Silk Fibroin Microneedles for Transdermal Vaccine Delivery

Area of Science:

• Biomaterials Science
• Vaccinology
• Drug Delivery Systems

Background:

• Microneedles offer a novel parenteral injection alternative for vaccine delivery, targeting skin's immunocompetent cells.
• Previous microneedle vaccine delivery systems have shown variable success.
• Silk fibroin, from Bombyx mori, presents advantageous properties for microneedle fabrication.

Purpose of the Study:

• To investigate silk fibroin protein for microneedle production.
• To evaluate the efficacy of silk fibroin microneedles in delivering vaccines against influenza, Clostridium difficile, and Shigella.

Main Methods:

• Fabrication of microneedles using silk fibroin protein.
• Evaluation of microneedle properties: all-aqueous processing, mechanical strength, biocompatibility, and biomacromolecule stabilization.
• In vivo vaccination studies in mice using silk fibroin microneedles for three different antigens.

Main Results:

• Silk fibroin microneedles demonstrated suitable properties for vaccine delivery, combining advantages of dissolving and coated insoluble systems.
• Successful vaccination of mice against influenza, Clostridium difficile, and Shigella was achieved using silk fibroin microneedles.
• The biomaterial proved effective as a solid-coated microneedle delivery system.

Conclusions:

• Silk fibroin is a well-suited biomaterial for developing effective microneedle vaccine delivery systems.
• These microneedles offer long-term potential comparable to leading microneedle materials.
• Silk fibroin microneedles represent a promising platform for stable and efficient vaccine administration.