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Updated: May 18, 2026
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Evaluation of Polymeric Gene Delivery Nanoparticles by Nanoparticle Tracking Analysis and High-throughput Flow Cytometry
Published on: March 1, 2013
Surface modified poly(β amino ester)-containing nanoparticles for plasmid DNA delivery.
Rachel J Fields1, Christopher J Cheng, Elias Quijano
1Department of Biomedical Engineering, Yale University, New Haven, CT 06511, USA.
Summary
Biodegradable nanoparticles using poly(lactic-co-glycolic acid) and poly(beta-amino) ester offer safe gene delivery. Surface modification with cell-penetrating peptides enhances plasmid DNA loading and transfection efficiency while reducing toxicity.
Area of Science:
- Biomaterials science
- Gene therapy
- Nanotechnology
Background:
- Viral and liposomal vectors pose safety concerns for gene therapy.
- Biodegradable polymers offer a promising alternative for plasmid DNA delivery.
- Poly(lactic-co-glycolic acid) (PLGA) and poly(beta-amino) esters (PBAE) are key biodegradable polymers.
Purpose of the Study:
- To formulate and characterize novel nanoparticle (NP) systems for gene delivery using PLGA and PBAE blends.
- To evaluate the impact of PBAE content on NP properties, cellular uptake, and transfection efficiency.
- To investigate the efficacy of cell-penetrating peptide (CPP) surface modification in improving NP performance and reducing toxicity.
Main Methods:
- Formulation of PLGA-PBAE blended nanoparticles at various weight/weight ratios.
- Characterization of NPs for size, morphology, plasmid DNA (pDNA) loading, and surface charge.
- Assessment of cellular internalization and transfection efficiency in COS-7 and CFBE41o- cells.
- Surface modification of NPs with CPPs (mTAT, bPrPp, MPG) using a DSPE-PEG2000 linker.
- Evaluation of cytotoxicity and pDNA loading/transfection efficiency of CPP-modified NPs.
Main Results:
- NPs containing PBAE showed enhanced cellular internalization and transfection compared to PLGA-only NPs.
- PBAE incorporation led to increased cytotoxicity, presenting an engineering challenge.
- CPP surface coating significantly reduced NP surface charge and cellular toxicity.
- CPP-modified NPs exhibited improved pDNA loading, intracellular uptake, and transfection efficiency.
- bPrPp and MPG coatings resulted in 3-4.5x higher pDNA loading and an order of magnitude increase in transfection efficiency.
Conclusions:
- Surface-modified PBAE-containing NPs represent a highly effective and minimally toxic platform for plasmid DNA delivery.
- CPP functionalization is a viable strategy to overcome the limitations of PBAE-based gene delivery systems.
- These findings advance the development of safe and efficient non-viral gene delivery vectors for therapeutic applications.
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