Abstract
Purpose
Development of a polyethylene glycol (PEG)-stabilized immunoliposome (PSIL) formulation with high DNA content suitable for in vivo intravenous administration and targeted gene delivery.
Materials and Methods
Plasmid DNA was condensed using 40% ethanol and packaged into neutral PSILs targeted to the mouse transferrin receptor using monoclonal antibodies (MAbs; clones RI7 and 8D3) attached to their PEG maleimide moieties. PSILs size was measured by quasi-elastic light scattering. The targeting capacity of the formulation was determined by transfection of mouse neuroblastoma Neuro 2A (N2A) cells with PSIL-DNA complexes conjugated with either RI7 or 8D3 MAbs.
Results
DNA encapsulation and MAb conjugation efficiencies averaged 71 ± 14% and 69 ± 5% (mean ± SD), respectively. No alteration in mean particle size (< 100 nm) or DNA leakage were found after 48 h storage in a physiological buffer, and the in vivo terminal half-life reached 23.9 h, indicating that the PSIL-DNA formulation was stable. Addition of free RI7 MAbs prevented transfection of N2A cells with PSIL-DNA complexes conjugated with either RI7 or 8D3 MAbs, confirming that the transfection was transferrin receptor-dependent.
Conclusions
The present data suggest that our new PSIL formulation combines molecular features required for targeted gene therapy including high DNA encapsulation efficiencies and vector-specific transient transfection capacity.
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Abbreviations
- 2I:
-
2-iminothiolane
- AAV:
-
adeno-associated virus
- ATP:
-
adenosine 5′-triphosphate
- AV:
-
adenovirus
- BSA:
-
bovine serum albumine
- CMV:
-
cytomegalovirus
- [33P]-dCTP:
-
deoxycytidine 5′-[α-33P]triphosphate
- DDAB:
-
didodecyldimethylammonium bromide
- Dpm:
-
disintegrations per minute
- DSPE:
-
distearoylphosphatidylethanolamine
- EtOH:
-
ethanol
- HEPES:
-
4-(2-hydroxyethyl)piperazine-1-ethanesulfonic acid
- HSV-1:
-
herpes simplex virus-1
- LSC:
-
liquid scintillation counting
- MAbs:
-
monoclonal antibodies
- MWCO:
-
molecular weight cut-off
- N2A:
-
neuroblastoma neuro 2A
- NC:
-
non-conjugated
- 3H-NSP:
-
N-succinimidyl-[2,3-3H] propionate
- PBS:
-
phosphate buffered saline
- PCR:
-
polymerase chain reaction
- pGLuc:
-
pCMV-GLuc
- PEG:
-
polyethylene glycol
- PEG2000 :
-
2,000 da polyethylene glycol
- POPC:
-
1-palmitoyl-2-oleoyl-sn-glycerol-3-phosphocholine
- PSLs:
-
PEG-stabilized liposomes
- PSILs:
-
PEG-stabilized immunoliposomes
- RLU:
-
relative light units
- RT:
-
room temperature
- QELS:
-
quasi-elastic light scattering
- SEM:
-
standard error mean
- SCID:
-
severe combined immunodeficiency
- SD:
-
standard deviation
- SV40:
-
simian virus 40
- VP-SFM:
-
virus production serum-free medium
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Acknowledgements
Grants from the Canadian Institutes of Health Research (CIHR) (FC-RMP72549 and M2C-63922), the Alzheimer Society Canada (FC-ASC 0516), and the Parkinson Society Canada (FC 2004) funded this research. VR was supported by FORMSAV-CIHR and Laval University “Fonds d’Enseignement et de Recherche” faculty of pharmacy studentships.
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The authors declare that they have no competing financial interests.
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Rivest, Phivilay, contributed equally to this work.
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Rivest, V., Phivilay, A., Julien, C. et al. Novel Liposomal Formulation for Targeted Gene Delivery. Pharm Res 24, 981–990 (2007). https://doi.org/10.1007/s11095-006-9224-x
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DOI: https://doi.org/10.1007/s11095-006-9224-x