Drug delivery across the skin.

Area of Science:

• Pharmaceutical Sciences
• Dermatology
• Drug Delivery Systems

Background:

• The skin's stratum corneum presents a significant barrier to transdermal drug delivery (TTS).
• Conventional TTS methods often struggle with low bioavailability (<50%) and are limited to small molecules.
• Existing chemical enhancers can cause skin irritation.

Purpose of the Study:

• To explore advanced methods for overcoming skin barrier limitations in transdermal drug delivery.
• To evaluate the efficacy of novel lipid-based carriers, specifically Transfersomes, for enhanced drug permeation.
• To assess the potential of Transfersomes for delivering both small and large molecules, including challenging ones like polypeptides.

Main Methods:

• Review of existing TTS technologies, including chemical enhancers and physical poration methods (iontophoresis, sonoporation, electroporation).
• Investigation of lipid-based drug carriers, focusing on the mechanism and application of Transfersomes.
• Analysis of Transfersome interaction with the stratum corneum and their ability to facilitate molecule transport.

Main Results:

• Transfersomes demonstrate penetration along the natural moisture gradient of the skin.
• They effectively deliver both hydrophobic and hydrophilic molecules, regardless of size, after conjugation.
• Transdermal delivery via Transfersomes achieves high efficiency (>50%) with quasi-zero order kinetics and potential for regional targeting.

Conclusions:

• Transfersomes represent a promising, low-risk alternative for advanced transdermal drug delivery.
• They overcome the limitations of conventional TTS, enabling efficient delivery of a wider range of therapeutic agents.
• This technology holds potential for improved systemic drug levels and targeted therapeutic applications.