共查询到16条相似文献,搜索用时 171 毫秒
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目的 探讨维生素C联合三氧化二砷(As2O3)对膀胱癌T-24细胞的影响及其机制。方法 体外培养T-24细胞,分为6组,对照组不做处理,实验组分别加入不同浓度的As2O3 (0.4、4、40 μg/ml)组,维生素C(400 μg/ml)组、维生素C(400 μg/ml)+ As2O3 (0.4 μg/ml)组(联合组),采用细胞增殖曲线检测T-24细胞生长差异情况,用流式细胞术检测细胞周期及凋亡率变化,RT-PCR、Western blot技术检测分析caspase-3、survivin mRNA及蛋白的表达情况。结果 联合组、维生素C(400 μg/ml)组、As2O3 (4 μg/ml)组及As2O3 (40 μg/ml)组均对膀胱癌T-24细胞增殖有显著抑制作用;联合组将细胞阻止在G0/G1期,且凋亡率显著高于其他五组(P<0.05);RT-PCR及Western blot结果显示,维生素C(400 μg/ml)组、联合组的caspase-3 mRNA和蛋白表达升高,survivin mRNA和蛋白表达降低。结论 维生素C联合As2O3 可抑制膀胱癌T-24细胞增殖,促进细胞凋亡,其机制可能与上调caspase-3 mRNA、蛋白,下调survivin mRNA、蛋白表达有关。 相似文献
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背景与目的:近年来随着新型药物和免疫疗法的成功应用,多发性骨髓瘤(multiple myeloma,MM)患者的缓解率、缓解深度和无病生存率较以往显著提高,然而仍有相当一部分MM患者属于复发/难治性病例。我们的前期研究发现,环腺苷酸(cyclic adenosine monophosphate,cAMP)拟似物和三氧化二砷(arsenic trioxide,As2O3)可以抑制MM细胞增殖并诱导其凋亡,成为MM治疗的新途径。该研究进一步探究As2O3单独和联合环腺苷酸拟似物8-对氯苯硫基环腺苷酸[8-(4-chlorophenylthio) adenosine 3’, 5’-cyclic monophosphate,8-CPT-cAMP]对MM细胞的影响及可能作用机制。方法:以不同浓度As2O3和8-CPT-cAMP单独和联合处理MM细胞系U266细胞,采用细胞计数试剂盒(cell counting kit-8,CCK-8)检测其增殖,应用药物联合指数(combination index,CI)分析两药是否存在协同效应,同时采用流式细胞术检测细胞周期和凋亡率,进一步利用蛋白质印迹法(Western blot)检测细胞凋亡相关蛋白caspase-3和Bcl-2表达的变化。结果:U266细胞经As2O3和8-CPT-cAMP单独或联合处理72和120 h后,联合用药组细胞增殖抑制率分别为(18.01±0.13)%和(28.01±0.14)%,明显高于单独用药组[As2O3组为(11.35±0.01)%和(16.01±0.14)%,8-CPTcAMP组为(12.26±0.30)%和(15.43±0.23)%,P均<0.05];但两药联合处理U266细胞的CI值均大于1。联合用药组72和120 h后U266细胞凋亡率分别达到(22.26±0.13)%和(31.03±0.14)%,显著高于单药组[As2O3组为(10.06±0.01)%和(12.35±0.14)%,8-CPT-cAMP组为(13.26±0.30)%和(18.76±0.23)%,P均<0.05]。同时联合用药组U266细胞内caspase-3蛋白剪切活化和Bcl-2表达下降。结论:As2O3联合8-CPT-cAMP对MM细胞凋亡诱导效应强于单药,但无协同效应。 相似文献
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目的 研究三氧化二砷(arsenic trioxide,As2O3)联合热疗对大鼠肝脏移植瘤细胞的凋亡、热休克蛋白70(Heat shock protein 70,HSP70)、p53和增殖细胞核抗原(Proliferation cell nuclear antigen,PCNA)表达的影响,探讨其诱导肿瘤细胞凋亡的可能机制。方法 建立大鼠肝脏移植瘤模型,分别对荷瘤大鼠给予生理盐水、As2O3、热疗及As2O3联合热疗,观察肿瘤生长情况,用免疫组化法检测肿瘤细胞凋亡及肿瘤组织中HSP70、p53及PCNA的表达。结果 As2O3 联合热疗的抗肿瘤作用最明显,坏死及凋亡细胞数量增加。对照组HSP70、p53及PCNA阳性细胞表达率分别为30.12%±3.60%,27.64%±4.90%和74.23%±6.35%,三氧化二砷联合热疗组HSP70、p53及PCNA阳性细胞表达率分别为87.4%1±5.70%,90.06%±6.42%和22.10%±6.17%。与对照组(仅给予As2O3或热疗处理)比较,经As2O3联合热疗处理后,HSP70、p53表达显著升高(P=0.000< 0.05),PCNA表达则显著降低(P=0.000 <0.05)。结论 As2O3与热疗联合应用治疗大鼠肝癌有明显的协同作用;As2O3联合热疗通过诱导HSP70及p53的表达和降低PCNA的表达抑制肝癌细胞增殖并促进细胞凋亡。 相似文献
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目的探讨三氧化二砷(As2O3)对食管癌离体肿瘤细胞EC-1的放射增敏作用,并探讨其机制。方法利用多靶单击数学模型拟合放射剂量-细胞存活曲线,观察As2O3对食管癌细胞株EC-1的放射增敏作用。流式细胞法观察As2O3对细胞周期分布及细胞凋亡的影响。结果As2O3对食管癌细胞株EC-1有明显的放射增敏效应,3 μmol/L As2O3作用48 h的放射增敏比为1.285。药物作用后G2/M期细胞比例增加,G0/G1期和S期细胞比例减少;细胞凋亡指数增加,与对照组相比,差异有统计学意义(P<0.05)。结论As2O3对食管癌细胞株EC-1有明显的放射增敏效应。放射增敏的机制可能与As2O3抑制EC-1细胞的修复能力、使细胞周期阻滞在G2/M期、G0/G1期和S期细胞减少以及凋亡增加有关。 相似文献
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Sahara N Takeshita A Kobayashi M Shigeno K Nakamura S Shinjo K Naito K Maekawa M Horii T Ohnishi K Kitamura K Naoe T Hayash H Ohno R 《Leukemia & lymphoma》2004,45(5):987-995
We studied the cytotoxic effect of an organic arsenical compound, phenylarsine oxide (PAO) on an acute promyelocytic leukemia (APL) cell line (NB4) and an As2O3-resistant NB4 subline (NB4/As). Cell growth was inhibited by 50% (IC50) upon 2-day treatment with As2O3 or PAO at 0.54 and 0.06 μM, respectively in NB4 cells (P = 0.025), and 2.80 and 0.08 μM, respectively in NB4/As (P = 0.030). 0.1 μM PAO increased the proportion of hypodiploid cells (50.3%) by a greater degree than the same dose of As2O3 (3.8%) in NB4 cells. In NB4 cells, 0.1 μM PAO reduced the mitochondrial transmembrane potential (20.5% in a PInegative-Rhodamine123low fraction) by a greater degree than 1 μM As2O3 (7.1%). Western blotting showed that 0.1 μM PAO downregulated the expression of both Bcl-2 and Bcl-XL proteins, whereas I μM As2O3 downregulated only Bcl-2 expression. These results suggest that the cytotoxic effect of PAO on an APL cell line and As2O3-resistant subline is significantly higher than that of As2O3. PAO-induced apoptosis seems to be related to the activation of the mitochondrial pathway and downregulation of both Bcl-2 and Bcl-XL. PAO is a considerable agent for relapsed/refractory APL and for purging APL cells following stem cell transplantation. 相似文献
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Arsenic trioxide therapy in acute promyelocytic leukemia and beyond: from bench to bedside 总被引:2,自引:0,他引:2
Arsenic trioxide (As2O3) has a long history of use in medicine. However, it was almost forgotten in Western medicine in the recent centuries. Prompted by reports from China about successful treatment of acute promyelocytic leukemia (APL) with As2O3, there was again increasing interest in this drug in the 1990s. This review summarizes the considerable knowledge about the mechanisms of action of As2O3 that was gained during the last 5 - 10 years. It is focused in particular on the effects of As2O3 in non-APL cells. Since As2O3 seems to induce apoptosis and inhibits growth in a large variety of cellular targets, it might become an alternative or adjunct drug to conventional chemotherapy. As2O3 can even be effective in cells resistant to conventional cytostatic agents. Insight into the cellular mechanisms, in particular the impact of the redox state on sensitivity towards As2O3 opens the possibility to enhance As2O3 effects by appropriate combination therapies. 相似文献
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在急性早幼粒细胞白血病(APL)中,三氧化二砷(As2O3)有效诱导了APL细胞的凋亡,如果能避免早期死亡,多数患者可达到完全缓解和治愈。近几年,人们也研究了它对非APL白血病和多种实体瘤治疗的可能性。同时,越来越多的研究发现,它在体外或体内也抑制非APL白血病和几种实体瘤如肝癌、食管癌和胃癌等细胞的增殖。人们对非APL白血病和实体瘤中As2O3诱导细胞凋亡的机制也进行了研究。并且为取得更满意的疗效和减轻As2O3的细胞毒等副作用,人们对新型As2O3靶向制剂的研发也进行了探索。本文就上述有关研究进展进行综述。 相似文献