Externally Applied Electromagnetic Fields and Hyperthermia Irreversibly Damage Cancer Cells.

Area of Science:

• Oncology
• Biophysics
• Nanomedicine

Background:

• Non-ionizing radiation (NIR) applications in cancer therapy are currently limited.
• Biocompatible magnetic nanoparticles are explored as heat mediators, but more efficient nanomaterials are needed.
• Developing novel strategies to enhance cancer treatment efficacy is crucial.

Purpose of the Study:

• To investigate the combined effects of externally applied electromagnetic fields (EMFs) and hyperthermia (HT) on tumor cell viability.
• To explore the potential of combining EMFs and HT with chemotherapy or targeted therapy for cancer treatment.
• To evaluate an experimental device combining EMFs and high-intensity focused ultrasound (HIFU)-induced HT in vivo.

Main Methods:

• In vitro studies exposed human cancer cell lines (melanoma, pancreas, breast) to EMFs and/or HT.
• In vivo experiments utilized an integrated device with EMFs and HIFU-induced HT on AsPC1 xenografts.
• Cell viability, lysosomal permeability, cathepsin release, and mitochondrial pathways were analyzed.

Main Results:

• EMFs or HT alone had limited effects on cancer cell viability in vitro.
• The combination of EMFs and HT significantly decreased viability across different cancer cell lines (16-50% of control).
• Combined therapy (EMFs, HT, chemotherapy/targeted therapy) resulted in complete cancer cell elimination in vitro and complete tumor regression in vivo.

Conclusions:

• The combination of EMFs and HT is a promising strategy to enhance cancer treatment efficacy.
• This combined approach induces cancer cell death through lysosomal and mitochondrial pathways.
• Further development of combined therapies holds potential for effective oncotherapy.