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Penetratin-functionalized PEG-PLA nanoparticles for brain drug delivery
Huimin Xia1, Xiaoling Gao, Guangzhi Gu
1Key Laboratory of Smart Drug Delivery, Ministry of Education & PLA, School of Pharmacy, Fudan University, Lane 826, Zhangheng Road, Shanghai 201203, PR China.
International Journal of Pharmaceutics
|July 31, 2012
Summary
Functionalizing nanoparticles with penetratin, a cell-penetrating peptide, enhances brain drug delivery. This strategy improves nanoparticle brain uptake and reduces off-target accumulation, offering a promising approach for treating brain diseases.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Pharmacology
Background:
- Nanoparticulate drug delivery systems offer advantages for brain drug delivery but face challenges with insufficient brain penetration.
- Cell-penetrating peptides (CPPs) can enhance cellular uptake but CPP-functionalized nanoparticles often suffer from rapid systemic clearance due to positive surface charges.
Purpose of the Study:
- To functionalize poly(ethylene glycol)-poly(lactic acid) nanoparticles (NP) with penetratin, a CPP with low basic amino acid content, to improve brain drug delivery.
- To evaluate the pharmacokinetic and biodistribution profiles of penetratin-functionalized nanoparticles (penetratin-NP) for enhanced brain targeting.
Main Methods:
- Penetratin was conjugated to poly(ethylene glycol)-poly(lactic acid) nanoparticles.
- Particle size, zeta potential, and surface conjugation were analyzed using dynamic light scattering and X-ray photoelectron spectroscopy.
- Cellular uptake mechanisms were investigated in an MDCK-MDR cell model.
- In vivo pharmacokinetic and biodistribution studies were conducted comparing penetratin-NP with protamine-functionalized nanoparticles.
Main Results:
- Penetratin-NP exhibited a particle size of 100 nm and a zeta potential of -4.42 mV.
- Enhanced cellular accumulation of penetratin-NP was observed via lipid raft-mediated endocytosis and direct translocation.
- In vivo studies demonstrated significantly increased brain uptake and reduced non-target tissue accumulation for penetratin-NP compared to protamine-NP.
- Surface charge modulation via penetratin conjugation improved nanoparticle pharmacokinetics and biodistribution for brain delivery.
Conclusions:
- Penetratin-functionalized nanoparticles represent a promising strategy for targeted brain drug delivery.
- The findings highlight the importance of surface charge modulation for optimizing nanoparticle brain targeting and overcoming clearance issues.
- This approach provides a foundation for developing advanced drug delivery systems for neurological disorders.
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