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| Item Type: | Article |
|---|---|
| Title: | Ethyl cellulose nanocarriers and nanocrystals differentially deliver dexamethasone into intact, tape-stripped or sodium lauryl sulfate-exposed ex vivo human skin - assessment by intradermal microdialysis and extraction from the different skin layers |
| Creators Name: | Döge, N. and Hönzke, S. and Schumacher, F. and Balzus, B. and Colombo, M. and Hadam, S. and Rancan, F. and Blume-Peytavi, U. and Schäfer-Korting, M. and Schindler, A. and Rühl, E. and Skov, P.S. and Church, M.K. and Hedtrich, S. and Kleuser, B. and Bodmeier, R. and Vogt, A. |
| Abstract: | Understanding penetration not only in intact, but also in lesional skin with impaired skin barrier function is important, in order to explore the surplus value of nanoparticle-based drug delivery for anti-inflammatory dermatotherapy. Herein, short-term ex vivo cultures of (i) intact human skin, (ii) skin pretreated with tape-strippings and (iii) skin pre-exposed to sodium lauryl sulfate (SLS) were used to assess the penetration of dexamethasone (Dex). Intradermal microdialysis was utilized for up to 24 h after drug application as commercial cream, nanocrystals or ethyl cellulose nanocarriers applied at the therapeutic concentration of 0.05%, respectively. In addition, Dex was assessed in culture media and extracts from stratum corneum, epidermis and dermis after 24 h, and the results were compared to those in heat-separated split skin from studies in Franz diffusion cells. Providing fast drug release, nanocrystals significantly accelerated the penetration of Dex. In contrast to the application of cream and ethyl cellulose nanocarriers, Dex was already detectable in eluates after 6 h when applying nanocrystals on intact skin. Disruption of the skin barrier further accelerated and enhanced the penetration. Encapsulation in ethyl cellulose nanocarriers delayed Dex penetration. Interestingly, for all formulations highly increased concentrations in the dialysate were observed in tape-stripped skin, whereas the extent of enhancement was less in SLS-exposed skin. The results were confirmed in tissue extracts and were in line with the predictions made by in vitro release studies and ex vivo Franz diffusion cell experiments. The use of 45 kDa probes further enabled the collection of inflammatory cytokines. However, the estimation of glucocorticoid efficacy by Interleukin (IL)-6 and IL-8 analysis was limited due to the trauma induced by the probe insertion. Ex vivo intradermal microdialysis combined with culture media analysis provides an effective, skin-sparing method for preclinical assessment of novel drug delivery systems at therapeutic doses in models of diseased skin. |
| Keywords: | Drug Delivery Systems, Polymeric Nanoparticles, Dexamethasone, Microdialysis, Skin Penetration, Skin Barrier Disruption |
| Source: | Journal of Controlled Release |
| ISSN: | 0168-3659 |
| Publisher: | Elsevier |
| Volume: | 242 |
| Page Range: | 25-34 |
| Date: | 28 November 2016 |
| Official Publication: | https://doi.org/10.1016/j.jconrel.2016.07.009 |
| PubMed: | View item in PubMed |
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