Laser-engineered dissolving microneedle arrays for protein delivery: potential for enhanced intradermal vaccination

Maelíosa T. C. McCrudden, Barbara M. Torrisi, Sharifah Al-Zahrani, Cian M. McCrudden, Marija Zaric, Christopher J. Scott, Adrien Kissenpfennig, Helen O. McCarthy, Ryan F. Donnelly

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


OBJECTIVES: We aimed to highlight the utility of novel dissolving microneedle (MN)-based delivery systems for enhanced transdermal protein delivery. Vaccination remains the most accepted and effective approach in offering protection from infectious diseases. In recent years, much interest has focused on the possibility of using minimally invasive MN technologies to replace conventional hypodermic vaccine injections.

METHODS: The focus of this study was exploitation of dissolving MN array devices fabricated from 20% w/w poly(methyl vinyl ether/maleic acid) using a micromoulding technique, for the facilitated delivery of a model antigen, ovalbumin (OVA).

KEY FINDINGS: A series of in-vitro and in-vivo experiments were designed to demonstrate that MN arrays loaded with OVA penetrated the stratum corneum and delivered their payload systemically. The latter was evidenced by the activation of both humoral and cellular inflammatory responses in mice, indicated by the production of immunoglobulins (IgG, IgG1, IgG2a) and inflammatory cytokines, specifically interferon-gamma and interleukin-4. Importantly, the structural integrity of the OVA following incorporation into the MN arrays was maintained.

CONCLUSION: While enhanced manufacturing strategies are required to improve delivery efficiency and reduce waste, dissolving MN are a promising candidate for 'reduced-risk' vaccination and protein delivery strategies.

Original languageEnglish
Pages (from-to)409-425
Number of pages17
JournalJournal of Pharmacy and Pharmacology
Issue number3
Early online date27 Mar 2014
Publication statusPublished - Mar 2015


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