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Open AccessArticle

Improved Gene Transfer with Functionalized Hollow Mesoporous Silica Nanoparticles of Reduced Cytotoxicity

School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
Zhongshan WanYuan New Drug R&D Co., Ltd., Zhongshan 528451, China
School of Pharmacy, Memorial University of Newfoundland, Newfoundland and Labrador, St. John’s, NL A1B 3V6, Canada
Author to whom correspondence should be addressed.
Academic Editors: James Z. Tang and Charley Chuan-yu Wu
Materials 2017, 10(7), 731;
Received: 29 March 2017 / Revised: 1 June 2017 / Accepted: 2 June 2017 / Published: 30 June 2017
(This article belongs to the Special Issue Materials for Drug Delivery and Biomedical Consideration)
Gene therapy is a promising strategy for treatment of genetically caused diseases. Successful gene delivery requires an efficient carrier to transfer the desired gene into host cells. Recently, mesoporous silica nanoparticles (MSNs) functionalized with 25 kD polyethyleneimine (PEI) were extensively used as gene delivery carriers. However, 25 kD PEI could significantly reduce the safety of the modified MSNs although it is efficient for intracellular delivery of nucleic acids. In addition, limited drug loading remains a challenge for conventional MSNs drug carriers. Hollow mesoporous silica nanoparticles (HMSNs) with high pore volume, tunable pore size, and excellent biocompatibility are attractive alternatives. To make them more efficient, a less toxic 1.8 kD PEI polymer was used to functionalize the HMSNs which have large pore size (~10 nm) and form PEI-HMSNs. Scanning and transmission electron microscopic images showed that HMSNs were spherical in shape and approximately 270 nm in diameter with uniform hollow nanostructures. The maximum loading capacity of green fluorescent protein labeled DNA (GFP-DNA) in PEI-HMSNs was found to be 37.98 mg/g. The loading capacity of PEI-HMSNs was nearly three-fold higher than those of PEI modified solid nanoparticles, indicating that both hollow and large pores contributed to the increase in DNA adsorption. The transfection of GFP-DNA plasmid loaded in PEI-HMSNs was increased two-fold in comparison to that of 25 kD PEI. MTT assays in Lovo cells showed that the cell viability was more than 85% when the concentration of PEI-HMSNs was 120 µg/mL, whereas the cell viability was less than 20% when the 25 kD PEI was used at the same concentration. These results indicated that PEI-HMSNs could be used as a delivery system for nucleic acids due to good biocompatibility, high gene loading capacity, and enhanced gene transfer efficiency. View Full-Text
Keywords: hollow mesoporous silica nanoparticles; PEI; gene transfer; cytotoxicity hollow mesoporous silica nanoparticles; PEI; gene transfer; cytotoxicity
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Zhan, Z.; Zhang, X.; Huang, J.; Huang, Y.; Huang, Z.; Pan, X.; Quan, G.; Liu, H.; Wang, L.; Wu, A.C. Improved Gene Transfer with Functionalized Hollow Mesoporous Silica Nanoparticles of Reduced Cytotoxicity. Materials 2017, 10, 731.

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