Transdermal delivery enhanced by magainin pore-forming peptide

Area of Science:

• Biochemistry
• Dermatology
• Materials Science

Background:

• Magainin is a peptide known for pore formation in bacterial membranes.
• Stratum corneum lipid structure is a primary barrier to skin penetration.
• Chemical enhancers are often required to improve transdermal drug delivery.

Purpose of the Study:

• To test if magainin increases skin permeability by disrupting stratum corneum lipids.
• To investigate if magainin requires a surfactant chemical enhancer for enhanced skin penetration.
• To explore the synergistic effect of magainin and a chemical enhancer on skin permeability.

Main Methods:

• In vitro skin permeability assays using fluorescein as a model drug.
• Confocal microscopy to visualize magainin penetration into the stratum corneum.
• Fourier-transform infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry to analyze lipid structure changes.

Main Results:

• N-lauroyl sarcosine (NLS) in ethanol increased skin permeability 15-fold.
• Magainin combined with NLS-ethanol synergistically increased skin permeability 47-fold.
• Magainin alone showed poor skin penetration, while NLS-ethanol enhanced deep penetration and further disrupted stratum corneum lipids.

Conclusions:

• NLS-ethanol facilitates magainin penetration into the stratum corneum, enhancing lipid disruption and skin permeability.
• This study demonstrates the first use of a pore-forming peptide to increase skin permeability.
• A novel concept of using sequential chemical enhancers to achieve synergistic increases in skin permeability is presented.