Scientists find mechanism of UV light-induced skin aging

SEOUL, June 2 (Yonhap) -- South Korean scientists said Thursday that they have discovered the mechanism of skin aging stemming from long exposure to ultraviolet (UV) light.
A Seoul National University research team led by dermatology professor Chung Jin-ho said tests conducted on human volunteers showed UV light adversely hinders fat being absorbed by human subcutaneous tissue and that this process hastens the aging of skin.
The discovery marks the first time that science has shed light on what many people suspected but could not prove.
Chung said UV light, which is a form of electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays, does not directly reach the subcutaneous region deep under the skin.
He, however, said light causes the secretion of IL-6, MCP-3 and PIGF proteins from the epidermal, or surface of skin, which hinders fat absorption.
"Hindering fat abortion causes exposed skin to lose texture and volume as well as bringing about wrinkles and freckles," the researcher said.
He said tests conducted on 12 people clearly showed that UV light can cause fat absorption to fall by as much as 40 percent in some cases.
Tests were conducted by exposing certain parts of the skin to high levels of UV light and protecting other areas from exposure.
"Because we now know why skin aging takes place, more research may help find ways to develop special cosmetic products that can offset such developments," the professor said.
The latest discovery is expected to be published in the U.S.-based Journal of Investigative Dermatology.
yonngong@yna.co.kr