Saturated anionic phospholipids enhance transdermal transport by electroporation

Area of Science:

• Biophysics
• Materials Science
• Pharmacology

Background:

• Electroporation is a method for enhancing transdermal molecule transport.
• The role of lipids in modulating electroporation-mediated transport is not fully understood.
• Optimizing lipid enhancers is crucial for effective transdermal drug and vaccine delivery.

Purpose of the Study:

• To investigate the effect of anionic phospholipids on transdermal transport enhancement by electroporation.
• To identify specific anionic phospholipids and their properties that maximize transport efficiency.
• To elucidate the mechanism by which anionic phospholipids facilitate transdermal delivery.

Main Methods:

• Electroporation of porcine skin in the presence of various phospholipids.
• Quantification of transdermal flux for water-soluble molecules (carboxyfluorescein, FITC-Dextran).
• Confocal and conventional fluorescence microscopy to track phospholipid localization and transport pathways.

Main Results:

• Anionic phospholipids, particularly saturated ones like Dimyristoylphosphatidylserine (DMPS), enhanced transdermal flux by 1-2 orders of magnitude.
• Anionic phospholipids localized within electroporation-induced transport regions (LTRs), with saturated DMPS showing greater retention in the stratum corneum.
• Transport enhancement was independent of lipid encapsulation, and saturated anionic lipids prolonged stratum corneum lipid recovery.

Conclusions:

• Anionic phospholipids, especially saturated variants, are potent enhancers of electroporation-mediated transdermal transport.
• DMPS demonstrates superior efficacy due to better mixing and retention within the stratum corneum lipids.
• Understanding these lipid-enhancer interactions enables rational design for improved transdermal drug and vaccine delivery.