水蛭素联合阿霉素对人卵巢癌细胞株耐药性的实验观察

目的探讨水蛭素联合阿霉素对人卵巢癌细胞生长的影响。方法通过细胞培养后绘制生长曲线,了解联合用药对抑制癌细胞增殖及诱导凋亡的作用。结果水蛭素联合阿霉素具有杀伤人卵巢癌细胞的效果。结论水蛭素有可能作为临床抗癌和抑癌治疗的潜在辅助用药。     

KDM2A对人卵巢癌顺铂耐药细胞株A2780增殖和凋亡的影响及机制研究

目的:探讨赖氨酸脱甲基酶2A(Lysine-specific demethylase 2A,KDM2A)对顺铂(cisplatin,DDP)耐药的人卵巢癌细胞A2780细胞增殖和凋亡的影响及其可能作用机制。方法:通过构建慢病毒载体转染A2780/DDP,分为A2780、A2780/DDP、A2780/DDP/KDM2A(转染KDM2A)、A2780/DDP/Jagged1(转染Jagged1)以及A2780/DDP/NC(转染病毒载体)组。采用Western blot检测3组KDM2A、Jagged1、Bcl2和BAX蛋白表达,CCK8和平板克隆形成实验检测细胞对顺铂的敏感性,流式细胞术检测细胞凋亡情况。结果:A2780/DDP细胞KDM2A和Jagged1的蛋白表达水平均显著高于A2780细胞(P0.05),且A2780/DDP/KDM2A细胞中KDM2A和Jagged1的蛋白表达均低于A2780/DDP以及阴性对照组A2780/DDP/NC(P0.05);A2780/DDP/Jagged1细胞的Jagged1蛋白表达低于A2780/DDP以及A2780/DDP/NC(P0.05),而其KDM2A蛋白的表达比较差异无统计学意义(P0.05)。不同浓度DDP处理的A2780/DDP/KDM2A细胞的生长抑制率均显著高于A2780/DDP/NC和A2780/DDP细胞(P0.05),A2780/DDP/KDM2A细胞克隆形成数量亦明显高于A2780/DDP/NC和A2780/DDP细胞(P0.05)。A2780/DDP/KDM2A细胞凋亡率为(25.84±3.27)%,明显高于A2780/DDP细胞[(14.29±1.96)%](P0.05)和A2780/DDP/NC细胞[(12.46±2.15)%](P0.05)。A2780/DDP/KDM2A细胞中Bcl-2蛋白表达明显低于A2780/DDP细胞(P0.05),而A2780/DDP/KDM2A细胞Bax的表达水平却高于A2780/DDP细胞(P0.05)。结论:KDM2A可能通过上调Jagged1的表达,促进人卵巢癌细胞A2780的增殖并抑制其凋亡,进而降低人卵巢癌耐药细胞A2780的顺铂敏感性。     

p150Sa12在人卵巢癌细胞株中促进MX1基因的表达

目的：研究p150Sa12在人卵巢癌细胞株中对MX1基因表达的影响。方法：将MX1基因的启动子克隆至带有Luciferase报告基因的pGL3-basic载体中,将其与p150Sa12表达载体用PEI介导的转染方法共转染至卵巢癌细胞株SKOV3,用双荧光素酶检测系统检测MX1启动子活性变化;将p150Sa12表达载体转染至卵巢癌细胞株ES-2,用western blot检测细胞中MX1基因的表达变化。结果：双荧光素酶检测系统检测MX1启动子活性被p150Sa12上调,westemblot检测转染p150Sa12后细胞中MX1表达量增加。结论：D150Sa12在人卵巢癌细胞株申促进MX1基因的表达。     

褪黑素联合顺铂对A549细胞凋亡相关基因的影响

观察褪黑素以及褪黑素联合顺铂是否可以抑制A549细胞增殖并促进细胞凋亡,探讨ERK1/2MAPK信号通路在这一过程中的作用,为肺腺癌的研究提供实验依据。用不同浓度的褪黑素、不同浓度的顺铂、褪黑素联合顺铂刺激体外培养的肺腺癌细胞系A549细胞,MTT法检测各组细胞的活性,运用Real-time RT-PCR检测凋亡相关基因Bcl-2、Bax、p53的表达水平,Western-blot检测ERK1/2MAPK的活性变化。结果:1)单纯使用褪黑素和顺铂均可抑制A549细胞增殖,褪黑素联合顺铂时,抑制作用更加显著,一定浓度的褪黑素可降低顺铂的使用浓度;2)未经处理的A549细胞Bcl-2/Bax很高,p53基因表达较低,经褪黑素以及褪黑素联合顺铂刺激后A549细胞中Bcl-2/Bax明显下降,p53基因表达明显升高,并有浓度依赖;3)经褪黑素和顺铂刺激后A549细胞中磷酸化ERK1/2MAPK水平明显降低。褪黑素联合顺铂可抑制A549细胞增殖并且诱导凋亡相关基因表达,褪黑素和顺铂对A549细胞的抑制作用可能与ERK1/2MAPK信号通路有关。     

MiR-130a and MiR-374a Function as Novel Regulators of Cisplatin Resistance in Human Ovarian Cancer A2780 Cells

Chemoresistance remains a major obstacle to effective treatment in patients with ovarian cancer, and recently increasing evidences suggest that miRNAs are involved in drug-resistance. In this study, we investigated the role of miRNAs in regulating cisplatin resistance in ovarian cancer cell line and analyzed their possible mechanisms. We profiled miRNAs differentially expressed in cisplatin-resistant human ovarian cancer cell line A2780/DDP compared with parental A2780 cells using microarray. Four abnormally expressed miRNAs were selected (miR-146a,-130a, -374a and miR-182) for further studies. Their expression were verified by qRT-PCR. MiRNA mimics or inhibitor were transfected into A2780 and A2780/DDP cells and then drug sensitivity was analyzed by MTS array. RT-PCR and Western blot were carried out to examine the alteration of MDR1, PTEN gene expression. A total of 32 miRNAs were found to be differentially expressed in A2780/DDP cells. Among them, miR-146a was down-regulated and miR-130a,-374a,-182 were upregulated in A2780/DDP cells, which was verified by RT-PCR. MiR-130a and miR-374a mimics decreased the sensitivity of A2780 cells to cisplatin, reversely, their inhibitors could resensitize A2780/DDP cells. Furthermore, overexpression of miR-130a could increase the MDR1 mRNA and P-gp levels in A2780 and A2780/DDP cells, whereas knockdown of miR-130a could inhibit MDR1 gene expression and upregulate the PTEN protein expression .In a conclusion, the deregulation of miR-374a and miR-130a may be involved in the development and regulation of cisplatin resistance in ovarian cancer cells. This role of miR-130a may be achieved by regulating the MDR1 and PTEN gene expression.     

米非司酮对胰腺癌细胞耐药株Patu8988/FU 的逆转作用

目的:研究米非司酮(mifepristone,MIF)对胰腺癌多药耐药细胞株Patu8988/FU耐药性的逆转作用。方法:采用四甲基偶氮唑盐(MTT)比色法检测MIF对胰腺癌细胞Patu8988及胰腺癌耐药细胞株Patu8988/FU增殖的影响,选择对两种细胞生长抑制率≤5%的浓度为其非细胞毒性剂量;观察非毒性剂量的MIF作用72 h后Patu8988/FU细胞对5-FU耐药性的逆转效果。结果:①MIF浓度≤10μmol.L-1对Patu8988及Patu8988/FU于细胞的增殖均无抑制作用(P>0.05);20μmol.L-1和40μmol.L-1MIF对Patu8988及Patu8988/FU于细胞的增殖均有抑制作用(P<0.05),MIF对Patu8988及Patu8988/FU细胞增殖具有剂量依赖性;②加入梯度浓度5-FU后Patu8988细胞和Patu8988/FU细胞的IC50分别为(2.394±0.011)μg.ml-1、(49.87±4.026)μg.ml-1(P<0.01),耐药倍数为20.83;Patu8988及Patu8988/FU细胞加入5-FU后分别与2.5μmol.L-1、5μmol.L-1、10μmol.L-1MIF共同孵育72h后,Patu8988/FU细胞对5-FU耐药性的逆转倍数分别为1.42、1.71、3.10;Patu8988/FU对5-FU的敏感性明显增加(P<0.05),而Patu8988细胞对5-FU的敏感性并未改变(P>0.05)。结果还显示MIF作用后Patu8988/FU对5-FU的敏感性变化具有剂量依赖性。结论:MIF对胰腺癌多药耐药细胞株Patu8988/FU耐药性的有逆转作用。     

siRNA抑制S100A4 表达对卵巢癌细胞CP70生物学特性的影响

摘要 目的：探讨人卵巢癌顺铂耐药细胞株CP70沉默S100A4 基因后,CP70细胞对顺铂敏感性、凋亡及细胞迁移的影响。方法：设计并合成S100A4基因特异性的siRNA并转染入卵巢癌细胞CP70,48 h后应用RT-PCR和Western Blot检测在mRNA和蛋白水平siRNA对S100A4的影响,MTT法检测转染 siRNA后卵巢癌细胞CP70对顺铂敏感性的变化。;用流式细胞术检测顺铂（40 μM） 对转染S100A4 siRNA后对卵巢癌细胞CP70凋亡的影响,Transwell法观察siRNA抑制S100A4后对卵巢癌CP70迁移能力的影响。 结果：与空白对照组、阴性对照组相比,S100A4 siRNA转染组CP70细胞的S100A4基因和蛋白表达降低(P<0.01)。MTT法检测顺铂敏感性发现S100A4 siRNA转染组CP70细胞顺铂敏感性增强。在顺铂刺激下,siRNA转染组细胞凋亡率高于其他各组,差异具有统计学意义（P<0.05）。Transwell发现CP70细胞迁移能力明显下降（P<0.05）。结论：S100A4 siRNA能够明显抑制CP70细胞S100A4的表达,从而增强细胞对顺铂的敏感性,促进细胞凋亡,减弱细胞的迁移能力。S100A4有望成为逆转卵巢癌铂类耐药的治疗靶点。     

siRNA抑制S100A4表达对卵巢癌细胞CP70生物学特性的影响

目的：探讨人卵巢癌顺铂耐药细胞株CP70沉默S100A4基因后,CP70细胞对顺铂敏感性、凋亡及细胞迁移的影响。方法：设计并合成S100A4基因特异性的siRNA并转染入卵巢癌细胞CP70,48 h后应用RT-PCR和Western Blot检测在mRNA和蛋白水平siRNA对S100A4的影响,MTT法检测转染siRNA后卵巢癌细胞CP70对顺铂敏感性的变化。用流式细胞术检测顺铂（40μM）对转染S100A4 siRNA后对卵巢癌细胞CP70凋亡的影响,Transwell法观察siRNA抑制S100A4后对卵巢癌CP70迁移能力的影响。结果：与空白对照组、阴性对照组相比,S100A4siRNA转染组CP70细胞的S100A4基因和蛋白表达降低（P〈0.01）。MTT法检测顺铂敏感性发现S100A4 siRNA转染组CP70细胞顺铂敏感性增强。在顺铂刺激下,siRNA转染组细胞凋亡率高于其他各组,差异具有统计学意义（P〈0.05）。Transwell发现CP70细胞迁移能力明显下降（P〈0.05）。结论：S100A4 siRNA能够明显抑制CP70细胞S100A4的表达,从而增强细胞对顺铂的敏感性,促进细胞凋亡,减弱细胞的迁移能力。S100A4有望成为逆转卵巢癌铂类耐药的治疗靶点。     

MicroRNAs Contribute to the Anticancer Effect of 1'-Acetoxychavicol Acetate in Human Head and Neck Squamous Cell Carcinoma Cell Line HN4

1'-Acetoxychavicol acetate (ACA), extracted from rhizomes of tropical ginger, possesses antitumor properties against a wide variety of malignancies. MicroRNAs have been found to act as oncogenes and as tumor suppressor genes in the development of cancer. The purpose of this study was to investigate the miRNA involved in the molecular mechanisms of ACA action on tumor inhibition. It was found that ACA significantly inhibited the growth of human head and neck squamous cell carcinoma cell line HN4 and induced cell apoptosis. Further studies indicated that ACA downregulated the expression of miR-23a in HN4 cells. Transfection with anti-miR-23a inhibited the proliferation of HN4 cells and induced cell apoptosis. In addition, phosphatase and tensin homolog deleted on chromosome 10 (PTEN) was confirmed to be the target of miR-23a. Taken together, our findings suggest that ACA might have anticancer effects against human head and neck cancer through downregulation of miR-23a, which can repress tumor suppressor PTEN.     

高表达精脒/精胺N1-乙酞基转移酶对人肺癌A549细胞株生长的影响

旨在研究人精脒/精胺N1-乙酰基转移酶(spermidine/spermine N1-acetyltransferase,SSAT)高表达对人肺癌A549细胞生长的影响。以pCR2.1-SSAT质粒为模板,PCR法扩增人SSAT基因并克隆至pcDNA3.1表达载体。重组质粒转染A549细胞后,RT-PCR法和Western blotting法筛选SSAT高表达的细胞株。MTT法检测细胞增殖,流式细胞仪检测细胞周期。成功构建pcDNA3.1-SSAT重组质粒,用该质粒转染A549细胞后,筛选获得稳定高表达SSAT的细胞株。SSAT高表达导致细胞生长抑制,S期细胞减少和自发性凋亡细胞增多。结果显示,稳定高表达SSAT可在A549肺癌细胞中部分模拟多胺类似物类抗癌药物的药理活性,导致瘤细胞生长抑制和细胞凋亡。