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Hyperoxia may slow formation of wrinkles
Date:6/29/2010

Bethesda, Md. (June 29, 2010) It's no secret that UVB radiation from the sun causes wrinkles. However, a Japanese study published in the American Journal of PhysiologyRegulatory, Integrative and Comparative Physiology (http://ajpregu.physiology.org/) indicates that oxygen may help combat the formation of wrinkles by lessening tissue damage done by UVB rays.

In the study, mice who were placed in an oxygen chamber after exposure to UVB radiation developed fewer wrinkles and showed fewer signs of tissue damage than mice who were exposed to UVB radiation alone.

UVB and Skin Damage

The readily visible hallmarks of skin damage are wrinkles and a thickening in the outer layer of skin, the epidermis. Together they make skin look and feel leathery.

The "sun-weathered" look is merely evidence of what is happening on a molecular level beneath the skin's surface, however. When skin is repeatedly exposed to UVB radiation, new blood vessels form from existing blood vessels in the skin in a process called cutaneous angiogenesis. Several transcription factorsproteins that bind to specific DNA sequencesplay a role in angiogenesis, including hypoxia inducible factor (HIF-1) and its subunit HIF-1 α and vascular endothelial growth factor (VEGF).

The Study

In the study, the researchers assigned 24 hairless mice into three groups. The control group, the UVB group, and the UVB+HO group. The control group was not exposed to UVB radiation. Both the UVB and the UVB+HO groups were exposed to UVB radiation by a special fluorescent lamp three times per week for five weeks, but the UVB+HO mice were placed in an oxygen chamber for two hours after each irradiation.

Over the five weeks, the mice in the UVB and UVB+HO groups developed wrinkles, but the wrinkles were more pronounced in the UVB group. Likewise, both the UVB and UVB+HO group experienced increas
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Contact: Donna Krupa
DKrupa@the-aps.org
301-634-7209
American Physiological Society
Source:Eurekalert

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