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Delivery of Therapeutic siRNA to the CNS Using Cationic and Anionic Liposomes
Published on: July 23, 2016
Design of peptide-targeted liposomes containing nucleic acids
Adriana O Santos1, Lígia C Gomes da Silva, Luís M Bimbo
1Laboratory of Pharmaceutical Technology, University of Coimbra, Portugal.
Biochimica Et Biophysica Acta
|December 17, 2009
Summary
Researchers developed targeted liposomes for gene silencing therapy, achieving high encapsulation and cellular uptake in small cell lung cancer (SCLC) cells. However, improved delivery did not translate to enhanced protein downregulation, indicating a need for further optimization.
Area of Science:
- Biotechnology
- Nanomedicine
- Cancer Therapy
Background:
- Gene silencing therapy faces challenges in intracellular delivery to tumor cells.
- Targeted delivery systems, like ligand-functionalized liposomes, show promise for enhanced efficacy.
Purpose of the Study:
- To design targeted liposomes for efficient nucleic acid delivery into small cell lung cancer (SCLC) cells.
- To evaluate the impact of preparation methods and targeting ligands on liposome characteristics and cellular internalization.
Main Methods:
- Liposomes were prepared using post-insertion of DSPE-PEG-antagonist G conjugates.
- Encapsulation efficiency, size, loading capacity, and cellular uptake were assessed.
- The effect on target protein (Bcl-2) downregulation was evaluated in SCLC cells.
Main Results:
- Targeted liposomes (stabilized lipid particles) exhibited ~100% encapsulation efficiency and ~130 nm size.
- Enhanced internalization was observed in SCLC, other tumor cells, and HMEC-1 cells.
- Despite improved cellular association, Bcl-2 protein downregulation was not significantly enhanced.
Conclusions:
- Targeted liposomes demonstrate efficient cellular uptake but require further optimization for cytoplasmic nucleic acid delivery.
- Improving intracellular trafficking post-endocytosis is crucial for effective gene silencing therapy.
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