Electromagnetic Field-Programmed Magnetic Vortex Nanodelivery System for Efficacious Cancer Therapy

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Intratumoral transport barriers impede effective anticancer drug delivery to the nucleus.
• Developing magnetic nanovehicles for electromagnetic field (EF)-activated drug delivery faces challenges in achieving multi-level responses within a single nanoparticle system.
• Modularizing tandem magnetoresponsive activities is crucial for addressing both tissue and cellular level delivery requirements.

Purpose of the Study:

• To develop a nanodelivery system capable of sequential magnetoresponses for cascaded tissue penetration and nuclear accumulation of anticancer drugs.
• To engineer magnetic nanovehicles that can be precisely controlled by sequential electromagnetic field frequencies.
• To enhance the efficacy of Doxorubicin (DOX) delivery into the nucleus of cancer cells, including drug-resistant types.

Main Methods:

• Fabrication of magnetic nanovehicles: ferrimagnetic vortex-domain iron oxide nanorings coated with a thermo-responsive polyethylenimine copolymer (PI/FVIOs).
• Sequential electromagnetic field (EF) stimulation: utilizing low frequency (Lf)-EF for magnetophoresis and medium frequency (Mf)-EF for magneto-thermia.
• In vivo and in vitro drug delivery assessment: quantifying nuclear accumulation of Doxorubicin (DOX)-loaded nanovehicles in various cancer models.

Main Results:

• The programmed cascading of Lf-EF-induced magnetophoresis and Mf-EF-stimulated magneto-thermia effectively steers DOX-loaded PI/FVIOs to deep tissues.
• Sequential Lf-EF and Mf-EF operation enabled 86.2% drug delivery into the nucleus in vivo.
• The nanodelivery system demonstrated potent antitumoral activity against DOX-resistant MCF-7, triple-negative MDA-MB-231 breast cancer, and BxPC-3 pancreatic cancer cells.

Conclusions:

• A novel nanodelivery system employing sequential EF frequencies successfully overcomes tumor transport barriers for enhanced nuclear drug delivery.
• The developed magnetic nanovehicles offer a promising strategy for targeted cancer therapy, particularly for intractable and drug-resistant tumors.
• This approach provides a modular and programmable platform for advanced magnetoresponsive drug delivery systems.