Effects of branched or linear architecture of bioreducible poly(amido amine)s on their in vitro gene delivery properties

JOURNAL OF CONTROLLED RELEASE

卷:164

Article; Proceedings Paper

Martello, Federico²  Piest, Martin¹  Engbersen, Johan F. J.¹  Ferruti, Paolo² 

[1] Univ Twente, Dept Biomed Chem, MIRA Inst Biomed Technol & Tech Med, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

[2] Univ Milan, Dipartimento Chim Organ & Ind, I-20133 Milan, Italy

关键词: Michael addition;    Hyperbranched poly(amido amine);    Gene delivery;    Polyplex;    Disulfide reduction;   

DOI  :  10.1016/j.jconrel.2012.07.029

来源: Elsevier

【 摘 要 】

In this study, the gene delivery properties of new hyperbranched poly(amido amine)s (PAAs) with disulfide linkages in the main chain were investigated in comparison with their linear analogs. Eight different bioreducible PAAs were prepared by Michael addition of N,N'-bisacryloylpiperazine (BP) with cystamine (CYST) or N,N'-dimethylcystamine (DMC) and of N,N'-cystaminebisacrylamide (CBA) with N,N'-ethylenediamine (EDA) or N,N'-dimethylethylenediamine (DMEDA). In order to study the effect of terminal groups on the transfection efficiency, each polymer was terminated with 4-aminobutanol (ABOL) or with 2-aminoethanol (ETA). The hyperbranched and the linear PAAs generally formed polyplexes with plasmid DNA with sizes around 200 nm and positive zeta potentials ranging from + 10 to + 22 mV at polymer/DNA weight ratios equal or higher than 3/1. Remarkably low or no cytotoxicity was observed for both hyperbranched and linear PAAs. Hyperbranched CBA-containing PAAs showed higher gene expression in DNA transfection tests with COS-7 cells than their linear analogs and up to two times higher than linear PEI that was used as the reference polymer. Transfection efficiencies of the branched PAAs were generally enhanced by the presence of serum, which is a promising property for future in vivo studies with these hyperbranched PAAs. In this study the ease of synthetic modification of both linear and hyperbranched poly(amido amide)s and the versatility of hyperbranched PAAs in regulating DNA transfection and cytotoxicity are demonstrated. The results show the large possibilities for this class of polymers to provide polymeric vectors with controllable properties for gene therapy applications. (c) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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