A Dual Targeting Drug Delivery System for Penetrating Blood-Brain Barrier and Selectively Delivering siRNA to Neurons for Alzheimer’s Disease Treatment

Author(s): Chi Zhang, Zhichun Gu, Long Shen, Xianyan Liu, Houwen Lin*.

Journal Name: Current Pharmaceutical Biotechnology

Volume 18 , Issue 14 , 2017

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Abstract:

Background: Alzheimer’s disease (AD) is one of most serious threats to human beings, however, the treatment is hindered by blood-brain barrier and poor intra-brain cell selectivity.

Methods: In this study, we developed a novel dual targeting drug delivery system by modification of NL4 peptide and apolipoprotein A-I (ApoA-I) onto dendrimer particles that may efficiently deliver siRNA into neuron cells to down-regulate BACE1 and inhibit Aβ formation. The constructed ANNP/ siRNA was approximately 79.26 nm with a spherical structure and a zeta potential of 3.53 mV. At N/P ratio of 10, the siRNA could be completely packaged into particles to avoid degradation by RNAase.

Results: In vitro, the modification with ApoA-I considerably increased bEnd.3 cell uptake and NL-4 considerably increased PC12 cell uptake. As a result, ANNP/siRNA showed higher uptake in both the cells. In addition, ANNP/siRNA could efficiently penetrate through bEnd.3 monolayers, which was 2.4-fold higher than unmodified complexes. In PC12 cells, the ANNP/siRNA could escape from endosomes and transport into cytoplasm after 8 h incubation, resulting in 87.5% BACE1 gene knockdown capacity, which was better than PEI. Additionally, the particles showed low cytotoxicity to both bEnd.3 and PC12 cells.

Conclusion: In conclusion, this study preliminarily demonstrated that ApoA-I and NL4 dual modified dendrimer nanoparticles were efficient carriers for siRNA delivery to AD bearing brain.

Keywords: Blood brain barrier, ALzheimer's disease, dual targeting, gene delivery, AD treatment, nanoparticles.

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Article Details

VOLUME: 18
ISSUE: 14
Year: 2017
Page: [1124 - 1131]
Pages: 8
DOI: 10.2174/1389201019666180226152542
Price: $58

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