Compositional optimization and safety assessment of a hydrogel patch as a transcutaneous immunization device.

Area of Science:

• Biomaterials Science
• Immunology
• Dermatology

Background:

• Transcutaneous immunization (TCI) offers a non-invasive vaccination route.
• Previous hydrogel patch formulations enhanced antigen (Ag) penetration through the stratum corneum (SC).
• Optimization and safety assessment of the hydrogel patch formulation are crucial for clinical translation.

Purpose of the Study:

• To optimize the composition of a hydrogel patch for transcutaneous immunization.
• To assess the safety profile of the optimized hydrogel patch formulation.
• To evaluate the efficacy of the hydrogel patch in eliciting Ag-specific immune responses.

Main Methods:

• Formulation of hydrogel patches with varying water content ratios.
• Assessment of antigen penetration through the stratum corneum.
• Evaluation of Ag-specific immune responses.
• Monitoring for local and systemic adverse reactions.

Main Results:

• A hydrogel patch with a 5% water content ratio demonstrated superior immune response induction compared to other compositions.
• Optimal moisture content in the hydrogel patch facilitates SC hydration, promoting antigen penetration.
• TCI using the hydrogel patch resulted in minimal local and systemic adverse reactions.

Conclusions:

• The optimized hydrogel patch formulation enhances antigen delivery for effective transcutaneous immunization.
• The developed TCI system exhibits a favorable safety profile.
• Further translational research is underway to evaluate the safety and efficacy in human subjects.