Visualization and characterization of UVB-induced reactive oxygen species in a human skin equivalent model.

Abstract:

:Reactive oxygen species (ROS) play important roles in the process of ultraviolet-induced skin damage or photoaging. Although many enzymatic and chemical methods have been developed for evaluating ROS, evaluation methods for ROS generation in living systems are quite limited. Here we propose a unique system to visualize UVB-induced ROS and investigate the biological impact of ROS. In brief, a human skin equivalent model (HSEM) was exposed to UVB. Emitted luminescence from the HSEM was visualized and semi-quantified by using a chemiluminescent probe (CLA) and an ultra low-light imaging apparatus. The effects of anti-oxidative compounds such as ascorbate, beta-carotene, superoxide dismutase (SOD), and yeast ferment filtrate (YFF) on the HSEM were evaluated by semi-quantification of emitted chemiluminescence (CL) intensities, MTT assay and 8-hydroxy-2'-deoxyguanosine (8-OHdG) staining. Visualization of time- and space-dependent dynamics of ROS generation in the HSEM was successfully achieved by utilizing a sensitive two-dimensional ultra-low light luminograph. Treatments with beta-carotene and SOD effectively suppressed CL intensity, indicating the generation of 1O2 and O2 .- in the HSEM under UVB exposure. Tested anti-oxidative compounds also attenuated UVB-induced CL and ameliorated the induced skin damages in terms of 8-OHdG formation and cell death. As a conclusion, this model is useful for not only visualizing the production of UVB-induced ROS in real-time but also evaluating the efficacy of topically applied anti-oxidative compounds to suppress ROS generation and attenuate sequential chemical and biological responses.

journal_name

Arch Dermatol Res

authors

Hakozaki T,Date A,Yoshii T,Toyokuni S,Yasui H,Sakurai H

doi

10.1007/s00403-007-0804-3

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

S51-6

eissn

0340-3696

issn

1432-069X

journal_volume

300 Suppl 1

pub_type

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