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UV, sichtbares Licht, Infrarot

Welche Wellenlängen produzieren oxidativen Stress in menschlicher Haut?

UV, visible and infrared light

Which wavelengths produce oxidative stress in human skin?

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Zusammenfassung

Es wird experimentell gezeigt, dass die Bildung von freien Radikalen – hauptsächlich reaktiven Sauerstoffspezies (ROS) – die allgemeine photobiologische Antwort für die Haut-Sonnenlicht-Wechselwirkung darstellt. Das freie Radikal-Aktionsspektrum (Wellenlängenabhängigkeit) für ultraviolettes und sichtbares Licht (280–700 nm) wird mittels quantitativer ESR bestimmt. Sichtbares Licht produziert etwa 50% des totalen oxidativen Stresses, generiert durch Sonnenlicht. Wie in den anderen Bereichen können hoch reaktive •O- 2-, •OH- und •CHR-Radikale in dieser Region identifiziert werden. Die Menge der erzeugten Radikale korreliert mit der Beleuchtungsstärke (Lux), die auf der Haut erreicht wird. Die Erzeugung freier Radikale durch nahes Infrarot (NIR, 700–1600 nm) in menschlicher Haut wird gezeigt. Die Radikalgenerierung ist von der Bestrahlungsstärke und der durch das NIR in der Haut induzierten stationären Temperatur abhängig. Die Temperaturabhängigkeit der Radikalbildung folgt der physiologischen Fieberkurve des Menschen. Über das gesamte aktive Sonnenspektrum werden im menschlichen Hautgewebe freie Radikale des gleichen Typs erzeugt. Der Bereich der schädlichen oder nützlichen Wirkung von Sonnenlicht definierter Qualität könnte künftig durch die Einführung eines Schwellenwertes für freie Radikale in der menschlichen Haut charakterisiert werden.

Abstract

Experimental evidence suggests that the creation of free radicals – mainly reactive oxygen species (ROS) – is the common photobiological answer to the skin-sunlight interaction. The free radical action spectrum (wavelength dependency) for ultraviolet and visible light (280–700 nm) has been determined by quantitative ESR spectroscopy. Visible light produces around 50% of the total oxidative stress caused by sunlight. Reactive species like •O- 2, •OH and •CHR are generated by visible light. The amount of ROS correlates with the visible light intensity (illuminance). We demonstrated the creation of excess free radicals by near-infrared light (NIR, 700–1600 nm). Free radical generation does not depend exclusively on the NIR irradiance, but also on the NIR initiated skin temperature increase. The temperature dependence follows the physiological fever curve. Our results indicate that the complex biological system skin creates the same type of free radicals over the entire active solar spectrum. This general response will make it possible to define the beneficial or deleterious action of sunlight on human skin by introduction of a free radical threshold value.

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Authors and Affiliations

  1. Coty /Lancaster SAM, International R&D Center, 2 rue de la Lüjernetta, 98000, Monaco, Monaco

    L. Zastrow & L. Ferrero

  2. Privatinstitut Galenus GmbH, Berlin, Deutschland

    N. Groth & F. Klein

  3. UV-Technik, Hanau, Deutschland

    D. Kockott

  4. Department of Dermatology, Center of Experimental and Applied Cutaneous Physiology, Charité-Universitätsmedizin, Berlin, Deutschland

    J. Lademann

Authors
  1. L. Zastrow
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  2. N. Groth
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  3. F. Klein
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  4. D. Kockott
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  5. J. Lademann
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  6. L. Ferrero
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Correspondence to L. Zastrow.

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Zastrow, L., Groth, N., Klein, F. et al. UV, sichtbares Licht, Infrarot. Hautarzt 60, 310–317 (2009). https://doi.org/10.1007/s00105-008-1628-6

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