Transcutaneous vaccines--current and emerging strategies

Area of Science:

• Immunology
• Biotechnology
• Dermatology

Background:

• Vaccination is crucial for global health but faces delivery challenges in developing countries.
• Conventional injection systems present disadvantages that limit vaccine accessibility.
• Transcutaneous immunization (TCI) presents an innovative, user-friendly vaccination method.

Purpose of the Study:

• To review current strategies for transcutaneous immunization (TCI).
• To discuss advancements in adjuvant development for TCI.
• To highlight challenges and future directions for TCI implementation.

Main Methods:

• Review of TCI strategies including patch systems and nanoparticles for antigen permeation.
• Exploration of physical methods like electroporation and microneedles to bypass the skin barrier.
• Discussion on the role of adjuvants in enhancing TCI efficacy.

Main Results:

• TCI approaches aim to promote antigen skin permeation or physically breach the skin barrier.
• Nanoparticles, patches, electroporation, and microneedles are key technologies explored for TCI.
• Adjuvant development is a critical component for optimizing TCI effectiveness.

Conclusions:

• Various TCI methods show potential for effective, painless, and convenient vaccination.
• Manufacturing and clinical trial guidelines for TCI lag behind technological development.
• Further understanding of skin physiology and TCI device properties is essential for refining guidelines and improving transcutaneous vaccination.