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聚乙二醇-二硬脂酰磷脂酰乙醇胺修饰的阿霉素隐形脂质体及其在小鼠体内的组织分布和抗肿瘤活性研究

吕万良, 魏树礼, 张强, 齐宪荣, 孙华东   

  1. 北京大学药学院药剂系, 北京 100083
  • 收稿日期:2000-04-26 修回日期:2000-07-24 出版日期:2000-12-15 发布日期:2000-12-15

Doxorubicin Stealth Liposomes Prepared with PEG-Distearoyl Phosphatidylethanolamine and Distribution as well as Antitumor Activity in Mice

Lu Wanliang, Wei Shuli, Zhang Qiang, Qi Xianrong, Sun Huadong   

  1. Department of Pharmaceutics, School of Pharmaceutical Sciences, Peking University, Beijing 100083
  • Received:2000-04-26 Revised:2000-07-24 Online:2000-12-15 Published:2000-12-15

摘要: 目的: 研制出能够逃避体内网状内皮细胞吞噬的阿霉素隐形脂质体, 并考察其在生物体内的分布以及比较阿霉素隐形脂质体与阿霉素普通脂质体的抗肿瘤活性。方法: 将聚乙二醇-二硬脂酰磷脂酰乙醇胺(PEG-DSPE)同磷脂酰胆碱和胆固醇材料加在一起, 用硫酸铵梯度法制备阿霉素隐形脂质体, 同法制备阿霉素普通脂质体(但脂膜中不含PEG-DSPE); 通过尾静脉注射给药, 比较隐形脂质体阿霉素、普通脂质体阿霉素和游离型阿霉素(盐酸阿霉素注射液)给药后在小鼠各主要脏器组织和血液中的分布情况; 采用动物移植性肿瘤实验法, H22小鼠肝癌细胞接种于小鼠右侧腋皮下形成实体瘤, 考察阿霉素隐形脂质体和普通脂质体给药后对实体瘤的瘤重抑制率。结果: 通过硫酸铵梯度法制备出了包封率高达95%的阿霉素隐形脂质体; 同游离型阿霉素和普通脂质体阿霉素相比, 隐形脂质体阿霉素在血液中浓度显著提高, 循环时间显著延长, 在心脏中分布的浓度显著降低; 5 mg·kg-1剂量治疗, 第二天给药和第七天给药治疗方案, 阿霉素隐形脂质体给药组的瘤重抑制率均显著高于普通脂质体给药组的瘤重抑制率; 10 mg·kg-1剂量治疗, 隐形脂质体给药组的瘤重抑制率比普通脂质体给药组的瘤重抑制率稍高。结论: 同普通脂质体给药组相比, 隐形脂质体阿霉素给药后延长了其在小鼠血液中的循环时间, 说明经过PEG-DSPE修饰后的脂质体有逃避网状内皮细胞吞噬的功能(隐形), 并且隐形脂质体阿霉素的抗肿瘤活性显著地提高。

关键词: 阿霉素, 隐形脂质体, HPLC, 组织分布, 抗肿瘤, 小鼠

Abstract: The stealth liposomal doxorubicin and regular liposomal doxorubicin were prepared with and without polyethylene glycol-distearoylphosphatidylethanolamine (PEG2000-DSPE) by the method of ammonium sulfate gradient, respectively. A reversed HPLC-UV method was established to determine the concentrations of doxorubicin in mice tissues after administration. The tissue distribution of stealth liposomal, regular liposomal and free doxorubicin (doxorubicin hydrochloride solution) in mice and pharmacokinetics were investigated. The results showed that the distribution and pharmacokinetics of stealth liposomal doxorubicin in mice were pronouncedly changed as compared with regular liposomal doxorubicin and free doxorubicin. The levels of liposomal doxorubincin in the heart tissues were reduced and those of in the blood increased, especially of stealth liposomal doxorubicin. In evaluation of antitumor activity, the differences between stealth liposomal doxorubicin and regular liposomal doxorubicin were that the inhibition rate of solid tumor weight for stealth liposomal doxorubicin was higher than that of regular liposomal doxorubicin. It is concluded that the PEG ylation of liposomes can pronouncedly prolong the circulation time of doxorubicin in mice blood and increase the antitumor activity.

Key words: Doxorubicin, Doxorubicin, Liposomes, Liposomes, HPLC-UV, HPLC-UV, Ttissue distribution, Ttissue distribution, Antitumor, Antitumor, Mice, Mice

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