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Rays Anatomy.(Brief article)
Byline: KRISTIN SAINANI
Sunburn and wrinkles are obvious effects of exposure to ultraviolet rays--but other forms of damage are insidious and invisible. Now, scientists are learning exactly what happens inside sun-exposed skin and devising new ways to intervene.
TANNING AND SUNBURN UV rays trigger free radicals that can harm skin cells. In as few as 20 minutes for pale skin in intense sunlight, the damage can set off a wound-healing response: The body sends immune cells and blood to the skin, causing inflammation and redness, or sunburn, says Gary J. Fisher, professor of dermatology at the University of Michigan.
DNA DAMAGE Structural changes occur in many skin cells' DNA in less than one second of contact with UV light. The cells are able to fix most of these defective segments, but some become permanent mutations, says Thomas M. Ruenger, professor of dermatology at Boston University School of Medicine. In a study, a properly applied broad-spectrum SPF 15 sunscreen reduced this damage to undetectable levels in 99 percent of UV-exposed ...
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