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Title: Sustained delivery of siRNA/mesoporous silica nanoparticle complexes from nanofiber scaffolds for long-term gene silencing
Authors: Pinese, Coline
Lin, Junquan
Milbreta, Ulla
Li, Mingqiang
Wang, Yucai
Leong, Kam W.
Chew, Sing Yian
Keywords: Gene Silencing
DRNTU::Science::Medicine::Biomedical engineering
Issue Date: 2018
Source: Pinese, C., Lin, J., Milbreta, U., Li, M., Wang, Y., Leong, K. W., & Chew, S. Y. (2018). Sustained delivery of siRNA/mesoporous silica nanoparticle complexes from nanofiber scaffolds for long-term gene silencing. Acta Biomaterialia, 76164-177. doi:10.1016/j.actbio.2018.05.054
Series/Report no.: Acta Biomaterialia
Abstract: A low toxicity and efficient delivery system is needed to deliver small interfering RNAs (siRNA) in vitro and in vivo. The use of mesoporous silica nanoparticles (MSN) is becoming increasingly common due to its biocompatibility, tunable pore size and customizable properties. However, bolus delivery of siRNA/MSN complexes remains suboptimal, especially when a sustained and long-term administration is required. Here, we utilized electrospun scaffolds for sustained delivery of siRNA/MSN-PEI through surface adsorption and nanofiber encapsulation. As a proof-of-concept, we targeted collagen type I expression to modulate fibrous capsule formation. Surface adsorption of siRNA/MSN-PEI provided sustained availability of siRNA for at least 30 days in vitro. As compared to conventional bolus delivery, such scaffold-mediated transfection provided more effective gene silencing (p < 0.05). On the contrary, a longer sustained release was attained (at least 5 months) when siRNA/MSN-PEI complexes were encapsulated within the electrospun fibers. In vivo subcutaneous implantation and biodistribution analysis of these scaffolds revealed that siRNA remained localized up to ~290 m from the implants. Finally, a fibrous capsule reduction of ~45.8 % was observed after 4 weeks in vivo as compared to negative scrambled siRNA treatment. Taken together, these results demonstrate the efficacy of scaffold-mediated sustained delivery of siRNA/MSN-PEI for long-term non-viral gene silencing applications.
ISSN: 1742-7061
DOI: 10.1016/j.actbio.2018.05.054
Schools: School of Chemical and Biomedical Engineering 
Lee Kong Chian School of Medicine (LKCMedicine) 
Rights: © 2018 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Acta Biomaterialia, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:LKCMedicine Journal Articles
SCBE Journal Articles

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