期刊
INTERNATIONAL JOURNAL OF PHARMACEUTICS
卷 509, 期 1-2, 页码 314-327出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijpharm.2016.05.060
关键词
PAMAM-OH; beta-thiopropionate; Acid-labile polymer; Gene delivery; Transfection; Cytotoxicity
资金
- Natural Science Foundation Committee of China [81173004, 81202483]
The present report describes the synthesis of a hydroxyl terminal PAMAM dendrimer (PAMAM-OH) derivative (PAMSPF). The hydroxyls of PAMAM-OH were attached to S-Methyl-L-cysteine (SMLC) via an acid-labile ester bond, named as beta-thiopropionate bond, followed by modification with folic acid (FA) through a polyethylene glycol (PEG) linker. The degrees of attachment of SMLC and FA to the PAMAM-OH backbone were 83.9% and 12.8%, respectively. PAMSPF could condense DNA to form spherical nanoparticles with particle sizes of similar to 200 nm and remain stable in the presence of heparin and nuclease. The beta-thiopropionate bond in PAMSPF was hydrolyzed completely and the DNA release rate was 95.8 +/- 3.3% after incubation under mildly acidic conditions at 37 degrees C for 3 h. PAMSPF/DNA was less cytotoxic to KB and HepG2 cells and exhibited a higher gene transfection efficiency than native PAMAM/DNA. The uptake assays showed that PAMSPF/DNA entered KB cells within 0.5 h through folate receptor-mediated endocytosis and escaped from endosomes within 2 h. In addition, PAMSPF/DNA displayed long circulation time along with excellent targeting of tumor sites in vivo. These findings demonstrate that PAMSPF is an excellent carrier for safe and effective gene delivery. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据