尼洛替尼联合5-溴汉防己甲素逆转K562/A02细胞耐药的研究

Objective To investigate the reversible effect of nilotinib,BrTet(5-bromotetrandrine)and their combination on multidrug resistance cell line K562/A02 and its mechanism.Methods Cell proliferation inhibition wag assessed by MTT method and cell apoptosis by flow cytometry(FCM).The expression of mdr1 mRNA was determined by RT-PCR,and the expression of P-gp was assessed by Western blot.Results After 48 h 5 nmol/L nilotinib or 0.5μmol/L BrTet treatment,IC50 of daunorubicin(DNR)to K562/A02 was 4.52 mg/L or 5.41 mg/L respectively;While on combinative treatment,its IC50 decreased to 2.98mg/L.Nilotinib or BrTer alone was not able to increase the DNR induced apoptosis rate of K562/A02 cell (P>0.05),while on combination treatment the apoptosis rate increased remarkably.After 48 h 5 nmol/Lnilotinib or 0.5 μmol/L BrTet treatment alone,gray-scale value of mdr1 mRNA was 0.48±0.04 or 0.64±0.01,respectively;while on combinative treatment the value decreased to 0.35±0.04.The P-gp expression level in K562/A02 cells was 0.61±0.05.or 0.52±0.02 when treated with 5 nmol/L nilotinib or 0.5 μmol/L BrTet alone for 48 h.but on combination treatment,the level decreased to 0.44±0.03.Conclusion Nilotinib or BrTet alone can partially reverse drug resistance of K562/A02 cells.The mechanism may be associated with the decrease of mdr1 mRNA and P-gp expression and increase of the apoptosis rate.And there is a synergistic action with these two agants in combination.     

Effect of hypoxia inducible factor1-α inhibitor on reversal of multidrug resistance of K562/A02 cell line

Objective To study the reversal effect of the hypoxia inducible factor( HIF)-1α inhibitor,YC-1 ,on muitidrug resistance of K562/A02 cells and its mechanism. Methods Pre- and post- incubation with adriamycin (ADM) alone or in combination with YC-1 for 48 h, the proliferation capacity of K562/A02 and K562 cells were evaluated by MTT assay. The apoptosis rate of K562/A02 cells after treated with 0,5,10 and 20 μmol/L YC-1 alone or in combination with 1 mg/L ADM and intracellular ADM concentration were analyzed by flow cytometry(FCM). The mRNA levels of HIF-1α and mdr1 genes were determined by semi-quantitative RT-PCR. The protein levels of HIF-1α and P-glycoprotein (P-gp) were detected by Western blot. Results The IC50 of ADM for K562 and K562/A02 cells were ( 1.56 ± 0.07 ) mg/L and (42.98 ±3.15) mg/L respectively. The resistance of K562/A02 cells to ADM was 27.55- fold higher of that of K562cells. After treatment with YC-1 (5μmol/L, 10μmol/L, 20 μmol/L) for 48h, the resistances of K562/A02cells to ADM were 24.63-, 16.38- and 10.71- fold increase respectively. After treatment of K562/A02 cell with YC-1(0 μmol/L, 5 μmol/L, 10 μmol/L, 20 μmoL/L) alone or in combination with 1 mg/L ADM for 48 h, the apoptotic rates were ( 1.9 ± 0. 9) %, (4.9 ± 0. 9 ) %, ( 5.8 ± 1.1 ) %, and ( 9.3 ± 1.4 ) % and(2.3 ± 0.7 ) %, (8.2 ± 1.2) %, ( 19.0 ± 1.7 ) %, and ( 34.5 ± 2.4 ) % respectively. The intracellular flucorescence intensity of ADM were 232 ±33, 1300 ±219, 1961 ±240 and 3342 ±269 in the combined treatment group. With the increase in YC-1 concentration, the levels of mdr1 mRNA reduced, while that ofHIF-1α mRNA had no obvious change.Furthermore.the expressions of HIF-1α and P-gp were also decreased in K562/A02 cells.Conclusion YC-1,as a HIF-1 inhibitor,cau reverse multidrug resistance of K562/A02cells through down-regulating HIF-1α and p-gp.     

葡萄糖神经酰胺合成酶抑制剂PDMP对K562/A02细胞柔红霉素耐药逆转的研究

本研究旨在探讨葡萄糖神经酰胺合成酶(glucosylceramide synthase,GCS)抑制剂D,L-threo-1-phenyl-2-decanoylamino-3-morpholino-1-propanol(PDMP)hydrochloride对K562/A02细胞株柔红霉素(daunorubicin,DNR)耐药的逆转作用及其逆转机制。采用四甲基偶氮唑蓝(MTT)法检测不同浓度PDMP对K562细胞和K562/A02细胞的增殖抑制效应及其对K562/A02细胞DNR耐药逆转作用;用流式细胞术检测PDMP对K562/A02细胞内DNR浓度及细胞凋亡率的影响;半定量RT-PCR和Western blot方法检测K562及K562/A02细胞mdr1、GCS基因的表达以及PDMP对K562/A02细胞两种基因表达的影响。结果表明:DNR对K562和K562/A02细胞的IC50分别为0.23±0.02和7.15±0.24μg/ml,当PDMP≤20μmol/L时,对K562及K562/A02细胞株无明显生长抑制作用;20μmol/L和10μmol/L PDMP均能增加K562/A02细胞对DNR的敏感性,其耐药逆转倍数分别为2.59和1.69;两种浓度PDMP作用于耐药株48小时后能增加细胞内DNR浓度(p0.05)和细胞凋亡率(p0.01)。20μmol/L PDMP处理K562/A02细胞48小时后可在mRNA和蛋白水平下调GCS和mdr1基因的表达(p0.01)。结论:PDMP可以增强K562/A02细胞对DNR的敏感性,其机制可能与增加细胞内药物浓度及细胞凋亡率、下调GCS和mdr1基因表达有关。     

略论毛泽东德育思想及其继承与发展

略论毛泽东德育思想及其继承与发展程坚（社科部思政室）关键词毛泽东，德育思想在毛泽东教育思想体系中，德育是其重要组成部分。毛泽东在领导中国革命的过程中十分重视教育，且亲身教育实践；在其实践中十分重视德育。因此，毛泽东德育思想；是和中国教育实践紧密联系在...     

肩关节疾病的鉴别

我们一说到肩关节疾病首先想到的就是肩周炎、肩关节脱位、肩关节损伤等,看着似乎挺好区分.其实,我们在医学上有着比较严谨的分类及鉴别,因为不同的肩关节疾病发病的原因不一样,发病后的表现不一样,预防的措施不一样,发病后的治疗不一样,治疗的效果不一样.     

环孢菌素A、汉防己甲素及两者联合逆转K562／A02细胞的多药耐药

目的：探讨环孢菌素A（CsA）、汉防己甲素（Tet）及两者联合应用对人白血病耐药细胞系K562／A02多药耐药的逆转作用。方法：采用M1Tr法测定柔红霉素（DNR）对细胞的半数抑制量（IC50），流式细胞仪检测细胞凋亡率和细胞内DNR浓度。结果：DNR对K562细胞和K562／A02细胞IC50分别为0．27和21．22mg·L^-1；CsA（1mg·L^-1）及Tet（0．1mg·L^-1）单独和联合处理K562／A02后，DNR的IC50分别为7．83、5．32和2．32mg·L^-1；CsA和Tet对DNR作用K562的IC50无明显影响；K562／A02细胞48h凋亡率为2．19％，DNR（1mg·L^-1）作用K562／A02细胞凋亡率为2．70％，CsA和Tet单独及联合处理后凋亡率分别为10．27％、17．64％和52．79％；两药处理后细胞内化疗药物DNR浓度亦明显增加。结论：CsA及Tet均可逆转耐药，且联合作用逆转效果更强。     

异搏定对非p—gp高表达细胞株的增敏及耐药逆转作用

目的：观察异搏定对非ｐ－ｇｐ高表达细胞株的增敏及耐药逆转作用。方法：使用二甲氧唑黄比色法（ＸＴＴ法）检测药物敏感性，观察Ｖｅｒ对鬼臼乙叉甙的增敏及耐药逆转作用。     

丹红注射液治疗不稳定型心绞痛42例

目的:观察中药注射液治疗不稳定型心绞痛的疗效。方法:治疗组在常规的基础治疗上加用丹红注射液治疗,对照组常规治疗。结果:心绞痛治疗组总有效率为95.2%,对照组总有效率为82.5%;心电图治疗组总有效率为85.7%,对照组总有效率为65%。提示:加用丹红注射液治疗较常规治疗有更好疗效。     

p16基因在K562/A02细胞株表达情况的研究

目的:研究p16基因在K562/A02细胞株的表达情况及其与耐药的关系。方法:用PCR法对慢性髓系白血病细胞株K562及其耐药细胞株K562/A02进行p16基因缺失检测。结果:K562及K562/A02细胞株经PCR扩增后,均未扩出相应条带。结论:K562/A02细胞株与K562细胞株一样,均表现为p16基因缺失。