Optimization of a plasma facilitated DNA delivery method.

Area of Science:

• Biophysics
• Gene Delivery
• Plasma Medicine

Background:

• Plasma-based methods offer a novel approach for augmenting plasmid DNA delivery into skin.
• This technique utilizes ionized gas to create an electric field, inducing transient cell membrane permeability.
• The electric field is hypothesized to cause dielectric breakdown, facilitating the entry of exogenous molecules.

Purpose of the Study:

• To optimize intradermal plasmid DNA delivery using plasma-based methods.
• To investigate the effects of varying plasma exposure time and plasmid DNA dose on gene expression.
• To determine the optimal parameters for efficient in vivo plasmid DNA delivery to skin.

Main Methods:

• An in vivo study was conducted to evaluate plasmid DNA delivery in skin.
• Plasma exposure times were varied (2, 5, 10, 20 min) using helium gas at 15 L/min, 3 cm from the tissue surface.
• Different doses of luciferase-expressing plasmid DNA (50, 100, 200 μg) were tested at optimized plasma exposure conditions.

Main Results:

• A 10-minute plasma exposure significantly enhanced luciferase expression, with a 37.3-fold increase for +8 kV and 27.1-fold for -8 kV plasma.
• The optimal plasmid DNA dose for maximal luminescence was found to be 100 μg.
• Peak luminescence was observed under specific plasma generation parameters (+8 kV or -8 kV, 10 min exposure, 3 cm distance, 15 L/min helium flow).

Conclusions:

• Plasma-based methods are effective for enhancing intradermal plasmid DNA delivery.
• Optimized plasma exposure time (10 min) and DNA dose (100 μg) maximize gene expression in vivo.
• This study provides crucial parameters for the application of plasma technology in gene therapy and skin treatments.