首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到19条相似文献,搜索用时 109 毫秒
1.
Background Most of gynecologic malignancies are sensitive to chemotherapy. Myelosuppression is the main dose-related toxicity of many chemotherapeutic drugs. The human multidrug resistance (mdrl) gene is well known for its ability to confer drug resistance. This study aimed to explore the feasibility of expression and resistance of mdrl gene transduction into human placenta mesenchymal stem cells (P-MSCs) by retrovirus vector. Methods Human P-MSCs were isolated from trypsin-digested term placentas, and their immunophenotypes and differentiation potential were evaluated. Human P-MSCs were transduced by reconstructed retroviral vector containing the mdrl gene and green fluorescent protein (GFP) reporter gene. The integration and expression of the mdrl gene were observed indirectly by the expression of GFP, and fluorescence-activated cell sorter was used to evaluate the functional activity of permeability glycoprotein (P-gp) encoded by the mdrl gene. The stimulating test was made in vitro to show pleiotropic drug resistance of transfected cells. Results The isolated, cultured and expanded P-MSCs expressed stem cell markers such as CD29, CD44 and CD73, and showed osteogenic and adipogenic differentiation potentials under appropriate conditions. The expression of P-gp in the non-transfected P-MSCs cells was (0.4±0.1)%, but increased to (28.1±4.7)% after gene transfection (P〈0.01). And positive staining of P-gp located mainly at cell membrane and cytoplasm. Accumulation and extrusion assays showed that P-gp expressed by the transfected cells had pump-functional activity and could efflux daunomycin out of cells. The analysis of cell survival confirmed that transfected P-MSCs had a characteristic of multidrug resistance with a significant increase in the resistance to anticancer agents. Conclusions Transfer and expression of human mdrl gene mediated by retrovirus vector conferred P-MSCs drug resistance. It might provide a new alternative to chemoprotection strategies.  相似文献   

2.
Objective To investigate the expression and meaning of MRP3 in different tumor cells. MethodsThe monoclonal antibody against MRP3 was used to identify the expression of MRP3 by flow cytometer in seven tumor cells and human embryo kidney cell lines 293T.And RT-PCR was used to detect the mRNA of MRP3 in eight cell lines. ResultsThe mRNA of MRP3 was expressed in three pancreatic carcinoma cell lines.MRP3 protein was observed in BxPC-3 and AsPC-1 cells. ConclusionMRP3 may express in different tumor in tissue-specific manner.BxPC-3 and AsPC-1 may serve as cellular models for in vitro studies on multidrug resistance of pancreatic carcinoma.  相似文献   

3.
The effects of tissue factor (TF) on doxorubicin-induced apoptosis in human neuroblas-toma were investigated. The expression of TF was examined by Western blotting. TFsiRNA-pSUPER plasmid was constructed by inserting specific 19-nt silencing sequence targeting TF gene into pSU-PER vector. Transfection of TFsiRNA-pSUPER was performed using lipofectamine2000. The cytotox-icity of doxorubicin was determined by WST assay. The activation of Caspase-3 and PARP induced by doxorubicin was tested by Western blotting. The apoptotic cells were stained by Hochest33342 and counted under fluorescence inverted microscope. It was found that human neuroblastoma cell line SK-N-MC expressed high level of TF. Knockdown of the TF expression was achieved by trans-fection of TFsiRNA-pSUPER on SK-N-MC cells in a dose-dependent manner. Inhibition of TF sig-nificantly decreased the viability of transfected SK-N-MC cells treated with different concentrations of doxorubicin. Cleavage of Caspase-3 and PARP was enhanced in transfected SK-N-MC cells with down-regulation of TF. TFsiRNA treatment significantly increased the number of apoptotic cells in transfected SK-N-MC cells as compared with those control cells (P<0.05) when these cells were ex-posed to 1 μg/mL doxorubicin for 8 h. These results suggested that knockdown of the TF expression by specific siRNA vector could increase the cytotoxicity of doxorubicin and enhance doxorubi-cin-induced apoptosis in human neuroblastoma cells. Over-expression of TF might contribute to chemotherapy resistance in human neuroblastoma and its progression, at lest in part, by regulating doxorubicin-induced apoptosis.  相似文献   

4.
In order to investigate the effects of vector-based hairpin small interference RNA (shRNA) on the reversal of multi-drug resistance (mdr) of A2780/Taxol cells, a novel vector pEGFP-HI/mdrl containing mdrl-shRNA targeting at position 2943-2963 of mdrl was designed and synthesized. Subsequently, A2780/Taxol cells were transfected with pEGFP-H1/rndrl, and the expression ofmdrl mRNA and P-gp was detected by using RT-PCR and Western blot respectively. MTT was used to measure the 50% inhibition concentration (IC50) of Taxol to A2780/Taxol cells. The results showed that at the 24th and 48th h after transfection, the expression of mdrl mRNA was decreased to (52.1±1.0)% and (0.01±1.7)%, and that of P-gp decreased to (88.3±2.1)% and 0%, respectively. At the 48th h after transfection, the relative reversal rate of A2780/Taxol cells to Taxol was 69.54%. In vivo, the nude mice xenografts were injected with pEGFP-H1/mdrl, and then administrated Taxol. The tumor volume in pEGFP-H1/mdrl-transfected group was significantly reduced as compared with that in blank control group or pEGFP-Hl-transfected group (807.20±103.16 vs 1563.78±210.54 or 1480.78±241.24 mm^3, both P〈0.01). These results suggested that transfection of pEGFP-HI/mdrl could efficiently down-regulate the expression of mdrl mRNA and P-gp in A2780/Taxol cells, and effectively restore the sensitivity of A2780/Taxol ceils to Taxol both in vitro and in vivo.  相似文献   

5.
Background Multidrug resistance to chemotherapeutic agents is an important clinical problem during the treatment of leukemia. The resistance process is multifactorial. To realize the total factors involved in multidrug resistance, we analyzed the differentially expressed proteins of K562 and K562/ADM cells and we investigated one of the up-regulated proteins (CRKL) using siRNA to determine its role in K562/ADM cells. Methods Altered protein expressions between K562/S (K562 ADM-sensitive cell line) and K562/ADM (K562 multidrug resistant cell line induced by adriamycin) were identified by 2D-DIGE coupled with mass spectrometry. Meanwhile, we confirmed the differential expression of CRKL and Stathmin in both K562 and K562/ADM cells by Western blot analysis. Furthermore, we used RNA interference to silence the CRKL gene expression. Results Among the 9 differentially expressed proteins, 3 were up-regulated in K562/ADM cells, while 6 were down-regulated in the K562/ADM cells compared with its parent cell line. The expression of CRKL was up-regulated significantly in K562/ADM cells, and it can be decreased by recombinant lentivirus. Moreover, the multidrug resistance of K562/ADM cells was efficiently reversed by silence of CRKL gene expression. Conclusions The data provided the differentially expressed proteins in K562 and its resistant cell line and highlights the power of 2D-DIGE for the discovery of resistance markers in cancer. We found CRKL may be a new protein involved in the multidrug resistanse of leukaemia cells.  相似文献   

6.
7.
Objective To investigate the anti-idiotypic effect induced by a monoclonal antibody. Methods A conventional fusion method was used to obtain hybridoma cells produing monoclonal antibody, which were detected by flow cytometry. ELISA were used to detect the humoral response induced by the antibody in mice. Cytotoxic and proliferation experiments were used to detect the cellular response induced by the antibody in mice. Results CS20 is a MUC-1 specific monoclonal antibody that strongly reacts with MUC-1 antigen expressed on the cell surface of breast cancer cells. The antibody could not kill tumor cells directly through complement-dependant cytotoxicity or antibody-dependant cell-mediated cytotoxicity. However, after 6 administrations of mAb CS20-KLH (keyhole limpet hemocyanin) conjugated to BALB/c mice (n=5) at a dose of 50 μg/mouse, anti-idiotypic antibodies and anti-anti-idiotypic antibodies were induced. T cells derived from CS20-KLH-immunized mice responded to mAb CS20, indicating the existence of idiotype-specific T cells. Conclusion These data indicated the possibility of using MUC-1 specific antibody for active immunotherapy of breast cancer.  相似文献   

8.
9.
10.
The cellular sources of leukoregulin (LR) and lymphotoxin (LT) from humanperipheral blood leukocytes or spleen cells were examined.The ratios of LT activity to LRactivity in lymphokine preparations from different individuals were not constant but variedover 640-fold,suggesting that LR and LT activities were mediated by distinctly differententities.Purified LR was used to examine the relative susceptibilities of human or micecells to LR.Most human tumor cells were very sensitive to LR while human normal cellsand mice normal or tumor cells were less sensitive or resistant.Crude preparations ofhuman interferon Hu IFN-γ or Hu IFN-α were more cytotoxic to human tumor cells thanpartially purified natural Hu IFN-γ or highly purified rHu IFN.αD,and crude or purifiedLR were more cytotoxic to human tumor cells than Hu IFN-γ or Hu IFN-α.Hu IFN-γactivity but not cytotoxic activity could be removed from preparations containing Hu IFN-γ,LR and LT activities with the aid of monoclonal antibody to Hu IFN-γ.Natural Killercytotoxic factor (NKCF) supernatants from the co-culture of human spleen cells and NKsusceptible cell line K562 or Molt-4 were strongly cytotoxic to various tumor cell lines.TheNKCF activity was completely inactivated by incubating at pH 2 for 24 h.The putativereceptor for LR or LT was studied using adsorption assay.The present study reveals thathuman LR activity can be adsorbed from crude LR supernatants by incubation with nativeor formalin-treated K562 or SMMC.7721 cells at 37℃ or 4℃;LT activity can be adsorbedwith L929 cells.Therefore,LR appears to be a cytotoxic/cytostatic factor that is distinctfrom LT,IFN and NKCF.  相似文献   

11.
增加CIK细胞耐药性及杀瘤活性机制的研究   总被引:1,自引:0,他引:1  
目的 常规方法培养CIK细胞,将多药耐药基因(mdr1)转入细胞内,观察转染前后其对卡铂的耐药性及杀瘤活性机制进行研究.方法 将mdr1的重组质粒转染到对数生长期的CIK细胞,通过RT-PCR鉴定耐药基因表达;Western blot检测mdr1编码的P-gp蛋白的表达;MTT法检测转染前后CIK细胞对卡铂敏感性的变化.结果 在转染mdr1基因后的CIK细胞中,mdr1 mRNA阳性,P-gp的表达较转染前CIK细胞及转染空质粒的CIK细胞明显增高,差异有统计学意义(P<0.05),转染mdr1基因后的CIK细胞对卡铂的耐药性明显提高.结论 mdr1基因转入CIK细胞后,细胞获得了对卡铂的耐药性.  相似文献   

12.
Li L  Wang T  Xu ZL  Yu Y  Chen W  Chen F 《中华医学杂志》2005,85(23):1633-1637
目的 探讨五味子乙素(SchB)对转染多药耐药1基因(MDR1)的人乳腺癌细胞MCF-7的多药耐药逆转作用及相关机制。方法 将人MDR1基因导入MCF-7细胞,形成耐药细胞株MCF-7/MDR1;用该细胞株为模型评价SchB的体外逆转多药耐药作用,用MTT法进行化疗药物单独或与SchB联合作用时对耐药细胞的IC50比较,计算逆转倍数。结果 转染细胞MCF-7/MDR表现为P糖蛋白高表达,对阿霉素、长春新碱、紫杉醇、高三尖杉酯的抗药性均增加;SchB(25μmol/L)显著减少阿霉素、长春新碱、紫杉醇和高三尖杉酯对MCF-7/MDR细胞的IC50,逆转倍数达6.03-23.94倍;SchB(25μmol/L)使MCF-7/MDR细胞对若丹明123的胞内积聚增加约5倍。效果与维拉帕米10μmol/L浓度时相当;但SchB(25μmol/L)不影响MCF-7/MDR细胞的P-糖蛋白表达。结论 SchB能有效逆转转染MDR1的MCF-7细胞的多药耐药,其机制可能是抑制了P-糖蛋白的药物外排生物学活性。  相似文献   

13.
逆转录病毒转染法建立耐药性大鼠CRBH-7919细胞系   总被引:6,自引:0,他引:6  
目的:建立高效、稳定的大鼠CRBH-7919多药耐药细胞系.方法:利用逆转录病毒转染法将带有mdr1 cDNA全序列的逆转录病毒载体pHaMDR转入到大鼠CRBH-7919细胞中,MTT法检测细胞系在不同化疗药物作用下的存活率;免疫组化检测细胞的P-糖蛋白(P-GP)表达,RT-PCR检测细胞内mdr1 mRNA的表达量,PCR检测mdr1基因转移到细胞内的基因片段.结果:转基因的细胞系对阿霉素、丝裂霉素的耐药性分别提高 9和7.9倍,免疫组化见转基因细胞系P-GP表达增加,RT-PCR示细胞内mdr1 mRNA的表达量增加,PCR表明转基因细胞内扩增出mdr1片段.结论:利用逆转录病毒转染法成功建立了大鼠CRBH-7919多药耐药细胞系,该细胞系具有耐药强度高、耐药性稳定等特点.  相似文献   

14.
目的:探讨细胞因子诱导的杀伤细胞(cytokine-induced k iller, CIK)与化疗药物对多药耐药(multidrug resistance, MDR)肿瘤细胞产生协同杀伤效应的机制.方法:用细胞培养法加细胞因子在体外诱导并扩增CIK细胞,应用MTT法测定CIK细胞、阿霉素及二者联合对靶细胞的杀伤活性,用流式细胞术检测靶细胞上P糖蛋白(P-gp) 的表达和细胞内药物积累,用细胞免疫组化方法检测P-gp在MDR靶细胞MCF7adr内的分布.结果:CIK细胞可使MCF7adr细胞P-gp的表达活性下降82.5%,耐药靶细胞内阿霉素积累增加3 .2倍,使联合杀伤率比单纯加阿霉素(同等剂量)组增加7.8倍,比单纯加CIK细胞(相同效靶比)组增加1.3倍.结论:CIK细胞可明显抑制MCF7adr肿瘤细胞系的P-gp表达,可协同阿霉素提高对MCF7adr肿瘤细胞系的杀伤活性.  相似文献   

15.
目的 用RNA干扰技术下调白血病耐药细胞系K562/A02多药耐药基因mdr1的表达以逆转白血病对化学药物的耐药性.方法 针对mdr1基因已知mRNA序列不同位点,选择两条靶序列,构建靶向mdr1 shRNA真核表达载体,脂质体介导转染白血病耐药细胞株K562/A02.实时荧光定量RT-PCR检测mRNA表达,Western blot检测细胞膜P-gp表达,柔红霉素泵出试验检测P-gp外排泵功能,MTT法检测细胞对阿霉素的敏感性.结果 构建了二条针对mdr1基因的shRNA真核表达载体,分别下调mdr1 mRNA的表达89.74%和87.18%,降低细胞膜P-gp表达,使膜外泵功能明显下降,柔红霉素在细胞内贮留明显增多,60min 时柔红泵出率为13.16%、22.02%,对照组为40.44%、45.31%,对阿霉素药物敏感性的相对逆转率为84.36%和76.69%.结论 RNA干扰技术可有效逆转mdr1所致耐药.  相似文献   

16.
The role of c-myc in regulating mdr1 gene expression in tumor cell line KB   总被引:5,自引:0,他引:5  
Thec mycproto oncogeneplaysaroleinmanycellularprocesses ,suchasproliferation ,differentiationandapoptosis Itisanearly responsegenenecessaryforcell cycleprogression (G1 Stransition)andactivatesquiescentcellsintothecellcycle (G0 G1transition) Down regulationofc …  相似文献   

17.
mdr1单因素耐药白血病细胞株的构建   总被引:1,自引:0,他引:1  
目的 构建mdrl单因素耐药白血病细胞株,为研究RNA干扰逆转mdr1所致耐药提供细胞模型。方法 将含mdr1 cDNA全长的真核表达载体通过脂质体转染人对化疗药物敏感的K562细胞内,G418筛选获得转基因单克隆细胞.用RT-PCR检测有无mdr1表达、流式细胞技术检测细胞表面P-gp蛋白含量、Rh123泵出实验检测P-gp功能、MTT检测细胞对药物的敏感性。结果 转mdr1基因细胞K562/mdr1能较高水平表达mdr1,明显表现出对化疗药物的耐药性。结论 通过转基因方法构建mdr1单因素耐药细胞株可为RNA干扰逆转mdr1提供更精确的细胞研究模型。  相似文献   

18.
X射线照射后鼻咽癌细胞多药耐药基因的表达   总被引:14,自引:1,他引:13  
目的 通过检测射线照射前后鼻咽癌CNE1细胞多药耐药基因(mdr1基因)及其编码产物P糖蛋白(P-gp)的表达和功能为临床鼻咽癌放化疗顺序提供参考。方法 利用RT-PCR、Western blotting和流式细胞仪检测射线照射前后CNE1细胞的mdr1基因和P-gp的表达及对柔红霉素的外排功能。结果 鼻咽癌CNE1细胞射线照射前mdr1基因、P-gp不表达;照射后较长时间内mdr1基因、P-gp均明显表达;对柔红霉素的摄取较射线照射前低。结论 鼻咽癌CNE1细胞射线照射后化疗敏感性降低,提示临床对于中晚期鼻咽癌的治疗应考虑先化疗再放疗即诱导化疗的治疗方案。  相似文献   

19.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号