Targeted cellular ablation based on the morphology of malignant cells

Area of Science:

• Biophysics
• Oncology
• Biomedical Engineering

Background:

• Glioblastoma multiforme (GBM) treatment faces challenges targeting diffuse infiltrative and therapy-resistant glioma stem cells.
• Current therapies often lack specificity, leading to recurrence and poor outcomes.

Purpose of the Study:

• To investigate pulsed electric fields (PEFs) as a physical treatment method for glioblastoma.
• To determine if PEFs can be tuned to preferentially target and ablate malignant cells based on nuclear size.

Main Methods:

• Numerical modeling of cell electroporation with varying pulse durations and cell morphology.
• In vitro testing using 3D hydrogel models of normal and malignant brain tissues.
• Treatment of spontaneous canine GBM with PEFs.

Main Results:

• PEF efficacy depends on pulse duration and cellular morphology, with short pulses (~1 μs) creating high intracellular fields.
• Intracellular field strength scales with nucleus size, suggesting potential for targeting based on nuclear enlargement in malignant cells.
• PEFs were successfully tuned to preferentially kill cancerous cells in 3D tissue models and canine GBM.

Conclusions:

• PEFs represent a promising physical modality for glioblastoma treatment.
• Tuning PEF parameters based on nuclear size may enable targeted ablation of malignant cells, including therapy-resistant populations.
• This approach could improve GBM treatment safety and efficacy by targeting cancer-specific cellular characteristics.