ABSTRACT
Purpose
To prepare an angiopep-conjugated dendrigraft poly-L-lysine (DGL)-based gene delivery system and evaluate the neuroprotective effects in the rotenone-induced chronic model of Parkinson’s disease (PD).
Methods
Angiopep was applied as a ligand specifically binding to low-density lipoprotein receptor-related protein (LRP) which is overexpressed on blood-brain barrier (BBB), and conjugated to biodegradable DGL via hydrophilic polyethyleneglycol (PEG), yielding DGL-PEG-angiopep (DPA). In vitro characterization was carried out. The neuroprotective effects were evaluated in a chronic parkinsonian model induced by rotenone using a regimen of multiple dosing intravenous administrations.
Results
The successful synthesis of DPA was demonstrated via 1H-NMR. After encapsulating the therapeutic gene encoding human glial cell line-derived neurotrophic factor (hGDNF), DPA/hGDNF NPs showed a sphere-like shape with the size of 119 ± 12 nm and zeta potential of 8.2 ± 0.7 mV. Angiopep-conjugated NPs exhibited higher cellular uptake and gene expression in brain cells compared to unmodified counterpart. The pharmacodynamic results showed that rats in the group with five injections of DPA/hGDNF NPs obtained best improved locomotor activity and apparent recovery of dopaminergic neurons compared to those in other groups.
Conclusion
This work provides a practical non-viral gene vector for long-term gene therapy of chronic neurodegenerative disorders.
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Abbreviations
- BBB:
-
blood-brain barrier
- BCECs:
-
brain capillary endothelial cells
- DGL:
-
dendrigraft poly-L-lysine
- DPA:
-
DGL-PEG-angiopep
- GFP:
-
green fluorenscent protein
- hGDNF :
-
the gene encoding human glial cell line-derived neurotrophic factor
- LRP:
-
low-density lipoprotein receptor-related protein
- NMR:
-
nuclear magnetic resonance
- NPs:
-
nanoparticles
- PAMAM:
-
polyamidoamine
- PBS:
-
phosphate-buffered solution
- PD:
-
Parkinson’s disease
- PEG:
-
polyethylene glycol
- PPA:
-
PAMAM-PEG-angiopep
- TH:
-
tyrosine hydroxylase
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ACKNOWLEDGMENTS AND DISCLOSURES
Rongqin Huang and Haojun Ma contributed equally to this work. This work was supported by the grants from Specialized Research Fund for Doctoral Program (20090071120066), “Zhuo Xue” Talent Plan of Fudan University, “Chen Guang” project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation, and National Key Basic Research Program (2013CB932502) of China (973 Program).
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Huang, R., Ma, H., Guo, Y. et al. Angiopep-Conjugated Nanoparticles for Targeted Long-Term Gene Therapy of Parkinson’s Disease. Pharm Res 30, 2549–2559 (2013). https://doi.org/10.1007/s11095-013-1005-8
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DOI: https://doi.org/10.1007/s11095-013-1005-8