Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 45, Pages 31311-31320Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09915
Keywords
polyethylenimine; polyethylene glycol; hydrothermal reduction; nanographene oxide; photothermal effect; gene delivery
Funding
- National Natural Science Foundation of China [61527825, 81471699]
- Science and Technology Plan Project of Guangdong Province [2014B090901060]
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In this study, a physiologically stable dual-polymer-functionalized reduced nanographene oxide (nrGO) conjugate (PEG-nrGO-PEI, RGPP) with high efficiency of gene delivery is successfully synthesized through mixing PEGylated nanographene oxide (PEG-nGO, GP) and polyethylenimine (PEI, 25 kDa) solution under 80 degrees C for 2 h. This hydrothermal reduction of GP during PElylation promotes the nucleophilic reaction between the amino moieties of PEI and the epoxy groups (or carboxylic groups) in GP and then forms C-NH- groups (or NH-CO groups) to covalently connect PEI and GP, which makes the RGPP nanocomposite more stable in physiological environments and has superior gene transfection efficiency compared with the nonhydrothermally reduced PEG-nGO/PEI conjugate (GPP) obtained by mixing GP and PEI under 20 degrees C for 2 h. Moreover, 808 nm laser irradiation (2 W/cm(2)) for 25 min increases 4.5-fold of gene transfection efficiency for RGPP but does not increase the gene transfection efficiency of GPP. Finally, RGPP is also able to efficiently deliver functional plasmid GFP-Bax (pGFP-Bax), exhibiting similar to 43% of transfection efficiency in HepG2 cells. Collectively, the RGPP developed here is a highly efficient nanocarrier for gene delivery, and this work encourages further explorations of developing functionalized reduced nano-GO for high-efficiency gene therapy.
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