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片仔癀对人骨肉瘤阿霉素耐药细胞的作用及机制探讨
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摘要
目的
     本实验以人骨肉瘤U20S细胞经ADM诱导建立的骨肉瘤ADM耐药细胞和相应的耐药细胞裸鼠移植瘤模型为研究对象,观察片仔癀对人骨肉瘤ADM耐药细胞的作用并探讨其可能的机制,为临床应用片仔癀逆转骨肉瘤耐药提供实验依据。
     方法
     1、人骨肉瘤U20S细胞ADM耐药细胞株的建立及其耐药机制
     采用大剂量间隙作用、浓度梯度递增间隙作用建立人骨肉瘤U20S细胞ADM耐药株分别命名为U2OS/ADM1、U2OS/ADM2,光镜及透射电镜下观察细胞形态变化;MTT法绘制生长曲线计算倍增时间,测定其耐药指数及药物敏感性;FCM检测细胞内Rh123蓄积情况;RT-PCR检测MDR1、MRP1及Survivin mRNA的表达;Western blot检测P-gp、MRP1及Survivin蛋白的表达。
     2、片仔癀对人骨肉瘤U2OS/ADM2细胞的作用
     采用MTT法确定无细胞毒作用的片仔癀IC10浓度为联用浓度,MTT检测片仔癀、无细胞毒作用浓度的片仔癀与ADM联用对U2OS/ADM2细胞增殖的影响,利用金氏公式求Q值,进行合用效果判断;Hoechst33258染色、Annexin V-FITC/PI双染FCM检测片仔癀、无细胞毒作用浓度的片仔癀与ADM联用对U2OS/ADM2细胞凋亡的影响。
     3、片仔癀逆转人骨肉瘤U2OS/ADM2细胞耐药的机制
     采用FCM检测片仔癀对U2OS/ADM2细胞内Rh123蓄积的影响、无细胞毒作用浓度的片仔癀与ADM联用对U2OS/ADM2细胞内ADM蓄积的影响;RT-PCR检测不同浓度片仔癀、无细胞毒作用浓度的片仔癀与ADM联用对U2OS/ADM2细胞Bcl-2、Bax. Survivin、MDR1mRNA表达的影响;Western blot去检测Bcl-2-、Bax、Survivin、P-gp蛋白的表达。
     4、片仔癀对人骨肉瘤U2OS/ADM2细胞裸鼠移植瘤的作用
     采用人骨肉瘤耐药株U2OS/ADM2细胞构建裸鼠皮下移植瘤模型,观察片仔癀、ADM、片仔癀与ADM联用对U2OS/ADM2细胞裸鼠移植瘤体积、重量的影响,绘制肿瘤生长曲线,计算肿瘤抑制率(IR),TUNEL法检测移植瘤细胞凋亡情况,RT-PCR检测Bcl-2、Bax、MDR1mRNA在移植瘤中的表达。
     结果
     1、成功建立了人骨肉瘤U20S细胞ADM耐药株U2OS/ADM1、U2OS/ADM2,镜下观察U2OS/ADM1、U2OS/ADM2细胞较亲本细胞U2OS在形态上发生了显著变化,透射电镜观察发现耐药株细胞内空泡增多,核糖体增多,粗面内质网扩张;U2OS/ADM1与U2OS/ADM2细胞倍增时间延长,与U2OS细胞相比差异明显(PF)<0.01);U2OS/ADMK、U2OS/ADM2细胞的耐药指数(RI)分别为79.63和91.06,同时对紫杉醇、顺铂交叉耐药;细胞内Rh123蓄积量明显低于U2OS细胞(P<0.01),而两种耐药株对Rh123的蓄积无明显差异(P>0.05);U2OS/ADM1、U2OS/ADM2细胞中MDR1/P-gp、MRP1及Survivin基因及蛋白的表达均明显高于U2OS细胞(P<0.05),且U2OS/ADM2细胞中MRP1的表达较U2OS/ADM1细胞明显上调(P<0.05)。
     2、片仔癀对U2OS/ADM2细胞增殖具有抑制作用,呈时间和剂量依赖性;片仔癀可促进U2OS/ADM2细胞凋亡,凋亡率随片仔癀浓度的增大而增加;U2OS细胞和U2OS/ADM2细胞对片仔癀的IC50无明显差异(P>0.05),U2OS/ADM2细胞对片仔癀无交叉耐药性。片仔癀对U2OS/ADM2细胞无毒性作用的药物浓度(IC10)为0.4mg/ml。 U2OS/ADM2细胞对ADM的IC50为(14.57±0.15)μg/ml,0.4mg/ml片仔癀与ADM联用后其对ADM的IC50为(6.75±0.29)μ g/ml,逆转指数为2.16;Q值为2.29;0.4mg/ml片仔癀与ADM联用后细胞凋亡率与单用ADM相比明显增加(P<0.05)。
     3、片仔癀可增加细胞内P-gp底物Rh123的蓄积,下调U2OS/ADM2细胞中Bcl-2、Survivin、MDR1/P-gp的表达,上调Bax表达,且呈剂量依赖性,与对照组相比有明显差异(P<0.05);0.4mg/ml片仔癀与ADM联用后细胞内ADM荧光强度为对照组的1.27倍(P<0.05),与对照组、单用ADM组相比,联用组Bcl-2、Survivin、MDR1/P-gp的表达下调,而Bax的表达上调,差异具有统计学意义(P<0.05)。
     4、成功建立了U2OS/ADN2细胞裸鼠移植瘤模型,片仔癀与ADM联用组裸鼠移植瘤的体积、重量与片仔癀组、ADM组相比明显降低(P<0.05)。TUNEL检测显示联用组凋亡指数明显高于片仔癀组、ADM组,差异有统计学意义(P<0.01)。RT-PCR结果显示片仔癀与ADM联用可明显上调Bax mRNA的表达,降低Bcl-2、MDR1mRNA的表达,与单用片仔癀和单用ADM相比差异具有统计学意义(P<0.05)。
     结论
     1、采用ADM大剂量间隙作用、浓度梯度递增间隙作用法均可建立人骨肉瘤ADM耐药细胞株,耐药机制与MDR1、MRP1、Survivin过表达有关;不同建立方式存在一定差异,浓度梯度递增间隙作用法建立的耐药细胞耐药性更明显。
     2、片仔癀能够有效抑制U2OS/ADM2细胞的增殖,促进其凋亡,呈时间和剂量依赖性;无细胞毒作用的片仔癀与ADM可产生协同作用,提高U2OS/ADM2细胞对ADM的敏感性,表明片仔癀具有逆转U2OS/ADM2细胞耐药的作用。其机制与抑制P-gp的表达,改变Bcl-2与Bax的比例,下调Survivin的表达有关。
     3、片仔癀与ADM联用可明显抑制U2OS/ADM2细胞裸鼠移植瘤的生长,促进其凋亡,其机制与上调Bax表达,下调Bcl-2、MDR1的表达有关。
Objective
     Using human osteosarcoma adriamycin resistant U20S/ADM cells and the corresponding animal model for the study, to evaluate the effects of Pien Tze Huang on U2OS/ADM2cells and the associated mechanisms, to provide experimental basis for Pien Tze Huang to reverse osteosarcoma drug-resistance in clinical.
     Methods
     1. Establishment of an adriamycin resistant human osteosarcoma U2OS/ADM cells and explore its drug resistance mechanism.
     Two resistant cell lines U20S/ADM1and U2OS/ADM2were established by impacting with high dose of adriamycin for short time and gradually increasing concentration of adriamycin from the parent cell line U2OS in vitro, observed their morphological features by optical microscope and transmission electron microscope, checked their resistance index (RI) and drug sensitivity by MTT assay, gathered their growth curve and calculated their doubling time. The accumulation of Rh123was evaluated by flow cytometry. Expressions of MDR1/P-gp、MRP1and Survivin were measured quantitatively by RT-PCR and Western blot.
     2. Study of reversal effects of Pien Tze Huang (PZH) on U2OS/ADM2cells
     PZH alone or combined with adriamycin were used to treated U2OS/ADM2cells, the growth inhibitions were detected by MTT assays, the combination effect of PZH with ADM on U2OS/ADM2cells was calculated by index Q and reversal index; the apoptosis was detected by Hoechst33258staining assay and Annexin V-FITC/PI double staining analysis by flow cytometry.
     3. Study of the reversal mechanisms of PZH on U2OS/ADM2cells
     PZH alone or combined with adriamycin were used to treated U2OS/ADM2cells, the accumulation of Rh123or ADM was evaluated by flow cytometry. Expressions of Bcl-2、 Bax、Survivin and MDRl/P-gp were studied by RT-PCR and Western blot.
     4. Study on the reversal effects of PZH on U2OS/ADM xenograft in nude mice
     The nude mice modes were built by injecting U2OS/ADM2cells in nude mice subcutaneous. PZH or ADM or PZH combined with adriamycin were used to treated the nude mice. Tumors volume and tumors weight were measured during the drug therapy, the growth curve was gathered and tumor volume and weight inhibition rate were calculated. The apoptosis was detected by In situ end labeling (TUNEL) and the expressions of Bcl-2、Bax、 MDR1mRNA were measured by RT-PCR.
     Result
     1. The RI of U2OS/ADM1and U2OS/ADM2cells were79.63and91.06to adriamycin. They also demonstrated cross resistance to paclitaxel and cisplatin. Both resistant cell lines grew slowly, their doubling time were prolonged (P<0.01,vs U2OS cells) and exhibited changes in morphology. The accumulation of Rh123was lower in two resistant cell lines than in the parent cells (P<0.01, vs U2OS cells). The expressions of MDR1, MRP1and Survivin were enhanced in both resistant cell lines (P<0.05, vs U2OS cells). The expression of MRP1was higher in U2OS/ADM2cells than in U2OS/ADM1cells (P<0.05).
     2. The IC50value of PZH has no significant difference on the U2OS cells and U2OS/ADM2cells, indicating that drug resistant U2OS/ADM2cells have no cross-resistance to PZH. The proliferation of U2OS/ADM2cells was inhibited by PZH in a dose-time-dependent manner. The IC10of PZH to U2OS/ADM2cells is0.4mg/ml. The U2OS/ADM cells growth inhibition rate was significantly increased compared the combined effect of0.4mg/ml PZH and ADM with PZH and ADM separately. The IC50value of ADM in U2OS/ADM cells was (14.57±0.15)μg/ml, it decreased to (6.75±0.29)μg/ml after combined with PZH, the reverse index is2.16, the combined index Q was2.29>1.15. The percentage of U2OS/ADM2cells apoptosis were significantly increased by PZH in a dose-dependent manner. Cooperated the apoptosis rate of PZH and ADM with PZH and ADM separately, the combination of PZH and ADM significantly increased (P<0.05)
     3. PZH attenuated the expressions of Bcl-2, Survivin and MDR1/P-gp, activated the expression of Bax at mRNA and protein levels, enhanced the accumulation of Rh123in U2OS/ADM2cells in a does-dependent manner (P<0.05, vs control). The fluorescence intensity of ADM in U2OS/ADM2cells treated by0.4mg/ml PZH combined with ADM was increased1.27times compared by AMD. The mRNA and protein expressions of Bcl-2、 Survivin and MDRl/P-gp were downregulated and the mRNA and protein expression of Bax was upregulated in0.4mg/ml PZH combined with ADM group (P<0.05, vs. control)
     4. The tumor models of human osteosarcoma U2OS/ADM2cells xenograft were successfully constructed. Compared the combined effect of PZH and ADM group with PZH and ADM group separately, volume and weight of U2OS/ADM2cells xenograft were significantly decreased (P<0.05), the apoptotic index was increased detected by TUNEL assay (P<0.01). RT-PCR results showed that the mRNA expression level of Bcl-2and MDR1were downregulated and the mRNA expression level of Bax was upregulated in the PZH and ADM group, compared to the PZH group and ADM group (P<0.05)
     Conclusion
     1. Using high dose of adriamycin for short time and gradually increasing concentration of adriamycin from the parent cell line U2OS in vitro can establishment the adriamycin resistant human osteosarcoma cell lines U2OS/ADM1and U2OS/ADM2, the drug-resistance mechanisms maybe relate to overexpressions of MDR1/P-gp, MRP1and Survivin. The resistant ability of U2OS/ADM2cells was higher than U2OS/ADM1cells.
     2. PZH can inhibit the growth of U2OS/ADM2cells and promote apoptosis in time and dose-dependent manner, and PZH has a synergistic effect with ADM, increase the sensitivity of U2OS/ADM2cells to ADM. The mechanism is related to inhibit the expression of P-gp, change the proportion of Bcl-2and Bax, and down regulate the expression of Survivin.
     3. PZH can enhance the anti-tumor effect of ADM on U2OS/ADM2cells xenograft, the mechanism is related to downregulate the expressions of Bcl-2and MDR1gene and upregulate the expression of Bax gene.
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