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  • Title: Dry-coated microprojection array patches for targeted delivery of immunotherapeutics to the skin.
    Author: Chen X, Prow TW, Crichton ML, Jenkins DW, Roberts MS, Frazer IH, Fernando GJ, Kendall MA.
    Journal: J Control Release; 2009 Nov 03; 139(3):212-20. PubMed ID: 19577597.
    Abstract:
    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 (<or=90 microm length) and densely packed (approximately 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.
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