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Optimisation of polyethylenimine-based gene delivery to mouse brain
G F Lemkine1, D Goula, N Becker
1Laboratoire de Physiologie Générale et Comparée, UMR CNRS 8572, Muséum National d'Histoire Naturelle, Paris, France.
Journal of Drug Targeting
|February 22, 2000
Summary
Optimizing polyethylenimine (PEI) gene delivery involves reducing DNA load to prevent nuclear overload, enhancing transgene expression duration. Co-expression of anti-apoptotic genes like bcl-X(L) further prolongs gene expression in vivo.
Area of Science:
- Gene therapy
- Neuroscience
- Biotechnology
Background:
- Polyethylenimine (PEI) is an effective gene delivery vector, but short-term gene expression limits its in vivo applications.
- High levels of short-term expression suggest potential nuclear overload with foreign DNA as a cause for expression loss.
Purpose of the Study:
- To investigate the effect of DNA dosage on transgene expression duration using PEI.
- To explore the potential of co-expressing anti-apoptotic genes to enhance long-term gene expression.
Main Methods:
- Digoxin-labelled plasmid DNA complexed with 22 kD linear PEI was used for intraventricular injection in newborn mice.
- DNA localization was assessed at 24 hours post-injection.
- Dose-response curves were established by varying DNA amounts.
- Co-expression of bcl-X(L) with luciferase or LacZ was performed to evaluate long-term expression.
Main Results:
- Delivered DNA localized to nuclear and perinuclear regions within 24 hours.
- Optimal transgene expression yield was achieved with 100 ng of DNA per injection, significantly outperforming 1 microg.
- Co-expression of bcl-X(L) significantly increased luciferase and LacZ expression at one week post-injection.
Conclusions:
- Reducing DNA dosage to 100 ng optimizes PEI-mediated gene delivery, enhancing expression yield and duration.
- Co-expressing anti-apoptotic genes like bcl-X(L) is a viable strategy to prolong transgene expression in vivo.