共查询到15条相似文献,搜索用时 234 毫秒
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目的:探讨β-catenin表达下调对Tca8113细胞增殖、周期、凋亡和迁移的影响。方法:用脂质体2000将β-catenin siRNA转染舌鳞状细胞癌Tca8113细胞,Western blotting技术检测转染后Tca8113细胞中β-catenin蛋白的表达,CCK-8试剂分析转染后对细胞增殖能力的影响;流式细胞术检测下调β-catenin表达对Tca8113细胞周期及细胞凋亡的影响;Boyden chamber实验分析β-catenin表达下调对Tca8113细胞迁移能力的影响。结果:β-catenin siRNA能明显下调Tca8113细胞中β-catenin蛋白的表达,显著抑制Tca8113细胞的增殖。β-catenin siRNA组中的G0/G1期的细胞百分比明显高于未处理组和对照siRNA组。此外,β-catenin siRNA组中细胞凋亡的比率明显高于未处理组和对照siRNA组,其凋亡变化与caspase-3和bax蛋白表达的上调和bcl-2表达的下降密切相关。与未处理组和对照siRNA组相比,β-catenin siRNA组中Tca8113细胞的迁移能力显著下降,组间具有统计学意义。结论:β-catenin在舌鳞状细胞癌的发生发展中可能具有重要的作用。 相似文献
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目的 应用RNA干扰技术抑制人舌鳞状细胞癌细胞株Tca8113中双泛素(diubiquitin)的表达,探讨双泛素表达下调对舌鳞状细胞癌细胞生物学行为的影响.方法 构建针对双泛素特异性小干扰RNA( small interfering RNA,siRNA)真核表达载体pU-双泛素-siRNA,将其转染至Tca8113细胞,采用反转录聚合酶链反应(RT-PCR)、蛋白质印迹法检测转染后的Tca8113细胞中双泛素的表达.通过流式细胞仪分析siRNA对舌鳞状细胞癌细胞周期的影响,并通过细胞侵袭能力实验观察siRNA对Tca8113细胞恶性生物学行为的变化.结果 siRNA干扰Tca8113细胞后,双泛素的表达无论是在mRNA水平还是在蛋白质水平均显著下降[mRNA:实验组(0.36±0.03)、空白对照组(0.92±0.07)、空载体组(0.95±0.05);蛋白:实验组(0.39±0.04)、空白对照组(0.64±0.05)、空载体组(0.69±0.05)](P<0.05),细胞周期被阻滞在G1期,细胞生长缓慢,体外侵袭能力下降(P<0.05).结论 通过RNAi技术阻断双泛素的表达,可抑制Tca8113细胞的生长、增殖、侵袭,提示双泛素在舌鳞状细胞癌的发生、发展过程中起重要作用. 相似文献
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目的 研究短发夹RNA(short hairpin RNA,shRNA)干扰血管内皮生长因子(vascular endothelial growth factor,VEGF)的表达对人舌癌耐药细胞Tca-顺铂(Cisplatin,DDP)移植瘤的影响及可能机制.方法 以人舌癌Tca8113细胞系为亲本诱导建立耐药Tca-DDP细胞系,将其接种于裸鼠背侧皮下,建立移植瘤模型.模型动物分为4组,即空白对照组(非转染)、空载体组(转染空质粒载体)、无关片段组(转染无关对照质粒)、干扰质粒组(转染靶向VEGF的shRNA表达载体),每组6只,每3天以脂质体为载体作瘤体内及瘤周多点注射.观测移植瘤生长曲线,转染l0次后取瘤体称重,免疫组化法检测移植瘤微血管密度,原位杂交法检测移植瘤VEGFmRNA,免疫组化技术检测移植瘤VEGF、多药耐药蛋白P糖蛋白(P-glycoprotein,P-gp)、B细胞淋巴瘤-白血病因子2(B cell lymphoma/leukemia-2,bcl-2)及胞外信号调节激酶2蛋白(extracellular signal-regulated kinase 2,ERK-2).结果 干扰质粒组的瘤体生长明显受到抑制(P<0.05),移植瘤重量(0.4781±0.0860)g及微血管密度(7.35±1.31)个/视野,低于其他3组(P<0.05),且VEGF的mRNA及蛋白、P-gp、bcl-2及ERK-2的相对表达量分别为(0.0767±0.0234)、(0.1301±0.0433)、(0.1517±0.0184)、(0.1218±0.0251)及(0.1178±0.0291),表达均显著减少(P<0.05).结论 RNA干扰抑制VEGF的表达,可抑制人舌癌Tca8113耐药细胞移植瘤的生长及血管生成,下调P-gp、bcl-2及ERK-2表达水平,提示靶向抑制VEGF可能是治疗耐药舌癌途径之一.Abstract: Objective To study the in vivo interference effects of vascular endothelial growth factor (VEGF) short hairpin RNA (shRNA) on xenografts of drug-resistant tongue cancer cells. Methods Drugresistant tongue caner cells Tca/Cisplatin(DDP) were injected subcutaneously into nude mice to establish xenograft models, which were randomly divided into non-transfected group, mock control group, control group transfected with scrambled sequence plasmid, interference group transfected with VEGF-shRNA expression plasmid. Liposome-mediated plasmid transfection was done in the latter three groups every three days. Xenografts were observed and tumor growth curve was measured. After the 10th transfection, tumors were anatomized and weigh. Microvessel density was detected by immunohistochemical staining. In situhybridization assay was used to test VEGF mRNA, and immunohistochemistry to test VEGF, P-glycoprotein ( P-gp), B cell lymphoma/leukemia-2 ( bcl-2 ) and extracellular signal-regultaed kinase 2 (ERK-2) protein. Results Tumor growth in VEGF-shRNA interference group was significantly slow. Tumor weight was (0.4781 ±0.0860) g, microvessel density (7.35 ± 1.31)/view, VEGF mRNA(0.0767 ±0.0234), VEGF protein (0.1301 ± 0.0433 ), P-gp (0.1517 ± 0.0184 ), bcl-2 ( 0.1218 ± 0.0251 ) and ERK-2 protein (0.1178 ±0.0291 ) in VEGF-shRNA interference group; all of them were less than those in the other three groups( P < 0.05 ). Conclusions Inhibition targeting VEGF may become a potential therapy for drugresistant tongue cancer. 相似文献
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核因子-κB/p65 siRNA介导的舌鳞状细胞癌Tca8113细胞凋亡及相关分子机制 总被引:1,自引:1,他引:0
目的:研究下调核因子κB(nuclear factor-kappa B,NF-κB)/p65基因的表达对舌鳞状细胞癌Tca8113细胞凋亡的影响,并探讨Tca8113细胞凋亡可能的分子机制。方法:利用脂质体2000将终浓度为100nmol/L的p65 siRNA转染舌鳞状细胞癌Tca8113细胞,通过RT-PCR检测0、24、48和72hp65 mRNA的表达,并通过流式细胞术检测转染前后细胞凋亡变化,通过Caspase-Glo○R-3/7,-8和-9检测试剂盒分析caspase-3/9活性,用Western blotting技术检测p65、bcl-2和bax蛋白表达。结果:Tca8113细胞转染p65siRNA后,在48hp65 mRNA的相对表达量为0.181±0.028,显著低于未处理组0.595±0.038和对照siRNA组0.613±0.067(P〈0.05)。流式细胞术结果显示,p65 siRNA能促使Tca8113细胞凋亡,其早期凋亡比率为(23.16±1.72)%,显著高于未处理组和对照siRNA组(P〈0.01)。转染48h后,p65和bcl-2蛋白的相对表达水平明显下调,而促凋亡蛋白bax的表达显著上升,并伴随着caspase-3/9活性的显著上升。结论:NF-κB信号途径中的p65亚基可能在舌鳞状细胞癌凋亡中发挥重要作用,该研究有望为舌鳞状细胞癌的分子靶向治疗提供理论依据。 相似文献
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乏氧对人舌鳞癌细胞系Tca8113体外黏附和侵袭能力的影响 总被引:2,自引:1,他引:1
目的:研究乏氧及人乏氧诱导因子-1α(HIF-1α)基因表达对舌鳞癌Tca8113细胞系黏附和侵袭能力的影响.方法:将化学合成的siRNA_(HIF-1α)转染入Tca8113细胞后进行常氧或乏氧(1% O_2)培养.实验设以下对照组:空白对照组、脂质体组及非特异性siRNA(siRNA_(Irr))组.采用real time-PCR和Western blot法测定细胞中HIF-1α mRNA表达和蛋白含量,并分别检测HIF-1α基因干扰前后细胞对细胞外基质(ECM)的黏附与侵袭力.结果: 乏氧能够诱导Tca8113细胞的黏附与侵袭力增加.乏氧培养条件下,HIF-1α的表达上调主要发生在蛋白水平.siRNA_(HIF-1α)转染后常氧或乏氧培养24 h, HIF-1α mRNA表达显著下调,与各对照组相比有统计学意义(P<0.01),Tca8113细胞内HIF-1α蛋白含量亦显著降低.无论在常氧还是乏氧培养条件下,siRNA_(HIF-1α)转染的Tca8113细胞黏附力与各对照组相比均显著降低(P<0.05或P<0.01);侵袭力也显著降低(P<0.01).乏氧条件下siRNAHIF-1α转染的Tca8113细胞黏附力和侵袭力下降程度高于常氧培养[(36.4±2.7)% vs (26±2.35);(44.2±2.2)% vs (35±1.75), P<0.01)].结论: 化学合成的靶向HIF-1α的siRNA能够下调Tca8113细胞中HIF-1α基因的表达,降低细胞对ECM的黏附和侵袭力,可能成为抑制肿瘤转移的基因治疗的新途径或新靶点. 相似文献
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目的 探讨视网膜母细胞瘤结合蛋白2(retinoblastoma binding protein 2,RBP-2)在人脂肪基质细胞(human adipose-derived stromal cell,hASC)成骨向分化中的作用.方法 设计靶向RBP-2小干扰RNA(small interfering RNA,siRNA)序列4对,将相应寡核苷酸构建到慢病毒载体pLL 3.7中,于293T细胞进行病毒包装用于RBP-2基因敲低.采用RBP-2敲低效果好的两个siRNA序列进行病毒包装,并以非沉默siRNA的pLL 3.7质粒包装的慢病毒为对照组,感染hASC,培养第14天定量检测碱性磷酸酶(alkaline phosphatase,ALP)活性并行ALP染色及茜素红矿化结节染色,检测hASC成骨向分化的差异.结果 成功构建RBP-2基因RNA干扰慢病毒载体并获得相应慢病毒.慢病毒感染hASC后,RBP-2 mRNA及蛋白表达均被明显抑制.RBP-2 siRNA-1组和RBP-2 siRNA-4组的敲低效果较好,以此两组感染hASC.成骨诱导培养第14天RBP-2 siRNA-1组和RBP-2 siRNA-4组ALP活性[(299.2±22.7)、(224.3±17.7)U/g]高于对照组[(129.9±12.9)U/g,P<0.05],RBP-2 siRNA-1组和RBP-2 siRNA-4组茜素红及ALP染色强于对照组.结论 成功构建的RBP-2 RNA干扰慢病毒能显著抑制RBP-2表达,并促进hASC向成骨细胞分化,即RBP-2可以抑制hASC的成骨向分化.Abstract: Objective To explore the effect of retinoblastoma binding protein 2 (RBP-2), a histone H3K4 demethylase, on osteogenic differentiation of human adipose-derived stromal cell(hASC).Methods According to the GenBank sequence information of RBP-2, four different small interfering RNAs (siRNA) targeting RBP-2 gene were designed and the corresponding short hairpin RNAs (shRNA) were cloned into pLL 3.7 lentivirus RNA interference vector. The lentivirus with RBP-2-siRNA was packaged in 293T cells. The effective sequence was examined and selected by Western blotting and real-time PCR. The lentiviruses with efficient knockdown effects were used to infect hASC. On the 14th day after osteogenic differentiation, alkaline phosphatase (ALP) activities of hASC were quantitatively tested and at the same time, ALP staining and alizarin red staining were performed to assess the difference of osteogenic differentiation between the knockdown group and the control group. Results The recombinant lentivirus siRNA targeting RBP-2 was successfully constructed and the expression of RBP-2 mRNA and protein were dramatically suppressed by infection with RBP-2-siRNA lentivirus. On the 14th day after osteogenic induction, ALP activity of hASC in the knockdown group[(299.2 ±22.7), (224.3± 17.7) U/g]was much stronger than that in the control group[( 129.9 ± 12.9) U/g, P < 0. 05]and the same result was achieved for the ALP staining and alizarin red staining. Conclusions The constructed RBP-2-siRNA lentivirus could markedly decrease the expression of RBP-2 and promote osteogenic differentiation of hASC.It indicated that RBP-2 can repress the osteogenic differentiation of hASC. 相似文献
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目的 构建孕鼠慢性牙周炎(chronic periodontitis,CP)模型,探讨肿瘤坏死因子(TNF)在CP孕鼠早产胎盘组织中的表达.方法 选取60 d龄Wistar雌鼠20只按随机数字表分为两组:正常对照组8只、CP组12只,CP组建立牙周炎模型,4周后两组雌鼠均与雄鼠合笼,观察两组孕鼠的分娩时间及新生鼠出生体质量,至孕19 d(大鼠足孕期为21~23 d,早于孕19 d即为早产)处死全部孕鼠取胎盘组织.观察孕鼠牙周组织的病理改变;实时荧光定量聚合酶链反应(PCR)法分析胎盘组织中TNF的表达.结果 实验牙的牙周检查及组织病理学观察结果 显示,已成功建立了孕鼠CP动物模型.CP组共有7只孕鼠提前分娩,活产仔鼠30只;正常对照组至孕19 d处死时,活产仔鼠56只.CP组早产孕鼠每胎平均活产仔鼠数[(4.1±2.2)只]显著低于正常对照组[(9.2±2.2)只],CP组仔鼠出生体质量[(5.01±0.43)g]也显著低于正常对照组[(5.79±0.53)g],P<0.05.TNF基因在CP组和正常对照组的相对定量表达值分别为(1.807±0.265)、(1.003±0.021),差异有统计学意义(P=0.001).结论 TNF在慢性牙周炎孕鼠胎盘组织中呈过表达,它与孕鼠的早产及仔鼠出生体质量低有一定关系.Abstract: Objective To examine the expression of tumor necrosis factor in placenta of pregnant rats with chronic periodontitis.Methods Twenty Wistar female rats were randomly divided into two groups,control(n=8)and experimentalgroup(n=12).The periodontitis model was established in the experimental group.The females and males in the two groups got together four weeks later.Nineteen days after pregnancy all rats were executed and placenta collected.The delivery time and neonatal birth weight were recorded and the pathological changes of periodontal tissue observed.Tumor necrosis factor(TNF)expression was examined in placenta by real-time quantitative polymerase chain reaction analysis.Results The animal model of chronic periodontitis was successfully established.Experimental group delivered 30 offspring and the control group 56 offspring.The average number of pups born alive per liner in experimental group(4.1±2.2)Was significantly lower than that in control group(9.2±2.2),P<0.05.The birth weight of pups in experimental group[(5.01±0.43)g]wag significantly lower than that in the control group[(5.79±0.53)g],P<0.05.The relative quantitative expression of TNF was(1.807±0.265)in experimental group the and (1.003±0.021)in the control group(P=0.001).Conclusions Chronic periodonfitis may be related to preterm low birth weight. 相似文献
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塞来昔布增强博来霉素对人舌鳞状细胞癌Tca8113杀伤作用的研究 总被引:1,自引:0,他引:1
目的 研究环氧合酶2(cyclooxygenase-2,COX-2)抑制剂塞来昔布(celecoxib)增强博来霉素(bleomycin)对人舌鳞状细胞癌Tca8113细胞的杀伤作用.方法 用含不同浓度的塞来昔布和博来霉素培养液培养Tca8113细胞24、48、72 h后,甲基噻唑基四唑(MTT)法检测细胞生长抑制率,并采用金正钧法判断药物合用的相互作用;流式细胞术检测Tca8113细胞周期进程和诱导细胞凋亡的作用.结果 小剂量的塞来昔布(10 μmol/L)可增强博来霉素对Tca8113细胞的生长抑制作用,增强博来霉素阻滞Tca8113细胞周期进程的作用,其阻滞G1期细胞进入S期的作用最为明显,导致G0、G1细胞的数量增加[(60.93±0.32)%],S期[(30.57±0.78)%]、G2及M期[(8.50±0.50)%]细胞减少,同时,细胞凋亡率[(1.87±0.11)%]显著提高.结论 小剂量的塞来昔布可增强博来霉素对Tca8113细胞的毒性作用,阻滞细胞周期进程并诱导细胞凋亡. 相似文献
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目的 探讨反义微小RNA-21寡核苷酸(antisense oligonucleotide micro RNA-21,AS-miRNA-21)抑制Tb3.1人舌鳞状细胞癌增殖的效果和机制.方法 实验分3组,①空白对照组;②无义寡核苷酸转染组;③AS-miRNA-21转染组.寡核苷酸介导转染反义寡核苷酸敲低Tb3.1细胞miRNA-21表达.使用荧光实时定量聚合酶链反应(PCR)鉴定转染后Tb 3.1细胞miRNA-21表达水平;甲基噻唑基四唑(MTT)法检测转染后Tb 3.1细胞生存率;流式细胞术检测转染后Tb3.1早期凋亡;Matrigel基质生长实验检测转染后Tb 3.1细胞生长形成球形集落能力;Transwell体外迁移实验检测转染后Tb 3.1细胞迁移能力;蛋白质印迹法检测转染后Tb3.1细胞增殖核抗原(antigen KI-.67,Ki67)、B细胞淋巴瘤2(B cell lymphoma 2,Bcl-2)、人第10号染色体缺失的磷酸酶及张力蛋白同源的基因(phosphatase and tensin homolog,PTEN)、基质金属蛋白酶2、9(matrix metalloproteinase 2/9,MMP-2、MMP-9)和组织基质蛋白酶抑制因子蛋白1(tissue inhibitor of metalloproteinase 1,TIMP-1)蛋白表达.结果 荧光实时定量PCR显示转染后miRNA-21表达水平下调;转染第4天,AS-miRNA-21转染组肿瘤细胞生长速度[(53.43±11.83)%]低于其他两组[(91.32±8.02)%和100%](F=27.02,P=0.00);细胞凋亡率显著升高[(12.23±2.92)%,F=26.641,P=0.001];AS-miRNA-21转染组细胞生长不能形成球形克隆且通过Transwell小室聚碳酸酯膜的细胞数小于空白对照组(F=268.231,P=0.000);Ki67、Bcl-2、MMP-2和MMP-9蛋白表达下调,PTEN和TIMP-1蛋白表达上调.结论 敲低miRNA-21后Tb3.1人舌癌细胞增殖与侵袭能力被抑制,并为探索miRNA-21调控人舌癌发生机制提供实验依据.Abstract: Objective To investigate the effect of micro RNA-21 (miRNA-21) knocking on the Tb3.1 human tongue squamous cell carcinoma growth. Methods Anti-sense miRNA-21 oligonucleotide was delivered with oligofectamine to suppress Tb 3. 1 tongue cancer cell growth in vitro. Real-time polymerase chain reaction (PCR) was conducted to detect the miRNA-21 expression after transfection. Methyl thiazolyl tetrazolium(MTT) assay was used to determine Tb 3. 1 cell survival rate. Apoptosis were examined by flowcytometry. Matrigel matrix and transwell assay were used to determine Tb 3.1 cell colony formation and migration ability. Antigen KI-67 (Ki67), B cell lymphoma (Bcl-2), phosphatase and tensin homolog (PTEN), matrirx metalloproteinase 2(MMP-2, MMP-9) and tissue inhibitor of metalloproteinase 1 (TIMP-1) protein expression in Tb 3. 1 cell were measured by Western blotting. Results miRNA-21 expression was decreased in miRNA-21 antisense oligonucleotide (ASODN) group. The survival rate of Tb 3. 1 cells with AS-miRNA-21 transfection was significantly suppressed (F=27.02, P = 0.00) and early phase apoptosis(F =26. 641 ,P = 0. 001) induced in Tb 3.1 cell. Ki67, Bcl-2, MMP-2 and MMP-9 protein weredown regulated while PTEN and TIMP-1 protein expression was increased. Conclusions Blocking miRNA-21 expression in Tb3.1 cell could suppress cancer cell growth in vitro and miRNA-21 can serve as a novel target candidate for human tongue cancer gene therapy. 相似文献
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目的 体外实验研究Ras基因家族同源物A(ras homolog gene family,member A,RhoA)小干扰RNA(small interfering RNA,siRNA)在舌癌转移中的作用.方法 登录Genebank确定人RhoA基因序列,利用RNA干扰技术针对RhoA的基因序列设计4条短链RNA,构建干扰表达载体,利用LipofectamineTM2000介导法将RhoA siRNA转染至舌癌细胞系Tca8113.转染细胞后48 h检测瞬时表达效率,经杀稻瘟菌素筛选及克隆化培养获得稳定抗性克隆转染株后,蛋白质印迹法检测RhoAsiRNA转染后的抑制效应,细胞计数绘制细胞生长曲线以观察RhoA siRNA转染前后细胞株的生长速度;划痕实验和Millicell小室实验检测转染细胞株的迁移力与侵袭力.结果 舌癌细胞转染RhoA siRNA后:RhoA蛋白表达下降;细胞倍增时间从38.0 h延长至45.7 h;细胞克隆形成率由35.2%降低至15.8%;细胞迁移能力减弱;细胞侵袭能力由100%降至58.9%,显著减弱.结论 RhoA siRNA能有效抑制舌癌Tca8113细胞中RhoA的表达,从而降低细胞增殖水平以及细胞侵袭力和迁移力,表明RhoA siRNA具有抑制舌癌细胞生物学特性的能力,提示RhoA在舌癌转移中可能发挥重要作用. 相似文献
12.
目的 研究短发卡RNA(short hairpin RNA,shRNA)介导的表皮生长因子受体(epidermal growth factor receptor,EGFR)基因沉默对舌鳞状细胞癌细胞增殖和凋亡的影响,为治疗舌鳞状细胞癌提供依据.方法 构建靶向人EGFR的shRNA真核表达载体并瞬时转染人舌鳞状细胞癌细胞株Tca8113细胞,用半定量反转录聚合酶链反应(RT-PCR)和蛋白印迹法检测转染前后EGFR的mRNA和蛋白的变化,用甲基噻唑基四唑(MTT)法检测细胞增殖活性,用流式细胞仪检测细胞凋亡情况.结果 转染后Tca8113细胞的EGFR mRNA和蛋白的表达(0.217±0.047)和(0.324±0.059)均明显下调(P<0.05),细胞增殖活性(0.340±0.009)明显降低(P<0.05),细胞凋亡率(39.4±7.7)%显著增高(P<0.05).结论 shRNA介导的EGFR基因沉默可抑制舌鳞状细胞癌细胞增殖并诱导其凋亡. 相似文献
13.
目的 探讨苯丁酸钠对人舌鳞状细胞癌Tca8113和TCSSA细胞株的生长、凋亡的影响及其分子机制,为临床治疗提供理论依据.方法 应用甲基噻唑基四唑(MTT)法检测苯丁酸钠对人舌鳞状细胞癌细胞株的抑制作用,采用流式细胞仪研究苯丁酸钠对人舌鳞状细胞癌细胞株的细胞周期阻滞和诱导凋亡作用,应用蛋白质印迹法和反转录聚合酶链反应(RT-PCR)检测p21和生存素基因的转录和表达.结果 苯丁酸钠对两种细胞株增殖均有明显的抑制作用;流式细胞仪检测显示苯丁酸钠诱导细胞株G1期阻滞,碘化丙啶-异硫氰酸荧光素标记的磷脂酰结合蛋白双标结果表明,苯丁酸钠能诱导细胞株凋亡,使p21的mRNA及蛋白质表达升高,与对照组比较,Tca8113细胞株的p21 mRNA及蛋白质分别增加0.09±0.08和0.72±0.10,TCSSA细胞株的p21mRNA及蛋白质分别增加1.34 4±0.12和1.56±0.09(P<0.05).生存索的mRNA及蛋白质表达下降.与对照组比较,Tca8113细胞株的生存素mRNA及蛋白质分别降低1.10±0.05和1.14±1.10,TCSSA细胞株的生存素mRNA及蛋白质分别降低1.02±0.08和0.94±0.09(P<0.05).苯丁酸钠诱导p21表达上升和生存素表达下降,二者的mRNA水平变化呈显著负相关(rs=-0.532,P<0.001),蛋白表达变化同样呈显著负相关(rs=-0.564,P<0.001).结论 苯丁酸钠能抑制人舌鳞状细胞癌细胞株增殖,诱导细胞G1期阻滞和细胞凋亡. 相似文献
14.
【摘要】目的利用小干扰RNA ( small interfering RNA ,siRNA)
抑制人舌癌TcaSll3细胞血管内皮生长因子(vascular endothelial growth factor, VEGF )表达,观察其对培养细胞和移植瘤基质金属蛋白酶(matrix metalloproteinases, MMPs )2、-9及基质金属蛋白酶抑制剂(tissue inhibitors of metalloproteinases ,T IMPs)-1、-2蛋白表达的影响。方法以稳定转染携带VEGF.siRNA真核表达载体的Tca8113细胞(VEGF—siRNAl、VEGF—siRNA2)为实验组,以转染空载体的及未转染的Tca8113细胞为实验对照组和空白对照组。将细胞分别接种于裸鼠皮下,用免疫组化法分别测定各组培养细胞和移植瘤VEGF、MMP-2、-9及TIMP.1、-2的蛋白表达。结果各组培养细胞及移植瘤VEGF免疫组化染色:VEGF.siRNAl组、VEGF—siRNA2组与实验和空白对照组相比,平均阳性率降低,平均灰度值增高(P〈0.05);各组培养细胞均未检测出MMP-2、-9及TIMP-1、-2蛋白的阳性表达。各组移植瘤MMP-9、TIMP-1、-2可见阳性表达,但各组染色平均阳性率及平均灰度值之间的差异无统计学意义(P〉0.05),而MMP-2未见明显阳性表达。结论以siRNA干扰沉默人舌癌Tca8113细胞VEGF基因,可明显抑制细胞及移植瘤内VEGF蛋白表达,但是对MMP-2、-9及TIMP-1、-2蛋白的表达无明显影响。 相似文献
15.
目的:观察 N-α乙酰基转移酶(Naa10p)表达对舌鳞癌 Tca8113细胞平阳霉素(PYM)敏感性的影响。方法:采用慢病毒体系分别构建干扰及过表达 Naa10p 的 Tca8113细胞株,并设立相应的对照细胞 Tca8113-LV-NC,鉴定干扰和过表达效率,MTS 法检测药物处理后各处理组细胞对 PYM的敏感性。结果:干扰 Naa10p 的 Tca8113-LV-shNaa10p 细胞、过表达Naa10p 的 Tca8113-LV-Naa10p 细胞与对照细胞 Tca8113-LV-NC 对平阳霉素的半数抑制浓度(IC50)分别为(20.772±0.106)μg/ml、(2.157±0.123)μg/ml、(6.301±0.069)μg/ml(组间比较,P <0.05)。结论:下调 Naa10p 表达可降低口腔鳞癌细胞 Tca8113对平阳霉素的敏感性,上调 Naa10p 表达可增强口腔鳞癌细胞 Tca8113对平阳霉素的敏感性。 相似文献