期刊
JOURNAL OF CONTROLLED RELEASE
卷 306, 期 -, 页码 59-68出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconrel.2019.05.024
关键词
Skin, 3D confocal microscopy; Pore lifetime; Metabolic lifetime; Microneedles; Drug delivery; Histamine sensitisation, FLIM
资金
- Australian Research Council Centre of Excellence in Convergent Bio-Nano Science & Technology Grant [140100036CE]
- Australian Research Council [DP1093281]
- Australian National Health & Medical Research Council Fellowship [1107356]
- Australian Government Research Training Program Scholarship
- AIBN top up scheme
- Curtin International Postgraduate Research Scholarship
- LaVision MPM
- Vaxxas
- University of Queensland
- Centre for Microscopy and Microanalysis
- Australian Institute for Bioengineering and Nanotechnology
- Princess Alexandra Hospital staff and skin donors
- Australian Research Council [DP1093281] Funding Source: Australian Research Council
Skin-targeting microscale medical devices are becoming popular for therapeutic delivery and diagnosis. We used cryo-SEM, fluorescence lifetime imaging microscopy (FLIM), autofluorescence imaging microscopy and inflammatory response to study the puncturing and recovery of human skin ex vivo and in vivo after discretised puncturing by a microneedle array (Nanopatch (R)). Pores induced by the microprojections were found to close by similar to 25% in diameter within the first 30 min, and almost completely close by similar to 6 h. FLIM images of ex vivo viable epidermis showed a stable fluorescence lifetime for unpatched areas of similar to 1000 ps up to 24 h. Only the cells in the immediate puncture zones (in direct contact with projections) showed a reduction in the observed fluorescence lifetimes to between similar to 518-583 ps. The ratio of free-bound NAD(P)H (alpha 1/alpha 2) in unaffected areas of the viable epidermis was similar to 2.5-3.0, whereas the ratio at puncture holes was almost double at similar to 4.2-4.6. An exploratory pilot in vivo study also suggested similar closure rate with histamine administration to the forearms of human volunteers after Nanopatch (R) treatment, although a prolonged inflammation was observed with Tissue Viability Imaging. Overall, this work shows that the pores created by the microneedle-type medical device, Nanopatch (R), are transient, with the skin recovering rapidly within 1-2 days in the epidermis after application.
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