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Critical Reviews™ in Therapeutic Drug Carrier Systems
IF: 2.9 5-Year IF: 3.72 SJR: 0.736 SNIP: 0.551 CiteScore™: 2.43

ISSN Print: 0743-4863
ISSN Online: 2162-660X

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Critical Reviews™ in Therapeutic Drug Carrier Systems

DOI: 10.1615/CritRevTherDrugCarrierSyst.v23.i3.20
pages 205-258

Microneedles and Other Physical Methods for Overcoming the Stratum Corneum Barrier for Cutaneous Gene Therapy

Sion Coulman
Welsh School of Pharmacy, Cardiff University, Cardiff, CF10 3XF, UK
Chris Allender
Welsh School of Pharmacy, Cardiff University, Cardiff, CF10 3XF, UK
James Birchall
Lecturer in Drug Delivery Welsh School of Pharmacy, Cardiff University, Cardiff CF1 0 3XF, UK

ABSTRACT

The outermost layer of skin, the epidermis, has developed formidable physical and immunological barrier properties that prevent infiltration of deleterious chemicals and pathogens. Consequently, transdermal delivery of medicaments is currently restricted to a limited number of low molecular weight drugs. As a corollary, there has been significant recent interest in providing strategies that disrupt or circumvent the principal physical barrier, the stratum corneum, for the efficient cutaneous delivery of macromolecular and nucleic acid based therapeutics. These strategies include: electrical methods, intradermal injection, follicular delivery, particle acceleration, laser ablation, radiofrequency ablation, microscission, and microneedles. The application of microfabricated microneedle arrays to skin creates transient pathways to enable transcutaneous delivery of drugs and macromolecules. Microneedle use is simple, pain-free, and causes no bleeding, with further advantages of convenient manufacture, distribution, and disposal. To date, microneedles have been shown to deliver drug, peptide, antigen, and DNA efficiently through skin. Robust and efficient microneedle designs and compositions can be inserted into the skin without fracture. Further progress in microneedle array design, microneedle application apparatus, and integrated formulation will confirm this methodology as a realistic clinical strategy for delivering a range of medicaments, including DNA, to and through skin.


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