Related Experiment Video
Updated: Dec 24, 2025
08:26
Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles
Published on: October 19, 2015
12.5K
Stable polymersomes based on ionic-zwitterionic block copolymers modified with superparamagnetic iron oxide
Gabriela Kania1, Urszula Kwolek, Keita Nakai
1Faculty of Chemistry, Jagiellonian University in Kraków, Ingardena 3, Kraków 30-060, Poland. kepczyns@chemia.uj.edu.pl nowakows@chemia.uj.edu.pl.
Journal of Materials Chemistry. B
|April 9, 2020
Summary
Stable polymersomes loaded with superparamagnetic iron oxide nanoparticles were developed as potential MRI contrast agents. These SPION/CCh-polymersomes show high r2 relaxivity and are non-cytotoxic, suggesting use in endothelium imaging.
Area of Science:
- Polymer Science
- Nanotechnology
- Biomedical Imaging
Background:
- Polymersomes offer versatile platforms for drug delivery and imaging.
- Superparamagnetic iron oxide nanoparticles (SPIONs) are widely used as MRI contrast agents.
- Developing targeted and effective contrast agents for vascular imaging remains a challenge.
Purpose of the Study:
- To synthesize and characterize stable polymersomes loaded with SPIONs coated with cationic chitosan (SPION/CCh).
- To evaluate the potential of these SPION/CCh-polymersomes as T2 contrast agents for MRI of the endothelium.
- To assess the biocompatibility and cellular uptake of the developed nanovesicles.
Main Methods:
- Preparation of polymersomes via self-assembly of oppositely charged diblock copolymers.
- Incorporation of SPION/CCh nanoparticles into the polymersome structure.
- Characterization using cryo-TEM, AFM, MFM, and MRI relaxivity measurements.
- Cytotoxicity and cellular uptake studies in EA.hy926 endothelial cells.
Main Results:
- Stable polymersomes encapsulating SPION/CCh nanoparticles were successfully synthesized with an average diameter of 250 nm.
- High T2 relaxivity (r2 = 573 ± 10 mM⁻¹ s⁻¹) was observed, indicating strong MRI contrast enhancement.
- SPION/CCh-polymersomes demonstrated good biocompatibility, with no cytotoxicity observed at relevant concentrations and significant uptake by endothelial cells.
Conclusions:
- SPION/CCh-polymersomes are stable, biocompatible nanovesicles with excellent MRI contrast properties.
- These findings suggest their potential utility as effective T2 contrast agents for non-invasive MRI of the vascular endothelium.
- Further in vivo studies are warranted to confirm their diagnostic capabilities.
