Survivin反义寡核苷酸增加A375细胞对顺铂的敏感性

目的研究Survivin反义寡核苷酸对人恶性黑色素瘤A375细胞顺铂治疗敏感性的影响。方法台盼蓝计数观察Survivin反义寡核苷酸和顺铂对A375细胞增殖的抑制作用。结果5μmol/L反义寡核苷酸与0.5 mg/L顺铂共同作用于A375细胞72 h,细胞生长抑制率为61.3%,高于单因素作用组,组间比较差异具有统计学意义(P<0.001)。用反义寡核苷酸预处理细胞24 h后加入顺铂对A375细胞的生长抑制率为68.0%,高于同时用药组,但组间差异无统计学意义。结论反义寡核苷酸和顺铂联合用药对A375细胞生存具有协同抑制效应,即Survivin反义寡核苷酸可增强A375细胞对顺铂治疗的敏感性。     

人宫颈癌细胞凋亡与Bcl-2表达的研究

目的　探明 Bcl- 2在宫颈癌细胞凋亡过程中的作用。方法　采用 60 Co和顺铂处理体外培养的 3株人宫颈癌细胞株 Hela、Si Ha、RJC,2 4 h后检测细胞凋亡和 Bcl- 2。结果　发现放射线 60Co和顺铂均可以诱发宫颈癌细胞凋亡 ;它们都表达 Bcl- 2 ,其表达率随着细胞凋亡的出现而下降 ;两种因素联合应用后诱导细胞凋亡和降低 Bcl- 2表达的作用增强。结论　 Bcl- 2的表达可能参与了宫颈癌细胞凋亡的调节过程     

小剂量顺铂增加人宫颈癌Hela和Siha细胞对光动力治疗敏感性的研究

目的 探讨小剂量顺铂增加入宫颈癌Hela和Siha细胞系对光动力治疗的敏感性及细胞凋亡的机理.方法 将Hela和Siha细胞分为空白对照组、单纯光动力治疗组、单纯顺铂治疗组和光动力加顺铂治疗组,MTT法检测各组入宫颈癌细胞株Hela和Siha的增殖情况.采用免疫细胞化学法检测各组Hela和Siha细胞受作用后P185c-erbB-2蛋白的表达情况.结果 顺铂和光动力治疗联合应用导致细胞凋亡的程度均明显强于单一顺铂作用或光动力作用,细胞中P185c-exbB-2蛋白的表达下降程度也与之相一致.但是先顺铂后光动力治疗和先光动力治疗后顺铂相比,作用效果差异不明显.结论 顺铂和光动力联合治疗在体外对人宫颈癌Hela和Siha细胞有明显增殖抑制作用,强于单独一种方法治疗,其机理可能与抑制P185c-erbB-2表达有关.     

粉防己碱诱导宫颈癌细胞凋亡的定性定量研究

目的 从定性定量角度探讨粉防己碱诱导宫颈癌HeLa细胞凋亡的作用.方法 采用MTT法检测不同浓度粉防己碱作用不同时间对人宫颈癌HeLa细胞株的增殖抑制作用.通过流式细胞仪和激光共聚焦显微镜检测细胞凋亡情况.结果 粉防己碱对宫颈癌HeLa细胞具有增殖抑制作用,且呈时间、浓度依赖性.应用流式细胞仪检测到15μmol/L粉防己碱诱导HeLa细胞产生的凋亡率为(51.8±0.97)%,显著高于对照组凋亡率(24.3±1.23)%(P<0.05).通过激光共聚焦显微镜观察,与对照组比较,粉防己碱作用后HeLa细胞具有明显的凋亡形态.结论 粉防己碱能够抑制HeLa细胞的增殖并诱导其凋亡.     

反义寡核苷酸抑制人恶性黑素瘤A375细胞survivin mRNA及其蛋白的表达

目的研究survivin反义寡核苷酸(ASODN)对人恶性黑素瘤A375细胞survivin mRNA及蛋白表达的影响。方法人工合成survivin ASODN,脂质体介导转染人恶性黑素瘤细胞株A375,采用原位杂交、免疫组化SP法检测survivin mRNA及其蛋白表达的变化。结果转染24 h后,ASODN组A375细胞survivin mRNA表达较对照组显著下调(P<0.01);转染48 h后,与对照组相比,ASODN组细胞的survivin蛋白水平显著下降(P<0.01)。结论Survivin ASODN可下调A375细胞survivin mRNA的表达和survivin蛋白水平。     

shRNA干扰LGR5对HeLa细胞增殖及耐药性的影响

目的探讨富含亮氨酸重复序列G-蛋白偶联受体5(LGR5)基因在HeLa细胞增殖及耐药性中的作用及可能机制。方法采用shRNA技术干扰LGR5表达,构建LGR5干扰(shLGR5)的HeLa细胞,并设对照组(shCon)。采用细胞计数、平板克隆以及MTT实验观察shLGR5对HeLa细胞增殖及耐药性的影响;采用Western blot检测LGR5、β-catenin在HeLa细胞中的表达。结果成功构建了LGR5干扰的HeLa细胞系;与shCon组相比,shLGR5组细胞生长速度及克隆形成率明显降低,差异具有统计学意义(P<0.01);shLGR5组与shCon组HeLa细胞对顺铂的耐药性差异亦具有统计学意义(P<0.01);且干扰LGR5抑制HeLa细胞中β-catenin蛋白的表达。结论 LGR5基因在HeLa细胞增殖及耐药性中有重要作用,且与Wnt/β-catenin通路有关。     

低氧诱导肾上腺髓质素对卵巢癌细胞及在体肿瘤的生长促进作用

目的观察低氧情况下肾上腺髓质素(ADM)对卵巢癌细胞及在体肿瘤的生长促进作用。方法三种卵巢癌细胞系A2780、SKOV3、HO-8910于低氧环境中培养6~24h,采用RT-PCR分析ADM、低氧诱导因子1α(HIF-1α)、血管内皮生长因子(VEGF)的mRNA表达改变。通过质粒转染获得稳定表达ADM-shRNA的HO-8910细胞,流式细胞术检测ADM表达沉默后卵巢癌细胞的细胞凋亡比例。建立卵巢癌细胞裸鼠荷瘤模型,各组裸鼠每天腹腔内注射5mg/kg的顺铂或皮下瘤内注射10μg/kg的ADM-shRNA,观察肿瘤体积变化并采用Western blot检测ADM蛋白表达。结果 HO-8910细胞24h低氧使ADM mRNA表达上升4.13倍(P<0.000 1),VEGF、HIF-1α的mRNA表达则比对照组升高3.46(P<0.01)和3.91倍(P<0.000 1)。转染72h后,shADM组细胞ADM蛋白表达量比对照组降低48.2%(P<0.05),mRNA比对照组降低26.9%(P<0.000 1)。shADM组凋亡细胞比例显著高于正常组(shADM组:42.65%;正常组:8.4%;二者相比P<0.01)。顺铂+shADM组的抑瘤率为71.39%,显著高于顺铂+PBS组的39.21%(P<0.001)或者盐水+shADM组的49.45%(P<0.05)。结论低氧环境可诱导卵巢癌细胞ADM表达增加,激活VEGF和HIF-1相关信号通路,继而促进卵巢癌细胞的生长存活。ADM基因沉默能显著促进卵巢癌细胞凋亡并加强顺铂对裸鼠在体瘤的抑瘤作用,因此可能成为卵巢癌基因治疗的潜在的靶点。     

K-ras基因点突变的反义寡脱氧核苷酸对人胰腺癌靶基因表达的抑制作用

目的　观察针对于胰腺癌K ras基因点突变的反义寡核苷酸对靶基因表达的抑制作用。方法　脂质体将人工合成的针对于K ras基因第 12位密码子点突变的反义寡核苷酸转染体外培养的人胰腺癌细胞株PC 2 ,用免疫组化和原位杂交技术检测靶基因的表达。结果　转染 4 8h后 ,反义寡核苷酸作用组胰腺癌细胞株PC 2的ras蛋白和K rasmRNA的表达程度较正义组和对照组均明显降低 (P <0 .0 5 )。结论　针对于K ras基因点突变的反义寡核苷酸作用于体外培养的胰腺癌细胞 ,对靶基因的表达有明显的抑制作用     

人宫颈癌细胞凋亡的研究

目的　观察顺铂、60 Co在宫颈癌细胞凋亡的作用及其引起的细胞形态学、DNA及细胞周期变化。方法　将人宫颈癌细胞株Hela,SiHa和RJC进行体外培养 ,用不同强度的放射线60 Co照射 ,观察照射后不同时间内肿瘤细胞形态变化 ,并采用末端脱氧核苷酰转移酶标记法 (TDT法 )检查细胞DNA有无断裂 ,用流式细胞仪记录细胞周期的改变和Bcl 2蛋白表达情况。同时将顺铂处理的宫颈癌细胞作为对照组 ,观察放射线和药物对宫颈癌细胞的联合作用。结果　经60 Co照射的三株细胞均出现凋亡的典型形态学改变 ,TDT法染色见受照细胞核内均有DNA断裂表现 ;细胞周期进展受到阻滞 ;Bcl 2蛋白表达在Hela细胞升高 ,而在SiHa和RJC细胞则降低 ,SiHa细胞对60 Co照射最为敏感 ,40 0CGy即可出现细胞凋亡的改变。顺铂单独处理可使宫颈癌细胞凋亡 ,与放射线联用有明显的增强细胞凋亡的效果。并在RJC细胞的G1 峰前出现凋亡峰。结论　宫颈癌细胞受到60 Co照射后 ,凋亡是其主要死亡形式 ,不同的宫颈癌细胞株对放射线的敏感性存在明显差异 ,与细胞凋亡有关的Bcl 2表达与宫颈癌细胞凋亡的发生呈负相关 ,放射线照射与化疗药物联合可以增加抑制宫颈癌生长的作用。     

nm23-H1对顺铂化疗效果影响的体外研究

目的nm23-H1对顺铂化疗效果的影响及其可能机制。方法通过脂质体转染法,将nm23-H1转染入舌癌细胞株Tca8113,经免疫组化和Western-bloting鉴定,建立稳定表达细胞株。检测转染组和未转染组顺铂杀伤率、细胞凋亡和线粒体膜电位的变化。结果nm23-H1过表达可以明显提高顺铂对舌癌细胞的杀伤率,使细胞凋亡增强,线粒体膜电位降低。这种作用可以被哇巴因抑制。结论nm23-H1可提高顺铂对舌癌细胞化疗的敏感性,其可能机制是nm23-H1降低线粒体膜电位,顺铂进入细胞内增加,导致细胞凋亡和坏死。     

EFFECTS OF ANTISENSE OLIGODEOXYNUCLEOTIDES ON EXPRESSION OF CASPASE-3 IN Γ-RADIATION INDUCED APOPTOTIC HL-60 CELLS

Objective To study the inhibitory effects of caspase-3 mRNA antisense oligodeoxynucleotides (ASODN) on expressions of caspase-3 and it's mRNA in γ-radiation induced apoptotic HL-60 cells, and screen the effective ASODN. Methods ASODN-1 and ASODN-2 targeting 5′-noncoding region and initial translation region of caspase-3 mRNA were respectively designed, synthesized and introduced into HL-60 cells by means of liposome-mediated transfection followed by 10Gy γ-radiation exposures. TUNEL assay was conducted to investigate the morphologic change and apoptotic percentage of HL-60 cells 18 h later. Immunocytochemical staining and one step RT-PCR were respectively performed to detect the expressions of caspase-3 and it's mRNA. Mismatched oligodeoxynucleotide (MODN) transfected and un-transfected HL-60 cells were taken as control. Results TUNEL assay found that the apoptotic percentages in ASODN-1 and ASODN-2 groups were significantly reduced compared with the control groups (P<0.01) when the final concentration of both ASODNs was ≥3μmol/L. Immunocytochemistry showed that caspase-3 positive cell percentages were reduced but the average gray values increased significantly compared with the control groups (P<0.01). RT-PCR showed expressions of caspase-3 mRNA was decreased after ASODN transfection. Furthermore, ASODN-1 proved more effective in inhibiting HL-60 cell apoptosis than ASODN-2 (P<0.01). Conclusion Caspase-3 mRNA ASODNs can prevent HL-60 cells from apoptosis induced by γ-radiation and reduce expression of caspase-3 and its mRNA. These effects are dose dependent in a certain range.     

Effects of Panax notoginseng saponins on hydrogen peroxide-induced apoptosis in cultured rabbit bone marrow stromal cells

Objective To investigate the effects of Panax notoginseng saponins (PNS) on hydrogen peroxide (H2O2)-induced apoptosis in cultured rabbit bone marrow stromal cells (BMSCs). Methods BMSCs from 3-month-old New Zealand rabbits were isolated and cultured by the density gradient centrifugation combined with adherent method. The cultured BMSCs were divided into three groups: normal control, H2O2 treatment (100μmol/L), and PNS pretreatment (0.1g/L). Intracellular reactive oxygen species (ROS) levels as the index of oxidative stress were measured by using 2'7'-dichlorodihydrofluorescein diacetate. Flow cytometry was used to observe the apoptosis of BMSCs by staining with annexinV-FITC/PI. The protein expression of Bax in BMSCs was analyzed by Western blotting. Activity of caspase-3 enzyme was measured by spectrofluorometry. Results Pretreatment with PNS significantly decreased intracellular ROS level induced by H2O2 (P<0.01). PNS markedly attenuated H2O2-induced apoptosis rate from 38.68% to 19.24%(P<0.01). PNS reversed H2O2-induced augmentation of Bax expression. Furthermore, PNS markedly reduced the altered in activity of caspase-3 enzyme induced by H2O2(P<0.01). Conclusion PNS has a protective effect on hydrogen peroxide-induced apoptosis in cultured rabbit BMSCs by scavenging ROS and decreasing Bax expression and caspase-3 activity.     

Changes of the cell cycle regulators and cell cycle arrest in cervical cancer cells after cisplatin therapy

Objective To investigate the changes of the cell cycle regulators ATM, Chk2 and p53 and cell cycle arrest in HeLa cells after cisplatin therapy. Methods The proliferation-inhibiting rates of HeLa cells induced by eisplatin of different concentrations were measured by MTT assays. The mRNA and protein expressions of ATM, Chk2 and p53 of HeLa cells with and withont cisplatin were detected by RT-PCR and Western blot, respectively. The cell cycle analysis was conducted by flow cytometric analysis. Results Cisplatin inhibited the proliferation of HeLa cells in a dose- and time-dependent manner. The mRNA and protein expressions of ATM, Chk2 and p53 were increased in HeLa cells treated with cisplatin. The cell cycle was arrested in G2/M phase in HeLa cells treated with cisplatin. Conclusion Activation of ATM, Chk2 and p53 might be critical in determining whether cells survive or undergo apoptesis. Targeting ATM, Chk2 and p53 pathway might he a promising strategy for reversing chemoresistance to clsplatin in cervical cancer.     

大黄素对模拟冷缺血再灌注后肝细胞内钙离子浓度及细胞凋亡的影响

目的 研究中药大黄素对模拟冷缺血再灌注后肝细胞内钙离子浓度及细胞凋亡的影响.方法 体外培养肝细胞株HL-7702,随机分为对照组和大黄素处理组.对照组未予大黄素处理,大黄素处理组按100、10、1 μmol/L分为高、中、低3个浓度组,建立模拟冷缺血再灌注模型,流式细胞技术检测各组细胞内钙离子浓度及细胞凋亡水平,分别检测各组细胞培养上清液乳酸脱氢酶水平.结果 冷缺血8 h再灌注6 h后,高、中、低浓度大黄素处理组钙离子荧光强度分别为(24.12±0.51)、(26.35±1.34)、(39.12±1.94),均显著低于对照组的105.29±1.01(P<0.01).高、中、低浓度大黄素处理组细胞凋亡率分别为(5.46±0.41)%、(10.64±0.64)%、(11.90±0.50)%,均显著低于对照组的(25.40±1.41)%(P<0.01).高、中浓度大黄素处理组上清液LDH含量分别为(179.67±18.57)u/L、(198.83±14.22)u/L,显著低于对照组的(351.33±34.16)u/L(P<0.01).结论 大黄素可降低模拟冷缺血再灌注后的肝细胞内钙离子浓度,抑制细胞凋亡,减轻肝细胞损伤.     

miRNA-449家族靶向CCNE2对胃癌细胞生长的抑制调节作用

目的研究miRNA-449在胃癌细胞中对细胞增殖、凋亡的影响,以及对靶基因CCNE2(cyclin E2)表达的影响。方法荧光定量PCR检测人低分化胃癌细胞株BGC823瞬时转染miRNA-449a/b及抑制剂后的表达;流式细胞术分析转染后细胞凋亡变化。Western blot检测miRNA-449a/b对靶基因表达的影响。结果在转染后,miRNA-449a/b组在48、72h对肿瘤细胞的增殖有明显的抑制作用(P<0.05),miRNA-449a/b组对肿瘤细胞凋亡有明显的促进作用(P<0.05),对CCNE2蛋白表达有显著抑制作用(P<0.05)。结论 miRNA-449a/b可能通过CCNE2来发挥其抑制胃癌细胞生长的作用。     

光动力疗法对人乳腺癌细胞MDA-MB-231凋亡的影响

目的探讨光动力疗法(PDT)对人乳腺癌细胞凋亡的影响。方法以人乳腺癌细胞株MDA-MB-231为研究对象,以血卟啉衍生物(HpD)为光敏剂,以630 nm波长激光为光源,采用连续照射的方式。将不同浓度HpD染色的MDA-MB-231细胞,照射不同剂量的激光后,用MTT法测定其A492值,选择最佳作用参数;电镜观察PDT作用后不同时间的细胞凋亡情况,并采用免疫组化方法检测促凋亡蛋白Bax和抗凋亡蛋白Bcl-2的表达情况。结果随着PDT作用后时间的延长,细胞凋亡现象越明显;Bax蛋白表达无明显变化(P>0.05),而Bcl-2蛋白表达自PDT后6 h起显著下降(P<0.01),PDT后6 h Bax/Bcl-2比值依次递增,且有统计学意义(P<0.05)。结论光动力疗法可诱导人乳腺癌细胞发生凋亡,其机制可能与Bax和Bcl-2蛋白表达的比值有关。     

人颗粒酶B融合蛋白基因的诱导表达导致HeLa细胞凋亡

目的　观察诱导表达的颗粒酶B融合蛋白对HeLa细胞形态和生长的作用。方法　用重组PCR法将活性型颗粒酶B基因序列的 5’端连接绿脓杆菌外毒素 (PE)的部分转位肽编码序列。所获融合蛋白基因克隆入pIND诱导表达载体后 ,与辅助质粒pVgRXR共转染HeLa细胞 ,经G4 18和zeocin筛选建系。间接免疫荧光检测蜕皮激素诱导后目的蛋白的表达 ,并通过电镜、TUNEL染色、细胞计数等方法观察细胞的形态和生长速度的变化。结果　建立了可诱导表达人颗粒酶B融合蛋白基因的HeLa细胞系。蜕皮激素诱导后检测到目的蛋白的表达 ,同时观察到细胞出现多核巨细胞的异常形态 ,细胞生长受到抑制。电镜和TUNEL分析表明 ,颗粒酶B融合蛋白基因的诱导表达使部分细胞呈现凋亡的典型特征。结论　颗粒酶B融合蛋白基因的诱导表达导致HeLa细胞凋亡     

EFFECT OF STENT ABSORBED c-myc ANTISENSE OLIGODEOXYNUCLEOTIDE ON SMOOTH MUSCLE CELLS APOPTOSIS IN RABBIT CAROTID ARTERY

Ｉｎｔｈｅｐａｓｔｆｅｗ ｙｅａｒｓ ,ｗｅｈａｖｅｗｉｔｎｅｓｓｅｄａｄｒａ ｍａｔｉｃ ｐｒｏｌｉｆｅｒａｔｉｏｎｉｎｔｈｅｕｓｅｏｆｉｎｔｒａｃｏｒｏｎａｒｙｓｔｅｎｔｓ.Ｓｔｅｎｔｓｎｏｗａｃｃｏｕｎｔｆｏｒｏｖｅｒ 70 %ｏｆｐｅｒｃｕｔａ ｎｅｏｕｓｔｒａｎｓｌｕｍｉｎａｌｃｏｒｏｎａｒｙａｎｇｉｏｐｌａｓｔｙ (ＰＴＣＡ ) .Ｈｏｗｅｖｅｒ,ｉｎ ｓｔｅｎｔｒｅｓｔｅｎｏｓｉｓｒｅｍａｉｎｓａｍａｊｏｒｐｒｏｂ ｌｅｍ ,ｏｃｃｕｒｉｎｇｉｎ 2 0 %～ 30 %ｏｆｔｈｅｓｅ ｐｒｏｃ ｅｄｕｒｅｓ[1-3] .Ｉ…     

Oleanolic acid-induced apoptosis and its relation with intracellular calcium in human lung adenocarcinoma A549 cells

Objective To investigate the effect of oleanolic acid (OA) on apoptosis, correlation between apoptosis and intracellular calcium, and its mechanism in human lung adenocarcinoma cell line A549. Methods Human lung adenocarcinoma A549 cells were incubated in vitro and assigned with OA concentrations of 0, 10, 20 and 40μg/mL. The apoptosis status of A549 cell line was detected with Annexin V-FITC/PI by flow cytometry (FCM); fluorescence intensity (FI) of A549 cells was assessed and the level of intracellular calcium was calculated at 24 hour of OA intervention. The relation between apoptosis and calcium FI was illustrated by curve fitting. Results FCM showed that 10, 20 and 40μg/mL of OA could induce A549 cell apoptosis, which followed a concentration-effect pattern; 24-hour intervention with 20μg/mL and 40μg/mL OA showed increased A549 cell apoptosis, and was significantly different from that with 0μg/mL OA (P<0.01). The FI of intracellular calcium concentration in 10, 20 and 40μg/mL OA groups was significantly higher than that in 0μg/mL group after 24 hours' intervention, and the FI showed a trend of increase with increased OA concentration (P<0.01). Curve fitting showed a significant correlation between apoptosis rate and intracellular calcium concentration in A549 cells (r=0.981, P<0.01). Regression equation was Y=0.508X-1.627. Conclusion OA plays a role in inducing apoptosis of human lung adenocarcinoma cells in a concentration-dependent manner. The OA-induced apoptosis is responsible for intracellular calcium overload of the tumor.