Publikationsdatenbank

Qualifying X-ray and Stimulated Raman Spectromicroscopy for Mapping Cutaneous Drug Penetration (2019)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Wanjiku, Barbara

Yamamoto, Kenji

Klossek, André

Schumacher, Fabian

Pischon, Hannah

Mundhenk, Lars (WE 12)

Rancan, Fiorenza

Judd, Martyna M

Ahmed, Muniruddin

Zoschke, Christian

Kleuser, Burkhard

Rühl, Eckart

Schäfer-Korting, Monika

Quelle

Analytical chemistry

Bandzählung: 91

Heftzählung: 11

Seiten: 7208 – 7214

ISSN: 1520-6882

Sprache

Englisch

Verweise

DOI: 10.1021/acs.analchem.9b00519

Pubmed: 31090401

Kontakt

Institut für Tierpathologie

Robert-von-Ostertag-Str. 15
14163 Berlin
+49 30 838 62450
pathologie@vetmed.fu-berlin.de

Abstract / Zusammenfassung

Research on topical drug delivery relies on reconstructed human skin (RHS) in addition to ex vivo human and animal skin, each with specific physiological features. Here, we compared the penetration of dexamethasone from an ethanolic hydroxyethyl cellulose gel into ex vivo human skin, murine skin, and RHS. For comprehensive insights into skin morphology and penetration enhancing mechanisms, scanning transmission X-ray microscopy (STXM), liquid chromatography tandem-mass spectrometry (LC-MS/MS), and stimulated Raman spectromicroscopy (SRS) were combined. STXM offers high spatial resolution with label-free drug detection and is therefore sensitive to tissue damage. Despite differences in sample preparation and data analysis, the amounts of dexamethasone in RHS, detected and quantified by STXM and LC-MS/MS, were very similar and increased during the first 100 min of exposure. SRS revealed interactions between the gel and the stratum corneum or, more specifically, its protein and lipid structures. Similar to both types of ex vivo skin, higher protein-to-lipid ratios within the stratum corneum of RHS indicated reduced lipid amounts after 30 min of ethanol exposure. Extended ethanol exposure led to a continued reduction of lipids in the ex vivo matrixes, while protein integrity appeared to be compromised in RHS, which led to declining protein signals. In conclusion, LC-MS/MS proved the predictive capability of STXM for label-free drug detection. Combining STXM with SRS precisely dissected the penetration enhancing effects of ethanol. Further studies on topical drug delivery should consider the potential of these complementary techniques.