Preparation and characterization of silk fibroin/oligochitosan nanoparticles for siRNA delivery

[Display omitted] •We prepared silk fibroin/oligochitosan/siRNA nanoparticles as a novel gene carrier.•These nanoparticles are more stable than oligochitosan polyplexes.•siRNA condensation and gene silencing are increased by increasing silk fibroin.•Lower cytotoxicity and higher transfection are obt...

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Bibliographic Details
Published in:Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2015-12, Vol.136, p.867-877
Main Authors: Shahbazi, Behzad, Taghipour, Mina, Rahmani, Hamid, Sadrjavadi, Komail, Fattahi, Ali
Format: Article
Language:English
Subjects:
Carriers
Cell Line
Cellular
Chitin - analogs & derivatives
Chitin - chemistry
Computational efficiency
Computing time
Fibroins - chemistry
Gene silencing
Genes
Humans
Nanoparticles
Oligochitosan
RNA, Small Interfering - administration & dosage
Silk - chemistry
Silk fibroin
siRNA
Stability
Uptakes
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Summary:[Display omitted] •We prepared silk fibroin/oligochitosan/siRNA nanoparticles as a novel gene carrier.•These nanoparticles are more stable than oligochitosan polyplexes.•siRNA condensation and gene silencing are increased by increasing silk fibroin.•Lower cytotoxicity and higher transfection are obtained compared to that of polyplexes. siRNA therapy offers hope treating diseases caused by genetic defects as well as viral infections and cancers, although it has been limited by the low stability of siRNA and its rapid degradation in the presence of nucleases as well as its low cellular uptake. In this study, oligochitosan (OC) combined with silk fibroin (SF) was formulated and proposed as a novel carrier for siRNA. The obtained SF/OC/siRNA nanoparticles (NPs) were characterized according to their physicochemical properties, such as their size, zeta potential, loading efficiency, stability, cytotoxicity, cellular uptake and transfection efficiency, and their properties were compared with those of OC polyplexes. The mean diameter of SF/OC/siRNA NPs was not significantly different compared to polyplexes, and the particle size ranged between 250 and 450nm. Increased amounts of SF in NPs enhanced their loading efficiency, and NPs showed excellent stability in the presence of FBS and heparin compared with OC polyplexes. Additionally, MTT assays demonstrated that SF/OC/siRNA NPs had lower cytotoxicity. NPs showed better gene silencing with or without FBS, which could be attributed to increased loading efficiency, serum stability and cellular uptake. These properties suggest that SF/OC/siRNA NPs have a strong potential as gene carriers.
ISSN:0927-7765
1873-4367
DOI:10.1016/j.colsurfb.2015.10.044