Abstract
Purpose
Apolipoprotein E2 (ApoE2) gene therapy is a potential disease-modifying therapy for Alzheimer’s disease (AD). We investigated the potential of plasmid encoding ApoE2 loaded brain-targeted functionalized-liposomes for treatment of AD. This was achieved via systemic administration of liposomes entrapping therapeutic gene targeting the brain of mice.
Methods
Targeting and transfection efficiency of designed liposomes were determined in bEnd.3, primary glial and primary neuronal cells. The ability of liposomal formulations to translocate across in vitro blood-brain barrier (BBB) and, thereafter, transfect primary neuronal cells was investigated using in vitro triple co-culture BBB model. We quantified ApoE expression in the brain of mice after single intravenous injection of brain-targeted liposomes loaded with plasmid ApoE2.
Results
Dual surface modification enhanced the in vitro transfection efficiency of designed liposomes. Successful delivery of therapeutic gene overcoming BBB by Transferrin-Penetratin- modified liposomes was demonstrated both in vitro and in vivo. Significant (p < 0.05) increase in ApoE levels in the brain of mice was observed after intravenous administration of Tf-Pen-liposomes encasing plasmid ApoE2.
Conclusion
The results indicate that dual-ligand based liposomal gene delivery systems had both enhanced brain targeting and gene delivery efficiencies. Transferrin-Penetratin modified liposomes for delivery of plasmid ApoE2 has great potential for AD treatment.
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Abbreviations
- AD:
-
Alzheimer’s disease
- BBB:
-
Blood brain barrier
- CPP:
-
Cell-penetrating peptide
- DOPE:
-
1,2-dioleoyl-sn-glycero-3-phosphoethanolamine
- DOTAP:
-
1,2-dioleoyl-3-trimethylammonium-propane
- FBS:
-
Fetal bovine serum
- H&E:
-
Hematoxylin and eosin
- LOAD:
-
Late onset form of Alzheimer’s disease
- MTT:
-
(3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium Bromide)
- p/s:
-
Penicillin and streptomycin
- Pen:
-
Penetratin
- TEER:
-
Transepithelial electrical resistance
- Tf:
-
Transferrin
- TfR:
-
Transferrin receptor
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Acknowledgments and Disclosures
This research was supported by National Institutes of Health (Grant R01AG051574). B.S.R. is supported by doctoral fellowship from The Brazilian National Council for Scientific and Technological Development (CNPq, Brazil) with a scholarship for B.S.R (Full Doctorate Fellowship (GDE): 221327/2014–2). The authors report no conflict of interest.
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dos Santos Rodrigues, B., Kanekiyo, T. & Singh, J. ApoE-2 Brain-Targeted Gene Therapy Through Transferrin and Penetratin Tagged Liposomal Nanoparticles. Pharm Res 36, 161 (2019). https://doi.org/10.1007/s11095-019-2691-7
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DOI: https://doi.org/10.1007/s11095-019-2691-7