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Updated: Aug 4, 2026
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Delivery of Therapeutic siRNA to the CNS Using Cationic and Anionic Liposomes
Published on: July 23, 2016
Photochemically enhanced gene delivery with cationic lipid formulations
Marit Hellum1, Anders Høgset, Birgit O Engesaeter
1Dept. of Biophysics, Institute for Cancer Research, The Norwegian Radiumhospital, Montebello, 0310 Oslo, Norway.
Summary
Photochemical internalisation (PCI) enhances gene delivery by releasing DNA from endocytic vesicles. This method significantly improves transfection when using specific lipid combinations, depending critically on treatment timing.
Area of Science:
- Biotechnology
- Molecular Biology
- Cell Biology
Background:
- Gene delivery relies on efficient DNA transport into cells.
- Lipidic vectors face challenges with DNA entrapment in endocytic vesicles.
- Photochemical internalisation (PCI) offers a method to overcome endosomal barriers.
Purpose of the Study:
- To investigate the impact of PCI on gene transfection efficiency.
- To evaluate PCI's effect on specific cationic lipid formulations (betaAE-DMRIE with/without DOPE).
- To determine the influence of treatment timing on PCI efficacy.
Main Methods:
- Utilisation of cationic lipid N-(2-aminoethyl)-N,N-dimethyl-2,3-bis(tetradecyloxy)-1-propanaminium bromide (betaAE-DMRIE) and helper lipid 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE).
- Application of photochemical internalisation (PCI) involving photosensitizers and light activation.
- Systematic variation of the timing and sequence of PCI and DNA delivery.
Main Results:
- PCI did not enhance transfection mediated by betaAE-DMRIE alone.
- PCI significantly boosted transfection efficiency when using the betaAE-DMRIE/DOPE combination.
- The effectiveness of PCI was strongly dependent on the temporal relationship between illumination and DNA delivery.
Conclusions:
- PCI is a viable strategy to improve gene transfer mediated by specific lipidic vectors.
- The combination of betaAE-DMRIE and DOPE benefits significantly from PCI-mediated endosomal escape.
- Optimizing the timing of PCI is crucial for maximizing gene delivery enhancement.
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