Dry-coated microprojection array patches for targeted delivery of immunotherapeutics to the skin

作者：Chen Xianfeng; Prow Tarl W; Crichton Michael L; Jenkins Derek W K; Roberts Michael S; Frazer Ian H; Fernando Germain J P; Kendall Mark A F^*

来源：Journal of Controlled Release, 2009, 139(3): 212-220.

DOI：10.1016/j.jconrel.2009.06.029

• Microprojections
• Gas-jet drying coating
• Targeted vaccine delivery

Dry-coated microprojections (MPs) deliver vaccine to abundant immunogenic cells within the skin to induce immune responses. Success in this targeted vaccine delivery relies on overcoming the challenges of dry-coating the vaccine onto the very small (<= 90 mu m length) and densely packed (similar to 20,000 cm(-2)) MPs. In this paper, we show that a gas-jet drying coating method achieves the desired uniform coating. The coating approach is robustly demonstrated on compounds representative of a range of immunotherapeutics (e.g. DNA, proteins), with each uniformly coated on thousands of MPs. Furthermore, the dry-coating remains intact during skin insertion, and then releases within the wet skin cellular environment within 3 min. Finally, we applied ovalbumin protein coated MP patches to immunise mice, achieving comparable antibody levels (p = 0.08) with needle and syringe intramuscular injection. in summary, this paper presents a simple, practical and versatile method to achieve uniform coating on very small and densely packed MPs for a needle-free and targeted vaccine delivery technology.

• 出版日期2009-11-3