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正常大鼠静脉注射PEG包裹胰岛素脂质体的降血糖作用

张煊, 张华, 王桂玲, 张大卫, 王静, 蔺伟, 张强*   

  1. 北京大学药学院药剂学系, 北京 100083
  • 收稿日期:2003-07-26 修回日期:2004-02-10 出版日期:2004-03-15 发布日期:2004-03-15
  • 通讯作者: 张强*

Hypoglycemic Effect of Intravenous Polyethylene Glycol-Coated Liposomal Insulin on Normal Rats

ZHANG Xuan, ZHANG Hua, WANG Gui-ling, ZHANG Da-wei, WANG Jing, LIN Wei, ZHANG Qiang*   

  1. Department of Pharmaceutics, School of Pharmaceutical Sciences, Peking University, Beijing 100083, China
  • Received:2003-07-26 Revised:2004-02-10 Online:2004-03-15 Published:2004-03-15
  • Contact: ZHANG Qiang*

摘要: 目的 以胰岛素为模型药物, 评价PEG包裹胰岛素脂质体的降血糖药效学作用. 方法 采用逆相蒸发法制备PEG包裹的胰岛素脂质体. 正常Wistar大鼠分别静脉注射给予胰岛素溶液、胰岛素脂质体及PEG包裹的胰岛素脂质体. 采用葡萄糖还原酶法测定血清中的血糖浓度. 以梯形法计算血糖-时间曲线上面积(AAC), 采用胰岛素溶液的AAC为对照, 分别计算胰岛素脂质体和PEG包裹的胰岛素脂质体的药理相对生物利用度. 结果 PEG包裹的胰岛素脂质体的包封率为18.33%, 平均粒径为58.4 nm. 静脉注射给予胰岛素溶液、胰岛素脂质体和PEG包裹的胰岛素脂质体后, 其血糖降低的最低百分率(Cmin%)分别为:25.26±5.75%, 33.92±12.42% 42.39±10.5%; 达到最低百分率的时间(Tmin)分别为: 0.7±0.3, 1.2±0.42.3±0.7 h. 胰岛素脂质体和PEG包裹的胰岛素脂质体的药理相对生物利用度分别为: 98.03%99.70%. 结论 PEG包裹的胰岛素脂质体具有相对的缓释作用, 降血糖作用更为明显.

关键词: 胰岛素, 胰岛素, PEG包裹的胰岛素脂质体, PEG包裹的胰岛素脂质体, 药效学, 药效学

Abstract: Aim To evaluate liposome as an injectable delivery system of proteins, insulin was chosen as model drug and the hypoglycemic effect of PEG-coated liposomal insulin was tested. Methods The PEG-coated liposomal insulin was prepared by reversal-phase emulsion evaporation.For pharmacodynamic study, insulin (2.5 IU·kg-1) was intravenously administered in phosphated-buffered saline (PBS) solution, conventional liposomes, and PEG-coated liposomes, separately, to normal Wistar rats.Blood glucose levels were determined by the glucose oxidase method. Results The mean diameter of the PEG-coated liposomal insulin was 58.4 nm, while the encapsulation ratio reached 18.33%.After intravenous administration of insulin solution, insulin liposome, and PEG-coated liposomal insulin, the minimum blood glucose concentrations (Cmin %) reached 25.26±5.75%, 33.92±12.42%, and 42.39±10.5% of the initial level, respectively, and the time periods to reach the minimum blood glucose level (Tmin) were 0.7±0.3 h, 1.2±0.4 h, and 2.3±0.7 h, respectively.The relative pharmacological bioavailabilities of insulin liposome and PEG-coated liposomal insulin were 98.03% and 99.70%, respectively, compared with the control of insulin solution. Conclusion PEG-coated liposome can be developed as a relatively sustained injectable delivery system for insulin. Moreover, the liposome coated with PEG may have advantages over normal liposome.

Key words: insulin, insulin, polyethylene glycol-coated liposome, polyethylene glycol-coated liposome, pharmacodynamics, pharmacodynamics

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Supporting: Foundation item: National Natural Science Fundation of China(29992590-7).
*Corresponding author. Tel.: 010-82802791