Sterically polymer-based liposomal complexes with dual-shell structure for enhancing the siRNA delivery
Shuian-Yin Lin1, Wei-Yu Zhao, Hsieh-Chih Tsai
1Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan, Republic of China.
Biomacromolecules
|February 1, 2012
Summary
Sterically polymer-based liposomal complexes (SPLexes) enhance siRNA delivery stability and efficiency. Folated SPLexes show improved in vitro and in vivo accumulation, leading to significant protein expression inhibition.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Gene Delivery
Background:
- siRNA delivery systems face challenges in stability and efficiency.
- Liposomal complexes offer potential for nucleic acid delivery.
- Polymeric liposomes can be engineered for targeted delivery and controlled release.
Purpose of the Study:
- To develop and characterize sterically polymer-based liposomal complexes (SPLexes) for enhanced siRNA delivery.
- To evaluate the stability, efficiency, and targeting capabilities of SPLexes.
- To investigate the pH-sensitive release mechanism and in vivo performance of SPLexes.
Main Methods:
- Formation of dual-shelled SPLexes using cationic polymeric liposomes and pH-sensitive diblock copolymer.
- Characterization of SPLexes for size distribution and structure.
- In vitro and in vivo studies to assess cellular uptake, tumor accumulation, and gene silencing efficacy.
- Evaluation of PEGylated and folated SPLexes for improved biocompatibility and targeting.
Main Results:
- SPLexes exhibited a dual-shelled structure with uniform size distribution.
- PEGylation of SPLexes reduced phagocytosis and cytotoxicity.
- Folated SPLexes demonstrated a 42.9× increase in in vitro accumulation and 1.7× higher tumor uptake in vivo.
- Efficient siRNA release at low pH led to 75.6 ± 4.5% inhibition of protein expression.
Conclusions:
- SPLexes represent a promising platform for stable and efficient siRNA delivery.
- Surface modification with folate enhances tumor targeting and cellular uptake.
- The pH-sensitive nature of the copolymer facilitates endosomal escape and cytoplasmic siRNA release.
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