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Updated: May 24, 2026
In Vitro and In Vivo Delivery of Magnetic Nanoparticle Hyperthermia Using a Custom-Built Delivery System
Published on: July 2, 2020
Controlled cell death by magnetic hyperthermia: effects of exposure time, field amplitude, and nanoparticle
1Instituto de Nanociencia de Aragón, University of Zaragoza, Mariano Esquillor, 50018 Zaragoza, Spain.
Purpose:
To investigate the effects of alternating magnetic fields (AMF) on the death rate of dendritic cells (DCs) loaded with magnetic nanoparticles (MNPs) as heating agents. AMF exposure time and amplitude as well as the MNPs concentration were screened to assess the best conditions for a controlled field-induced cell death.
Methods:
Human-monocyte-derived DCs were co-incubated with dextran-coated MNPs. The cells were exposed to AMF (f = 260 kHz; 0 < H(0) < 12.7 kA/m) for intervals from 5 to 15 min. Morphology changes were assessed by scanning electron microscopy. Cell viability was measured by Trypan blue and fluorescence-activated cell sorting (FACS) using Annexin-propidium iodide markers.
Results:
We were able to control the DCs viability by a proper choice AMF amplitude and exposure time, depending on the amount of MNPs uploaded. About 20% of cells showed Annexin-negative/PI-positive staining after 5-10 min of AMF exposure.
Conclusions:
Controlled cell death of MNP-loaded DCs can be obtained by adequate tuning of the physical AMF parameters and MNPs concentration. Necrotic-like populations were observed after exposure times as short as 10 min, suggesting a fast underlying mechanism for cell death. Power absorption by the MNPs might locally disrupt endosomic membranes, thus provoking irreversible cell damage.
Insights
Alternating magnetic fields (AMF) can control dendritic cell (DC) death when loaded with magnetic nanoparticles (MNPs). Researchers optimized AMF parameters and MNP concentration for targeted cell death induction.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Cell Biology
Background:
- Dendritic cells (DCs) are crucial for immune responses.
- Magnetic nanoparticles (MNPs) offer potential for targeted therapies.
- Controlled cell death induction is a key goal in therapeutic applications.
Purpose of the Study:
- To investigate the impact of alternating magnetic fields (AMF) on the viability of magnetic nanoparticle (MNP)-loaded dendritic cells (DCs).
- To identify optimal AMF exposure time, amplitude, and MNP concentration for inducing controlled cell death.
- To assess the feasibility of field-induced cell death for therapeutic strategies.
Main Methods:
- Human monocyte-derived DCs were co-incubated with dextran-coated MNPs.
- Cells were exposed to AMF (260 kHz; 0-12.7 kA/m) for 5-15 minutes.
- Cell morphology, viability (Trypan blue), and apoptosis/necrosis (Annexin V/PI via FACS) were analyzed.
Main Results:
- DC viability was controllable by adjusting AMF parameters and MNP concentration.
- Approximately 20% of cells exhibited necrotic-like characteristics (Annexin-negative/PI-positive) after 5-10 minutes of AMF exposure.
- Morphological changes were observed, indicating cellular damage.
Conclusions:
- Controlled necrotic-like cell death of MNP-loaded DCs is achievable through precise tuning of AMF parameters and MNP concentration.
- Rapid cell death mechanisms, potentially involving endosomal membrane disruption by MNP power absorption, were suggested.
- This approach holds promise for targeted cell ablation in therapeutic contexts.
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