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Macromol Biosci. 2013 Oct;13(10):1438-46. doi: 10.1002/mabi.201300211. Epub 2013 Jul 19.

Effective tumor treatment by VEGF siRNA complexed with hydrophobic poly(amino acid)-modified polyethylenimine.

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  • 1Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.


Two copolymers are designed and synthesised for siRNA delivery based on polyethylenimine by grafting hydrophilic acrylamide segments and hydrophobic poly(γ-benzyl L-glutamate). The amphiphilic PEI-PBLG/siRNA complex demonstrates high gene silencing efficiency in the absence or presence of 10 vol% and 50 vol% sera in vitro. The anti-tumor effects in vivo are evaluated in luciferase-bearing mice expressing CT26 tumors. PEI-PBLG/siVEGF complex provides a higher and more sustained suppressive effect by reducing VEGF mRNA expression in the tumors, leading to higher tumor growth inhibition efficacy. Further studies on the potential use of the PEI-PBLG carrier system in mediating the silencing of genes other than VEGF or in other tumor models are recommended.

© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


RNA; amphiphiles; anti-tumor; gene therapy; hydrophilic polymers

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