Optimization of Bipolar Microsecond Electric Pulses for DNA Vaccine Delivery

Area of Science:

• Biomedical Engineering
• Molecular Biology
• Cell Biology

Background:

• Pulsed electric fields (PEFs) offer advantages over traditional methods for cellular applications.
• Bipolar microsecond and submicrosecond PEFs reduce muscle stimulation and pain, enabling novel clinical uses.
• Efficient DNA delivery into cells is crucial for gene therapies but often limited by poor cellular uptake.

Purpose of the Study:

• To optimize treatment parameters for bipolar microsecond pulsed electric fields to enhance DNA uptake in a 3D tissue model.
• To investigate the efficacy of different waveforms, doses, and delivery rates for electroporation.
• To compare the effectiveness of optimized PEF protocols with traditional electroporation methods.

Main Methods:

• 3D tissue models were treated with various microsecond PEF parameters (waveforms, doses, delivery rates).
• Small molecule uptake and cell viability were assessed to identify optimal conditions.
• Computational models determined reversible and lethal electroporation thresholds.
• DNA transfection efficiency was evaluated using optimized parameters and compared to conventional electroporation.

Main Results:

• A specific 2-1-2 waveform with a 1ms dose at 100μs/s achieved the highest DNA transfection rates.
• This optimized protocol resulted in a 7730% increase in transfected cells compared to traditional monopolar pulse protocols.
• Viability and uptake were key metrics evaluated to determine optimal PEF parameters.

Conclusions:

• Bipolar microsecond pulsed electric fields show significant promise for enhancing DNA delivery through reversible electroporation.
• Optimized PEF protocols can overcome the critical barrier of poor cellular uptake, advancing gene-related therapeutics.
• This research paves the way for improved DNA vaccine delivery and other novel gene therapies.