNOS通过聚合酶链反应(PCR)法扩增出heNOS全长基因,插入PSUCMV中构建成腺病毒穿梭质粒PSUCMV-heNOS,转化DH5α大肠杆菌,挑选细菌单克隆进行DNA测序,酶切鉴定正确;通过PSUCMV-heNOS与质粒pBHGE3在293细胞中同源重组,得到携带heNOS基因的复制缺陷型重组腺病毒载体(AdCMV-he-NOS).转染体外培养的人血管平滑肌细胞,MTT检测细胞增殖,用免疫组织化学和Western blot等方法检测heNOS蛋白的表达.结果 (1)PCR产物电泳结果,酶切鉴定和测序鉴定结果证实构建人eNOS重组腺病毒载体成功,病毒滴度达3.5×l010PFU/ml;(2)根据体外培养的人血管平滑肌细胞(HVSMCs)形态学变化,免疫组织化学进行平滑肌细胞表型标志物α-actin染色,证实为HVSMCs;(3)转染120 h,AdCMV-heNOS病毒感染复数(MOI)分别为50、150、250、300、450、A570值分别为1.410±0.081、1.357±0.150、1.303±0.311、0.995±0.248、0.731±0.101,其中感染复数300明显稳定抑制血管平滑肌细胞的增殖,差异有统计学意义(P＜0.01).免疫组织化学和Western blot检测显示转染细胞heNOS蛋白明显表达.结论 heNOS重组腺病毒的构建及其表达为血管内膜增生等疾病的基因治疗提供可能.

Abstract：

Objective To construct recombinant adenovirus vector carrying the human endothelial nitric oxide synthase gene (heNOS) and detect its expression in human vascular smooth muscle cells in vitro. Methods heNOS was cloned by polymerase chain reaction (PCR) using plasmid PMSCV-heNOS,heNOS cDNA was inserted into adenovirus shuttle plasmid-PSUCMV to generate a recombinant plasmid PSUCMV-heNOS, transfected into E. coli DH5α, and positive clones were correctly constructed and confirmed by DNA sequencing analysis and restriction endonucleas analysis. The plasmid PSUCMV-heNOS was co-transfected with pBHGE3 in 293 cells to generate replication-defective recombinant adenovirus vector carrying heNOS gene. Human vascular smooth muscle cells were transfected by Ad-heNOS. The effect on the proliferation of human vascular smooth muscle cells was investigated by MTT assay. The expression of heNOS was detected by immunohistochemistry staining and Western blotting. Results ( 1 ) PCR, restrictive digestion, and sequencing revealed the successful construction of the recombinant adenovirus vector carrying heNOS gene and its titer was 3.5 × 1010 PFU/ml; (2) It was confirmed that the human vascular smooth muscle cells cultivated in vitro were characterized by morphology and immunohistochemistry strain of α-actin; (3) At 120 h, the A570 values in multiplicity of infection (MOI) 50, 150,250,300,450 were respectively 1. 410 ±0. 081, 1. 357 ±0. 150, 1.303 ±0. 311,0. 995 ±0. 248 and 0. 731 ±0. 101. The proliferation of human vascular smooth muscle cells was significantly and stably inhibited with MOI 300 of AdCMVheNOS ( P ＜ 0. 01 ). Immunostaining and Western blotting with heNOS in engineered cells were positive.Conclusion The successful construction of AdCMV-heNOS and expression may provide an opportunity for the gene therapy of vascular intimal hyperplasia.     

靶向RNA干扰骨桥蛋白基因的慢病毒载体对血管平滑肌细胞增殖凋亡的影响

目的 构建大鼠骨桥蛋白(OPN)基因的shRNA慢病毒表达载体,并观察其对大鼠血管平滑肌细胞(VSMC)增殖和凋亡的影响.方法 针对OPN基因的不同部位设计3对shRNA的寡核苷酸片段,克隆到慢病毒载体PLKO.1中,构建靶向OPN基因的慢病毒载体PLKO.1-OPN-shRNA,检测并筛选最佳抑制效率的shRNA干扰载体.并将其转染大鼠血管平滑肌细胞,用逆转录-聚合酶链反应(RT-PCR)检测VSMCs OPN mRNA表达水平;蛋白免疫印迹法(Western blot)检测VSMC OPN蛋白表达水平;噻唑蓝(MTT)比色法和流式细胞仪检测沉默OPN基因后对VSMC增殖和凋亡能力的影响.结果 靶向OPN慢病毒表达载体构建成功.重组慢病毒载体PLKO.1-OPN-shRNA转染后可显著抑制VSMCs的OPN mRNA及蛋白的表达水平,OPN蛋白表达明显下降,其中以PLKO.1-OPN2-shRNA最为明显,达到90％以上;转染PLKO.1-OPN2-shRNA后72 h的细胞增殖能力[吸光度(A)值=0.365 ±0.011]明显低于未处理组(A值=0.941±0.028)和阴性对照组细胞(A值=0.941±0.040,P＜0.05);而早期细胞凋亡率(20.44±2.69)％和晚期细胞凋亡率(16.79±1.01)％均明显高于未转染组和阴性对照组(P＜0.01).结论 成功构建并筛选最佳抑制效率的靶向OPN慢病毒表达载体PLKO.1-OPN2-shRNA,该载体能有效抑制大鼠血管平滑肌细胞增殖,并促进细胞凋亡.     

HCCR-2反义核酸对肝癌HepG2细胞的作用

Objective To investigate the effects of antisense recombinant euraryotic expression vector of HCCR-2 on the proliferation and apoptosis of HepG2. Methods The antisense recombinant eukaryotic expression vector of HCCR-2 was constructed. The vector was stably transfected to the HepG2 cells, and positive clones were selected by G418 (antiseuse vector group), pIRES2-EGFP vector was transfected into the HepG2 cells in the same way (pIRES2-EGFP group). The conditions of the nontransfected HepG2 cells were used as control (HepG2 group). Changes in cell growth curve, cell cycle, cell apoptosis and morphology of HepG2 cells after the transfec-tion were detected by MTT method, flow cytometry and transmission electron microscopy, respectively. All the data were analyzed by one-way ANOVA and chi-square test. Results The expression level of HCCR-2 mRNA was down-regulated to 0.39±0.04 in antisense vector group, and the expression level of HCCR-2 mRNA in pIRES2-EGFP group and HepG2 group were 0.62±0.06 and 0.72±0.03, respectively, with significant difference among the 3 groups (F=43.701, P<0.05). The apoptotic rate of HepG2 cells in antisense vector group, pIRES2-EGFP grop and HepG2 group were 13.30%, 2.51% and 2.07%, respectively, with significant difference among the 3 group (χ2=6.793, 8.721, P<0.05). The growth of HepG2 cells in antisense vector group was retarded, and was blocked in G0/G1 stage. Conclusions The HCCR-2 antisense recombinant eukaryotic expression vector can inhibit the mRNA expression of HCCR-2 and promote the apoptosis of cells. HCCR-2 may be involved in cell regulation and the proliferation of hepatocellular carcinoma cells.     

HCCR-2反义核酸对肝癌HepG2细胞的作用

Objective To investigate the effects of antisense recombinant euraryotic expression vector of HCCR-2 on the proliferation and apoptosis of HepG2. Methods The antisense recombinant eukaryotic expression vector of HCCR-2 was constructed. The vector was stably transfected to the HepG2 cells, and positive clones were selected by G418 (antiseuse vector group), pIRES2-EGFP vector was transfected into the HepG2 cells in the same way (pIRES2-EGFP group). The conditions of the nontransfected HepG2 cells were used as control (HepG2 group). Changes in cell growth curve, cell cycle, cell apoptosis and morphology of HepG2 cells after the transfec-tion were detected by MTT method, flow cytometry and transmission electron microscopy, respectively. All the data were analyzed by one-way ANOVA and chi-square test. Results The expression level of HCCR-2 mRNA was down-regulated to 0.39±0.04 in antisense vector group, and the expression level of HCCR-2 mRNA in pIRES2-EGFP group and HepG2 group were 0.62±0.06 and 0.72±0.03, respectively, with significant difference among the 3 groups (F=43.701, P<0.05). The apoptotic rate of HepG2 cells in antisense vector group, pIRES2-EGFP grop and HepG2 group were 13.30%, 2.51% and 2.07%, respectively, with significant difference among the 3 group (χ2=6.793, 8.721, P<0.05). The growth of HepG2 cells in antisense vector group was retarded, and was blocked in G0/G1 stage. Conclusions The HCCR-2 antisense recombinant eukaryotic expression vector can inhibit the mRNA expression of HCCR-2 and promote the apoptosis of cells. HCCR-2 may be involved in cell regulation and the proliferation of hepatocellular carcinoma cells.     

HCCR-2反义核酸对肝癌HepG2细胞的作用

Objective To investigate the effects of antisense recombinant euraryotic expression vector of HCCR-2 on the proliferation and apoptosis of HepG2. Methods The antisense recombinant eukaryotic expression vector of HCCR-2 was constructed. The vector was stably transfected to the HepG2 cells, and positive clones were selected by G418 (antiseuse vector group), pIRES2-EGFP vector was transfected into the HepG2 cells in the same way (pIRES2-EGFP group). The conditions of the nontransfected HepG2 cells were used as control (HepG2 group). Changes in cell growth curve, cell cycle, cell apoptosis and morphology of HepG2 cells after the transfec-tion were detected by MTT method, flow cytometry and transmission electron microscopy, respectively. All the data were analyzed by one-way ANOVA and chi-square test. Results The expression level of HCCR-2 mRNA was down-regulated to 0.39±0.04 in antisense vector group, and the expression level of HCCR-2 mRNA in pIRES2-EGFP group and HepG2 group were 0.62±0.06 and 0.72±0.03, respectively, with significant difference among the 3 groups (F=43.701, P<0.05). The apoptotic rate of HepG2 cells in antisense vector group, pIRES2-EGFP grop and HepG2 group were 13.30%, 2.51% and 2.07%, respectively, with significant difference among the 3 group (χ2=6.793, 8.721, P<0.05). The growth of HepG2 cells in antisense vector group was retarded, and was blocked in G0/G1 stage. Conclusions The HCCR-2 antisense recombinant eukaryotic expression vector can inhibit the mRNA expression of HCCR-2 and promote the apoptosis of cells. HCCR-2 may be involved in cell regulation and the proliferation of hepatocellular carcinoma cells.     

HCCR-2反义核酸对肝癌HepG2细胞的作用

Objective To investigate the effects of antisense recombinant euraryotic expression vector of HCCR-2 on the proliferation and apoptosis of HepG2. Methods The antisense recombinant eukaryotic expression vector of HCCR-2 was constructed. The vector was stably transfected to the HepG2 cells, and positive clones were selected by G418 (antiseuse vector group), pIRES2-EGFP vector was transfected into the HepG2 cells in the same way (pIRES2-EGFP group). The conditions of the nontransfected HepG2 cells were used as control (HepG2 group). Changes in cell growth curve, cell cycle, cell apoptosis and morphology of HepG2 cells after the transfec-tion were detected by MTT method, flow cytometry and transmission electron microscopy, respectively. All the data were analyzed by one-way ANOVA and chi-square test. Results The expression level of HCCR-2 mRNA was down-regulated to 0.39±0.04 in antisense vector group, and the expression level of HCCR-2 mRNA in pIRES2-EGFP group and HepG2 group were 0.62±0.06 and 0.72±0.03, respectively, with significant difference among the 3 groups (F=43.701, P<0.05). The apoptotic rate of HepG2 cells in antisense vector group, pIRES2-EGFP grop and HepG2 group were 13.30%, 2.51% and 2.07%, respectively, with significant difference among the 3 group (χ2=6.793, 8.721, P<0.05). The growth of HepG2 cells in antisense vector group was retarded, and was blocked in G0/G1 stage. Conclusions The HCCR-2 antisense recombinant eukaryotic expression vector can inhibit the mRNA expression of HCCR-2 and promote the apoptosis of cells. HCCR-2 may be involved in cell regulation and the proliferation of hepatocellular carcinoma cells.     

HCCR-2反义核酸对肝癌HepG2细胞的作用

Objective To investigate the effects of antisense recombinant euraryotic expression vector of HCCR-2 on the proliferation and apoptosis of HepG2. Methods The antisense recombinant eukaryotic expression vector of HCCR-2 was constructed. The vector was stably transfected to the HepG2 cells, and positive clones were selected by G418 (antiseuse vector group), pIRES2-EGFP vector was transfected into the HepG2 cells in the same way (pIRES2-EGFP group). The conditions of the nontransfected HepG2 cells were used as control (HepG2 group). Changes in cell growth curve, cell cycle, cell apoptosis and morphology of HepG2 cells after the transfec-tion were detected by MTT method, flow cytometry and transmission electron microscopy, respectively. All the data were analyzed by one-way ANOVA and chi-square test. Results The expression level of HCCR-2 mRNA was down-regulated to 0.39±0.04 in antisense vector group, and the expression level of HCCR-2 mRNA in pIRES2-EGFP group and HepG2 group were 0.62±0.06 and 0.72±0.03, respectively, with significant difference among the 3 groups (F=43.701, P<0.05). The apoptotic rate of HepG2 cells in antisense vector group, pIRES2-EGFP grop and HepG2 group were 13.30%, 2.51% and 2.07%, respectively, with significant difference among the 3 group (χ2=6.793, 8.721, P<0.05). The growth of HepG2 cells in antisense vector group was retarded, and was blocked in G0/G1 stage. Conclusions The HCCR-2 antisense recombinant eukaryotic expression vector can inhibit the mRNA expression of HCCR-2 and promote the apoptosis of cells. HCCR-2 may be involved in cell regulation and the proliferation of hepatocellular carcinoma cells.     

慢病毒介导的RNA干扰对小鼠胰腺星状细胞中半乳糖凝集素-1基因沉默效应的研究

目的:评价慢病毒介导的RNA干扰技术对小鼠胰腺星状细胞(mPSC)中半乳糖凝集素-1(galectin-1)基因的沉默效应,并观察其对mPSC增殖的影响。方法:设计并合成3条galectin-1基因特异性RNAi靶序列,构建到慢病毒PLKO.1-PURO载体中。从慢病毒包装转染的293T细胞,获得病毒上清感染的mPSC;采用嘌呤霉素(2μg/μL)筛选出慢病毒感染成功的mPSC。实时荧光定量RT-PCR和Western印迹法检测mPSC中galectin-1 mRNA和蛋白的表达,MTT法检测mPSC的增值能力。结果:PCR扩增和测序表明成功构建galectin-1慢病毒干扰载体,可以有效沉默mPSC中galectin-1基因的表达。构建的RNAi慢病毒载体感染mPSC后galectin-1 mRNA表达量同对照组比较,分别为(19.4±4.8)%、(6.2±4.3)%、(27.6±5.7)%,galectin-1蛋白表达量同对照组比较分别为(25.9±3.6)%、(10.8±4.1)%、(30.2±3.2)%。稳定的galectin-1沉默mPSC在第4天细胞增殖能力下降(22.9±2.7)%(P     

短发夹RNA对大鼠阴茎海绵体平滑肌细胞磷酸二酯酶5型基因表达的抑制作用

目的 观察短发夹RNA(shRNA)对大鼠阴茎海绵体平滑肌细胞磷酸二酯酶5型(PDE5)基因表达的抑制作用,探讨运用RNA干扰(RNAi)技术治疗勃起功能障碍(ED)的可行性.方法 构建靶向大鼠PDE5基因的shRNA重组腺病毒rAd-rPDE5-shRNA,将其转染大鼠阴茎海绵体平滑肌细胞48 h后,通过荧光标签进行显微计数确定转染效率,并以逆转录-聚合酶链反应(RT-PCR)及Western blot检测PDE5基因的表达水平.结果 rAd-rPDE5-shRNA构建成功,转染大鼠阴茎海绵体平滑肌细胞效率达95%以上,并使PDE5基因表达在mRNA水平抑制(80.78±2.30)%,在蛋白水平抑制(67.39±3.33)%.结论 以腺病毒为载体表达的shRNA能稳定、有效地抑制大鼠阴茎海绵体平滑肌细胞PDE5基因的表达.     

人胸腺素β4 RNA干扰载体的构建及其对293T细胞目的基因表达的影响

目的探讨人胸腺素β4（thymosin β4,TMSB4）基因RNA干扰慢病毒载体的构建,观察病毒感染293T细胞后TMSB4 mRNA和蛋白表达,为进一步研究TMSB4基因的功能提供基础。方法设计特异性干扰人TMSB4基因的小发卡RNA序列,合成含有干扰序列的双链DNAoligo,与经AgeI和EcoRI双酶切后的pGCSIL-GFP载体连接产生慢病毒载体。转化感受态大肠杆菌DH5a并对阳性克隆进行PCR扩增测序鉴定。慢病毒载体、包装系统质粒共转染包装细胞293T细胞,产生慢病毒颗粒并测定病毒滴度。将获得的慢病毒感染293T细胞,分别采用实时定量PCR和免疫细胞化学染色方法观察TMSB4 mRNA和蛋白的表达情况,利用生成的TMSB4 shRNA慢病毒感染原代成纤维细胞。结果感染重组慢病毒的293T细胞与空病毒转染阴性对照细胞的TMSB4 mRNA表达分别为0.56±0.11和1.00±0.06（P=0.0006）,实验组细胞的敲减率为44%。实验组TMSB4蛋白表达水平0.042±0.007比阴性对照组细胞0.093±0.009的表达降低55%（H=461.342,P〈0.001）。感染重组慢病毒的原代培养的成纤维细胞与空病毒转染的对照细胞相比,TMSB4蛋白表达水平亦明显降低。结论TMSB4基因干扰慢病毒构建成功并能显著降低TMSB4基因和蛋白在293T细胞中的表达,成功感染原代成纤维细胞使其目的基因蛋白减少,为进一步研究TMSB4基因的功能奠定研究基础。     

慢病毒介导的NOB1基因沉默对人结肠癌细胞增殖及凋亡的影响

目的探讨RNA干扰技术沉默人NOB1基因对人结肠癌RKO细胞增殖和凋亡的影响。方法设计靶向NOB1基因的小干扰RNA（siRNA）,构建NOB1基因特异性的RNA干扰慢病毒载体,感染RKO细胞,并设置阴性对照组。实时定量PCR和Westemblot分别检测两组细胞NOB1mRNA及蛋白的表达情况;CellomicsArrayScanVTIHCS高内涵分析仪检测感染细胞的增殖和克隆形成能力;流式细胞术检测细胞周期及凋亡的变化：裸鼠成瘤实验检测0NOB1-siRNA对肿瘤的抑制作用。结果NOB1-shRNA慢病毒感染RKO细胞3d后．与阴性对照组比较．NOB1mRNA和蛋白的表达明显降低,克隆形成数减少,而细胞凋亡数增加（均P〈0．05）。裸鼠成瘤实验结果显示,NOB1．shRNA感染组裸鼠移植瘤体积为（405±102）mm3,小于阴性对照组的（870±165）mm3（P〈0．05）。结论通过RNA干扰方式沉默NOB1基因的表达．有望作为抑制结肠癌发展的有效手段。     

热休克蛋白70-2基因沉默诱导大鼠精原细胞凋亡及其机制

目的 探讨热休克蛋白(HSP)70-2基因沉默对精原细胞的影响及其机制.方法 构建HSP70-2特异的短发夹RNA(shRNA)质粒载体,并转染大鼠精原细胞;应用逆转录-聚合酶链反应(RT-PCR)检测HSP70-2 mRNA表达,Western blot检测HSP70-2、Cyclin DI、bcl-2和box蛋白表达,应用流式细胞术分析细胞周期和凋亡.结果 HSP70-2基因沉默组的HSP70-2蛋白表达量为0.93±0.13,明显低于阴性对照组1.31±0.10(P<0.01);流式细胞术检测结果显示,与转染Scrambled的阴性对照组比较,转染pGenesil-1-HSP70-2重组质粒组的PC3细胞在G1期出现明显细胞周期阻滞和细胞凋亡,G1期阻滞细胞比例为(80.09±2.37)%,凋亡率为(7.44±2.41)%,而阴性对照组分别为(61.85±2.31)%和(1.09±0.57)%(P<0.05).与阴性对照组比较,转染后细胞bcl-2、Cyclin D1表达水平显著降低,而bax表达水平升高.结论 HSP70-2基因沉默能诱导精原细胞凋亡,其机制可能是通过Cyclin D1蛋白调节细胞周期并通过上调box蛋白表达促进细胞凋亡.     

沉默胰岛素样生长因子1类受体基因对胰腺癌细胞吉西他滨化疗敏感性的影响

目的 应用慢病毒介导的RNA干扰(RNAi)技术建立稳定低表达胰岛素样生长因子1类受体(IGF1R)基因的人胰腺癌Panc-1细胞株,并观察其对吉西他滨化疗敏感性的影响.方法 设计并合成3条针对IGF1R基因特异性的RNA干扰靶点,构建慢病毒pFU-GW-RNAi载体,经包装后转染293T细胞,获得病毒上清并测定其相应滴度;感染Panc-1细胞,通过实时定量聚合酶链反应(real-time PCR)鉴定RNA干扰效率;筛选出基因沉默效率最高的慢病毒感染人胰腺癌Panc-1细胞,获得稳定转染细胞株.噻唑蓝(MTT)比色法检测干扰IGF1R后Panc-1细胞对吉西他滨敏感性的变化.裸鼠移植瘤模型检测干扰IGF1R前后体内成瘤能力及吉西他滨对移植瘤生长的抑制作用.结果 在Panc-1细胞中成功建立低表达IGF1R基因的细胞株,吉西他滨对Panc-1细胞的半数抑制剂量(IC50)从(0.774±0.001)mg/L下降到(0.330±0.003)mg/L,Panc-1细胞对吉西他滨的敏感性增加了2.35倍.裸鼠移植瘤模型中,干扰IGF1R基因后皮下种植瘤生长缓慢,联合应用吉西他滨后对肿瘤生长的抑制作用进一步增加.结论 慢病毒介导的RNA干扰技术特异性沉默IGF1R基因,能显著增强胰腺癌细胞株Panc-1对吉西他滨的敏感性.

Abstract：

Objective To construct the lentiviral expression vector for RNA interference of insulin like growth factor-1 receptor (IGF1R) gene in human pancreatic cancer cells and to evaluate its effect on chemosensitivity to gemcitabine.Methods Three sequences of RNA interference targeting IGF1R gene were designed, synthesized and cloned into the pFU-GW-RNAi vector. After transfection of 293T cells with lentiviral vector, the lentivirus was produced and the titer of virus was tested. Panc-1 cells were infected with the lentivirus and the expression of IGF1R mRNA in Panc-1 cells was detected by real-time quantitative polymerase chain reaction (PCR). The changes of gemcitabine sensitivity after RNA interference were examined by methyl thiazol tetrazolium (MTT) assay. In vivo nude mice tumorigenicity model was used to determine the effect of RNA interference targeting IGF1R gene combined with or without gemcitabine on growth inhibition of xenograft tumors.Results A recombinant lentiviral vector expressing shRNA against IGF1R gene was obtained. After RNA interference, the median inhibition concentration (IC50) of gemcitabine against Panc-1 cells was reduced from (0.774±0.001) mg/L to (0.330±0.003) mg/L, indicating that the sensitivity to gemcitabine was increased by 2.35 times after interference. In vivo xenograft formation assay resulted in a significant growth-inhibiting effect by IGF1R RNA interference. Furthermore, the RNA interference targeting IGF1R gene enhanced the antiproliferative effect of gemcitabine on nude mice xenografts.Conclusion The sensitivity of Panc-1 cells to gemcitabine could be enhanced by RNA interference targeting IGF1R gene.     

携带ROCK2基因siRNA有效片段的慢病毒载体的筛选

目的:筛选能够显著抑制自发性高血压大鼠(SHR)阴茎海绵体平滑肌细胞内ROCK2基因表达的携带ROCK2基因siRNA的慢病毒载体。方法:设计并合成4个靶向ROCK2的siRNA片段,构建并包装成慢病毒载体。随机将5只SHR阴茎海绵体平滑肌细胞分为6组,每组每个样本3×104个细胞,每组5个样本,分别为:A组(未转染对照组)、B组(携带慢病毒转染组)、C~F组(分别携带靶向ROCK2基因siRNA 1~4号靶点的慢病毒转染组),以感染复(MOI)=80转染SHR阴茎海绵体平滑肌细胞,转染后48 h荧光显微镜下观察细胞GFP表达情况,并用RT-PCR检测各组被转染细胞ROCK2 mRNA的表达。结果:荧光显微镜下观察各组细胞转染效率均50%。与A组相比,B组ROCK2 mRNA的表达无明显改变(P﹥0.05);C、D、F组SHR阴茎海绵体平滑肌细胞ROCK2基因mRNA的表达较A组极显著下降(P0.01),抑制效率分别达到(43.91±8.19)%、(47.15±6.64)%、(25.7±6.03)%;E组SHR阴茎海绵体平滑肌细胞ROCK2基因mRNA的表达较A组显著下降(P0.05),抑制效率为(16.81±5.94)%。结论:本研究构建的4种携带ROCK2基因的siRNA慢病毒载体均能够显著抑制SHR阴茎海绵体平滑肌细胞内ROCK2基因的表达,其中有1种慢病毒载体抑制作用最强。     

shRNA慢病毒表达载体对人结肠癌细胞CXCR7表达的影响

目的 探讨CXCR7的shRNA慢病毒表达载体对人结肠癌细胞HT-29 CXCR7表达的影响.方法 设计CXCR7的3条siRNA的靶点序列,合成含干扰序列的双链DNA发卡结构shRNA,分别与双酶切后的plVTHM载体连接,构建3种重组穿梭质粒plVTHM shRNA1,plVTHM shRNA2和plVTHM shR-NA3,并转化于DH5α感受态细胞,Amp筛选阳性克隆,抽取质粒行酶切鉴定并测序.分别将3种重组质粒与慢病毒包装质粒共转染293T细胞,生产慢病毒颗粒,并检测病毒滴度.将3种重组慢病毒及阴性对照病毒分别感染人结肠癌细胞HT-29,实时定量PCR和Western blot分别检测CXCR7 mRNA和蛋白的沉默效果.结果 酶切鉴定及测序结果 证实3种慢病毒载体均包装成功,滴度分别为6×107 TU/mL,4×107 TU/mL和5×107 TU/mL.感染HT-29后,CXCR7 mRNA及蛋白的表达量均较阴性对照组和未感染组明显降低(P＜0.05);其中以LV-CXCR7 shRNA-2和LV-CXCR7 shRNA-3作用显著,mRNA表达分别下调72%和67%,蛋白表达下调68%和55%(P＜0.05);而阴性感染对照组和未感染组相比差异无统计学意义(P＞0.05)结论 成功构建了3种CXCR7 shRNA慢病毒表达,可有效下调HT-29细胞CXCR7mRNA和蛋白的表达,其为进一步研究以CXCR7为靶点的结肠癌基因治疗提供稳定转染细胞的载体奠定基础.     

慢病毒介导shRNA沉默STAT3表达治疗结直肠癌的体内外研究

目的 探讨慢病毒介导shRNA沉默STAT3表达对结直肠癌生长的影响.方法 分别用慢病毒干扰质粒pRNAT-shSTAT3、慢病毒空质粒pRNAT-GFP和慢病毒包装质粒混合物共转染293T细胞,获得慢病毒分别感染结直肠癌HT-29细胞,筛选培养后获得HT-29-shSTAT3、HT-29-GFP细胞株.将3种细胞株用于建立裸鼠皮下移植瘤模型,分为3组:第1组为HT-29组,第2组为HT-29-GFP组,第3组为HT-29-shSTAT3组,每组5只.MTT法检测细胞生长情况,流式细胞仪检测细胞周期变化,取瘤组织切片行CD34免疫组织化学观察肿瘤微血管密度(MVD)的变化.应用单因素方差分析检测结果.结果 结直肠癌HT-29、HT-29-GFP细胞株生长能力明显强于HT-29-shSTAT3细胞株,3者比较,差异有统计学意义(F=632.50,P<0.05).HT-29-shSTAT3细胞株生长明显减慢,G0/G1期细胞占68.7%±2.9%,HT-29-GFP细胞株为38.5%±1.6%,HT-29细胞株为38.7%±2.3%;3者比较,差异有统计学意义(F=166.53,P<0.05).HT-29组、HT-29-GFP组和HT-29-sh STAT3组MVD分别为29±5、28±4、10±3,3组比较,差异有统计学意义(F=31.60,P<0.05).结论 慢病毒介导的shRNA沉默STAT3表达能明显抑制结直肠癌的生长.