Blondes and redheads not only are more susceptible to skin cancer, but the source of their skin and hair pigmentation, melanin, actually magnifies the damaging effects of ultraviolet (UV) rays, according to a study published online this week in the Proceedings of the National Academy of Sciences.
Melanin filters out UV radiation, but the melanin in hair follicles, particularly in light hair, actually increases the sun damaging effects of UV rays and causes cell death in the hair follicle, said Douglas Brash, principal investigator and professor of therapeutic radiology, genetics and dermatology at Yale School of Medicine.
Brash said he had been curious why people with dark hair and fair skin were not as vulnerable to skin cancer as fair skinned blondes and redheads. "I wondered if it was related to the melanin," he said. Brashs laboratory used mice engineered with pigmentation for yellow or black hair, as well as albino mice with no pigment at all. The researchers then irradiated the mice with UV rays that are about the same as what breaks through the ozone layer, affecting humans.
Jacqueline Weaver | EurekAlert!
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