高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (6): 1295.

• 研究论文 • 上一篇    下一篇

具有脑靶向功能的125I-AIBZM纳米脂质体

李光慧, 沈海星, 钱隽, 司展, 朱建华   

  1. 复旦大学药学院放射药学教研室,  教育部和全军智能化递药重点实验室, 上海  201203
  • 收稿日期:2010-10-28 修回日期:2010-12-22 出版日期:2011-06-10 发布日期:2011-05-10
  • 通讯作者: 朱建华 E-mail:jhzhu@shmu.edu.cn
  • 基金资助:

    国家“九七三”计划项目(批准号: 2007CB935800)资助.

125I-AIBZM Nanoliposomes  Targeting Brain as Imaging Agents

LI Guang-Hui, SHEN Hai-Xing, QIAN Jun, SI Zhan, ZHU Jian-Hua*   

  1. Department of Radiopharmacy, School of Pharmacy, Fudan University, Key Laboratory of Smart Drug Delivery, Ministry of Education & PLA, Shanghai 201203, China
  • Received:2010-10-28 Revised:2010-12-22 Online:2011-06-10 Published:2011-05-10
  • Contact: ZHU Jian-Hua E-mail:jhzhu@shmu.edu.cn
  • Supported by:

    国家“九七三”计划项目(批准号: 2007CB935800)资助.

摘要: 本文目的是将苯甲酰胺类衍生物125I -(S)-N-(1-乙基-2-吡咯烷基)甲基-5-碘-4-氨基-2-甲氧基苯酰胺(125I-AIBZM)包载于具有脑靶向功能的纳米脂质体载药系统中,以提高125I-AIBZM的入脑量. 本文采用硫酸铵梯度主动载药法制备了125I-AIBZM-脂质体(125I-AIBZM-L)和125I-AIBZM-Lf-脂质体(125I-AIBZM-Lf-L),脂质体形状规则、分布均匀、粒径在100 nm左右,两种脂质体的125I-AIBZM包封率分别为39%和35%. 包载荧光素DIR的DIR-脂质体(DIR-L)和DIR- Lf-脂质体(DIR-Lf-L)的小鼠的荧光活体成像研究显示DIR-Lf-L具有明显的脑靶向性,证实了Lf介导脑靶向的功能. 药动学实验显示125I-AIBZM-L与125I-AIBZM-Lf-L大鼠体内血循环时间比125I-AIBZM明显延长,各时相125I-AIBZM-Lf-L的入脑量显著高于125I-AIBZM-L(p<0.01),而125I-AIBZM-L的入脑量又显著高于125I-AIBZM(p<0.01). 结论:125I-AIBZM纳米脂质体载药系统能显著提高125I-AIBZM的入脑量.

关键词: 125I, 多巴胺D2受体, 乳铁蛋白, 脂质体, 荧光活体成像

Abstract: The aim of this study is to develop a blood brain barrier (BBB) permeable nano-liposome drug delivery system that significantly up-regulates the brain uptake of (S)-5-125I-N-(1-ethyl-2-pyrrolidinyl)methyl-4-amine-2-methoxy-benzamide (125I-AIBZM) as an imaging agent. Both 125I-AIBZM-nanoliposome (125I-AIBZM-L) and 125I-AIBZM-lactoferrin-nanoliposome (125I-AIBZM-Lf-L) were prepared by the ammonium sulfate gradient method with a small particle size (~100 nm) and a narrow size distribution pattern. The encapsulation efficiencies of 125I-AIBZM-L and 125I-AIBZM-Lf-L were measured as 39% and 35% respectively. In vivo fluorescence imaging results showed that DIR-Lf-L successfully delivered drug into the brain. The pharmacokinetic experiments in rats indicated that the blood circulation times of 125I-AIBZM-L and 125I-AIBZM-Lf-L were substantially longer than that of small molecular 125I-AIBZM. Amount of intracerebral 125I-AIBZM delivered by 125I-AIBZM-L was significantly lower than 125I-AIBZM-Lf-L (p <0.01) but remarkably higher than that of 125I-AIBZM (p <0.01). Conclusion: 125I-AIBZM-Lf-L nano-liposome drug delivery system can increase the brain uptake of imaging agent 125I-AIBZM.

Key words: 125I, Dopamine D2 receptor, Lactoferrin, liposome, In vivo fluorescence imaging

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