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目的:探讨微小核糖核酸21(miR-21)和程序性细胞死亡因子4(programmed cell death 4,PDCD4)在非小细胞肺癌(NSCLC)组织中的表达及临床意义。方法:应用Real-time PCR法检测61例NSCLC组织及61例对应癌旁肺组织中miR-21、PDCD4的表达,分析二者表达的相关性及其与临床病理特征和预后的关系。结果:同癌旁正常组织相比,NSCLC组织中miR-21 mRNA表达明显上调(88.52%,P=0.000),PDCD4 mRNA表达明显下调(83.61%,P=0.000)。两者表达呈负相关(r=0.044,P<0.05)。中晚期(Ⅲ-Ⅳ期)肺癌组织中miR-21 mRNA表达高于早期(Ⅰ-Ⅱ期)(P<0.05)。PDCD4 mRNA 表达与NSCLC的分化程度、临床分期及淋巴转移相关(P<0.05)。Kaplan-Meier 生存分析显示miR-21高表达患者较低表达患者总生存期明显缩短(P=0.007),相反,PDCD4高表达的患者较低表达患者具有较长的总生存期(P=0.003)。 相似文献
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目的 探讨程序性细胞死亡-4(PDCD4)对肝癌细胞生物学功能的影响机制及其在化疗敏感性中的作用.方法 应用qRT-PCR和Western Blot检测肝癌细胞HepG2、SMMC-7721、MHCC97H和正常的肝细胞L02中PDCD4的水平.采用肝癌细胞HepG2为研究对象,将转染PDCD4过表达载体(pDsRed2-N1-PDCD4)的HepG2细胞设置为PDCD4过表达组;将60μmol/L替莫唑胺作用24 h的HepG2细胞设置为替莫唑胺组;将正常肝癌细胞HepG2(不加替莫唑胺)设置为对照组;将转染pDsRed2-N1-PDCD4载体后经60μmol/L替莫唑胺作用24 h的HepG2细胞设置为联合组.采用噻唑蓝(MTT)法检测各组细胞的存活率,流式细胞仪检测细胞凋亡情况,West-ern Blot检测细胞中Bax、Bcl-2、MMP-9表达水平.结果 PDCD4在肝癌细胞HepG2、SMMC-7721、MHCC97H中的表达水平均低于正常的肝细胞L02(P<0.01),肝癌细胞HepG2中的PDCD4表达水平最低;PDCD4过表达组、替莫唑胺组、联合组的肝癌细胞存活率均明显低于对照组(P<0.01);PDCD4过表达组、替莫唑胺组、联合组的肝癌细胞凋亡率均明显高于对照组(P<0.01);PDCD4过表达组、替莫唑胺组、联合组肝癌细胞中Bax的表达水平均明显高于对照组(P<0.01);Bcl-2、MMP-9的表达水平均明显低于对照组(P<0.01);联合组肝癌细胞中Bax的表达水平明显高于PDCD4过表达组和替莫唑胺组(P<0.01).结论 PDCD4在肝癌细胞中低表达,PDCD4可抑制肝癌细胞的增殖,促进肝癌细胞的凋亡,增加肝癌细胞的化疗敏感性,其作用机制可能与Bax、Bcl-2、MMP-9有关. 相似文献
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目的 探讨异粘蛋白(MTDH)和程序性细胞死亡因子4(PDCD4)在乳腺癌组织中的表达水平,分析两者与乳腺癌临床病理特征的关系。方法 采用免疫组化SP法检测65例乳腺癌组织、30例癌旁正常乳腺组织及30例乳腺纤维腺瘤组织中MTDH、PDCD4的表达情况,收集乳腺癌患者的临床病历资料并比较两者不同表达的临床病理特征的差异。结果 乳腺癌组织中的MTDH阳性表达率为72.3%,高于癌旁正常乳腺组织(10.0%)和乳腺纤维腺瘤组织(20.0%);而PDCD4阳性表达率为41.5%,低于癌旁正常乳腺组织(93.3%)和乳腺纤维腺瘤组织(86.7%),以上差异均有统计学意义(P<0.05)。MTDH的表达与年龄、TNM分期和腋窝淋巴结转移有关(P<0.05),而与肿瘤大小和部位无关(P>0.05);PDCD4的表达与TNM分期和腋窝淋巴结转移有关(P<0.05),而与年龄、肿瘤大小和部位均无关(P>0.05)。MTDH表达与PDCD4表达间呈负相关(r=-0.595, P<0.05)。结论 乳腺癌组织中MTDH呈高表达而PDCD4呈低表达,两者表达均与TNM分期、腋窝淋巴结转移有关,提示两者在乳腺癌发生发展中有重要意义。 相似文献
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miR-21通过靶向PDCD4调控三阴性乳腺癌细胞的迁移和侵袭 总被引:1,自引:0,他引:1
目的: 研究miR-21在三阴性乳腺癌细胞MDA-MB-231中的表达,以及其是否通过调控PDCD4影响MDA-MB-231细胞的迁移和侵袭。方法: 采用实时定量PCR(qPCR)法检测MDA-MB-231细胞和正常乳腺细胞MCF-10A中miR-21和PDCD4 mRNA的表达。将MDA-MB-231细胞随机分为5组:空白对照组,转染miR-21模拟物组,模拟物对照组,转染miR-21抑制物组和抑制物对照组。采用Western blot法检测MDA-MB-231细胞PDCD4蛋白的表达;采用荧光素酶报告基因试剂盒检测转染不同载体后荧光强度的变化来判断miR-21的靶标;采用Transwell实验检测各组细胞的迁移和侵袭数目。结果: miR-21和PDCD4 mRNA在MDAMB-231细胞中的表达水平分别明显高于和低于MCF-10A细胞(P均 < 0.01)。过表达或抑制miR-21可调节PDCD4的表达水平。荧光素酶报告基因试剂盒检测结果显示miR-21可直接靶向调控PDCD4的表达。Transwell实验结果表明过表达miR-21表达能增强MDA-MB-231细胞的迁移和侵袭能力。结论: 在MDA-MB-231细胞中,miR-21通过靶向调控PDCD4表达影响细胞的迁移和侵袭。miR-21可能成为抑制三阴性乳腺癌迁移和侵袭的靶点。 相似文献
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背景与目的:微小RNA(microRNA,miRNA,miR)在肿瘤的发生、发展中具有重要的作用。miR-222在多种肿瘤组织中表达上调,而其在肾癌(renal cell carcinoma,RCC)中的表达及其作用机制尚不清楚。本研究拟通过检测RCC组织及相应癌旁组织中miR-222的表达情况,探讨miR-222在RCC中的作用。并在体外条件下,通过检测miR-222的下游作用靶点,探讨miR-222的抗RCC作用机制。方法:采用实时定量聚合酶链反应(quantitative real-time polymerase chain reaction,qRT-PCR)检测RCC组织和癌旁组织中miR-222的表达;采用CCK-8法检测细胞的增殖活力;采用蛋白[质]印迹法(Western blot)检测DDIT4蛋白及LC3-Ⅱ的表达;采用荧光素酶实验验证miR-222的作用靶点;转染EGFP-LC3后在激光共聚焦显微镜下观察细胞自噬状态。结果:qRTPCR检测结果显示,miR-222在RCC组织中表达明显上调。在人肾透明细胞癌786-O细胞株中敲低miR-222表达后显著抑制细胞的增殖活力,而过表达miR-222可增强786-O细胞的增殖活力(P<0.01)。在786-O细胞中敲低miR-222后,其靶基因DDIT4蛋白的表达显著上调,过表达miR-222后,DDIT4表达明显下调。荧光素酶实验结果表明,DDIT4为miR-222的直接作用靶点。RCC组织的DDIT4表达下调。在786-O细胞中抑制miR-222表达后,LC3-Ⅱ的表达水平显著上调,自噬体数目显著增加。结论:miR-222在RCC中高表达,并可能通过靶向抑制DDIT4的表达参与调控RCC细胞自噬。 相似文献
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目的: 研究miR-21在三阴性乳腺癌细胞MDA-MB-231中的表达,以及其是否通过调控PDCD4影响MDA-MB-231细胞的迁移和侵袭。方法: 采用实时定量PCR(qPCR)法检测MDA-MB-231细胞和正常乳腺细胞MCF-10A中miR-21和PDCD4 mRNA的表达。将MDA-MB-231细胞随机分为5组:空白对照组,转染miR-21模拟物组,模拟物对照组,转染miR-21抑制物组和抑制物对照组。采用Western blot法检测MDA-MB-231细胞PDCD4蛋白的表达;采用荧光素酶报告基因试剂盒检测转染不同载体后荧光强度的变化来判断miR-21的靶标;采用Transwell实验检测各组细胞的迁移和侵袭数目。结果: miR-21和PDCD4 mRNA在MDAMB-231细胞中的表达水平分别明显高于和低于MCF-10A细胞(P均 < 0.01)。过表达或抑制miR-21可调节PDCD4的表达水平。荧光素酶报告基因试剂盒检测结果显示miR-21可直接靶向调控PDCD4的表达。Transwell实验结果表明过表达miR-21表达能增强MDA-MB-231细胞的迁移和侵袭能力。结论: 在MDA-MB-231细胞中,miR-21通过靶向调控PDCD4表达影响细胞的迁移和侵袭。miR-21可能成为抑制三阴性乳腺癌迁移和侵袭的靶点。 相似文献
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摘 要:[目的] 检测miR-139在乳腺癌细胞系及组织中的表达,验证CXCR4是否为miR-139直接调控的靶基因,并探究miR-139是否可通过靶向抑制CXCR4/CXCL12生物轴从而抑制乳腺癌细胞的定向转移。[方法] 实时荧光定量聚合酶链式反应(qRT-PCR)用于检测miR-139在34对转移性乳腺癌患者的原发灶、转移灶及癌旁组织中,在5株乳腺癌细胞系及1株正常乳腺上皮细胞中的表达。将包含miR-139的重组慢病毒质粒及其阴性对照空载体质粒vector分别以病毒/细胞数量=20的比例感染MDA-MB-231细胞,经2.0μg/ml嘌呤霉素筛选,成功构建稳定表达miR-139或vector的MDA-MB-231细胞,将MDA-MB-231vector和MDA-MB-231miR-139细胞分别经尾静脉注射到BALB/c裸鼠中,构建乳腺癌裸鼠转移模型,观察过表达miR-139对裸鼠体内转移能力的影响。TargetScan软件用于预测miR-139的靶基因,根据预测结果,将野生型或突变型CXCR4的3’-UTR区域克隆到荧光素酶报告基因的下游(CXCR4-wt或CXCR4-mut)并分别与miR-139 mimics或scramble共转染后检测荧光素酶的活性。qRT-PCR和Western blot分别检测转染miR-139 mimics和scramble后CXCR4、CXCL12的mRNA和蛋白表达。[结果] miR-139在转移性乳腺癌原发灶和转移灶中的表达均低于癌旁组织,且转移灶中表达最低,miR-139在乳腺癌细胞系中的表达水平显著低于正常乳腺上皮细胞MCF-10A,且MDA-MB-231细胞中最低。尾静脉注射MDA-MB-231miR-139的裸鼠肺转移灶的个数均显著低于MDA-MB-231vector细胞。TargetScan软件预测CXCR4为miR-139直接调控的靶基因,CXCR4-wt+miR-139共转染组比CXCR4-wt+scramble共转染组的荧光素酶活性强度显著降低,CXCR4-mut+miR-139共转染组和CXCR4-wt+scramble共转染组间荧光素酶活性强度无显著性差异。转染miR-139后,CXCR4和CXCL12的mRNA和蛋白表达水平均显著下调,CXCR4/CXCL12生物轴下游的p-AKT和p-ERK蛋白表达水平也显著下调。[结论] miR-139可通过靶向调控CXCR4/CXCL12生物轴而抑制乳腺癌细胞MDA-MB-231定向转移。 相似文献
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目的 探讨过表达miR-218-5p和抑制TDP1的表达对鱼藤酮诱导损伤胃癌细胞凋亡的影响,阐明其可能的作用机制。方法 采用RT-PCR检测人正常胃黏膜上皮细胞和四种胃癌细胞中miR-218-5p及TDP1表达水平,并分析其相关性。双荧光素酶报告基因验证miR-218-5p对TDP1的靶向调控作用。采用1.0 μmol/L鱼藤酮诱导胃癌细胞损伤,流式细胞术检测细胞周期及凋亡率。Western blot检测细胞线粒体中TDP1水平及细胞Bax、Cyt-c蛋白的表达。结果 miR-218-5p在胃癌细胞中低表达(P<0.05),TDP1高表达(P<0.01),两者表达呈负相关(R2=0.9580, P=0.0212)。与对照组比较,损伤组SGC-7901细胞发生G1期阻滞,凋亡率升高(P<0.01)。与损伤组比较,miR-218-5pmimic组SGC-7901细胞G1期阻滞加剧,细胞凋亡率进一步升高(P<0.01),Bax及Cyt-c表达上调(P<0.01),而线粒体中TDP1蛋白水平降低(P<0.01);TDP1过表达组细胞G1期阻滞得到缓解,凋亡率降低(P<0.01),线粒体中TDP1蛋白水平升高(P<0.01),Bax及Cyt-c表达降低(P<0.01)。结论 miR-218-5p可靶向抑制TDP1表达,诱导胃癌细胞凋亡,其作用机制可能与抑制线粒体DNA损伤修复及功能维持、激活线粒体内源性凋亡途径有关。 相似文献
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四跨膜蛋白是一组具有四个高度疏水的跨膜结构域的低分子量细胞膜表面蛋白,可广泛参与细胞生长、粘附、迁移等多种生命活动。四跨膜蛋白超家族(TM4SF)可与包括四跨膜蛋白、整合素、生长因子及其受体、HLA家族、主要组织相容复合物(MHC)等在内的多种细胞表面分子相连接,形成以TM4SF为核心的四跨膜蛋白网络。四跨膜蛋白网络可通过直接或间接作用于细胞信号通道从而影响肿瘤细胞的粘附、分化、迁移及侵袭。目前研究表明四跨膜蛋白CD151、CD82、Tspan8及Tspan1与肝癌密切相关,可参与调控肝癌细胞的粘附、增殖、分化、迁移及侵袭等过程来影响肝癌的发生发展。KAI1/CD82为肝癌的抑制基因,上调其表达可以抑制肝癌细胞的迁移和侵袭;CD151在肝癌组织中大量表达,提示CD151或联合CD151/c-Met是可能预测肝癌的进展新指标,并且CD151可能用于肝癌的靶向治疗;而Tspan8(CO-029)及Tspan1(NET-1)则可用于预测肝癌的进展及预后。 相似文献
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目的探讨miRNA21/PDCD4环路在卵巢肿瘤中的作用及其临床意义。方法采用qRT-PCR和Western blot方法检测miRNA21和PDCD4在108例卵巢癌患者、67例交界性病变、75例良性病变和35例正常组织中的表达情况。结果miRNA21在卵巢癌组织中的表达水平是正常卵巢组织的 12.3 倍(P<0.01);在交界性病变组织中的表达水平是正常卵巢组织的 7.8 倍 (P<0.01);在良性病变组织中的表达水平是正常卵巢组织的 3.6 倍 (P<0.05)。PDCD4蛋白含量在卵巢癌组织中的表达明显低于交界性病变组织,交界性病变组织低于良性病变组织,良性病变组织低于正常卵巢组织,两两相比差异均具有统计学意义(P<0.05),正常卵巢组织与卵巢癌和交界性病变组织中PDCD4蛋白含量相比差异有统计学意义(P<0.01)。结论miRNA21/PDCD4环路异常在卵巢癌发生中具有重要的作用。 相似文献
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Socio-economic Status Plays Important Role in Childhood Cancer Treatment Outcome in Indonesia 下载免费PDF全文
《Asian Pacific journal of cancer prevention》2012,13(12):6491-6496
Background: The influence of parental socio-economic status on childhood cancer treatment outcome inlow-income countries has not been sufficiently investigated. Our study examined this influence and exploredparental experiences during cancer treatment of their children in an Indonesian academic hospital. Materialsand Methods: Medical charts of 145 children diagnosed with cancer between 1999 and 2009 were reviewedretrospectively. From October 2011 until January 2012, 40 caretakers were interviewed using semi-structuredquestionnaires. Results: Of all patients, 48% abandoned treatment, 34% experienced death, 9% had progressive/relapsed disease, and 9% overall event-free survival. Prosperous patients had better treatment outcome than poorpatients (P<0.0001). Odds-ratio for treatment abandonment was 3.3 (95%CI: 1.4-8.1, p=0.006) for poor versusprosperous patients. Parents often believed that their child’s health was beyond doctor control and determinedby luck, fate or God (55%). Causes of cancer were thought to be destiny (35%) or God’s punishment (23%).Alternative treatment could (18%) or might (50%) cure cancer. Most parents (95%) would like more informationabout cancer and treatment. More contact with doctors was desired (98%). Income decreased during treatment(55%). Parents lost employment (48% fathers, 10% mothers), most of whom stated this loss was caused by theirchild’s cancer (84% fathers, 100% mothers). Loss of income led to financial difficulties (63%) and debts (55%).Conclusions: Treatment abandonment was most important reason for treatment failure. Treatment outcome wasdetermined by parental socio-economic status. Childhood cancer survival could improve if financial constraintsand provision of information and guidance are better addressed. 相似文献
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PDCD4 as a Predictor of Sensitivity to Neoadjuvant Chemoradiotherapy in Locally Advanced Rectal Cancer Patients 下载免费PDF全文
《Asian Pacific journal of cancer prevention》2014,15(2):825-830
Objective: The purpose of this study was to examine the role of programmed cell death 4 (PDCD4) expressionin predicting tumor response to neoadjuvant chemoradiotherapy and outcomes for patients with locally advancedrectal cancer. Methods: Clinicopathological factors and expression of PDCD4 were evaluated in 92 patientswith LARC treated with nCRT. After the completion of therapy, 4 cases achieved clinical complete response(cCR), and thus the remaining 88 patients underwent a standardized total mesorectal excision procedure.There were 38 patients (41.3%) with a good response (TRG 3-4) and 54 (58.7%) with a poor one (TRG 0-2).Results: Immunohistochemical staining analyses showed that patients with high expression of PDCD4 were moresensitive to nCRT than those with low PDCD4 expression (P=0.02). High PDCD4 expression before nCRT andgood response (TRG3-4) were significantly associated with improved 5-year disease-free survival and 5-yearoverall survival (P<0.05). Multivariate analysis demonstrated that the pretreatment PDCD4 expression was anindependent prognostic factor. Conclusion: Our study demonstrated that high expression of PDCD4 protein isa useful predictive factor for good tumor response to nCRT and good outcomes in patients with LARC. 相似文献
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Glutathione S-Transferase P1 Variant Plays a Major Contribution to Decreased Susceptibility to Liver Cancer in Thais 下载免费PDF全文
《Asian Pacific journal of cancer prevention》2009,10(5):783-788
Glutathione S-transferases (GSTs) play important roles in carcinogenic biotransformation processes, whichvary among individuals. Polymorphisms of the encoding genes are associated with alteration of detoxificationcapacity, resulting in a variable risk of cancer development. The present study was performed to determine theeffects of polymorphisms in GST (M1, P1, and T1) genes on susceptibility to liver cancer in Thais. We recruited140 hepatocellular carcinoma (HCC) and cholangiocarcinoma (CCA) patients and 280 healthy volunteers forour unmatched case-control based association study. GSTM1 deletion and heterozygous deletion were determinedand discriminated by semi-quantitative denaturing high performance liquid chromatography (DHPLC). Apolymerase chain reaction - restriction fragment length polymorphisms (PCR-RFLPs) approach was utilized todetect the GSTP1 Ile105Val variant, while the GSTT1 null allele was detected by multiplex PCR. With resultsfor single locus associations, only GSTP1 Ile/Val showed a significant decrease in the risk of liver cancer (OR=0.58;95% CI: 0.36-0.90; p-value=0.016). GSTP1 (Ile/Val) interacted with the GSTT1 wild type to further decreasesusceptibility to liver cancer (OR=0.41; 95% CI: 0.18-0.93; p-value=0.029). Moreover, three locus interactionsof GSTP1 (Ile/Val or Val/Val) with either wild type or null alleles of both GSTM1 and GSTT1 decreased risk ofliver cancer. In conclusion the GSTP1 null genotype apparently causes decreased risk of liver cancer in Thais.The findings point to GSTP1 Ile105Val as a possible protective allele against liver cancer risk. 相似文献
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目的:探讨SOX4与食管癌顺铂耐药的关系及其耐药机制。方法:采用递增药物浓度、间歇冲击作用的方法构建顺铂食管癌耐药细胞株KYSE30/DDP;流式细胞仪检测KYSE30及KYSE30/DDP细胞凋亡情况;Western blot检测SOX4及凋亡相关指标在KYSE30及KYSE30/DDP细胞中的变化;CCK8检测干扰SOX4对KYSE30和KYSE30/DDP细胞顺铂敏感度的影响;流式细胞仪及Western blot检测干扰SOX4对KYSE30/DDP细胞凋亡及相关指标的影响。结果:成功构建了生长状态良好的KYSE30/DDP细胞株,其耐药指数为4.1;KYSE30/DDP细胞凋亡较其亲本细胞KYSE30明显降低(t=-8.414,P<0.05);Western blot结果显示,SOX4在顺铂耐药细胞KYSE30/DDP中的表达高于其亲本细胞KYSE30,KYSE30/DDP细胞中凋亡相关指标Cleaved caspase 3及Cleaved PARP表达低于KYSE30;在KYSE30/DDP细胞中干扰SOX4,其对顺铂的敏感性及凋亡细胞增加(F=625.423,P<0.05),凋亡相关指标Cleaved caspase 3及Cleaved PARP表达增加。结论:SOX4在食管癌顺铂耐药细胞KYSE30/DDP中高表达,并可通过抑制凋亡介导食管癌顺铂耐药。 相似文献