五味子乙素促进多柔比星诱导肝癌细胞SMMC7721凋亡的研究

目的 验证五味子乙素对多柔比星（阿霉素）诱导肝癌细胞SMMC7721凋亡的促进作用.方法 MTT法测定药物对细胞存活的影响;流式细胞仪PI染色测定药物引起的细胞凋亡率,R-藻红蛋白标记测定P糖蛋白表达,Rhodanmin 123（Rh123）标记检测线粒体膜电位变化;流式细胞仪测定五味子乙素对阿霉素积聚外排的影响;Western blot检测药物作用后相关蛋白（caspase-3和PARP）表达.结果 五味子乙素能显著促进阿霉素诱导人肝癌细胞系SMMC7721凋亡（P＜0.01）,但不增强阿霉素对正常细胞（大鼠心肌细胞和人纤维原细胞）的毒性作用.这种增敏作用与五味子乙素对P糖蛋白及其它药泵的抑制作用无关,但与caspase的激活相关.结论 五味子乙素能促进阿霉素诱导的肝癌细胞凋亡,但不增加阿霉素对正常细胞的毒性作用.     

丹参多酚酸盐通过线粒体途径诱导人肝癌SMMC-7721细胞的凋亡

目的：研究丹参多酚酸盐(salvianolate)体外诱导人肝癌细胞SMMC-7721凋亡作用及其可能机制。方法：不同质量浓度丹参多酚酸盐(0.5、1、2 mg/ml)与肝癌细胞共培养24 h后,流式细胞仪检测肝癌细胞凋亡,线粒体膜电位试剂盒(JC-1)检测线粒体膜电位变化;比色法测定1.0 mg/ml丹参多酚酸盐作用后肝癌细胞内caspase8、caspase9 及caspase3的活性,流式细胞仪检测培养体系内加入caspase9抑制剂(zLEHDfmk)或caspase3抑制剂(zDEVDfmk)后细胞凋亡率的变化,Western blotting检测肝癌细胞内线粒体凋亡途径相关蛋白Bax、Bcl2表达水平。结果：丹参多酚酸盐显著诱导肝癌细胞SMMC7721凋亡(P<0.05),同时线粒体膜电位随着药物浓度的升高而加剧下降(P<0.05)。1.0 mg/ml 丹参多酚酸盐处理肝癌细胞24 h后caspase-9与caspase-3的活性明显升高(P<0.05),而caspase-8的活性无明显变化(P>0.05);当培养体系内加入caspase-9或caspase3活性抑制剂后,丹参多酚酸盐诱导肿瘤细胞凋亡的作用明显降低(P<0.05)。Western blotting检测显示,丹参多酚酸盐处理组前凋亡蛋白Bax表达明显升高,抗凋亡蛋白Bcl2表达降低。结论：丹参多酚酸盐(0.5~2.0 mg/ml)剂量具有促进肝癌细胞凋亡的作用,且有剂量依赖的趋势,其机制与线粒体凋亡途径有关。     

低氧条件下食管癌细胞中PRRX1通过p53介导线粒体通路诱导细胞凋亡的研究

目的:探究低氧条件下配对相关同源框1（PRRX1）通过p53介导的线粒体通路诱导食管癌细胞凋亡。方法:GEPIA2数据库分析PRRX1基因在食管癌组织和正常食管组织中的表达变化。RT-qPCR和Western blotting分别检测HEEC、Eca-109、TE-1细胞中PRRX1的mRNA和蛋白表达。二氧化钴处理模拟低氧微环境,在常氧和低氧条件下检测Eca-109、TE-1细胞中PRRX1的mRNA和蛋白表达情况。采用小干扰RNA（Si-PRRX1）转染TE-1细胞,设置分组为Hypoxia-Si-NC、Hypoxia-Si-PRRX1。流式细胞术检测TE-1细胞凋亡,RT-qPCR检测p53 mRNA表达,Western blotting检测p53、BCL-2、BAX、Cleaved-Caspase3等蛋白表达,在TE-1-PRRX1 KO细胞系中过表达p53,检测 BCL-2、BAX、Cleaved-Caspase3等蛋白表达。结果:PRRX1在食管癌组织及细胞系中均高表达。在TE-1细胞中敲低PRRX1,抑制细胞凋亡,下调p53的mRNA及蛋白表达,抑制BAX、Cleaved-Caspase3蛋白表达,促进BCL-2蛋白表达;过表达PRRX1则上调p53蛋白表达。在TE-1-PRRX1 KO细胞系中过表达p53显著抑制BCL-2蛋白表达,促进BAX、Cleaved-Caspase3蛋白表达。结论:低氧条件下,PRRX1通过p53介导的线粒体通路诱导食管癌细胞凋亡。     

δ-生育三烯酚诱导人肝癌HepG2细胞凋亡的机制研究

目的:探讨δ-生育三烯酚诱导人肝癌HepG2细胞凋亡的作用机制.方法:应用MTT法检测δ-生育三烯酚对人肝癌HepG2细胞增殖的影响,应用高内涵活细胞成像系统检测δ-生育三烯酚对人肝癌HepG2细胞凋亡率、细胞周期以及线粒体膜电位的影响,Western印迹法检测δ-生育三烯酚对人肝癌HepG2细胞凋亡相关蛋白(如caspase-3、caspase-8、caspase-9、Bcl-2、Bax、tBid和cytochrome C)表达的影响.结果:δ-生育三烯酚呈浓度依赖性地抑制肝癌HepG2细胞生长并诱导其凋亡,其机制为δ-生育三烯酚降低线粒体膜电位,并诱导cytochrome C从线粒体释放到细胞质中,调控Bcl-2家族蛋白表达(如上调Bax及tBid蛋白的表达,下调Bcl-2蛋白的表达),继而引起caspase-3、caspase-8和caspase-9的活化,最终导致肝癌 HepG2细胞凋亡.结论:δ-生育三烯酚可能通过线粒体途径及膜死亡受体途径共同诱导人肝癌细胞 HepG2凋亡.     

PUMA通过线粒体途径诱导骨肉瘤细胞凋亡的研究

目的:研究p53上调凋亡调控因子(PUMA)对骨肉瘤细胞凋亡的影响及机制。方法:在骨肉瘤细胞F5M2中转染PUMA过表达载体,同时转染对照阴性载体,以qRT-PCR和Western blot法测定转染后细胞中PUMA表达情况,以流式细胞术检测细胞凋亡情况,用JC-1法检测细胞线粒体膜电位,以Western blot法测定线粒体和胞浆中细胞色素C（Cyt C）蛋白表达情况,同时检测细胞中剪切的含半胱氨酸的天冬氨酸蛋白水 解酶3（Cleaved Caspase-3）、剪切的含半胱氨酸的天冬氨酸蛋白水解酶9（Cleaved Caspase-9）蛋白水平。结果:转染PUMA过表达载体后的F5M2细胞中PUMA mRNA和蛋白水平升高,而转染对照阴性载体对F5M2细胞中PUMA mRNA和蛋白水平没有影响。过表达PUMA后的F5M2细胞凋亡率升高,细胞线粒体膜电位下降,线粒体中Cyt C蛋白水平降低,胞浆中Cyt C蛋白水平升高,同时细胞中Cleaved Caspase-3、Cleaved Caspase-9蛋白水平也升高,与未做转染的F5M2细胞比,差异有统计学意义（P<0.05）。转染对照阴性载体后的细胞凋亡率、线粒体膜电位、线粒体和胞浆中Cyt C蛋白水平、Cleaved Caspase-3蛋白水平、Cleaved Caspase-9蛋白水平与未做转染的F5M2细胞相比没有明显变化（P>0.05）。结论:PUMA通过促进线粒体中Cyt C释放,降低线粒体膜电位,激活Caspase-3诱导骨肉瘤细胞凋亡。     

含AFP基因调控序列的pAFP-P53-EGFP质粒诱导AFP阳性肝癌细胞凋亡

目的：观察含AFP基因调控序列的载体对AFP阳性肝癌细胞的靶向致凋亡作用。方法：将AFP启动子、沉默子和远端增强子Ⅲ组合为1.2 kb的AFP基因调控序列,构建pAFPEGFP载体,分别转染人肝癌HepG2（AFP阳性）、人肝癌SMMC7721（AFP阴性）和人宫颈癌HeLa（AFP阴性）细胞,荧光显微镜下观察EGFP荧光蛋白表达强度。引入P〖STBX〗53〖STBZ〗基因片段,构建pAFPP53EGFP重组质粒,转染HepG2、SMMC7721和HeLa细胞,Western blotting检测各组细胞P53蛋白的表达,流式细胞术分析各组细胞凋亡率及细胞周期。结果：成功构建了pAFPEGFP和pAFPP53EGFP重组质粒。pAFPEGFP转染后,AFP阳性的HepG2细胞中EGFP荧光蛋白表达显著高于AFP阴性的SMMC7721和HeLa细胞。pAFPP53EGFP转染后,HepG2细胞中P53蛋白的表达量明显高于SMMC7721和HeLa细胞;HepG2细胞的G1期细胞及细胞凋亡率明显高于SMMC7721和HeLa细胞\[(66.7±0.25)% vs（50.5±0.18）%,（51.0±0.20）%,P<0.05;（2.65±008）% vs（0.42±003）%,（0.39±0.02）%,P<0.05\], 但S期细胞明显低于转染后SMMC7721和HeLa细胞\[(20.1±022)% vs（29.8±018）%,（37.8±0.21）%,P<0.05\]。结论：含AFP基因调控序列的pAFPP53EGFP载体可专一性地作用于AFP阳性肝癌细胞,引起肝癌细胞周期阻滞和凋亡。     

Survivin与Caspase-3在光动力诱导肝癌细胞SMMC-7721凋亡中的作用

目的：探讨Survivin与Caspase-3在血卟啉化衍生物（hematoporphyrin derivative,HPD）光动力作用（photodynamic therapy,PDT）诱导人肝癌细胞SMMC-7721凋亡中作用。方法：应用流式细胞术检测光动力作用后细胞凋亡率。用免疫组化法检测细胞内Survivin及Caspase-3蛋白表达情况,并用RT—PCR检测其基因水平。结果：血卟啉衍生物光动力组人肝癌细胞SMMC-7721凋亡率达（33．42±5．52）％,与对照组相比,差异有显著意义（P〈0．05）;光动力作用后Survivin的蛋白表达及基因水平显著低于对照组（P〈0．05）,而Caspase-3却显著高于对照组（P〈0．05）。结论：血卟啉衍生物光动力作用具有诱导人肝癌细胞SMMC7721凋亡的生物学效应,其作用机制可能与光动力作用抑制凋亡调控蛋白Survivin表达,并且直接或间接促进Caspase-3的表达,从而促进细胞凋亡。     

敲低EN2诱导肝癌细胞凋亡并提高PTEN蛋白的表达

 目的 探讨EN2对肝癌细胞凋亡及细胞中PTEN蛋白表达的影响。方法 用EN2 siRNA慢病毒感染肝癌细胞HuH-7，qRT-PCR和Western blot方法检测干扰效果。MTT方法测定细胞活力变化，PI单染法测定细胞周期分布，Annexin V-FITC/PI双染法测定细胞凋亡变化，Western blot测定细胞中激活型Caspase-3（Cleaved Caspase-3）、激活型Caspase-9（Cleaved Caspase-9）、第10号染色体同源缺失性磷酸酶-张力蛋白（PTEN）及细胞周期素B 1( Cyclin B l)蛋白水平，JC-1法测定线粒体膜电位变化，Western blot测定胞浆中细胞色素C（Cytochrome C）蛋白水平。结果 EN2 siRNA慢病毒感染可明显下调肝癌细胞中EN2的表达。沉默EN2表达后的肝癌细胞活力降低，细胞凋亡率升高，细胞G2/M期比例升高，细胞中Cleaved Caspase-3、Cleaved Caspase-9、PTEN蛋白水平明显升高，Cyclin B1蛋白水平明显降低，线粒体膜电位下降，胞质中Cytochrome C蛋白水平升高。结论 敲低EN2可以阻滞肝癌细胞周期，诱导肝癌细胞凋亡，其作用机制可能与PTEN、线粒体凋亡途径有关。     

RNA干扰抑制BMP-2基因表达对人肝癌SMMC7721细胞增殖和凋亡的影响

目的：设计并化学合成针对骨形态发生蛋白2（BMP-2）的siRNA分子片段,转染人肝癌SMMC7721细胞,观察其对SMMC7721细胞增殖和凋亡的影响。方法：阳离子脂质体法瞬间转染SMMC7721细胞,半定量逆转录聚合酶链反应(RT-PCR)法和Western印迹法检测转染BMP-2-siRNA后细胞BMP-2 mRNA水平和蛋白水平的变化,MTT法和流式细胞术检测转染BMP-2-siRNA后SMMC7721细胞增殖、细胞周期和凋亡的变化。结果：3对特异性BMP-2-siRNA均有效地抑制了BMP-2基因的表达,以siRNA-B抑制效果最好。转染BMP-2-siRNA后SMMC7721细胞的增殖能力明显受到抑制( P <0.05)且明显促进了SMMC7721细胞的凋亡。结论：靶向BMP-2基因的siRNA分子片段可以有效地抑制人肝癌SMMC7721细胞的增殖并促进其凋亡     

新城疫病毒HN基因诱导肝癌细胞SMMC7721凋亡的作用机制

目的 探索含新城疫病毒(NDV)HN基因的质粒pVHN诱导人肝癌细胞SMMC7721凋亡的作用及其机制。方法 以脂质体介导方法在体外转染pVHN于SMMC7721细胞24h后,通过MTT方法检测细胞活性状态;采用流式细胞仪(FCM)检测法,通过碘化丙啶(PI)染色测定细胞死亡率;以罗丹明123染色测定线粒体跨膜电位(△ψ)的改变;提取细胞基因组DNA进行电泳,检测DNA有无断裂;用底物颜色反应检测Caspase-3活性。结果 细胞SMMC7721在体外转染pVHN后,死亡率达50．0％(转染空载体质粒对照组为5．2％);细胞基因组DNA呈梯状谱带;线粒体△ψ下降,Caspase-3活性明显升高。结论 新城疫病毒HN基因在体外转染细胞SMMC7721,能明显诱导细胞SMMC7721凋亡,其发生机制可能是由于HN基因的导入引起线粒体△ψ下降,进而激活Caspase-3使细胞凋亡。     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

目的 观察hSav1蛋白高表达对Mst1介导的细胞凋亡的影响,探讨hSav1在Mst1介导的细胞凋亡中的作用.方法 构建蛋白hSav1的载体pCMV-HA-hSav1与蛋白Mst1的载体pcDNA/4TO-Flag-Mst1,共转染HeLa细胞.采用相应抗体做二者的免疫共沉淀,以证实蛋白hSav1和Mst1之间的相互作用;应用细胞免疫荧光共定位,进一步证实二者之间的相互作用.在HeLa细胞中,分别单独或同时转染质粒pcDNA/4TO-Flag-Mstl和pCMV-HA-hSav1,转染36 h后,加入凋亡诱导剂顺铂(50 μmol/L)作用14 h.应用磷脂结合蛋白碘化丙啶(Annexin V/PI)法检测细胞凋亡,观察蛋白hSav1高表达对Mst1介导的细胞凋亡的影响.结果 载体pCMV-HA-hSav1与pcDNA/4TO-Flag-Mst1构建成功,测序结果表明无突变或缺失.免疫共沉淀结果显示,蛋白hSav1可以在Mst1抗体的免疫沉淀物中检测出来,蛋白Mst1可以在hSav1抗体的免疫沉淀物中检测出来.细胞免疫荧光的结果显示,二者的荧光在细胞内存在共定位,并可充分融合.HeLa细胞中,单独Mst1蛋白高表达组的细胞凋亡率为24.5%±2.4%,单独hSav1蛋白高表达组与对照组比较,无明显细胞凋亡.蛋白Mst1和hSav1高表达组的细胞凋亡率为39.3%±4.0%,差异有统计学意义(P<0.05).结论 蛋白hSav1与Mst1在HeLa细胞内存在相互作用,蛋白hSav1高表达可明显促进由蛋白Mst1介导的细胞凋亡.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.     

hSav1蛋白高表达对Mst1介导的细胞凋亡的影响

Objective To elucidate the effect of hSavl expression on Mstl-mediated apoptosis in HeLa cells. Methods Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and cotransfected into HeLa cells. Triple immunofluorescent labeling of hSav1, Mst1 and nucleus was performed to determine their subcellular localization. Plasmids pCMV-HA-hSav1 and/or pcDNA/4TO-Flag-Mst1 were transfected into HeLa cells, and 36 hours later cisplatin (50 μmol/L) as a pro-apoptotic agent was added for 14 hours. Cell apoptosis was analyzed by annexin V/PI assay. Results Plasmids pCMV-HA-hSav1 and pcDNA/4TO-Flag-Mst1 were constructed and the authenticity of constructs was verified by sequencing. The binding in vitro showed that hSavl could be detect from the anti-Mstl immunoprecipitation complex. The immunofluorescent labeling showed that hSavl and Mstl had the same localization in cells. Overexpressed protein hSavl did not induce a significant cell apoptosis. However, co-expression of hSavl with Mstl resulted in a significant increase of apoptosis above the level seen with Mstl alone (24. 5% ± 2.4% vs. 39.3% ± 4.0%, P < 0. 05). Conclusion Our findings indicate that hSavl is a newly identified protein that interacts with Mst1 and a, augments Mst1-mediated apoptosis.