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Updated: Mar 13, 2026

Ex Vivo Red Blood Cell Hemolysis Assay for the Evaluation of pH-responsive Endosomolytic Agents for Cytosolic Delivery of Biomacromolecular Drugs

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Published on: March 9, 2013

Probing Endosomal Escape Using pHlexi Nanoparticles.

Nachnicha Kongkatigumjorn¹, Christina Cortez-Jugo², Ewa Czuba²

¹School of Chemistry, The University of Melbourne, Parkville, Victoria, 3010, Australia.

Macromolecular Bioscience

|October 28, 2016

Summary

This summary is machine-generated.

Polymer molecular weight significantly impacts nanocarrier endosomal escape. Higher molecular weight poly[2-(diethylamino)ethyl methacrylate] nanoparticles enhance cellular drug delivery by improving endosomal escape efficiency.

Keywords:

endosomal escape nanoparticles pH responsive therapeutic delivery

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Area of Science:

Nanomedicine
Polymer Chemistry
Cellular Biology

Background:

Effective endosomal escape of nanocarriers is crucial for intracellular drug delivery.
pH-responsive, self-assembled dual-component nanoparticles show promise for overcoming endosomal entrapment.

Purpose of the Study:

To investigate the role of polymer molecular weight in tuning the endosomal escape efficiency of nanoparticle delivery systems.
To synthesize and characterize poly[2-(diethylamino)ethyl methacrylate] (PDEAEMA) and poly(ethylene glycol)-b-poly[2-(diethylamino)ethyl methacrylate] (PEG-b-PDEAEMA) based nanoparticles.

Main Methods:

Synthesis of PDEAEMA with varying molecular weights (7-106 kDa) via reversible addition-fragmentation chain transfer (RAFT) polymerization.
Co-assembly of PDEAEMA and PEG-b-PDEAEMA (16 kDa) into nanoparticles using nanoprecipitation.
Characterization of particle size, pH-responsiveness, toxicity, and ovalbumin loading/release.
Assessment of cellular association and endosomal escape using ovalbumin as a marker.

Main Results:

All synthesized nanoparticles exhibited similar sizes, pH-responsive behavior, and low toxicity across different molecular weights.
Endosomal escape efficiency was directly correlated with PDEAEMA molecular weight.
Nanoparticles with higher molecular weight PDEAEMA (106 kDa) demonstrated significantly enhanced endosomal escape (42% of cells) compared to lower molecular weight counterparts (7 kDa).

Conclusions:

Polymer molecular weight is a critical parameter for optimizing nanocarrier-mediated endosomal escape.
Tailoring PDEAEMA molecular weight offers a simple yet effective strategy to enhance nanoparticle effectiveness for intracellular therapeutic delivery.