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Updated: May 19, 2026
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Published on: May 2, 2017
External magnetic field-induced selective biodistribution of magnetoliposomes in mice
Sonia García-Jimeno1, Elvira Escribano, Josep Queralt
1Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona, Avda, Joan XXIII, Barcelona, Catalonia, 08028, Spain. joanestelrich@ub.edu.
Abstract:
This study looked at the effect of an external magnet on the biodistribution of magnetoliposomes intravenously administrated in mice (8 mg iron/kg) with and without induced acute inflammation. Our results showed that due to enhanced vascular permeability, magnetoliposomes accumulated at the site of inflammation in the absence of an external magnetic field, but the amount of iron present increased under the effect of a magnet located at the inflammation zone. This increase was dependent on the time (20 or 60 min) of exposure of the external magnetic field. It was also observed that the presence of the magnet was associated with lower amounts of iron in the liver, spleen, and plasma than was found in mice in which a magnet had not been applied. The results of this study confirm that it is possible to target drugs encapsulated in magnetic particles by means of an external magnet.
Insights
External magnets can enhance the accumulation of magnetoliposomes at inflammation sites in mice. This magnetic targeting reduces iron accumulation in organs like the liver and spleen, improving drug delivery potential.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Pharmacology
Background:
- Magnetoliposomes are nanoparticles with potential for targeted drug delivery.
- Understanding biodistribution is crucial for optimizing nanoparticle-based therapies.
- Inflammation can alter vascular permeability, affecting nanoparticle accumulation.
Purpose of the Study:
- To investigate the effect of an external magnetic field on magnetoliposome biodistribution.
- To evaluate magnetoliposome accumulation at sites of acute inflammation.
- To assess the influence of magnetic targeting on iron levels in organs and plasma.
Main Methods:
- Intravenous administration of magnetoliposomes (8 mg iron/kg) in mice.
- Induction of acute inflammation in experimental groups.
- Application of an external magnet at the inflammation zone for varying durations (20 or 60 min).
Main Results:
- Magnetoliposomes showed natural accumulation at inflammation sites due to enhanced vascular permeability.
- External magnetic field application significantly increased magnetoliposome iron accumulation at the inflammation zone.
- Magnetic targeting led to reduced iron levels in the liver, spleen, and plasma compared to non-magnet groups.
Conclusions:
- External magnets can effectively enhance magnetoliposome targeting to inflamed tissues.
- Magnetic targeting improves drug delivery efficiency by concentrating nanoparticles at the desired site.
- This approach offers a promising strategy for site-specific drug delivery using magnetic nanoparticles.
