Journal
POLYMER
Volume 55, Issue 18, Pages 4634-4640Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.07.037
Keywords
Poly(amino acid)s; Star polymers; Gene delivery
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Funding
- National Natural Science Foundation of China [21374084]
- National Basic Research Program of China [2011CB606202]
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Multi-arm star polyornithines PEI-P(Orn)(n) are prepared by grafting polyornithine arms onto branched polyethylenimine (PEI) with an M-w of 600 via the ring-opening polymerization of N-carboxyanhydride of benzyloxycarbonyl omithine. To enhance gene delivery efficiency and reduce cytotoxicity, the amino side groups on the polyomithine arms are partially guanidinated that transforms the omithine units to arginine units. Thus, the guanidinated products G-PEI-P(Orn)(n) contain multiple poly(ornithine-co-arginine) arms. PEI-P(Orn)(n) and G-PEI-P(Orn)(71) mediate the transfection of pGL3 plasmid to 293T cells almost as efficient as 25 kDa PEI in serum-free medium. Notably, in contrast to the dramatically lowered efficiency of 25 kDa PEI in the presence of serum, the efficiency of G-PEI-P(Orn)(71) can be retained or even enhanced in the medium containing 10% serum. The improved serum-compatibility and high efficiency of the guanidinium-modified star polyornithines make them promising for gene delivery. (C) 2014 Elsevier Ltd. All rights reserved.
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