欧白芷素对K562/A02细胞阿霉素耐药的逆转作用(英文)

目的:探讨欧白芷素对耐药细胞株K562/A02中P-糖蛋白(P-glycoprotein,P-gp)的影响,为抗白血病多药耐药(multi-drug resistance,MDR)提供新方法。方法:采用MTT法观察阿霉素对细胞活力的影响。应用流式细胞术检测欧白芷素对K562和K562/A02细胞内阿霉素累积和细胞中P-gp功能的影响。采用实时定量RT-PCR技术检测MDR1基因在mRNA表达水平的变化。结果:欧白芷素对耐药细胞株K562/A02有显著的逆转耐药活性,最大逆转倍数为7.36。在K562/A02细胞中,欧白芷素明显增加阿霉素的累积,增加了罗丹明123(rhodaminel123,Rh123)蓄积,抑制了Rh123的外排,同时欧白芷素还在mRNA水平抑制了K562/A02细胞中P-gp的表达。结论:欧白芷素能够抑制K562/A02耐药细胞株中MDR1基因表达和P-gp的功能。     

半枝莲逆转白血病细胞株K562/A02耐药性的实验研究

目的:探讨半枝莲对白血病细胞株K562/A02耐药性逆转能力的影响。方法:体外培养K562细胞,分别加入高三尖杉酯碱(HHT)、长春新碱(VCR)、阿霉素(ADM)3种药物得到耐药细胞株K562/A02,MTT比色法检测半枝莲含药血清对3种K562/A02耐药性逆转作用的影响。结果:不同浓度的半枝莲含药血清均能够逆转K562/A02细胞的多药耐药性。结论:半枝莲在一定程度上能够逆转肿瘤细胞的多药耐药性,提高对化疗药物的敏感性。     

解毒化淤药血清对K562/A02细胞P-gp、Bcl-2影响的研究

目的探讨解毒化淤中药血清对白血病K562/A02耐药细胞P-gp、Bcl-2基因表达的影响。方法应用血清药理学方法制备解毒化淤药的兔血清,以MTT法检测含药血清处理后K562/A02耐药细胞对化疗药物的敏感性;免疫组化方法检测P-gp、Bcl-2的表达。结果 MTT结果显示不同浓度中药血清对K562/A02细胞均有耐药逆转作用,其逆转倍数随剂量增加而增大;免疫组化结果显示解毒化淤药中药血清能够下调K562/A02细胞P-gp和Bcl-2的表达。结论解毒化淤药逆转K562/A02细胞耐药的机制可能是通过下调P-gp、Bcl-2的表达而逆转耐药的。     

解毒化瘀药逆转白血病K562/A02细胞多药耐药作用的研究

目的:探讨解毒化瘀中药复方含药血清对白血病K562/A02细胞的耐药逆转作用。方法:应用中药血清药理学方法制备解毒化瘀药的兔血清,以MTT法检测经含药血清、干扰素、川芎嗪处理后K562/A02细胞对化疗药物的敏感性;流式细胞仪检测K562/A02耐药细胞内柔红霉素(DNR)的潴留情况。结果:MTT结果显示,3组药物对K562/A02细胞的耐药逆转倍数分别为9.30倍、5.27倍和3.36倍,其耐药逆转率均在70%以上;流式细胞仪检测结果显示3种药物均可明显增加K562/A02细胞内DNR的浓度,解毒化瘀药含药血清作用最强,与川芎嗪组相比具有显著差异(P<0.01),但与干扰素组相比无明显差异(P>0.05)。结论:3种药物均对K562/A02细胞的耐药具有逆转作用,逆转强度依次为解毒化瘀药含药血清、干扰素、川芎嗪。     

姜黄素水解物对K562/A02细胞多药耐药的逆转作用研究

目的:研究姜黄素水解物对K562/A02细胞多药耐药的逆转作用,初步探讨其逆转机制。方法:MTT法检测姜黄素水解物处理后K562/A02细胞对常用化疗药物敏感性的变化;免疫组织化学法检测姜黄素水解物处理后K562/A02细胞与其亲本K562细胞膜P-gp的表达;流式细胞术检测K562和K562/A02细胞内柔红霉素(DNR)的平均荧光强度(mean fluo-rescene intendity,MFI);RT-PCR法检测K562/A02细胞mdr1 mRNA。结果:用2.5 mg.L-1姜黄素水解物处理后K562/A02细胞对常用化疗药物敏感性提高;姜黄素水解物能降低K562/A02细胞膜P-gp的表达(P0.05)。K562/A02细胞内DNR的MFI低于K562细胞(P0.01),姜黄素水解物能增加K562/A02细胞内DNR的MFI(P0.05);姜黄素水解物处理后K562/A02细胞内mdr1 mRNA下降。结论:姜黄素水解物具有体外逆转K562/A02细胞多药耐药的作用,且降低K562/A02细胞膜P-gp的表达降低化疗药物外排增强化疗药物在细胞内的潴留可能是其逆转作用的机制之一。     

当归药物血清逆转K562/A02细胞对阿霉素耐药性的初步观察

目的:以白血病多药耐药细胞系K562/A02为对象,观察当归能否逆转其对阿霉素的耐药性.方法:采用MTT法观察当归药和血清对阿霉素细胞抑制率的影响(IC50).结果:经MTT法发现当归药物血清能增加K562/A02对阿霉素的敏感性,使阿霉素半数抑制浓度(IC50)由14.9mg/L,降至9.17mg/L,部分逆转了K562/02对阿霉素耐药性,逆转倍数为1.63倍.而当归对K562/S敏感细胞系无上述作用.结论:当归能部分逆转K562/A02细胞对阿霉素的耐药性.     

白血病K562/A02细胞Mdr1基因的表达及解毒化淤药干预作用研究

目的探讨解毒化淤药含药血清对白血病K562/A02细胞Mdr1耐药基因表达的影响。方法应用半定量逆转录聚合酶链反应(RT-PCR)法检测解毒化淤药含药血清处理后K562/A02细胞Mdr1基因的表达,并与干扰素作对照。结果解毒化淤药含药血清能够降低K562/A02细胞Mdr1基因的表达。结论解毒化淤药含药血清通过降低K562/A02细胞Mdr1耐药基因的表达,逆转白血病细胞耐药。     

白血病K562/A02细胞Mdrl基因的表达及解毒化淤药干预作用研究

目的 探讨解毒化淤药含药血清对白血病K562/A02细胞Mdrl耐药基因表达的影响.方法 应用半定量逆转录聚合酶链反应(RT-PCR)法检测解毒化淤药含药血清处理后K562/A02细胞Mdrl基因的表达,并与干扰素作对照.结果 解毒化淤药含药血清能够降低K562/A02细胞Mdrl基因的表达.结论 解毒化淤药含药血清通过降低K562/A02细胞Mdrl耐药基因的表达,逆转白血病细胞耐药.     

解毒化淤药对白血病K562/A02、HL60/Adr细胞P-gp、Bcl-2、P53基因表达影响的研究

目的探讨解毒化淤中药复方含药血清对白血病K562/A02、HL60/Adr细胞P-gp、Bcl-2、P53基因表达的影响。方法应用中药血清药理学方法制备解毒化淤药的兔血清,以MTT法检测经含药血清处理后K562/A02、HL60/Adr细胞对化疗药物的敏感性;免疫组化方法检测P-gp、Bcl-2、P53耐药基因表达情况。结果 MTT结果显示不同浓度解毒化淤含药血清对K562/A02、HL60/Adr细胞均有耐药逆转作用,其逆转倍数随剂量增加而增大;免疫组化结果显示解毒化淤药含药血清能够降低K562/A02、HL60/Adr细胞耐药基因P-gp和抗凋亡基因Bcl-2的表达,但对P53基因无影响。结论解毒化淤方含药血清逆转白血病K562/A02、HL60/Adr细胞耐药的机制是降低P-gp和bcl-2的表达而逆转耐药的,对P53基因表达无影响。     

解毒化瘀方对白血病K562/A02细胞耐药逆转作用及NF-κB信号表达的影响

目的:探讨解毒化瘀方中药血清对白血病K562/A02耐药细胞耐药逆转作用及NF-κB信号表达的影响。方法:采用MTT法检测解毒化瘀方中药血清对K562/A02细胞毒作用,流式细胞仪检测解毒化瘀方中药血清对K562/A02细胞内化疗药物浓度的影响,用Western blot法检测解毒化瘀方中药血清对NF-κB/P65、NF-κB/P50、IκBα的表达的影响。结果:解毒化瘀方中药血清对K562/A02细胞生长抑制作用呈浓度依赖性,能够增加K562/A02细胞内化疗药物的浓度,下调K562/A02细胞NF-κB/P65、NF-κB/P50、IκBα表达,从而降低NF-κB信号。结论:解毒化瘀方中药血清能够逆转K562/A02细胞耐药,其耐药逆转机制可能与下调K562/A02细胞NF-κB信号表达有关。     

复方三根制剂对MDR细胞株K562/ADR和K562/VCR逆转作用的研究

目的：研究复方中药——复方三根制剂对多药耐药(MDR)细胞株的逆转作用。方法：应用MTT比色法，观察复方三根制剂对MDR细胞的逆转作用。运用流式细胞仪(FCM)，测定其对耐药细胞积聚和外排阿霉素(ADR)的影响，以及对耐药株细胞表达P=gp的影响。结果：复方三根制剂可部分恢复K562／ADR和K562／VCR耐药细胞对ADR的敏感性，而对VCR抗药性的逆转作用不明显；可增加K562／ADR和K562／VCR耐药细胞内ADR的积聚，并对外排ADR有一定影响；可部分下调p-gp的表达。结论：复方三根制剂可部分逆转耐药细胞的抗药性。     

�����������������������������ת���ٰ���ҩ��ҩ����������

??OBJECTIVE To prepare a redox and pH dual sensitive nano-carrier based on PAMAM in order to co-loading chemotherapeutics doxorubicin and breast cancer multidrug resistance reversal agent elacridar, and study their in vitro reversal effect. METHODS The infrared spectrum FTIR was used to characterize the carrier. Confocal was used to investigate the intracellular triggered drug release. The reversal effect of breast cancer multidrug resistance and the in vitro anti-tumor activity of doxorubicin and elacridar co-loaded nanoparticles were investigated using flow cytometry and cell toxicity tests, respectively. RESULTS The doxorubicin and elacridar co-loaded nanoparticles (PSSP/DOX/ELC) were successfully prepared, and pH-redox dual sensitive of carrier was proved by cell experiments.And the carrier was uptaken into cells and delivery to lysosome, and drug release was triggered in the lysosome acid condition, then the released drug diffused to the nucleus. The trial of rhodamine 123 accumulation and efflux assay revealed that the accumulation of rhodamine 123 was notably increased after incubation of elacridar in MCF-7/ADR cells. The cytotoxicity of PSSP/DOX/ELC nanoparticles against MCF-7/ADR cell line was significantly stronger than that of either free doxorubicin or only doxorubicin loaded nanoparticles (PSSP/DOX). CONCLUSION The reversal effect of multidrug resistance and the cytotoxicity of cancer cells were significantly enhanced by PSSP/DOX/ELC nanoparticles. PSSP/DOX/ELC nanoparticles is a promising delivery system.     

黄连解毒汤中黄酮成分逆转 K562/ADM多药耐药的实验观察

目的:观察黄连解毒汤中黄酮成分逆转肿瘤多药耐药的作用,探讨本方逆转肿瘤多药耐药的物质基础。方法:以人慢性粒细胞白血病红白血病细胞株K562的耐阿霉素(adriamycin,ADM)细胞株(K562/ADM)为细胞系,通过MTT实验观察黄芩苷、京尼平苷对K562/ADM细胞ADM的敏感性的影响,计算细胞增殖抑制率、半数抑制浓度(IC50)及耐药逆转倍数,并对细胞内ADM浓度变化进行测定。结果:黄芩苷、京尼平苷均能部分逆转K562/ADM细胞。黄芩苷、京尼平苷的IC50值分别为5.06,6.74 mg.L-1。黄芩苷、京尼平苷的耐药逆转倍数分别为1.95,1.46倍。与相应的对照组相比,K562/ADM细胞经黄芩苷(50 mg.L-1)、京尼平苷(100 mg.L-1)作用后,细胞内ADM的荧光强度高于对照组,其中黄芩苷组提高到3.6%,京尼平苷组提高到1.7%。结论:黄连解毒汤逆转肿瘤多药耐药的物质基础可能与其含有的黄芩苷、京尼平苷有关。     

��-����������ȫ��ʽά������ת�˰�Ѫ��ϸ��K562/ADM��ҩ�Ե��о�

??OBJECTIVE To investigate the effects of interferon-??(IFN-??) and all-trans retinoic acid(ATRA) on multidrug resistance reversal effect and mechanism of human leukemia K562/ADM cells. METHODS The cytotoxicity and reversal times of IFN-?? and ATRA were detected by CCK-8 method. Apoptosis rate and cell cycle were detected by flow cytometry. PI3K, Akt and Bad mRNA were detected by RT-PCR method. Western blot method was used to detect the expression of PI3K, AKt, P-AKt and Bad protein.RESULTS The drug resistance of K562/ADM cells to adriamycin(ADM) was 54 times. ADM, respectively, with IFN-??, ATRA or combined application, the drug resistance of K562/ADM cells to ADM was 1.24, 2.34 and 8.14, respectively. The apoptosis rate of K562/ADM cells was significantly increased by using ADM 4 mg??L^-1alone or in combination with IFN-?? 2.5??10⁶ U??L^-1, ATRA 7.5 ??mol??L^-1, and the cell cycle was blocked in G₀/G₁ phase. PI3K mRNA and protein expression were significantly lowered, Akt mRNA and protein has no obvious change, Bad mRNA and protein expression are raised, phosphorylated Akt protein expression decreased, the expression is more obvious when the two drug combination. CONCLUSION IFN-?? and ATRA can reverse the multidrug resistance of K562/ADM cells, its mechanism may be the inhibition of the PI3K/Akt pathway.     

复方藤梨根制剂对K562/ADM多药耐药作用的体内实验研究

目的：研究复方藤梨根制剂逆转人红白血病耐药细胞株K562/ADM裸鼠移植瘤的多药耐药效应及机制。方法：建立K562/ADM裸鼠移植瘤多药耐药模型;以流式细胞仪（FCM）检测各组肿瘤细胞膜上P-gp的表达和肿瘤细胞内ADM蓄积浓度。结果：（1）ADM组P-gp的表达与NS组相比明显升高（P（0.05）;不同剂量的FFTLG制剂与ADM合用时,P-gp的表达与ADM组相比显著下降（P（0.01）。单独应用FFTLG制剂,当浓度为0.8mg/mL时P-gp的表达与ADM组相比下降（P（0.05）。（2）与ADM组相比,ADM和不同剂量的FFTLG合用组肿瘤细胞内的ADM浓度均有上升（P（0.05）。结论：FFTLG制剂可以部分逆转荷瘤裸鼠的多药耐药性,其逆转效果似呈剂量依赖性。FFTLG制剂逆转荷瘤裸鼠多药耐药性的机理之一是通过下调肿瘤细胞膜上P-gp的表达或抑制P-gp的活性,增加肿瘤细胞内ADM的蓄积浓度而实现的。     

四物合剂对人红白血病细胞株K562/ADM多药耐药性的逆转作用研究

目的 :观察四物合剂对人红白血病细胞株K5 62 /ADM多药耐药性的逆转作用。方法 :以维拉帕米为阳性对照 ,MTT法观察耐药细胞株K5 62 /ADM的耐药倍数及四物合剂的逆转倍数 ;采用反相高效液相色谱法 (RP-HPLC)检测细胞内的ADM浓度 ;免疫荧光法测定细胞膜P-糖蛋白 (Pgp)表达。结果 :四物合剂和ADM合用时 ,对K562/ADM耐药性的逆转倍数及细胞内的ADM含量比ADM单独使用时明显增高 (P<0.01);但对K562/ADM细胞膜Pgp表达的影响差异不显著 (P>0.05)。结论 :四物合剂在无毒性剂量时能逆转细胞株K562/ADM对ADM的耐药性 ,但对细胞膜Pgp表达影响不大 ,其逆转作用可能与降低Pgp药物外排作用、增加细胞内药物浓度有关。