米托蒽醌聚乳酸纳米粒的制备和细胞摄取研究
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摘要
本课题制备了米托蒽醌聚乳酸纳米粒(DHAQ-PLA-NP),并用Dextran 70包裹,目的在于提高米托蒽醌(mitoxantrone, DHAQ)的疗效,降低其毒副作用,增加靶细胞的摄取。以人肝癌细胞SMMC-7721和人肝正常细胞L02为模型,探讨DHAQ和DHAQ-PLA-NP的细胞毒性,并评价两种细胞对DHAQ. DHAQ-PLA-NP和Dextran 70包裹DHAQ-PLA-NP的摄取特性,为DHAQ-PLA-NP进一步用于肝癌的临床治疗提供实验依据。
     本文首先采用沉淀法制备DHAQ-PLA-NP,对制备工艺与处方中有机溶剂的比例,表面活性剂的浓度等影响因素进行筛选,得到优化的制备工艺和参数。制备的纳米粒粒径在150 nm左右,PDI值在0.1到0.3之间,电位在-40 mv左右。用乳糖作为冻干保护剂制得的DHAQ-PLA-NP冻干针剂外型美观,含量稳定。结果表明,优化的方法以制备出包封率和载药量均较高的纳米粒,并具有粒径分布均匀,冻干效果良好等特点。
     为了降低药物对肝正常细胞的毒性和考察DHAQ-PLA-NP对肝癌化疗的效果,我们采用MTT法进行定量分析,研究DHAQ和DHAQ-PLA-NP对人肝癌细胞SMMC-7721和人肝正常细胞L02的毒性。结果显示,DHAQ和DHAQ-PLA-NP的杀伤效应呈时间依赖性和剂量依赖性。由于纳米粒具有缓释作用,在相同时间点,其IC5o值大于DHAQ的IC5o值,说明DHAQ制成纳米粒后以减少毒副作用。
     为了增加人肝癌细胞SMMC-7721对DHAQ-PLA-NP的摄取和比较其与人肝正常细胞L02对DHAQ-PLA-NP的摄取量的差别,我们进一步采用Dextran 70包裹的DHAQ-PLA-NP,并建立了HPLC检测细胞样品中DHAQ含量和BCA法测定细胞的蛋白含量的方法。结果表明,低浓度时,DHAQ和DHAQ-PLA-NP的药物摄取量没有差别,但在高浓度时,DHAQ-PLA-NP要显著高于DHAQ,并且用2%Dextran70包裹DHAQ-PLA-NP的摄取量更高. DHAQ-PLA-NP的摄取量高于DHAQ, Dextran70包裹DHAQ-PLA-NP摄取量也高于DHAQ-PLA-NP(P<0.05),说明DHAQ制备成用Dextran70包裹的DHAQ-PLA-NP后更容易被细胞摄取。
In this paper, Mitoxantrone polylactic acid nanoparticles (DHAQ-PLA-NP) and the Dextran 70 coating DHAQ-PLA-NP were prepared. The aims are to enhance the therapeutic efficacy of mitoxantrone in treating, reduce the toxicity and increase the uptake amount. Then, the cytotoxicity of DHAQ and DHAQ-PLA-NP on human hepatoma cells (SMMC-7721) and human normal hepatocyte (LO2) were studied. Finally, the uptake of the original drug, DHAQ-PLA-NP and Dextran 70 coating DHAQ-PLA-NP in these two cells was investigated. The study will provide some available information for liver cancer treatment of DHAQ-PLA-NP in clinic.
     The method of precipitation was employed to prepare DHAQ-PLA-NP. The factors, such as the ratio of organic solvent and surfactant which influence the preparation were investigated, and the techniques were optimized. The size was about 150 nm; the PDI was between 0.1 to 0.3 and the zeta potential was about -40mv. DHAQ-PLA-NP lyophilization injection was prepared by using lactose as protective agent in freeze drying. The product was of good looks and good quality. The results showed that the embedding ratio and drug loading of the nanoparticles were high. The nanoparticles had the characteristic which was the size well-distributed, freeze-dried good effect and so on.
     To reduce the liver toxicity of normal cells and investigate the effect of DHAQ-PLA-NP to liver cancer chemotherapy, the MTT assay was carried out to measure the cytotoxicity of DHAQ and DHAQ-PLA-NP on human hepatoma cells SMMC-7721 and human normal hepatocyte LO2. The results showed that the killing effect of DHAQ and DHAQ-PLA-NP was time- and dose-dependent. It was found that the IC50 of nanoparticles which have slow-releasing property, at the same time, was greater than the IC50 of DHAQ. It was showed that DHAQ-PLA-NP could reduce the toxicity.
     Furthermore, in order to increase the uptake of DHAQ-PLA-NP on human hepatoma cells SMMC-7721 and compare the uptake of DHAQ-PLA-NP between human hepatoma cells SMMC-7721 and human normal hepatocyte LO2, Dextran 70 coating DHAQ-PLA-NP was used and the concentration of mitoxantrone in SMMC-7721 cells and LO2 cells was determined by HPLC and the content of protein in cells by BCA method. The results showed that there was no obvious difference between DHAQ and DHAQ-PLA-NP at lower concentration. However, the uptake amount of DHAQ-PLA-NP was much larger than that of DHAQ at higher concentration and the uptake amount of 2% Dextran 70 coating DHAQ-PLA-NP was the most. The uptake amout of DHAQ-PLA-NP was larger than that of DHAQ and the uptake amout of 2% Dextran 70 coating DHAQ-PLA-NP was also higher than that of DHAQ-PLA-NP (P<0.05). It was showed that the uptake of Dextran 70 coating DHAQ-PLA-NP was more easily by cells.
引文
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