Quantification and characterization of radical production in human, animal and 3D skin models during sun irradiation measured by EPR spectroscopy

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Item Type:	Article
Title:	Quantification and characterization of radical production in human, animal and 3D skin models during sun irradiation measured by EPR spectroscopy
Creators Name:	Albrecht, S., Elpelt, A., Kasim, C., Reble, C., Mundhenk, L., Pischon, H., Hedtrich, S., Witzel, C., Lademann, J., Zastrow, L., Beckers, I. and Meinke, M.C.
Abstract:	Sun radiation is indispensable to our health, however, a long term and high exposure could lead to erythema, premature skin aging and promotion of skin tumors. An underlying pathomechanism is the formation of free radicals. First, reactive oxygen species (OH, O(2)(-)) and then, secondary lipid oxygen species (C centered radicals, CCR) are formed. A high amount of free radicals results in oxidative stress with subsequent cell damage. In dermatological research different skin models are used, however, comparative data about the cutaneous radical formation are missing. In this study, the radical formation in porcine-, (SKH-1) murine-, human- ex vivo skin and reconstructed human skin (RHS) were investigated during simulated sun irradiation (305-2200 nm), with X-band EPR spectroscopy. The amount of radical formation was investigated with the spin probe PCA exposed to a moderate sun dose below one minimal erythema dose (MED, ~25 mJ/cm(2) UVB) in all skin models. Furthermore, the OH and CCR radical concentrations were measured with the spin trap DMPO within 0-4 MED (porcine-, human skin and RHS). The highest amount of radicals was found in RHS followed by murine and porcine, and the lowest amount in human ex vivo skin. In all skin models, more *OH than CCR radicals were found at 0-4 MED. Additionally, this work addresses the limitations in the characterization with the spin trap DMPO. The measurements have shown that the most comparable skin model to in vivo human skin could differ depending on the focus of the investigation. If the amount of radial production is regarded, RHS seems to be in a similar range like in vivo human skin. If the investigation is focused on the radical type, porcine skin is most comparable to ex vivo human skin, at an irradiation dose not exceeding 1 MED. Here, no comparison to in vivo human skin is possible.
Keywords:	Cyclic N-Oxides, Radiation Dose-Response Relationship, Electron Spin Resonance Spectroscopy, Free Radicals, Three-Dimensional Imaging, Biological Models, Oxidative Stress, Oxygen, Radiometry, Skin, Spin Labels, Sunlight, Tissue Culture Techniques, Animals, Mice, Swine
Source:	Free Radical Biology and Medicine
ISSN:	0891-5849
Publisher:	Elsevier
Volume:	131
Page Range:	299-308
Date:	1 February 2019
Official Publication:	https://doi.org/10.1016/j.freeradbiomed.2018.12.022
PubMed:	View item in PubMed

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