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1.
Objective:To investigate the effects of Panax notoginseng saponins(PNS)on the proliferation and differentiation in NIH3T3 cells.Methods:NIH3T3 cells were treated by various concentrations of PNS 0,0.05, 0.10,0.20,and 0.40 g/L.The vitality and proliferation potential of cells were detected by 3-(4,5-dimethylthiazol- 2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay,the alkaline phosphatase(ALP)activity was measured by p-nitrophenyl phosphate(pNPP)assay,and the mineralization formation ability was tested for the cellular differentiation toward osteoblast,as well as the expression level of phosphorylated extracellular signal-regulated kinasel/2(P-ERK1/2),extracellular signal-regulated kinasel/2(ERK1/2)protein kinase was analyzed by Western blot with total cell lysate of NIH3T3 cells treated by PNS.Results:Both MTT andρNPP assay showed that optical density(OD)values were increased in response to PNS treatment at a dose-dependent pattern. The mineralization formation ability was enhanced in PNS-treated NIH3T3 cells compared with untreated cells. Meanwhile,the expression level of P-ERK1/2 protein kinase was up-regulated in PNS-treated NIH3T3 cells, while,the expression level of ERK1/2 protein kinase revealed no obvious difference with or without PNS treated cells.Conclusion:PNS could pay a role to promote the proliferation and differentiation in NIH3T3 cells by means of up-regulation of P-ERK1/2 protein kinase.  相似文献   

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To construct the eukaryotic expression plasmid of human PRX3 and measure its expression in the HEK-293FT cells, the full-length coding region of human PRX3 was cloned by PCR and inserted into the eukaryotic expression vector pcDNA4-Xpress (A). HEK-293FT cells were transiently transfected with the recombinant plasmid. Western blot and immuofluorescence were used to detect the expression of the fusion protein. In the experiment, restriction analysis identified the construction of the recombinant plasmid and the inserted sequence was identical with that published on GenBank. Western blot and immunofluorescence confirmed the expression of the recombinant protein in transfected HEK-293FT cells. It was concluded that the eukaryotic expression plasmid of human PRX3 was constructed successfully and the recombinant could he expressed efficiently in HEK-293FT cells, which provides a sound basis for the further study on human PRX3.  相似文献   

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Objective To investigate the feasibility of applying NIH3T3 cells transfected by VEGF gene to the treatment of ischemic random skin flaps.Methods Plasmid PcDNA3.1(-)/VEGF165 containing VEGF gene was transduced into the mouse NIH3T3 cells by liposome.Immunohistochemistry was used to detect the expression of VEGF protein of mouse NIH/3T3 cells in vitro.The NIH3T3 cell were stained with CM-DiI before the transplantation.  相似文献   

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In order to construct plasmid of hypoxia-inducible factor-lalpha (HIF-1α), and transfect into human lung cancer cells A549, the change in sensitivity of lung cancer cells A549 to chemotherapy was observed. HIF-1αmRNA structure region was amplified by RT-PCR and inserted into plasmid pcDNA3. The expression plasmid pcDNA3/HIF-1αwas transfected into A549 with Lipofec-tAMINE?000. The expression of HIF-1αprotein was detected by Western blot. After A549 cells were transfected with HIF-1αprior to addition of 5-Fu, the growth activity was measured by growth curve, apoptosis was detected by flow cytometry at 48 h, and the levels of caspase3 and MDR-1 were determined by Western blot. The results showed that the constructed expression plasmid was analyzed with restriction enzymes and gel electrophoresis. Two DNA lanes at 2.55 kb and 5.4 kb respectively were found, which were consistent with that expected. The growth rate in 5-Fu group was significantly inhibited, and the apoptosis index and caspase3 activity were increased significantly as compared with control group. After HIF-1αbeing transfected into A549, the activity of MDR-1 was increased and the effect of 5-Fu was weakened. In conclusion, HIF-1αcan promote chemoresistance by increasing the activation of MDR1 and suppressing apoptosis during lung cancer cells A549 induced with 5-Fu.  相似文献   

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CCK correlates with the generation and progression of pancreatic cancer. The research aims to construct eukaryotic expression plasmid pIRES2-EGFP/CCK (CCK pDNA) and transiently express it in COS-7 cells. Total RNA was extracted from porcine intestinal mucosa. RT-PCR was used to amplify the aimed segments CCKcDNA which was then digested with EcoR1 and BamH1 and inserted into a eukaryotic expression plasmid pIRES2-EGFP to construct CCK pDNA. The con- structed plasmid was transfected into COS-7 cells by lepofectamineTM2000-mediated transfer method. The expression of CCK in transfected COS-7 cells was detected 24, 48 and 72 h post-transfection with fluorescence microscopy and the expression level of CCK mRNA in transfected COS-7 cells was assayed by using RT-PCR. The results showed CCK pDNA was successfully constructed and expressed transiently in COS-7 cells. Green fluorescent protein could be detected in the COS-7 cells transfected with porcine CCK pDNA 24 h post-transfection. At 48th h post-transfection, the number of positive cells was increased significantly and much brighter green fluorescence could be detected. And 72 h post-transfection, the green fluorescence of positive cells became even stronger, while no green fluorescence was detected in the control group. The expression of CCK mRNA in the cells was detectable by using RT-PCR. In COS-7 cells transfected with CCK pDNA a high level of porcine CCK mRNA was detected while no expression of porcine CCKmRNA was found in the cells trans- fected with null plasmid. It was concluded CCK pDNA was expressed successfully in COS-7 cells, which lays a foundation for further research on the relationship between CCK and tumor.  相似文献   

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In order to construct plasmid of hypoxia-inducible factor-lalpha (HIF-1α), and transfect into human lung cancer cells A549, the change in sensitivity of lung cancer cells A549 to chemotherapy was observed. HIF-1α mRNA structure region was amplified by RT-PCR and inserted into plasmid pcDNA3. The expression plasmid pcDNA3/HIF-1α was transfected into A549 with LipofectAMINE^TM2000. The expression of HIF-1α protein was detected by Western blot. After A549 cells were transfected with HIF-1α prior to addition of 5-Fu, the growth activity was measured by growth curve, apoptosis was detected by flow cytometry at 48 h, and the levels of caspase3 and MDR-1 were determined by Western blot. The results showed that the constructed expression plasmid was analyzed with restriction enzymes and gel electrophoresis. Two DNA lanes at 2.55 kb and 5.4 kb respectively were found, which were consistent with that expected. The growth rate in 5-Fu group was significantly inhibited, and the apoptosis index and caspase3 activity were increased significantly as compared with control group. After HIF-1α being transfected into A549, the activity of MDR-1 was increased and the effect of 5-Fu was weakened. In conclusion, HIF-1α can promote chemoresistance by increasing the activation of MDR1 and suppressing apoptosis during lung cancer cells A549 in- duced with 5-Fu.  相似文献   

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目的:持续感染丙型肝炎病毒(HCV)在肝细胞癌(HCC)发生中起重要作用,细胞转染和成瘤实验表明HCV NS3对人肝细胞具有转化作用和致瘤活性.本实验旨在探讨HCV非结构蛋白3(NS3)转化肝细胞的蛋白质组.方法:构建稳定表达HCV NS3 N端多肽的人肝细胞(pRcHCNS3/QSG)及空白质粒转染细胞(pRcCMV/QSG),双向电泳技术分离两种细胞的总蛋白,差异蛋白质点进行质谱分析,Western印迹验证蛋白表达差异.结果:得到分辨率较高、重复性较好的双向电泳图谱.pRcHCNS3/QSG和pRcCMV/QSG细胞的蛋白质斑点数分别为(1 183±77)和(1 095±82)个,两组平均匹配数为(920±60)个.初步鉴定出15个有意义的蛋白质点.其中Ras,P38,HD53等参与调节信号转导的蛋白在pRcHCNS3/QSG细胞中表达上调,Western印迹结果亦证实pRcHCNS3/QSG细胞中磷酸化的P44/42和P38表达增加.鉴定出的差异蛋白质还包括一些调节细胞周期、免疫反应、与肿瘤侵袭和转移相关的蛋白质及参与肝脏代谢的蛋白质.结论:HCV NS3可能通过影响多种蛋白表达,经相应信号转导途径,如丝裂原活化蛋白激酶途径,使细胞发生恶性转化.进一步弄清信号转导过程和相互关系不仅对了解HCV相关性HCC的发生机制有重要意义,而且为从分子水平治疗HCC提供新思路.  相似文献   

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目的:建立丙型肝炎病毒NS 3区不同末端的COS和NIH 3T3的细胞系表达系统,以探讨其慢性化及肝癌的发病机理.方法:用脂质体共转录法,将含有丙型肝炎病毒NS 3区不同末端的重组质粒pSG 5 neo转录至COS和MH 3T3细胞系中表达,并用聚合酶链反应(polymerase chain reaction,PCR)和Southern blot法在DNA水平检测.用Western blot法在蛋白水平检测.结果:在转录的COS和MH 3T3的细胞系中,存在有丙型肝炎病毒NS 3在3和5基因片段,并可表达相应的抗原.结论:此表达细胞系的建立,有利于对丙型肝炎病毒的复制,丙型肝炎慢性化及肝癌发病的研究.  相似文献   

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目的:构建半乳糖凝集素-3(Gal-3)的真核表达载体,在NIH/3T3细胞中表达,并检测其表达?方法:通过DNA重组技术和PCR方法从人肿瘤细胞克隆Gal-3基因,插入真核表达载体pEGFP-N1中,通过酶切和测序鉴定重组载体的正确性;采用脂质体转染技术将重组质粒pEGFP-Gal-3瞬时转染NIH/3T3细胞,经荧光和Western blot方法检测Gal-3表达,MTT法检测Gal-3对NIH/3T3细胞增殖的影响?结果:限制性内切酶鉴定和核酸序列测序证实成功构建含Gal-3的重组真核表达载体pEGFP-Gal-3?以重组质粒瞬时转染NIH/3T3细胞,检测到Gal-3蛋白表达,并证实Gal-3蛋白促进NIH/3T3细胞增殖?结论:成功构建的pEGFP-Gal-3真核表达载体在小鼠NIH/3T3细胞中成功表达,并促进NIH/3T3细胞增殖?  相似文献   

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目的:探讨丙型肝炎病毒(HCV)非结构蛋白NS5A的反式激活作用。方法:扩增HCV NS5A基因,构建HCV NS5A基因真核表达载体pcDNA3.1(-)—NS5A;并转染肝母细胞瘤细胞系HepG2细胞,免疫印迹方法检测转染细胞中HCV NS5A蛋白的瞬时表达;与报告质粒pCAT3--promoter共转染HepG2细胞,用酶联免疫吸附方法检测细胞中氯霉素乙酰转移酶(CAT)的表达活性。结果:质粒pcDNA3.1(-)—NS5A在HepG2细胞瞬时表达HCV NS5A蛋白,共转染实验中pcDNA3.1(-)—NS5A组的CAT表达活性是空质粒对照组的3.8倍。结论:构建的表达载体能在哺乳动物细胞中表达出相应蛋白,并能够反式激活SV40病毒早期启动子。本研究为进一步克隆HCV NS5A蛋白反式激活的靶基因,深入阐明HCV NS5A蛋白致肝细胞癌发生的分子生物学机制提供依据。  相似文献   

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目的:探讨人胰岛素样生长因子1(hIGF-1)基因转染对成纤维细胞增殖的影响。方法:用脂质体转染法将pcDNA3.1-hIGF-1质粒转染鼠成纤维细胞NIH3T3,经G418筛选抗性NIH3T3细胞并继续培养4周,进行原位杂交和免疫细胞化学检测hIGF-1的表达,MTT方法和流式细胞仪检测NIH3T3细胞增殖能力。结果:转染pcDNA3.1-hIGF-1后的NIH3T3细胞内有大量hIGF-1 mRNA和蛋白质的表达;MTT检测显示转染pcDNA3.1-hIGF-1的NIH3T3细胞光吸收值增大,与未转染的NIH3T3细胞组比较,差异具有显著性(P<0.01);流式细胞仪检测显示转染组细胞,S期比例增加(59.3%),G1期比例减少(27.2%)。结论:pcDNA3.1-hIGF-1质粒转染成纤维细胞后,可以获得稳定表达,并能明显促进成纤维细胞的增殖。  相似文献   

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尹宗生  张辉  张胜权  王伟  华兴一  胡勇  李光武 《医学争鸣》2006,27(24):2212-2215
目的:表达具备生物活性的重组小鼠Wnt-3a信号蛋白.方法:应用脂质体转染试剂将重组真核表达载体pSecTag2/Hygro B-Wnt3a转染并筛选稳定表达的NIH3T3细胞,Western Blot鉴定重组Wnt-3a蛋白的表达,并对Wnt3a/NIH3T3细胞的融合密度及抗凋亡能力给予检测.结果:Wnt-3a信号蛋白在Wnt3a/NIH3T3细胞中获得稳定表达,Wnt-3a信号蛋白能够明显提高NIH3T3细胞的融合密度及抗凋亡能力.结论:在NIH3T3细胞中表达的重组Wnt-3a信号蛋白具备生物活性.  相似文献   

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目的:构建丙型肝炎病毒(HCV)非结构基因NS3的真核表达载体,并分析其在HeLa细胞中的表达。方法:以HCV全长cDNA质粒为模板进行PCR扩增,获得全长NS3基因,将其插入克隆载体pMD18-T中,鉴定后与真核表达载体pcDNA3.1(+)重组,用脂质体介导法转染HeLa细胞,间接免疫荧光法及Western blot鉴定转染后HCVNS3蛋白的表达。结果:PCR扩增的NS3序列正确,构建的真核表达载体成功转染HeLa细胞,表达的NS3蛋白相对分子量为70kD。结论:成功构建了真核表达载体pcDNA3.1(+)/NS3,并在HeLa细胞中获得表达。  相似文献   

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目的探讨外源性人端粒酶催化亚单位(hTERT)对人视网膜血管内皮细胞(hRCEC)端粒酶活性、相关基因表达和体外生存时间的影响。方法阳离子脂质体介导hRCEC转染;RT-PCR法检测人类端粒酶RNA组份(hTR)、端粒酶相关蛋白1(TEP1)及hTERT基因的表达;TRAP法检测端粒酶活性;细胞计数法绘制生长曲线。结果hTR、TEP1基因在hTERT转染hRCEC前后都表达,hTERT基因在转染前不表达,转染后24h及稳定转染克隆形成时表达,细胞停止分裂时又失去表达;转染前无端粒酶活性,转染后24h及稳定转染克隆形成时可检测到端粒酶活性,细胞停止分裂时端粒酶活性消失;稳定转染了hTERT基因后hRCEC的生存时间没有延长。结论hTERT转染可显著提高hRCEC中hTERT基因表达水平,hTERT基因表达与端粒酶活性一致,但只用hTERT转染的方法不能使hRCEC细胞生存时间延长。  相似文献   

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胡蕴玉  谭祖键 《中华医学杂志》2001,81(17):1070-1073
目的 通过基因转染方法,使成纤维细胞NIH-3T3细胞具有合成及分泌骨形态发生蛋白(BMP)、体内诱导新骨生成的能力。方法 定向克隆法将BMP3基因构建于PcDNA3表达载体,脂质体介导法转染NIH-3T3细胞,G418筛选获得稳定转化体,Northern印迹法检测转染细胞有无BMP3基因表达,免疫组织化学检测转染细胞内的BMP3蛋白合成,钙钴法染色不同时相的转染细胞碱性磷酸酶并作图像分析。将转染细胞注入裸鼠肌袋,观察注射后第4周诱导新骨生成情况。结果 转染细胞体外培养6周Northern印迹法检测到有明显的BMP3基因表达,免疫组织化学染色见转染细胞培养筛选5-8周后细胞浆内有染成黄色的BMP3蛋白质颗粒出现,图像分析蛋白质生成在转染后第6周达高峰。钙钴法碱性磷酸酶染色及图像分析示转染细胞内碱性磷酸酶明显高于同期对照组,两组间有显著性差异(P<0.01)。被转染NIH-3T3细胞裸鼠肌袋诱导成骨实验见注射后4周注射部位有大量软骨细胞出现,并伴有骨小梁生成。结论 通过基因转染方法可以使NIH-3T3细胞具有合成及分泌内源性BMP的能力,合成及分泌的BMP具有良好的生物活性,肌袋实验具有诱导成骨作用。但是,由于基因治疗的某些不可控性因素,其安全性仍有待于进一步研究。  相似文献   

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目的构建小鼠24p3基因真核表达载体并观察其稳定转染的NIH3T3细胞中24p3/SIP24蛋白的表达情况,初步鉴定24p3/SIP24蛋白介导铁向细胞内转运的生物学功能.方法RT-PCR自小鼠肺组织中克隆24p3 cDNA.用基因重组技术构建24p3-pcDNA3.0真核表达载体并行酶切和测序鉴定.脂质体DOTAP方法转染NIH3T3细胞,48 h后用G418筛选阳性克隆并培养扩增至21 d.对阳性克隆的培养基上清中24p3/SIP24蛋白的表达用ELISA和Westernblot分析,进一步用原子吸收分光光谱观察其介导铁向NIH3T3细胞内转运的生物学功能.结果成功克隆24p3cDNA并构建24p3-pcDNA3.0真核表达载体,筛选出稳定表达24p3/SIP24蛋白的NIH3T3细胞株,24p3/SIP24蛋白在NIH3T3细胞上清中获得表达,并能介导铁向NIH3T3细胞内转运.结论24p3基因在NIH3T3细胞中获得表达,有良好的生物学活性,为进一步研究24p3/SIP24蛋白介导铁转运的生物学功能及作用机制奠定了基础.  相似文献   

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