Ad.mda-7/IL-24的构建及在卵巢癌耐药癌细胞株中的感染表达

目的 利用Adeasy 1系统,构建并鉴定人mda-7/IL-24重组腺病毒(Ad.mda-7/IL-24).方法 从质粒pREP4-mda-7中扩增目的基因mda-7/IL-24,亚克隆至pAdTrack CMV穿梭质粒中,与pAdEasy 1质粒在E.coli BJ5183中进行同源重组为腺病毒载体质粒,线形化后转染293细胞进行包装扩增得到Ad.mda-7/IL-24.感染人卵巢癌泰素耐药株OVCAR-8/TR,Western-blot检测感染后MDA-7/IL-24蛋白表达.结果 重组腺病毒载体经测序、酶切电泳及感染后蛋白表达检测均表明成功构建Ad.mda-7/IL-24;病毒感染量为10 μL时,感染OVCAR-8/TR细胞可达100%感染率.细胞感染后可表达MDA-7/IL-24目的蛋白.结论 成功构建了人Ad.mda-7/IL-24,并能有效感染卵巢癌耐药细胞株,为进一步研究mda-7/IL-24基因在卵巢癌耐药中的作用奠定了基础.     

妇科肿瘤

应用基因芯片技术筛选卵巢癌紫杉醇耐药差异表达基因，肿瘤抑制基因DOC-2真核表达载体的构建及在卵巢癌细胞HO-8910中的表达鉴定，Ad．mda-7／IL-24的构建及在卵巢癌耐药细胞株中的感染表达，白细胞介素-6在卵巢癌诊断中的意义[编者按]     

人卵巢癌顺铂耐药细胞株OVCAR-3/DDP的建立及相关基因表达水平的研究

目的建立人卵巢癌顺铂耐药细胞株OVCAR-3/DDP,初步探讨其耐药机制。方法采用顺铂(DDP)浓度梯度递增诱导法,建立人卵巢癌OVCAR-3细胞株的顺铂耐药细胞株OVCAR-3/DDP;通过细胞计数和MTT法评估细胞增殖情况,流式细胞仪检测细胞周期情况,以评价OVCAR-3/DDP的生物学特性;采用RT-PCR法检测Mfn2、EGFR及MMP2 mRNA水平。结果成功建立了OVCAR-3/DDP顺铂耐药细胞株,其对DDP耐药指数是1.92;与亲本细胞株OVCAR-3相比,OVCAR-3/DDP生长速度减慢,倍增期是OVCAR-3细胞的1.36倍(P<0.05);流式细胞术检测结果显示细胞主要停滞于G2/M期(P<0.05);与OVCAR-3细胞相比,OVCAR-3/DDP细胞中Mfn2、EGFR及MMP2 mRNA水平均明显升高(P<0.05)。结论建立的OVCAR-3/DDP细胞株对顺铂耐药性稳定;OVCAR-3/DDP细胞对顺铂耐药可能与Mfn2、EGFR、MMP2基因转录水平上调有关。     

小片段RNA干扰提高人卵巢癌耐药细胞对化疗药物的敏感性研究

目的采用针对多药耐药基因MDR1的小片段RNA(siRNA)转染人卵巢癌耐药细胞株,了解转染后能否提高细胞对化疗药物的敏感性。方法用脂质体将合成针对MDR1的siRNA转染具有MDR1高表达的人卵巢癌泰素耐药细胞株OVCAR8/TR,并用ATP生物发光法检测转染前、后细胞对顺铂、5-氟脲嘧啶、阿霉素和泰素4种化疗药物敏感性的变化。结果OVCAR8/TR细胞对顺铂、阿霉素和泰素均耐药,转染后细胞能够明显提高通过P-gp转运药物泰素和阿霉素的敏感性,泰素对细胞的抑制率由转染前的26%提高到78%,阿霉素对细胞的抑制率则由转染前的37%提高到58%,对顺铂的耐药性则没有改变。单用脂质体转染组的药敏结果与未转染组差异无统计学意义。结论siRNA干扰能够逆转人卵巢癌化疗药物的多药耐药,提高对化疗药物的敏感性。     

川芎嗪对人卵巢癌耐药细胞株A2780/ADM逆转作用实验研究

目的 探讨川芎嗪(TMP)逆转卵巢癌A2780/ADM细胞对阿霉素(ADM)的耐药作用及机制.方法 应用MTT法测定细胞的药敏性;用荧光分光光度法测定细胞内阿霉素浓度的变化;采用流式细胞术检测耐药细胞凋亡率的变化.结果 非细胞毒性剂量川芎嗪能显著降低卵巢癌耐药细胞株A2780/ADM的IC50,逆转倍数为2.07倍;非细胞毒性剂量川芎嗪能显著增加耐药细胞内ADM的浓度和耐药细胞的凋亡百分率,显著降低P-gp的表达.结论 川芎嗪具逆转卵巢癌耐药细胞株A2780/ADM细胞对阿霉素的耐药性,其逆转机制可能与增加细胞内ADM浓度和抑制该细胞P-gp的表达有关.     

腺病毒介导黑色素瘤分化相关基因对乳腺癌细胞生长和凋亡的研究

目的 观察腺病毒介导黑色素瘤分化相关基因(mda-7/IL-24)对乳腺癌细胞生长和凋亡的作用.方法 将腺病毒mda-7/IL-24进行病毒的扩增、纯化和滴度测定.将纯化好的腺病毒mda-7/IL-24感染乳腺癌细胞,用Western印迹方法 检测mda-7/IL-24在乳腺癌细胞中的表达.结晶紫和4甲基偶氮唑蓝染色法(MTT)观察腺病毒mda-7/IL-24对乳腺癌细胞生长的影响;Hoechst染色和膜联蛋白(Aanexin)V检测腺病毒mda-7/IL-24对乳腺癌细胞凋亡的影响;并在裸鼠上进行了动物实验研究.结果 腺病毒mda-7/IL-24感染的乳腺癌细胞上清液中可以检测到mda-7/IL-24蛋白的表达;腺病毒mda-7/IL-24能明显地抑制乳腺癌细胞的生长,Hochest染色和Annexin V提示腺病毒mda-7/IL-24促进乳腺癌细胞的凋亡.实验进一步证明了腺病毒mda-7/IL-24可以显著抑制裸鼠乳腺癌荷瘤的生长.结论 腺病毒mda-7/IL-24能显著抑制乳腺癌细胞的生长并诱导乳腺癌细胞的凋亡.     

1mda-7/IL-24基因致肝癌细胞凋亡及增强其对ADM化疗敏感性的机制研究

目的探讨mda-7/IL-24基因致肝癌细胞凋亡及增强其对ADM化疗敏感性的具体机制。方法通过携带人mda-7/IL-24基因的腺病毒载体Ad.mda-7转染肝癌细胞系HepG2和正常肝细胞系L02以及与经ADM处理的HepG2和L02细胞。通过流式细胞仪检测各组细胞中活性氧(ROS)的表达变化及Annexin-V和PI双染后细胞凋亡量的变化。通过Realtime PCR及western blot方法检测各组细胞中mda-7、Bcl-2、Bax、ALDH1以及MDR1基因和蛋白的变化。结果 mda-7/IL-24基因在肝癌细胞系HepG2中大量表达,其ROS表达增强、凋亡量增加,Bcl-2、ALDH、MDR-1基因和蛋白表达下调,Bax基因和蛋白表达上调。对正常肝细胞系L02无以上变化。结论 mda-7/IL-24基因可致肝癌细胞系HepG2凋亡,并增强其对ADM的化疗敏感性。而对正常肝细胞系L02无此作用。     

结直肠癌多药耐药细胞株的建立及其特性的初步探讨

目的 建立人结直肠癌LOVO细胞多药耐药细胞株LOVO/5-FU,并探讨其生物学特性及耐药机制.方法 人结直肠癌细胞系LOVO在体外与2.5 μg/ml 5-氟尿嘧啶（5-FU）作用,诱导成功LOVO/5-FU耐药细胞株,体外细胞毒性实验观察它们对5-FU,MMC,ADM,DDP,MTX,Arac等6种药物敏感性.用噻唑蓝（MTT）法、光镜及电镜观察两种细胞的形态及结构差异,绘制两种细胞的体外生长曲线.电镜对耐药细胞株LOVO/5-FU及敏感细胞株LOVO进行5-FU诱导细胞凋亡的实验研究.结果 成功的建立耐药细胞系LOVO/5-FU,该细胞系对5-FU的耐药指数为16.48,对MMC,DDP和ADM有交叉耐药性,但对MTX,Arac仍保持与LOVO细胞几乎相同的敏感性.在脱离5-FU体外冻存10个月,其耐药性可保持60%.结论 本研究成功的建立LOVO/5-FU多药耐药细胞株,其耐药性稳定,是研究大肠癌MDR的理想模型.     

结肠癌耐药细胞株LoVo/5-Fu中microRNA表达的初步研究

目的 建立结肠癌细胞耐药模型LoVo/5-FU并初步筛选可能的耐药相关的microRNA.方法 采用5-FU浓度递增法建立人结肠癌细胞耐药模型LoVo/5-FU,观察其生长规律并绘制细胞生长曲线;用MTT法鉴定耐药细胞株耐药性并计算耐药指数(RI);用microRNA芯片技术检测耐药细胞株LoVo/5-FU与其亲本细胞株LoVo中mi-croRNA的表达谱,筛选差异表达的microRNA;用实时荧光定量PCR方法对筛选出的部分差异microRNA在耐药细胞及其亲本细胞中的表达情况进行验证.结果 LoVo/5-FU细胞与LoVo细胞相比,生长缓慢,细胞体积增大,耐药株LoVo/5-FU细胞相对于其亲本LoVo细胞的耐药倍数为8.08.microRNA芯片的结果显示,耐药株LoVo/5-FU细胞与亲本LoVo细胞比较,有10个microRNA表达上调,13个microRNA表达下调;实时荧光定量pcr的结果进一步证实mir-210、mir196a、mir-1281在LoVo/5-FU中显著上调,而let-7fmir-1228显著下调,其中mir-210在LoVo/5-FU与LoVo中的表达有明显差异.结论 LoVo/5-FU细胞株耐药性稳定,筛选获得的差异miRNA可能通过调控其靶基因而参与人结肠癌细胞对5-Fu的耐药,为进一步研究microRNA在结肠癌耐药机制中的作用奠定基础.     

膀胱癌多药耐药细胞株Pumc-91/ADM的建立及其生物学特性评价

目的 多药耐药(multidrug-resistance,MDR)是肿瘤治疗的主要障碍.为探讨体外肿瘤MDR的方法,本研究建立膀胱移行上皮癌多药耐药细胞株Pumc-91/ADM,并研究其生物学特性.方法 以人膀胱移行上皮癌细胞株Pumc-91为研究对象,应用阿霉素(ADM)浓度梯度递增法体外诱导建立人膀胱移行上皮细胞癌Pumc-91细胞的多药耐药细胞株Pumc-91/ADM.观察细胞的生长规律,用MTT法检测多药耐药性,流式细胞仪检测其生长周期及细胞内药物ADM荧光强度,反转录RT-PCR半定量检测耐药相关基因的mRNA表达量.结果 Pumc-91/ADM与亲本细胞Pumc-91相比其生长速度减慢,倍增期延长,细胞异型性明显,巨细胞增多.MTT法检测显示Pumc-91/ADM较Pumc-91细胞对ADM的耐受度提高了10倍,且对氨甲蝶呤、顺铂、表阿霉素、长春新碱均有不同程度的交叉耐药性.流式细胞术检测细胞内荧光强度Pumc-91/ADM较Pumc-91细胞明显降低,细胞周期中S期细胞减少,G1、G2期细胞增多.RT/PCR检测耐药相关基因结果显示耐药细胞株谷胱甘肽-S-转移酶基因表达明显高于亲本细胞.结论 耐药株Pumc-91/ADM具有典型的多药耐药特点,可以为膀胱癌的多药耐药研究提供一个较好的体外研究模型.     

Replication-incompetent Adenovirus Vector-mediated MDA-7/IL-24 Selectively Induces Growth Suppression and Apoptosis of Hepatoma Cell Line SMMC-7721

In order to investigate the effect of replication-incompetent adenovirus vector expressing MDA-7/IL-24 on tumor growth and apoptosis of human hepatocellular carcinoma （HCC） cell line SMMC-7721 and normal liver cell line L02, the recombinant replication-incompetent Ad.mda-7 virus vector was constructed and infected into the HCC cell line SMMC-7721 and normal liver cell line L02. RT-PCR was performed to examine the expression of MDA-7 mRNA. The concentrations of MDA-7/IL-4 in culture superuatants were determined by using ELISA. MTT and Hoechst staining assay were applied to observe the inhibitory and killing effects of MDA-7 on the HCC cells. By using flow cytometry, the apoptosis, cell cycle and proliferation of SMMC-7721 and L02 cells were measured. The results showed recombinant replication-incompetent virus expressing MDA-7/IL-24 was constructed successfully, and RT-PCR revealed that it could mediate the high expression of the exogenous gene MDA-7/IL-24 in SMMC-7721 and L02 cells. The expression of MDA-7/IL-24 proteins in the culture superuatant was detectable by ELISA. Ad.mda-7 infection induced apoptosis and growth suppression in SMMC-7721 cells and an increased percentage of HCC cells in the GyM phase of the cell cycle, but not in L02 cells. It was concluded that mda-7/IL-24 gene, mediated with replication-incompetent adenovirus vector, could selectively induce growth suppression and apoptosis in HCC cell line SMMC-7721 but without any toxic side-effect on normal liver line L02.     

mda-7/IL-24通过内质网应激通路诱导肝癌细胞生长抑制和凋亡

目的:观察mda-7/IL-24对不同类型的肝肿瘤细胞及正常肝脏细胞增殖及凋亡的影响并探讨其可能的作用机制.方法:构建携带mda-7基因的重组腺病毒Ad-mda-7,转染肝癌细胞系HepG2、Hep3B、PLC/PRF/5和正常肝细胞L02,MTT法和流式细胞术检测细胞增殖及凋亡情况,Western印迹检测细胞相关蛋白的表达.应用钙蛋白酶抑制剂Ⅰ (ALLN,25 μmol/L)预处理上述细胞30 min,观察阻断内质网应激通路后上述指标的变化.结果:MTT法和流式细胞术检测结果表明,与感染Ad-GFP比较,Ad-mda-7选择性抑制肝癌细胞生长(P<0.01),诱导肝癌细胞凋亡(P<0.01,其中对HepG2细胞影响最明显),而对正常肝细胞生长无明显影响;ALLN预处理能部分抑制Ad-mda-7的上述作用.Western印迹结果表明Ad-mda-7 能诱导HepG2细胞BiP/GRP78、Bax蛋白高表达(P<0.01),caspase-12、caspase-3活化及p38 MAPK磷酸化;ALLN预处理能抑制Ad-mda-7转染引起的Bax蛋白高表达及caspase-12、caspase-3活化;而对BiP/GRP78的高表达及p38 MAPK磷酸化无影响.结论:mda-7/IL-24可能通过内质网应激通路诱导肝癌细胞生长抑制和凋亡.     

不同化疗耐药性卵巢癌细胞侵袭转移特性的比较

目的观察不同化疗耐药性卵巢癌细胞的侵袭转移特性,并探讨其可能机制。方法体外建立卵巢癌不同梯度顺铂(DDP)耐药细胞系模型(OVCAR-3/DDP-1、OVCAR-3/DDP-2、OVCAR-3/DDP-3);MTT法、流式细胞仪、Transwell小室观察亲本细胞和耐药细胞的增殖、细胞周期分布、细胞侵袭和迁移等生物学特性的变化;ELISA法测定细胞培养上清液中基质金属蛋白酶-2(MMP-2)、组织金属蛋白酶抑制因子-2(TIMP-2)、基质金属蛋白酶-9(MMP-9)、组织金属蛋白酶抑制因子-1(TIMP-1)的浓度。结果成功建立不同梯度顺铂耐药细胞系模型,OVCAR-3/DDP-1、DDP-2、DDP-3细胞的耐药指数依次为3.87、8.39、13.42。耐药细胞均较亲本细胞增殖缓慢,G0/G1期细胞比例增加,S期细胞比例减少,其中OVCAR-3/DDP-2、DDP-3与亲本细胞比较差异有统计学意义(P<0.05)。与亲本细胞相比,耐药细胞伴随其耐药性的增加,侵袭转移能力逐渐增强,其中OVCAR-3/DDP-2、DDP-3与亲本细胞相比差异有统计学意义(P<0.05)。细胞上清液中MMP-2/TIMP-2、MMP-9/TIMP-1的比值随顺铂耐药性的增加而逐渐上升,耐药细胞与亲本细胞相比差异均有统计学意义(P<0.05)。结论对顺铂耐药性的产生和增加可促进卵巢癌细胞的侵袭和转移,可能部分与耐药细胞MMP-2/TIMP-2、MMP-9/TIMP-1比值上调有关。     

The Relationship between p38MAPK and Apoptosis during Paclitaxel Resistance of Ovarian Cancer Cells

To investigate the relationship between p38 mitogen-activated protein kinase (p38MAPK) and cell apoptosis during the paclitaxel resistance of ovarian carcinoma cell lines, flow cytometry (FCM) and PI staining were employed to determine the effect of p38MAPK inhibitor SB203580 on the apoptosis of A2780/Taxol cells, a drug-resistant human ovarian carcinoma cell line. p38MAPK protein expression in SB203580-treated cells was immunochemically measured. The 50% inhibition concentration (IC50) of paclitaxel on A2780/Taxol cells was determined by MTT assay. MDR-1 mRNA, and expression of p38MAPK and phospho-p53 protein were detected by RT-PCR and West- ern blotting, respectively. The apoptosis rate of A2780/Taxol cells was (19.7±1.04)% 24 h after SB203580 treatment. A significant difference in apoptosis rate was found among experiment group, control group and untreated group (P<0.05). The relative reversal rate of A2780/Taxol cells to pacli- taxel was (57.18±2.01)%. As compared with the control group and the untreated group, p38MAPK protein and MDR-1 mRNA in SB203580-treated cells was substantially decreased. The expression of p53 protein was significantly increased. It is concluded that p38MAPK pathway is related to pacli- taxel resistance of ovarian carcinoma, and blockade of this pathway can promote the apoptosis of the drug-resistant cells and reverse the drug-resistance. Moreover, p38MAPK-mediated apoptosis in pa- clitaxel-resistant ovarian carcinoma cells depends on the activation of p53.     

The Relationship between p38MAPK and Apoptosis during Paclitaxei Resistance of Ovarian Cancer Cells

To investigate the relationship between p38 mitogen-activated protein kinase (p38MAPK) and cell apoptosis during the paclitaxel resistance of ovarian carcinoma cell lines, flow cytometry (FCM) and PI staining were employed to determine the effect of p38MAPK inhibitor SB203580 on the apoptosis of A2780/Taxol cells, a drug-resistant human ovarian carcinoma cell line. p38MAPK protein expression in SB203580-treated cells was immunochemically measured. The 50% inhibition concentration (IC(50)) of paclitaxel on A2780/Taxol cells was determined by MTT assay. MDR-1 mRNA, and expression of p38MAPK and phospho-p53 protein were detected by RT-PCR and Western blotting, respectively. The apoptosis rate of A2780/Taxol cells was (19.7+/-1.04)% 24 h after SB203580 treatment. A significant difference in apoptosis rate was found among experiment group, control group and untreated group (P<0.05). The relative reversal rate of A2780/Taxol cells to paclitaxel was (57.18+/-2.01)%. As compared with the control group and the untreated group, p38MAPK protein and MDR-1 mRNA in SB203580-treated cells was substantially decreased. The expression of p53 protein was significantly increased. It is concluded that p38MAPK pathway is related to paclitaxel resistance of ovarian carcinoma, and blockade of this pathway can promote the apoptosis of the drug-resistant cells and reverse the drug-resistance. Moreover, p38MAPK-mediated apoptosis in paclitaxel-resistant ovarian carcinoma cells depends on the activation of p53.     

The relationship between p38MAPK and apoptosis during paclitaxel resistance of ovarian cancer cells

Summary To investigate the relationship between p38 mitogen-activated protein kinase (p38MAPK) and cell apoptosis during the paclitaxel resistance of ovarian carcinoma cell lines, flow cytometry (FCM) and PI staining were employed to determine the effect of p38MAPK inhibitor SB203580 on the apoptosis of A2780/Taxol cells, a drug-resistant human ovarian carcinoma cell line. p38MAPK protein expression in SB203580-treated cells was immunochemically measured. The 50% inhibition concentration (IC₅₀) of paclitaxel on A2780/Taxol cells was determined by MTT assay. MDR-1 mRNA, and expression of p38MAPK and phospho-p53 protein were detected by RT-PCR and Western blotting, respectively. The apoptosis rate of A2780/Taxol cells was (19.7±1.04)% 24 h after SB203580 treatment. A significant difference in apoptosis rate was found among experiment group, control group and untreated group (P<0.05). The relative reversal rate of A2780/Taxol cells to paclitaxel was (57.18±2.01)%. As compared with the control group and the untreated group, p38MAPK protein and MDR-1 mRNA in SB203580-treated cells was substantially decreased. The expression of p53 protein was significantly increased. It is concluded that p38MAPK pathway is related to paclitaxel resistance of ovarian carcinoma, and blockade of this pathway can promote the apoptosis of the drug-resistant cells and reverse the drug-resistance. Moreover, p38MAPK-mediated apoptosis in paclitaxel-resistant ovarian carcinoma cells depends on the activation of p53. This project was supported by a grant from R&D program of Heilongjiang Province (No. GB05C402-11).     

细胞外信号激酶在泰素引起的卵巢癌细胞凋亡中的作用

目的探讨细胞外信号激酶(ERK)在紫杉醇引起的卵巢癌细胞调亡中的作用.方法用紫杉醇处理人卵巢上皮性腺癌细胞株Caov-3 and Skov-3,应用二氨基联苯染色,在显微镜下观察其凋亡.应用蛋白印迹法技术,用特异性识别双磷酸化ERK1/2的抗体,检测卵巢癌细胞经泰素作用后ERK1/2的活化情况.用MTT法检测PD98059对泰素引导的卵巢癌细胞毒性的影响.结果在80 nM泰素导致Caov-3和Skov3细胞凋亡和ERK1/2激活,泰素作用9h后,出现ERK的激活,15h后活性最大.用100μM的PD 98059作用于不同药物浓度(60nM和80nM)的泰素作用的细胞,细胞存活率显著降低(P＜0.05).结论泰素能激活卵巢癌Caov-3和Skov3细胞ERK.抑制ERK的活性能提高Caov-3和Skov3细胞对泰素的敏感性.阻断MEK1/ERK信号转导通路,可以增加泰素对卵巢癌的细胞毒作用.