高表达蛋白hSav1对人胚肾HEK293增殖能力的影响

Objective To elucidate the effects of human Salvador 1 (hSav1 ) on cell proliferation of human embryonic kidney cell line HEK293. Methods The plasmid CFP-N1-hSav1 was constructed and transfected into HEK293 cells with lipofectamine 2000. The transfection efficiency was detected by fluorescent microscopy. The effects of hSav1 on cell proliferation were measured by MTT and BrdU incorporation. Results The transfection efficiency was about 70% -80%. The MTT results showed that the inhibition rate of cell proliferation in transfected group at the 12th, 24th, 36th, and 48th h was 2% , 5% , 15% , and 23% , respectively;while that in the control group was 2% , 3% , 2% , and 2% respectively. The BrdU incorporation revealed that the BrdU incorporation rate in transfected group (12. 9 ±5. 3)% was significantly lower than in control group (27.3±3.8)% (P<0.05). Conclusion hSav1 is a newly identified protein that can cause cell proliferation inhibition in HEK293 cells.     

高表达蛋白hSav1对人胚肾HEK293增殖能力的影响

Objective To elucidate the effects of human Salvador 1 (hSav1 ) on cell proliferation of human embryonic kidney cell line HEK293. Methods The plasmid CFP-N1-hSav1 was constructed and transfected into HEK293 cells with lipofectamine 2000. The transfection efficiency was detected by fluorescent microscopy. The effects of hSav1 on cell proliferation were measured by MTT and BrdU incorporation. Results The transfection efficiency was about 70% -80%. The MTT results showed that the inhibition rate of cell proliferation in transfected group at the 12th, 24th, 36th, and 48th h was 2% , 5% , 15% , and 23% , respectively;while that in the control group was 2% , 3% , 2% , and 2% respectively. The BrdU incorporation revealed that the BrdU incorporation rate in transfected group (12. 9 ±5. 3)% was significantly lower than in control group (27.3±3.8)% (P<0.05). Conclusion hSav1 is a newly identified protein that can cause cell proliferation inhibition in HEK293 cells.     

甲状旁腺素通过磷脂酶C非依赖途径激活蛋白激酶C

目的利用基于荧光共振能量转移(Fluorescence resonance energy transfer,FRET)技术的检测PKC激活或PKC-delta激活的报告分子来确定PTH是否可以通过PLC非依赖途径激活PKC和PKC-delta。方法将表达PKC激活报告分子(CKAR)的质粒和表达PKC-delta激活报告分子的质粒转染HEK293细胞,培养72h后通过共聚焦显微镜检测FRET的改变,并以此判断佛波酯(TPA)是否激活PKC和PKC-delta。将表达甲状旁腺素1型受体(PTHR1)的质粒与CKAR质粒或PKC-delta质粒共转染HEK293细胞,培养72h后通过共聚焦显微镜检测FRET的改变,并判断PTH(1-34)、G1R19(1-34)和0.1%的三氟乙酸(TFA)对PKC和PKC-delta的作用。结果在转染CKAR质粒或PKC-delta质粒的HEK293细胞,TPA均使青色荧光与黄色荧光的强度之比(C/Y)增加。在共转染PTH1R质粒与CKAR质粒或PKC-delta质粒的HEK293细胞,PTH(1-34)和G1R19(1-34)均增加了C/Y的值,而0.1%TFA未引起C/Y的改变。结论 PTH与PTHR1结合后通过PLC非依赖途径激活PKC/PKC-delta。     

体外瞬时转染TIMP-1基因促进成纤维细胞增殖

目的：探讨体外瞬时转染组织型金属蛋白酶抑制剂1（TIMP-1）质粒对小鼠成纤维细胞细胞周期和增殖的影响。方法：构建表达小鼠TIMP-1的质粒，体外转染小鼠成纤维细胞NIH3T3,以转染空质粒的NIH3T3细胞作对照，采用RT—PCR和westem印迹分析检测TIMP—1在基因和蛋白质水平的表达；采用BrdU法和MTT法检测细胞增殖能力和活力；流式细胞仪检测细胞周期的变化。结果：转染TIMP-1质粒的NIH3T3细胞在24h即有明显的TIMP-1mRNA表达和蛋白质表达上调；与转染空质粒的NIH3T3细胞相比，转染TIMP-1质粒的NI心L细胞48h的BrdU摄取率显著升高（P〈0．01），72h的m摄取率显著升高（P〈0．05）。流式细胞仪检测结果显示与转染空质粒的细胞相比，72h时TIMP-1质粒转染组G0／G1期细胞显著减少（P〈0．01），s期细胞比例显著升高（P〈0．01）。结论：体外瞬时转染TIMP-1质粒可以有效地使TIMP-1的基因和蛋白质水平在NIH3T3细胞高表达，TIMP-1高表达显著提高细胞BrdU和MTT摄取率，减少G0／（31期细胞比例，提高s期细胞比例，提示TIMP—1高表达能够促进戍纤维细胞增殖，从而加速间质纤维化的进程。     

EPHX2基因过表达质粒的构建及意义探讨

目的：构建LETO、OLETF大鼠EPHX2基因过表达重组质粒,观察其在人胚肾细胞（human embryonic kidney 293T,HEK293T）中的表达,及对HEK293T细胞NF-κBp65 mRNA表达的影响.方法：提取LETO、OLETF大鼠肾脏组织总RNA,RT-PCR方法扩增编码EPHX2基因的cDNA,克隆至T-载体并测序,经亚克隆至真核表达载体pcDNA3.1/V5-His,构建两型大鼠EPHX2过表达重组质粒,酶切鉴定并测序,采用磷酸钙共沉淀法转染HEK293T细胞系.Western Blot方法检测EPHX2融合蛋白的表达,RT-PCR方法检测EPHX2基因过表达对HEK293T细胞NF-κBp65表达水平的影响.结果：（1）两个重组质粒均含有完整EPHX2 cDNA,测序证实OLETF型大鼠较LETO型大鼠EPHX2重组质粒有五个核苷酸位点的改变.（2）转染HEK293T细胞后,Western Blot证实融合蛋白成功表达;（3）TNF-α刺激增加HEK293T细胞中NF-κBp65 mRNA表达;（4）EPHX2基因过表达促进TNF-α刺激后的HEK293T细胞中NF-κBp65 mRNA表达升高（P〈0.05）.结论：成功构建LETO型及OLETF型大鼠EPHX2过表达重组质粒（L-EPHX2/V5、O-EPHX2/V5）,可在HEK293T细胞中过表达.为进一步探讨EPHX2基因在糖尿病肾病发生发展中的作用奠定了基础.     

靶向细胞外信号调节激酶2短发夹式RNA对人食管癌Eca109细胞增殖的影响

目的 观察靶向细胞外信号调节激酶2(ERK2)短发夹式RNA(shRNA-ERK2)对人食管癌细胞株Eca109细胞增殖的影响.方法 构建重组质粒pGeneClipTM-shRNA-ERK2脂质体介导重组质粒转染人食管癌Eca109细胞,荧光倒置显微镜观察转染效率;噻唑蓝(MTT)比色法检测转染食管癌Eca109细胞后细胞的增殖能力;Western blot检测转染后食管癌Eca109细胞ERK2基因的表达和凋亡抑制基因Survivin的表达.结果 测序证实载体构建成功,荧光倒置显微镜观察转染后72 h转染效率50%～70%;转染重组质粒96 h后食管癌Eca109细胞生长抑制率最高为10.45%,与阴性对照组(非特异性序列对照)和空白对照组比较抑制效果明显(P＜0.05);转染重组质粒72 h和96 h后食管癌Eca109细胞株中ERK2和Survivin的表达与U0126对照组和阴性对照组比较均下降(P＜0.05).结论 重组质粒pGeneClipTM-shRNA-ERK2在食管癌Eca109细胞株中能发挥靶基因沉默作用,影响Survivin基因的表达,抑制食管癌细胞增殖.     

RNAi沉默pyk2基因对鼠脑胶质瘤细胞增殖、侵袭能力的影响

目的 探讨pyk2小干扰RNA表达载体对小鼠脑胶质瘤G422细胞增殖、侵袭能力的影响.方法 用以pGenesil-1质粒为载体,以pyk2为靶基因,构建短发夹状小干扰RNA表达载体.用pyk2短发夹状小干扰RNA表达载体转染体外培养的人脑胶质瘤G422细胞,反转录聚合酶链反应和Western blot法检测pyk2基因和蛋白表达的改变,噻唑蓝(MTT)比色法检测转染后细胞的增殖情况,Transwell小室法测定转染细胞体外侵袭能力.结果 构建了pGenesil-1-pyk2重组质粒,并成功转染G422细胞.逆转录-聚合酶链反应(RT-PCR)显示pyk2 siRNA转染G422细胞后显著降低pyk2mRNA的表达,以48 h为著,下降近70%;Western blot证实转染后pyk2蛋白的表达下降近65%;G422细胞的活力降低为(67.1±5.2)%;Transwell小室测定转染细胞体外侵袭能力明显下降.结论 pGenesil-1-pyk2 siRNA重组质粒明显下调pyk2在胶质瘤细胞中的表达,并抑制肿瘤细胞增殖,抑制其侵袭能力.     

人角质形成细胞基因导入效率的影响因素研究

目的 了解不同大小质粒和不同基因转染法对人KC基因导入效率的影响.方法 采用脂质体转染法、阳离子多聚物转染法、电穿孔联合细胞核转染试剂转染法、慢病毒感染法,分别将不同大小的质粒[pSUPER-增强型绿色荧光蛋白(EGFP)、pEGFP-N2、pHSER-绿色荧光蛋白(GFP)、ploxP-EGFP]导入人永生化KC株HaCaT细胞和人胚肾细胞株293FT细胞(后者为对照).于倒置荧光显微镜下观察GFP的表达,计算转染率.结果 (1)采用脂质体转染法可将4种质粒导入HaCaT细胞(转染率1.0%～3.3%)及293FT细胞(转染率80.0%～84.7%).(2)阳离子多聚物转染法亦可将4种质粒导入HaCaT细胞(转染率为1.0%～3.7%)和293FT细胞(转染率81.3%～86.7%).(3)采用电穿孔联合细胞核转染试剂转染法,可以将2种较小片段质粒pSUPER-EGFP和pEGFP-N2导入HaCaT细胞,转染率分别为22.3%和19.0%;而2种较大片段质粒pHSER-GFP和ploxP-EGFP的转染率分别为4.0%和3.3%.(4)pHSER-GFP经慢病毒包装后,导入HaCaT细胞的转染率高达97.0%,明显优于前3种转染法.结论 脂质体转染法、阳离子多聚物转染法较难将外源性基因导入人KC,慢病毒感染法的转染率明显优于电穿孔联合细胞核转染试剂转染法;不同大小质粒对转染率有明显影响.     

S期激酶相关蛋白2调控大鼠系膜细胞增殖

目的 探讨S期激酶相关蛋白2（Skp2）表达变化对系膜细胞增殖的影响。 方法 设计合成大鼠Skp2 siRNA和对照siRNA、pIRES-GFP-Skp2质粒和pIRES-GFP质粒。采用脂质体转染法进行细胞转染。半定量PCR和Western印迹法检测Skp2的mRNA、蛋白表达。原代培养的大鼠系膜细胞以每孔3000个接种于96孔板,分为以下6组：（1）无血清组;（2）20％胎牛血清（FCS）组;（3）10％FCS+pIRES-GFP质粒转染组;（4）10％FCS+pIRES-GFP-Skp2质粒转染组;（5）20％FCS+对照siRNA组;（6）20％FCS+Skp2 siRNA组。四甲基偶氮唑盐（MTT）法检测细胞相对活力和相对细胞数;BrdU标记法检测S期细胞;流式细胞仪检测细胞周期。 结果 半定量PCR法结果显示,与阴性对照siRNA组相比,Skp2 siRNA转染后Skp2 mRNA表达显著下调。Western印迹结果显示,与pIRES-GFP质粒转染组相比,pIRES-GFP-Skp2质粒转染后Skp2蛋白表达显著上调。MTT、BrdU和细胞周期分析显示,与相应对照组相比,Skp2质粒转染后相对细胞数增加（A值：0.419±0.088 比 0.305±0.036,P ＜ 0.01）、S期细胞数增多（BrdU 阳性细胞：0.21±0.04比0.15±0.03,P ＜ 0.01;S期细胞数：20.18±0.64比14.33±0.37,P ＜ 0.01）;Skp2 siRNA转染后相对细胞数减少（A值：0.328±0.069比0.482±0.133,P ＜ 0.01）;S期细胞数减少（BrdU 阳性细胞：0.17±0.01比0.24±0.00,P ＜ 0.01;S期细胞数：16.52±0.75比23.81±1.25,P ＜ 0.01）。 结论 Skp2过表达促进系膜细胞增殖,下调Skp2表达可抑制系膜细胞增殖。     

人胚肾细胞SGLT2基因异源表达体系的构建

目的 构建钠依赖的葡萄糖转运蛋白2（SGLT2）基因异源表达体系,为探讨突变引起SGLT2蛋白功能及表达异常的分子机制提供实验依据。 方法 利用RT-PCR法从人肾组织中获得SGLT2基因,将该基因克隆到真核表达载体PEXL-GFP（绿色荧光蛋白）中,将携带有SGLT2基因的PEXL载体转染人胚肾细胞系（HEK293细胞）,获得目的蛋白的瞬时表达。应用Western印迹及激光共聚焦显微镜检测融合蛋白在HEK293细胞的表达和分布,并通过摄取实验进一步验证SGLT2蛋白的转运功能。 结果 SGLT2-GFP蛋白可在HEK293细胞表达,激光共聚焦显微镜观察发现,SGLT2-GFP蛋白在细胞膜上呈点状分布,并且与细胞膜标记物（DiI）有良好的共定位,转染SGLT2-GFP质粒的HEK293细胞的转运活性较对照组（未转染及转染空质粒细胞组）强约3.5倍（P < 0.01）。 结论 成功构建了SGLT2真核表达载体,为探讨SGLT2基因表达、功能及SGLT2突变在家族性肾性糖尿发病的遗传机制提供了重要的依据。     

干扰X连锁凋亡抑制蛋白基因对人胆管癌QBC939细胞增殖及凋亡的作用

目的 观察反义寡核苷酸(ASODN)对人胆管癌QBC939细胞株X连锁凋亡抑制蛋白(XIAP)基因的抑制作用及对癌细胞增殖及凋亡的影响.方法 脂质体法将ASODN转染入QBC939细胞中,转染12、24、48 h后荧光显微镜观察转染后细胞状态及转染率,应用噻唑蓝(MTT)比色法、逆转录-聚合酶链反应(RT-PCR)法和流式细胞仪法测定1.11μmol/L时细胞生长抑制率、XIAP mRNA表达和细胞周期及凋亡率.结果 转染效率可达95%;与对照组比较,1.11μumol/L细胞抑制率为(27.63±1.15)%(24 h),(42.95±1.07)%(48 h);mRNA下调23%(P<0.05);G_0/G_1期细胞、凋亡率高于对照组约27.34%、9.94%(P<0.05).结论 ASODN能有效下调QBC939细胞XIAP基因表达,抑制细胞增殖并诱导凋亡.     

人皮肤成纤维细胞体外转染Brgl基因的实验研究

目的探讨重组Brgl基因转染人皮肤成纤维细胞的可行性,以及转染对细胞增殖和活性的影响。方法体外重组Brgl基因,借助真核表达载体系统,转入体外培养的人皮肤成纤维细胞;通过流式细胞仪检测报告基因表达,并确定细胞转染效率：应用ReahimePCR比较转染前后BrglmRNA的表达;MTT法检测Brgl基因对细胞增殖能力的影响。结果Brgl基因转染后,（73．0±6．7）％的被转染细胞表达报告基因;BrglmRNA在转染组、转染空载体组、未转染组细胞中的表达分别为（6．23±1．18）、（1．11±0．22）和（1．52±0．12）,转染组BrglmRNA相对表达量较未转染组及转染空载体组明显增高（P〈0．01）;细胞的增殖能力在Brgl基因转染前后无显著差异。结论人皮肤成纤维细胞可作为Brgl转染的靶细胞．转染Brgl基因对人成纤维细胞的增殖能力无显著影响。     

YAP 基因干扰对乳腺癌细胞增殖和凋亡的影响

目的：探讨干扰YAP基因的表达对乳腺癌细胞增殖和凋亡的影响。 方法：通过逆转录病毒介导的方法,分别用YAP shRNA（实验组）或阴性对照shRNA（对照组）转染MCF-7乳腺癌细胞,用qRT-PCR和Western blot方法检测干扰效率;溴脱氧核苷尿嘧啶（BrdU）结合实验和MTT法检测细胞增殖活性;流式细胞术和DAPI染色检测细胞凋亡情况。 结果：干扰效率检测显示,转染72 h后,实验组MCF-7细胞YAP mRNA表达量明显降低（P<0.05）,同时YAP蛋白表达也明显下调;细胞增殖检测显示,与对照组比较,实验组MCF-7细胞BrdU结合与OD值明显降低（P<0.05）,转染后24、48、72 h增殖抑制率分别为19.1%、38.5%、53.5%;凋亡检测显示,实验组细胞凋亡率与凋亡细胞数较对照组明显增加（均P<0.05）。 结论：干扰YAP基因的表达能有效抑制乳腺癌细胞的增殖并促进凋亡,YAP可能是乳腺癌潜在治疗靶点。     

La核糖核蛋白6对人血管内皮细胞增殖与凋亡的作用

目的 研究La核糖核蛋白6(Achn)在人血管内皮细胞增殖和凋亡中的调节作用.方法 (1)DMEM无血清培养基培养人血管内皮细胞株Eahy926细胞,按随机数字表法(下同)分为Achn抑制组(转染Achn抑制表达载体psi-Achn)、psi4.1空载体组(转染psi4.1)、Achn诱导组(转染Achn诱导表达载体pcDNA-Achn)、pcDNA3.1空载体组(转染pcDNA3.1)、Achn与钙/钙调蛋白依赖性丝氨酸蛋白激酶(CASK)共转染组(转染pcDNA-Achn与CASK抑制表达载体psi-CASK)、空白对照组(PBS处理),分别于转染后1、24、48、72 h用噻唑蓝法测定各组细胞570 nm波长下的吸光度值.(2)取Eahy926细胞,裂解细胞总蛋白,二辛丁酸法定量后分为蛋白质印迹组(总蛋白量为20μg)、Achn蛋白沉淀组、CASK蛋白沉淀组、IgG对照组,后3组细胞蛋白总量各为100μg,免疫共沉淀法检测各组Achn、CASK蛋白水平.(3)取Eahy926细胞分为LPS组(5 mol/L LPS处理)、氯化钾组(5 mol/L氯化钾处理)、空白对照组(5 mol/L PBS处理)、Achn诱导转染组(转染pcDNA-Achn)、Achn与CASK共转染组(转染pcDNA-Achn与psi-CASK),转染组转染24 h后加入LPS刺激12 h,免疫组织化学法检测各组半胱氨酸天冬氨酸蛋白酶3(caspase-3)蛋白表达.(4)取Eahy926细胞分为Achn诱导组(转染pcDNA-Achn)、Achn抑制组(转染psi-Achn)、对照组(PBS处理),24 h后加入烧伤患者血清处理12 h,流式细胞仪检测各组细胞凋亡率.对实验数据行t检验和单因素方差分析.结果 (1)Achn抑制组细胞增殖水平从24 h开始低于psi4.1空载体组,48、72 h时差异均有统计学意义(t值分别为10.777、6.112,P值均小于0.05);转染后24、48、72 h Achn诱导组细胞增殖水平均显著高于pcDNA3.1空载体组(t值分别为5.367、6.053、9.831,P值均小于0.05);Achn与CASK共转染组细胞增殖水平48、72 h均显著低于Achn诱导组(t值分别为5.481、9.517,P值均小于0.05).(2)CASK蛋白沉淀组CASK抗体沉淀物中可同时检测到CASK蛋白和Achn蛋白,而Achn蛋白沉淀组Achn抗体沉淀物中可同时检测到Achn蛋白和CASK蛋白.(3)Achn诱导转染组血管内皮细胞caspase-3阳性表达率为(15.6±0.5)%,低于LPS组[(32.8±2.6)%,t=10.083,P＜0.05];Achn与CASK共转染组caspase-3阳性细胞表达率[(7.0±2.0)%]进一步降低,显著低于LPS组(t=9.827,P＜0.01).(4)Achn抑制组细胞凋亡率为(45.6±10.9)%,显著高于对照组的(13.2±4.3)%,t=7.043,P＜0.05;Achn诱导组的细胞凋亡率为(5.3±2.9)%,显著低于对照组(t=6.499,P＜0.05).结论Achn能促进入血管内皮细胞增殖,抑制LPS或烧伤血清诱导细胞凋亡并与CASK的作用相关联.

Abstract：

Objective To investigate regulatory effect of Acheron (Achn) on proliferation and apoptosis of human vascular endothelial cell. Methods ( 1 ) Eahy926 cells were cultured in serum-free DMEM medium (96-well plates) and were divided into Achn inhibition group (transfected with plasmid psi-Achn), psi4.1 group (transfected with psi4. 1 empty vector), Achn induction group (transfected with pcDNA-Achn), pcDNA3.1 group (transfected with pcDNA3.1 empty vector), cotransfection group [cotransfected with pcDNA-Achn + psi-calcium/calmodulin-dependent serine protein kinase (CASK)] , blank control group (treated with PBS) according to the random number table (the same method below). The cell proliferation was determined by MTT assay at post transfection hour (PTH) 1, 24, 48, 72, with expression of absorbance value. (2) Total protein of Eahy926 cells were extracted and quantitated by BCA assay, and then they were divided into Achn antibody precipitation group (100 μg protein) , CASK antibody precipitation group ( 100 μg protein), IgG antibody group ( 100 μg protein), Western blot group (20 μg protein).Achn and CASK protein levels were determined by immunoprecipitation and Western blot. (3) Synchronously cultured Eahy926 cells were divided into LPS induction group (treated with 5 mol/L LPS), Achn transfection group (transfected with pcDNA-Achn), cotransfection group (cotransfected with psi-CASK and pcDNA-Achn) , KCl group (treated with 5 mol/L KCl), and blank control group (treated with 5 mol/LPBS). Cells in transfection groups were stimulated by LPS for 12 hours after PTH 24. Caspase-3 protein level was detected by immunohistochemistry. (4) Synchronously cultured Eahy926 cells were divided into Achn inhibition group (transfected with psi-Achn vector), Achn induction group ( transfected with pcDNA-Achn vector), and blank control group ( treated with PBS). Apoptosis rate was determined by FITC/PI with flow cytometry. Data were processed with one-way analysis of variance and t test. Results ( 1 ) The cell proliferation in Achn inhibition group was lower than that in psi4.1 group from PTH 24, and the differences were statistically significant at PTH 48, 72 (with t value respectively 10. 777, 6.112, P values all below 0. 05 ).The cell proliferation in Achn induction group during PTH 24-72 were higher that in pcDNA3. 1 group (with t value respectively 5. 367, 6. 053, 9. 831, P values all below 0.05 ). The cell proliferation in cotransfection group at PTH 48, 72 were significantly lower than that in Achn induction group ( with t value respectively 5.481, 9. 517, P values all below 0. 05). (2) Achn protein was detected in CASK antibody precipitation group while CASK protein was also detected in Achn antibody precipitation group. (3) Caspase-3 level in Achn transfection group was lower [( 15.6 ± 0. 5 ) %] as compared with that in LPS induction group [(32. 8 ±2.6)%, t = 10. 083, P ＜ 0. 05], and that in cotransfection group showed further inhibition [(7.0 ±2.0)%,t =9.827, P ＜0.01]. (4) Apoptosis rate in Achn inhibition group[(45.6 ± 10.9)%] was higher than that in blank control group [(13.2±4.3) %, t =7.043, P ＜0.05]; while that in Achn inductiongroup [(5.3 ±2.9)%] was lower than that in blank control group ( t =6.499, P ＜0.05).Conclusions Achn can promote human vascular endothelial cell proliferation, and inhibit its apoptosis induced by LPS or burn serum, and the effect is related to CASK.     

干扰Livin基因对人胆管癌QBC939细胞增殖影响的研究

目的 研究转染Livin反义寡核苷酸(antisense oligodeoxynucleotide,ASODN)对人胆管癌细胞株QBC939细胞Livin mRNA及Livin蛋白表达以及细胞增殖的影响.方法 设计合成全硫代磷酸化修饰并5'端FITC荧光标记的Livin ASODN.用脂质体介导Livin ASODN转染QBC939细胞,荧光显微镜观察24 h Livin ASODN转染人细胞的情况,并计算转染率.MTT法检测Livin反义寡核苷酸对QBC939细胞增殖的抑制作用.RT-PCR和细胞免疫荧光化学分别检测转染后48 h Livin mRNA表达及Livin蛋白的变化.结果 500 mol/L ASODN转染后24 h可达到最佳的转染效果;转染后60 h,能明显抑制胆管癌细胞的增殖.转染60 h后,RT-PCR及细胞免疫荧光化学检测分别显示Livin mRNA及Livin蛋白表达水平明显低于对照组(P<0.05).结论 脂质体介导转染Livin ASODN能特异性地抑制QBC939细胞中的Livin基因及Livin蛋白表达,抑制胆管癌QBC939细胞的增殖,降低癌细胞活力.

Abstract：

Objective To study the effect of transfection of livin antisense oligodeoxynucleotide (Livin ASODN) on Livin mRNA and Livin protein expression and proliferation of QBC939 cells.Methods Livin ASODN was transfected into cell line QBC939 by LipofectamineTM 2000. Fluorescence microscopy was used to observe the ASODN transfected cells and to calculate the rate of transfection.to measure Livin mRNA and Livin protein expression by RT-PCR and immunohistochemistry and con-focal laser scanning microscopy after the transfection. Changes in cell proliferation were detected by MTT. Results The highest efficiency was at 24 hours after 500 nmol/L Livin ASODN transfection.The results of MTT showed that the inhibition of cell proliferation of QBC939 cells was most obvious at 60 hours after Livin ASODN transfection (P<0. 05). The level of Livin mRNA and Livin protein expression in the ASODN group was obviously lower than that in the control group (P<0. 05).Conclusion The transfection of Livin ASODN inhibited Livin gene and Livin protein expression, and obviously inhibited the proliferation and depressed the vitality of QBC939 cells.     

microRNA-451对人脑胶质瘤细胞株A172增殖和凋亡的影响

目的 观察microRNA-451(miR-451)对胶质瘤细胞株A172增殖和凋亡的影响.方法 合成寡核苷酸miR-451拟似物(miR-451 mimics)转染A172细胞,实时聚合酶链反应(Real-time PCR)检测转染后miR-451的表达,Western blot法检测蛋白表达,应用流式细胞术、噻唑蓝(MTT)比色法和Annexin Ⅴ法评价miR-451对A172细胞生长、增殖和凋亡的影响.结果 与对照组比较,miR-451 mimics转染组细胞miR-451表达升高＞6倍;Western blot法显示癌基因AKT1表达下降到(43.81±5.20)%、Cyclin D1(56.09±3.40)%和bcl-2(63.49±3.70)%,抑癌基因p27表达升高到(145.51±6.70)%;细胞周期G0/G1期细胞增多达17.4%,出现G0/G1期阻滞;MTT法分析显示细胞生长受抑＞35%;Annexin Ⅴ法检测显示细胞凋亡明显升高＞15%.结论 miR-451可抑制人脑胶质瘤细胞生长和增殖,诱导细胞凋亡,具有抑瘤作用.     

反义RNA抑制Ezrin表达对乳腺癌细胞侵袭能力的影响

目的 观察特异性阻断Ezrin的表达对人乳腺癌细胞MDA-MB-231和MCF-7的增殖和侵袭能力的影响.方法 将anti-pCR3.1-Ezrin质粒经脂质体介导,转染人人乳腺癌细胞MDA-MB-231 6、12和24 h,应用Western blot和逆转录-聚合酶链反应(RT-PCR)方法检测Ezrin的表达变化情况;转染质粒24h后,噻唑蓝(MTT)比色法检测抑制Ezrin对MDA-MB-231和MCF-7细胞体外增殖能力的影响,Boyden小室法检测抑制Ezrin对MDA-MB-231和MCF-7细胞体外侵袭能力的影响.结果 转染anti-pCR3.1-Ezrin后,对MDA-MB-231细胞中的Ezrin表达抑制在24 h时达高峰.MTT法比色实验结果显示,MDA-MB-231和MCF-7细胞中转染anti-pCR3.1-Ezrin组、转染空质粒组和对照组的A值分别为0.410±0.018、0.765±0.058、0.795±0.061和0.480±0.021、0.632±0.052、0.648±0.059.转染anti-pCR3.1-Ezrin组细胞的增殖受到明显抑制,抑制率分别为(47.9±3.1)%和(32.0±2.8)%(P<0.05).Boyden小室法检测结果显示,MDA-MB-231和MCF-7细胞中转染anti-pCR3.1-Ezrin组细胞的侵袭能力分别为对照组的(50.5±3.2)%和(74.8±4.6)%(P<0.05).结论 Ezrin在乳腺癌的生长和侵袭过程中发挥重要作用.     

靶向STAT3的慢病毒表达载体的构建及其对血管平滑肌细胞增殖凋亡的影响

目的 构建大鼠STAT3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增殖和凋亡的影响.方法 针对STAT3基因的不同部位设计4对shRNA的寡核苷酸片段,克隆到慢病毒载体PLKO.1中,构建靶向STAT3基因的慢病毒载体PLK0.1-STAT3-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,用噻唑蓝法和流式细胞仪检测沉默STAT3基因后对血管平滑肌细胞增殖和凋亡能力的影响.结果　靶向STAT3慢病毒表达载体构建成功.转染PLKO.1-STAT3-shRNA后,STAT3蛋白表达明显下降,其中以PLKO.1-STAT3-S1最为明显,达到90%以上;转染PLKO.1-STAT3-S1的细胞增殖能力(A值=0.25±0.05)明显低于未转染组(A值=0.62±0.12)和阴性对照组细胞(A值=0.59±0.11)(P＜0.05);而早期细胞凋亡率(26.9±2.8)%和晚期细胞凋亡率(9.5±1.6)%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STAT3慢病毒表达载体PLKO.1-STAT3-S1,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.

Abstract：

Objective To construct a recombinant short hairpin RNA (shRNA) lentiviral vector carrying STAT3 gene in rats, and to investigate its effects on proliferation and apoptosis of vascular smooth muscle cells by silencing STAT3. Methods Four oligonucleotides targeting STAT3 gene were synthesized and cloned into lentivirus vector PLKO. 1. The shRNA lentiviral vector with best transfection efficiency was detected and identified, which was transfected into vascular smooth muscle cells in rats, and its effects on proliferation and apoptosis of vascular smooth muscle cells were measured by MTT and flow cytometry after silencing STAT3. Results The recombinant lentivirus vector PLKO. 1-STAT3-shRNA was constructed successfully. PLKO. 1-STAT3-shRNA knocked down the expression of STAT3 protein dramatically, especially PLKO. 1-STAT3-S1, whose transfection efficiency was more than 90%. The proliferation capacity of vascular smooth muscle cells transfected with PLKO. 1-STAT3-S1 (A value =0. 25 ±0. 05 ) was significantly lower than no-transfected group (A value =0. 62 ±0. 12) and negative control group (A value =0. 59 ±0. 11 )(P ＜ 0. 05). Meantime the early apoptosis rate (26. 9 ± 2. 8 ) % and late apoptosis rate (9. 5 ± 1.6 ) % in PLKO. 1-STAT3-shRNA-transfected group were significantly higher than in no-transfected group and negative control group (P ＜ 0. 01 ). Conclusion The recombinant lentivirus shRNA vector targeting STAT3,PLKO. 1-STAT3-S1, with best transfection efficiency, is constructed successfully. PLKO. 1-STAT3-S1 can inhibit the proliferation of vascular smooth muscle cells, and promote the cell apoptosis. This study lays the foundation for further studying on targeting treatment of vascular restenosis.     

存活素反义寡脱氧核苷酸对人恶性黑色素瘤细胞增殖和凋亡的影响

目的 了解存活素反义寡脱氧核苷酸(ASODN)对人恶性黑色素瘤细胞(hMMC)增殖和凋亡的影响.方法 取对数生长期hMMC株A375,按随机数字表法分为对照组(不转染)、正义链组(转染600 nmol/L存活素正义寡脱氧核苷酸)、错义链组(转染600 nmol/L存活素错义寡脱氧核苷酸)、脂质体组(仅用脂质体处理)、反义链组(转染存活素ASODN,根据转染物浓度再分为200、400、600 nmol/L 3个亚组),倒置荧光显微镜下观察转染效果.采用噻唑蓝法测定细胞存活情况并计算细胞增殖抑制率,双变量流式细胞仪检测细胞凋亡率及细胞周期,蛋白质印迹法检测存活素蛋白的表达,激酶法检测半胱氨酸天冬氨酸蛋白酶3(caspase-3)的活性.对数据进行方差分析.结果 (1)正义链组、错义链组、反义链600 nmol/L组细胞转染率均大于80%.(2)反义链200、400、600nmol/L组转染后24 h细胞增殖抑制率[(10.30±0.56)%、(16.69±0.58)%、(24.67±0.67)%]较正义链组[(5.23±0.25)%]、错义链组[(5.09±0.13)%]、脂质体组[(4.70±0.45)%]显著增加(F=746.91,P值均小于0.05),且随转染时间延长,增殖抑制率增加明显.(3)反义链200、400、600nmol/L组转染后24 h细胞凋亡率分别为(13.5±1.9)%、(20.1±1.5)%、(32.1±2.9)%,显著高于对照组、正义链组、错义链组、脂质体组的(6.5±0.6)%、(5.6±0.7)%、(6.4±1.0)%、(6.5±1.3)%(F=139.9,P值均小于0.05),细胞被阻滞在G2/M期.(4)与对照组比较,反义链各浓度组存活素蛋白表达量减少,caspase-3活性明显增高(F=63.1,P值均小于0.05);正义链组、错义链组、脂质体组caspase-3活性与对照组比较,差异无统计学意义(F=0.512,P值均大于0.05).结论 存活素ASODN能够呈浓度-时间依赖性抑制hMMC株A375增殖,诱导G2/M期阻滞,促进其凋亡.