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Original Paper

Influence of Repetitive UVA Stimulation on Skin Protection Capacity and Antioxidant Efficacy

Rohr M. · Rieger I. · Jain A. · Schrader A.

Author affiliations

Institut Dr. Schrader Creachem GmbH, Holzminden, Germany

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Skin Pharmacol Physiol 2011;24:300–304

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: August 16, 2010
Accepted: March 22, 2011
Published online: July 15, 2011
Issue release date: September 2011

Number of Print Pages: 5
Number of Figures: 3
Number of Tables: 1

ISSN: 1660-5527 (Print)
eISSN: 1660-5535 (Online)

For additional information: http://www.karger.com/SPP

Abstract

Background/Aims: Topically applied antioxidants (AOs) are widely used in cosmetic products – especially in day and sun care – to help reduce oxidative stress caused by exogenous influences such as ultraviolet (UV) radiation. Despite several advances in recent years, little is known about the duration of protective effects by application of topical AOs, AO protection capacity (APC) or the activation of an endogenous protection capacity (EPC). Methods: By measuring oxidative-stress-induced photon emission of human skin in vivowith the ICL-S method (induced chemiluminescence of human skin), the protective effect of daily AO treatment for 2 weeks was examined on 4 consecutive days after treatment. UVA-dose-independent effects were investigated by decay curve intersection point analysis. In addition, chemiluminescence signal integration was used to investigate the influence of different UVA doses for stimulation on the determined APC as well as the modulation of the EPC by repetitive UVA stimulation both forming the skin protection capacity (SPC). Results: The SPC showed a strong dependency on the UVA dose used for stimulation. AO pretreatment was more effective against lower UVA doses. Over the course of 4 days, the AO-induced SPC did not change significantly for a given UVA dose. Analyzing the decay curve intersection point for 2 different UVA doses, however, revealed a decrease in SPC with time. In addition, we found that a repetitive UVA irradiation of 1 J/cm2 caused a statistically significant protective effect against UVA irradiation by stimulation of endogenous mechanisms. Conclusion: Topically supplemented AOs provide a protective effect against oxidative stress for at least 3 days, supporting their widespread use in cosmetic products. Especially their interaction with cutaneous protective mechanisms should be investigated in more detail for maximal protection, as endogenous defense mechanisms are already triggered by 2 low-dose UVA irradiations within 24 h. In summary, the in vivo measurement of UVA-induced cutaneous chemiluminescence permits the UVA-dose-independent determination of the AO efficacy for better comparability of the results while also taking endogenous defense mechanisms into account.

© 2011 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: August 16, 2010
Accepted: March 22, 2011
Published online: July 15, 2011
Issue release date: September 2011

Number of Print Pages: 5
Number of Figures: 3
Number of Tables: 1

ISSN: 1660-5527 (Print)
eISSN: 1660-5535 (Online)

For additional information: http://www.karger.com/SPP


Copyright / Drug Dosage / Disclaimer

Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher or, in the case of photocopying, direct payment of a specified fee to the Copyright Clearance Center.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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