摘要
目的观察载小干扰RNA(siRNAs)纳米微粒沉默B细胞淋巴瘤/白血病-2(bel-2)基因联合纳米砷剂协同抗急性髓性白血病效应。方法凝胶阻滞电泳、荧光显微镜、流式细胞仪及噻唑蓝(MTF)法分别用于评估正聚乙二醇(PEG)-多聚赖氨酸(PLL)负载siRNAs能力、细胞转染效率及对细胞活力影响,Western blot法观察siRNAs沉默靶基因,MTT法评估siRNAs联合纳米砷剂对U937协同抑制效应。结果N/P=10时,PEG—PLL和siRNAs基本复合,U937细胞活力为(85.06±5.80)%,转染效率为(83.70±0.37)%,转染后bcl-2蛋白表达下降为(44.11±4.39)%。空载体、纯砷单药、纳米As单药及联合用药组纠胞活力分别为(99.44±1.45)%、(87.76±2.21)%、(92.98±4.34)%、(67.93±8.16)%(P〈0.05)(砷1.25μmol/L);(99.56±2.53)%、(54.08±4.46)%、(57.85±2.11)%、(38.60±6.24)%(P〈0.05)(砷2.50μmol/L);(98.88±1.59)%、(37.62±1.38)%、(51.31±3.14)%、(28.92±4.97)%(P〈0.05)(砷5.00μmol/L);(97.72±2.55)%、(29.44±4.14)%、(40.18±3.72)%、(20.56±4.97)%(P〈0.05)(砷10.00μmol/L);(96.65±2.03)%、(21.49±1.60)%、(26.34±0.97)%、(15.90±1.70)%(P〈0.05)(砷20.00μmol/L)。结论PEG—PLL对U937细胞毒性较低、转染效率较高,PEG—PLL/siRNAs沉默bcl-2联合纳米As获得协同抗白血病效应。
Objective To observed the synergetic inhibitory effects on human acute myelogenous leukemia (AML) by nanoparticle-mediated small interfering RNA (siRNAs) and arsenic therapy in vitro. Methods Gel retardation assay, fluorescence microscopy, flow cytometry assay and methyl thiazol tetrazo- lium (MTT) assay was performed to evaluate siRNAs complexation capacity, transfection efficiency and influence on cell viability of polyethylene glycol (PEG)-poly (L-lysine) (PLL). The down regulation of B cell lymphoma/leukemia-2 (bcl-2) gcne expression was comfirmed by Western blotting assay. The MTr assay was further performed to evaluate the synergetic inhibitory effects on U937 cells by siRNAs and arsenic nanoparticles. Results At N/P ratio of 10, PEG-PLL and siRNAs complexed completely, the cell viability was ( 85.06 ± 5.80 ) %, the transfection efficiency was ( 83.70 ± 0. 37 ) %, and the siRNAs knocked down bcl-2 protein expression up to (44. 11 ± 4. 39)%. When bcl-2 targeted siRNAs was combined with As for the therapy, the enhanced cytotoxicity on U937 cells was observed. The cell viabilities of bPDLLA-, As-sol-, As-NPs-and si + As-NPs-treated group were (99. 44 ±1.45 ) %, (87. 76 ± 2. 21 ) %, (92.98±4.34)%, (67.93±8.16)% (As 1.25 μmol/L, P〈0.05). (99.56±2.53)%, (54.08± 4.46)%, (57.85 ±2.11)%, (38.60±6.24)% (As 2.50 μmol/L, P〈0.05). (98.88±1.59)%, (37.62±1.38)%, (51.31 ±3.14)%, (28.92 ±4.97)% (As 5.00 μmol/L, P〈0.05). (97.72± 2.55)%, (29.44 ±4. 14)%, (40. 18 ±3.72)%, (20.56 ±4.97)% (As 10.00 μmol/L, P〈0.05) and (96.65 ±2.03)%, (21.49±1.60)%, (26.34 ±0.97)%, (15.90 ±1.70)% (As 20.00 μmoL/L, P 〈 0. 05 ). Conclusion PEG-PLL was charaterized potent siRNAs complexation capacity, low cytotoxicity and high transfection efficiency. Combination of bcl-2 gene silencing and As delivery using nanoparticles exerted enhanced cytotoxicity on U937 ceils.
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2014年第5期1101-1104,共4页
Chinese Journal of Experimental Surgery
基金
国家自然科学基金资助项目(81072045、81302140)
广东省产学研资助项目(2009/3090300277)
珠海市科技计划资助项目(2013D0401990026)