低频超声联合苦参素对人卵巢癌OVCAR-3细胞生物学特性影响

目的研究低频超声和苦参素联合应用对人卵巢癌OVCAR-3细胞生物学行为的影响。方法培养人卵巢癌OVCAR-3细胞,采用随机分组分为4组:对照组、低频超声组、苦参素组和联合组(低频超声+苦参素)。分别给予如下处理:低频超声组为超声840 k Hz,0.75 W/cm~2×3 min辐照;苦参素组为药物浓度为10 mg/ml培养24 h;联合组叠加处理因素。应用CCK-8检测各组细胞增殖;流式细胞仪检测各组细胞凋亡;Transwell实验检测细胞侵袭能力。结果单独应用低频超声或苦参素均可抑制OVCAR-3细胞增殖、诱导细胞凋亡、促进细胞侵袭。与单独应用组相比,低频超声和苦参素联合,上述作用显著增强。结论低频超声可增强苦参素诱导的抑制卵巢癌细胞增殖、侵袭能力以及诱发凋亡的作用。     

60Coγ射线照射诱导人卵巢癌细胞凋亡及细胞周期的改变

目的：探讨^60Coγ射线照射对人卵巢癌细胞株A2780及其顺铂耐药株A2780－CP体外生长、凋亡及细胞周期的影响。方法：采用四甲基偶唑蓝（MTT）比色法分析不同辐照剂量（1－10Gy)对A2780及A2780－CP两种细胞株体外生长的影响,用流式细胞术（FCM）比较两者辐照后凋亡及细胞周期的变化。结果：（1）1－10^60Coγ射线照射引起A2780细胞株明显的生长抑制和凋亡,而A2780－CP细胞则表现出明显的辐照抗性。（2）6Gy ^60Coγ射线照射后6－48hA1780细胞呈现G1期细胞阻滞和S期细胞比较下降,A2780－CP细胞则呈G1期细胞比例减少和S期细胞比例增加。结论卵癌耐药细胞具有辐射抗性和物征性的细胞周期变化,流式细胞术测定辐照诱导肿瘤细胞凋讯及细胞周期的变化可预测恶性肿瘤细胞的辐射敏性。     

葡萄籽原花青素联合顺铂对喉癌细胞Hep-2生物学作用及机制研究

目的利用葡萄籽原花青素及其联合顺铂在体外作用于喉癌细胞Hep-2,观察其对喉癌细胞增殖、凋亡的影响,并探讨抗肿瘤作用的可能机制。方法 MTT法检测各组药物对喉癌细胞增殖的抑制作用;流式细胞仪检测细胞周期;TUNEL法检测各组药物对喉癌细胞凋亡率的影响;采用流式细胞仪分析凋亡细胞比例,Western blot法检测各组药物对喉癌细胞Bax/Bcl-2表达情况的影响。结果 MTT和TUNEL结果显示,GSPE+顺铂组的喉癌细胞抑制增殖作用明显高于单纯GSPE组和单纯顺铂组,差异均有统计学意义(P<0.05);细胞周期结果显示,GSPE+顺铂组处于S+G2M期的细胞数明显低于单纯GSPE和单纯顺铂组,差异均有统计学意义(P<0.05);蛋白表达结果显示,GSPE+顺铂组的Bax/Bcl-2的表达明显高于单纯GSPE组和单纯顺铂组,差异均有统计学意义(P<0.05)。结论葡萄籽原花青素可诱导喉癌Hep-2细胞凋亡;与单纯应用葡萄籽原花青素或顺铂比较,葡萄籽原花青素联合顺铂可以起到更好的增殖抑制并诱导喉癌细胞凋亡,两者具有协同作用。     

白英水提物诱导人卵巢癌A2780细胞bcl-2基因表达的影响

目的：观察白英水提物诱导人卵巢癌A2780细胞凋亡的作用,初步探讨其分子机制。方法：常规方法制备白英水提物,体外培养人卵巢癌A2780细胞,MTT法提示其有较强的体外抑制A2780细胞作用。采用半定量RT—PCR法检测凋亡相关基因bcl-2表达。实验组设白英水提物12．5、25．0、50．0mg／ml 3种浓度,以顺铂（25．0μg／ml）为阳性对照组。结果：白英水提物对A2780细胞增殖有抑制作用,且呈明显的量效关系,半定量RT—PCR法检测显示bcl-2 mRNA表达下调,诱导其发生凋亡。结论：白英水提物对A2780细胞有较强的增殖抑制和诱导凋亡作用,其诱导A2780细胞凋亡的分子机制可能与下调bcl-2基因表达有关。     

索拉非尼联合顺铂抑制肝癌HepG2细胞生长的体外研究

目的探讨索拉非尼联合顺铂(DDP)对肝癌细胞HepG2生长的抑制作用及其可能的分子机制。方法实验细胞分为4组:空白对照组、索拉非尼单药组、顺铂单药组、索拉非尼联合顺铂组。索拉非尼和顺铂单独或联合作用于细胞,以MTT法检测24、48、72、96h时间点药物对HepG2细胞的增殖抑制率,流式细胞仪检测24、48h时间点的细胞周期与凋亡率。在药物作用后24h,用荧光染料罗丹明123(Rh123)染色细胞,流式细胞仪测定线粒体跨膜电位(ΔΨm),分光光度法检测caspase-3活性。结果索拉非尼及顺铂单独应用对HepG2生长均有抑制作用,且低剂量联合具有协同作用。联合用药可以使细胞周期阻滞于G0/G1期和G2期,且凋亡率明显高于单药组(P<0.05)。单独应用顺铂和索拉非尼均能使线粒体跨膜电位降低,而联合组作用强于单药组(P<0.05)。药物作用后caspase-3活性增高,联合组高于单药组(P<0.05)。结论索拉非尼联合顺铂能更好地抑制肝癌HepG2细胞增殖,并促进其凋亡,其机制可能与细胞周期阻滞、线粒体跨膜电位降低及caspase-3活性增加有关。     

黄荆子乙酸乙酯提取物增强顺铂诱导卵巢癌细胞株COC1凋亡的作用

目的观察黄荆子乙酸乙酯提取物（the acetoacetate extract of Vitexnegundoseed,Evn-50）和顺铂（cisplatin,DDP）在体外对人卵巢癌细胞株COC1凋亡的影响,探讨Evn-50提高COC1细胞株对顺铂化疗敏感性的机制。方法Evn-50,DDP以及两药联合分别处理人卵巢癌COC1细胞株,台盼蓝染色计数法检测药物对细胞生长的抑制率,并用流式细胞术、AO/CB荧光双染色法测Evn-50,DDP以及两药联合对细胞凋亡的影响。结果细胞抑制率在联用组中随Evn-50剂量的增加而增加,且明显高于同剂量单用组（P〈0.01）;细胞凋亡率在联用组中随Evn-50剂量的增加而增加,且高于同剂量单用组（P〈0.01）,流式细胞仪分析结果显示Evn-50呈浓度依赖性将COC1细胞阻滞在G2/M期,而DDP将COC1细胞阻滞在G1/S期。结论Evn-50有增强顺铂诱导卵巢癌细胞株COC1凋亡的作用,其机制可能与二者对卵巢癌细胞株COC1周期阻滞点不同有关。     

~(60)Coγ射线照射诱导人卵巢癌细胞凋亡及细胞周期的改变

目的　探讨6 0 Coγ射线照射对人卵巢癌细胞株A2 780及其顺铂耐药株A2 780 CP体外生长、凋亡及细胞周期的影响。方法　采用四甲基偶唑蓝 (MTT)比色法分析不同辐照剂量 (1～10Gy)对A2 780及A2 780 CP两种细胞株体外生长的影响 ,用流式细胞术 (FCM)比较两者辐照后凋亡及细胞周期的变化。结果　 (1) 1～ 10Gy6 0 Coγ射线照射引起A2 780细胞株明显的生长抑制和凋亡 ,而A2 780 CP细胞则表现出明显的辐照抗性 .(2 ) 6Gy6 0 Coγ射线照射后 6～ 48hA2 780细胞呈现G1 期细胞阻滞和S期细胞比例下降 ,A2 780 CP细胞则呈G1 期细胞比例减少和S期细胞比例增加。结论卵巢癌耐药细胞具有辐射抗性和特征性的细胞周期变化 ,流式细胞术测定辐照诱导肿瘤细胞凋亡及细胞周期的变化可预测恶性肿瘤细胞的辐射敏感性。     

染料木黄酮联合5-FU对结肠癌HCT-116细胞株增殖及凋亡的影响

目的探讨染料木黄酮联合5-氟尿嘧啶对HCT-116细胞增殖和凋亡的影响及其可能的作用机制。方法经不同浓度的Gen和(或)5-FU处理HCT-116细胞后,用MTT法检测细胞的生长抑制效应;流式细胞术检测细胞凋亡和细胞周期变化情况;RT-PCR检测Suvivin表达水平。结果 Gen与5-FU联合应用后能明显抑制细胞增殖,诱导细胞凋亡,使细胞发生S期阻滞,均较对照组和单用药组作用增强,并且下调了Suvivin的mRNA表达,差异具有统计学意义(P<0.05)。结论 Gen可抑制结肠癌HCT-116细胞的增殖,将细胞阻滞于S期,并诱导细胞的凋亡,与5-FU联合应用具有显著协同效应,其机制可能与下调Suvivin表达有关。     

2-羟基-3-甲基蒽醌联合紫杉醇对卵巢癌细胞Caspase-8、Caspase-9及Caspase-3表达影响

目的研究中药白花蛇舌草的有效成分2-羟基-3-甲基蒽醌联合紫杉醇对人卵巢癌细胞A2780生长的抑制作用和细胞凋亡的影响,以探讨两药联合对A2780细胞的作用机制。方法将对数生长期的A2780细胞随机分为空白对照组(A组)、B组(紫杉醇3μg/ml)、C组(2-羟基-3-甲基蒽醌50μM)和D组(2-羟基-3-甲基蒽醌50μM+紫杉醇3μg/ml)。采用MTT法检测各组细胞的活性,Annexin V-FITC/PI双染法检测细胞凋亡率;采用荧光比色法测定Caspase-8、Caspase-9和Caspase-3蛋白酶的活性。结果与A组比较,B、C、D组对A2780细胞均有明显的抑制生长及诱导凋亡作用;D组对A2780细胞的抑制及诱导凋亡作用显著高于C组或B组(P<0.05);各组抑制率及凋亡率均呈时间依赖性(P<0.05)。Caspase-8、Caspase-9和Caspase-3蛋白酶的表达从A~D组呈逐渐升高的趋势。结论 2-羟基-3-甲基蒽醌可协同紫杉醇促进A2780细胞凋亡,其机制可能是通过增加Caspase-8、Caspase-9和Caspase-3的表达。     

乳腺癌缺失基因1对肝癌生物学行为的影响

目的探讨乳腺癌缺失基因1（deleted in breast cancer 1,DBC1）对肝癌细胞增殖和凋亡的影响。方法构建pcDNA3.1-DBC1的正义表达载体,转染肝癌细胞SMMC-7721,MTT法检测DBC1对肝癌细胞SMMC-7721生长增殖的影响,采用流式细胞术（FCM）检测DBC1对肝癌细胞SMMC-7721的细胞周期和细胞凋亡的影响。结果与转染空载体的SMMC-7721细胞相比,pcDNA3.1-DBC1正义表达载体转染上调DBC1的表达,可显著抑制肝癌细胞（SMMC-7721）增殖,升高G1期细胞比例（51.0%vs 64.9%,P=0.002）,降低S期细胞比例（29.7%vs 14.0%,P〈0.001）,诱导细胞凋亡（8.8%vs 24.6%,P〈0.001）。结论 DBC1通过抑制肿瘤细胞增殖,阻滞细胞周期进展,促进细胞凋亡,抑制肝癌的发生和发展。     

Evaluation of cisplatin treatment given concurrently with pulsed irradiation in cisplatin sensitive and resistant human ovarian carcinoma cell lines

The aim was to investigate the effect of combined treatment of cisplatin with acute or pulsed radiation in human ovarian carcinoma cells sensitive and resistant to cisplatin. Human ovarian cancer cell parental line A2780s and a derivative cisplatin-resistant line A2780cp were given cisplatin treatment before a single acute dose irradiation or concurrently during a pulsed-dose irradiation sequence. Cells were irradiated in the confluent state, trypsinized and plated after treatment. When the combined treatment for cisplatin was given before acute irradiation, the results showed additive to superadditive effects for both cell lines. However, the superadditivity was only significant in the sensitive cell line. For the concomitant treatment of cisplatin during pulsed-dose irradiation the results were additive, except for the highest cisplatin dose in the A2780cp line where subadditivity was observed. The results indicate that the combined treatments could be clinically useful even though the results are mostly not superadditive. However, high-dose cisplatin (3 microg ml(-1)) caused a subadditive effect in the resistant cell lines for pulsed irradiation. Thus, high-dose cisplatin to overcome resistance is not effective. Cisplatin with both acute and pulsed irradiation showed additive effects indicating no advantage of using cisplatin in pulsed irradiation where sublethal damage repair may be greater.     

Evaluation of cisplatin treatment given concurrently with pulsed irradiation in cisplatin sensitive and resistant human ovarian carcinoma cell lines

The aim was to investigate the effect of combined treatment of cisplatin with acute or pulsed radiation in human ovarian carcinoma cells sensitive and resistant to cisplatin. Human ovarian cancer cell parental line A2780s and a derivative cisplatin-resistant line A2780cp were given cisplatin treatment before a single acute dose irradiation or concurrently during a pulsed-dose irradiation sequence. Cells were irradiated in the confluent state, trypsinized and plated after treatment. When the combined treatment for cisplatin was given before acute irradiation, the results showed additive to superadditive effects for both cell lines. However, the superadditivity was only significant in the sensitive cell line. For the concomitant treatment of cisplatin during pulsed-dose irradiation the results were additive, except for the highest cisplatin dose in the A2780cp line where subadditivity was observed. The results indicate that the combined treatments could be clinically useful even though the results are mostly not superadditive. However, high-dose cisplatin (3 μg ml^???1) caused a subadditive effect in the resistant cell lines for pulsed irradiation. Thus, high-dose cisplatin to overcome resistance is not effective. Cisplatin with both acute and pulsed irradiation showed additive effects indicating no advantage of using cisplatin in pulsed irradiation where sublethal damage repair may be greater.     

青藤碱联合顺铂对顺铂耐药Hela细胞株增殖凋亡的作用

目的 探讨青藤碱联合顺铂对顺铂耐药Hela细胞株增殖凋亡的作用.方法 取对数期Hela细胞,建立顺铂耐药模型,分为对照组、青藤碱组、激活剂组、青藤碱联合激活剂组.对照组不处理,青藤碱组加入青藤碱(40μmol/L终浓度),激活剂组加入Notch信号通路配体Jagged1蛋白(500 ng/ml),青藤碱联合激活剂组加入...     

腺病毒介导的RNA干扰ERCC1基因表达对逆转卵巢癌顺铂耐药的效果

 目的 探讨腺病毒介导的RNA干扰ERCC1基因表达逆转卵巢癌顺铂耐药的效果。方法 采用直接感染法、台盼蓝活细胞计数、MTT、Hoechst染色法及流式细胞仪检测等方法,绘制顺铂耐药卵巢癌细胞株SKOV3/DDP细胞生长曲线及倍增时间,检测SKOV3/DDP细胞感染重组病毒前后其顺铂的IC₅₀值、细胞凋亡形态及细胞各周期的分布。结果 (1)顺铂浓度与SKOV3/DDP细胞抑制率呈线性正相关,相关系数r=0.9862(P<0.05),顺铂IC₅₀为(13.93±0.37)μg/ml,耐药指数为1.79。(2)重组腺病毒感染后干扰ERCC1基因表达,SKOV3/DDP细胞对顺铂的敏感性分别增加了11.1%、16.7%、26.4%、33.5%,呈剂量依懒性(r=0.9716,P<0.05),耐药指数降至1.19。(3)重组腺病毒联合顺铂作用后,SKOV3/DDP细胞株G₁期细胞比例增大,S期细胞比例增大,细胞凋亡率增高(P<0.05)。结论 干扰ERCC1基因表达可以通过诱导耐药肿瘤细胞SKOV3/DDP凋亡、调节细胞周期分布等途径逆转卵巢癌细胞的顺铂耐药。     

Combination of static magnetic field and cisplatin in order to reduce drug resistance in cancer cell lines

Abstract

Purpose: In this study, the effects of different intensities of Static Magnetic Fields (SMFs) (10, 15 and 25?mT) and different concentrations of cisplatin drug were investigated on the viability percent and IC₅₀ of the A2780 and A2780-CP cell lines at 24, 48 and 96?h to show useful potential of SMF as a physical agent to enhance the effectiveness of common therapeutic approaches and decrease of drug resistance to cisplatin anticancer drug.

Materials and methods: Magnetic field exposure was performed using a locally designed generator. The cell viability percent, IC₅₀ and cisplatin uptake in treated cells were evaluated by MTT assay and inductively coupled plasma (ICP), respectively.

Results: Increasing of concentration and time of cisplatin drug showed a noticeable decrease in viability percent in sensitive and resistant cell lines compared with control group. These decreases were more significant in resistant cells compared with sensitive cells. The obtained IC₅₀ values for resistant were greater than the values obtained for A2780 cells. ICP analysis demonstrated an increased uptake of cisplatin after treatment for 48 and 96?h relative to untreated groups in both resistant and sensitive cells.

Conclusion: Results showed that A2780 cells were more sensitive to cisplatin than A2780-CP. Studies have shown that SMF can increase the effect of cisplatin on cell viability percent and decrease the resistance of A2780-CP cells by producing large, verruca shaped structures at the surface of the cell membrane.     

SC-58236与顺铂联合调控人肺腺癌A549细胞增殖及肺癌移植瘤生长的作用

目的：观察高选择性COX-2抑制剂SC-58236和顺铂联合对人肺腺癌A549细胞增殖及移植瘤生长的影响。方法：采用MTT法观察A549细胞增殖,同时用PTENsiRNA转染A549细胞,并将其接种裸鼠,观察SC-58236和／或顺铂对A549细胞增殖及移植瘤生长的影响。结果：SC-58236可增强顺铂对A549细胞增殖及其对移植瘤生长的抑制作用,并协同促进细胞及瘤组织内PTEN蛋白表达（P〈0．01）。PTENsiRNA转染可减弱顺铂与SC-58236对A549细胞增殖及肿瘤生长的抑制作用（P〈0．01）。结论：SC-58236可增强顺铂对A549细胞的细胞毒性,该作用与增加PTEN蛋白表达有关。     

细胞电穿孔联合低浓度顺铂作用卵巢癌SKOV3细胞体外生长实验研究

目的 探讨细胞电穿孔联合低浓度顺铂对卵巢癌SKOV3细胞株体外生长作用的影响.方法 选用电场600 V/cm,脉冲个数5个,电容11μF作用于SKOV3细胞株.根据作用不同分为电穿孔＋药物（E＋M）组;电穿孔（E）组,药物（M）组和空白（C）组.每3 d一次观察处理后的生长细胞共24 d.描绘细胞生长曲线,观察各组细胞生长变化.结果 不同方式处理后细胞生长情况表明电穿孔＋药物组对SKOV3细胞的体外生长有良好抑制作用,差异显著（P〈0.01）;单纯电穿孔组对肿瘤细胞的抑制大于单纯药物组,低于电穿孔＋药物组;单纯药物组的低浓度顺铂对卵巢癌SKOV3细胞仅有微弱生长抑制.结论 以电场600 V/cm,脉冲个数5个,电容11μF作为细胞电穿孔参数并同时联合低浓度顺铂作用卵巢癌SKOV3细胞株时,有明显加强非细胞抑制剂量顺铂对体外SKOV3细胞生长的抑制作用.