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Evaluation of Polymeric Gene Delivery Nanoparticles by Nanoparticle Tracking Analysis and High-throughput Flow Cytometry

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Published on: March 1, 2013

Phosphonium-containing polyelectrolytes for nonviral gene delivery.

Sean T Hemp¹, Michael H Allen, Matthew D Green

¹Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States.

Biomacromolecules

|December 6, 2011

Summary

Phosphonium polymers show enhanced DNA binding and gene transfection compared to ammonium analogs in nonviral gene therapy. This discovery offers new synthetic vectors for improved gene delivery vehicles.

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Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery

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Published on: August 6, 2019

Area of Science:

Biochemistry
Polymer Chemistry
Molecular Biology

Background:

Nonviral gene therapy utilizes nitrogen-containing macromolecules and lipids for DNA delivery.
Existing therapies face challenges in efficient DNA condensation and delivery.
Phosphonium-containing macromolecules present a novel alternative to ammonium analogs.

Purpose of the Study:

To compare the DNA binding and gene transfection capabilities of phosphonium-containing polymers with their ammonium analogs.
To investigate the influence of polymer structure on gene delivery efficacy.
To elucidate the cellular uptake mechanisms of novel gene delivery vectors.

Main Methods:

Synthesis of phosphonium- and ammonium-containing homopolymers via free radical polymerization.
Analysis of polymer molecular weights using aqueous size exclusion chromatography.
Assessment of DNA binding using gel shift assays and gene transfection efficiency via luciferase expression assays.
Investigation of cellular uptake mechanisms using fluorescently labeled DNA and endocytic inhibitors.

Main Results:

Phosphonium polymers demonstrated superior DNA binding at lower charge ratios compared to ammonium analogs.
Improved luciferase expression was observed with phosphonium-based vectors.
Alkyl chain length significantly influenced transfection efficacy, with tributyl-based vectors showing success.
Cellular uptake was confirmed, with caveolae-mediated endocytosis identified as the primary pathway.

Conclusions:

Replacing ammonium with phosphonium cations in polymeric vectors enhances DNA binding and gene transfection.
The findings introduce a new class of synthetic vectors for nonviral gene delivery.
This research may significantly advance the field of gene therapy by offering improved delivery vehicles.