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

ed epidermal thickness, but again, this result was more pronounced in the UVB group.

There were differences between the UVB and UVB+HO groups on a molecular level, as well. The level of HIF-1α increased significantly in the UVB group compared to the control group, whereas there was no significant increase in the UVB+HO group. VEGF levels increased in both the UVB and the UVB+HO groups, but the UVB+HO group experienced a smaller increase. This implies that oxygen and the excess amount of oxygen in body tissue, or hyperoxia, that it provides can lessen skin damage and wrinkling caused by UVB radiation.

A Surprising Result

The study had one surprising result, as well, one involving molecules called matrix metalloproteinases (MMPs). Like HIF-1 α and VEGF, they play a role in angiogenesis. Two MMPs in particular, MMP-2 and MMP-9, are thought to accelerate wrinkling by degrading the outer components of cells. However, in this study, MMP-2 levels tended to decrease with exposure to UVB radiation and MMP-9 levels remained the same, even in mice who did not receive oxygen. According to the researchers, this implies that MMP-2 and MMP-9 are not main factors in wrinkle formation and angiogenesis, at least in the early stages of skin damage caused by UVB radiation.

The implications for humans remain to be seen, and the researchers note that further studies are required. In the meantime, the best way to avoid wrinkles caused by UVB radiation is to wear sunscreen.


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Contact: Donna Krupa
DKrupa@the-aps.org
301-634-7209
American Physiological Society
Source:Eurekalert

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