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Clustering Small Dendrimers into Nanoaggregates for Efficient DNA and siRNA Delivery with Minimal Toxicity
Author(s) -
Liu Chongyi,
Shao Naimin,
Wang Yitong,
Cheng Yiyun
Publication year - 2016
Publication title -
advanced healthcare materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.288
H-Index - 90
eISSN - 2192-2659
pISSN - 2192-2640
DOI - 10.1002/adhm.201500679
Subject(s) - dendrimer , phenylboronic acid , transfection , gene delivery , combinatorial chemistry , boronic acid , chemistry , materials science , nanotechnology , biochemistry , gene , catalysis
Cationic dendrimers are widely used as nonviral gene vectors, however, current gene materials based on dendrimers are either little effective or too toxic on the transfected cells. Here, a facile strategy is presented to prepare high efficient dendrimers with low transfection toxicity. Small dendrimers with 2 nm are clustered into nanoaggregates (≈100 nm) via phenylboronic acid modification and the self‐assembled materials enable efficient DNA and siRNA delivery on several cell lines. The clustered nanostructures can disassemble into small dendrimers in acidic conditions thus exerting significantly less toxicity on the transfected cells. Further structure–function relationship studies reveal that both the phenyl group and boronic acid group play essential roles in the self‐assembly and gene delivery processes. The transfection efficacy of phenylboronic acid‐modified dendrimers can be down‐regulated by blocking the boronic acid groups on dendrimers with diols or degrading the groups with hydrogen peroxide. This study provides a facile strategy in the development of efficient and biocompatible gene vectors based on low molecular weight polymers and clearly demonstrates the structure–function relationship of phenylboronic acid‐modified polymers in gene delivery.