New sun screen can automatically darken skin

September 22 publication of "natural" in a magazine report, A new sun screen can not only make your skin becomes sun off bronze, but also to prevent skin cancer. Research indicates that sun screen on rats very useful, if mankind is to have the same effect, then can tell the white beauties pursuit bronze at the same time. also avoid excessive exposure to UV damage genes and trigger skin cancer. Boston Dana Burton Act Cancer Institute's David Fischer is responsible for the study. Its research carried out in two stages, they all know black skin, black hair cells of the rat is how to let the skin into bronze. Know the mechanism, the researchers used this approach for the red hair white mouse skin into bronze. UV radiation can produce skin melanoma, but the over-exposure of skin cancer resulting previous studies show that There are two bronze skin and skin cells, a cell close to the surface of the skin, called keratinocytes; Another cells in the depths of some skin, called melanocytes. Other studies have shown that when the skin when ultraviolet radiation, UV will be deep into the melanocytes and activate it, let it produce melanin. When melanoma reached above the keratinocytes, in melanoma cell dna will be formed above a huge arc, protect it from UV damage. When the skin into bronze, will be able to see this melanoma. The researchers found this mechanism, but the work is only half complete. Their research shows that when ultraviolet radiation skin, it will not directly reach deeper melanocytes. but first with the surface of keratinized cells, these cells release hormones, This hormone and lower melanocytes linked. So, this hormone is the melanocytes produce melanin protection of the signal. Researchers said that the white color of Europe and the United States were not easy for this hormone activation melanocytes, therefore, They are not easy to be sun tanning, in order to achieve bronze color effects are often over-exposure. lead to skin cancer is increasing. Drug voluntarily skin cream, "black America" to avoid the "black America" and the sunlight exposure to the adverse consequences, Scientists developed a drug cream, which can activate melanocytes produce melanin. When they Tu of the drug to rats hair red skin, even in the absence of UV irradiation, Rats color has become a bronze. Fischer said that the traditional sunscreen products only as dyes, only to the increase in skin color, and protect the skin from ultraviolet damage. This drug can be produced through normal channels hormone activation melanocytes produce melanin. When the scientists compared rats red hair and black hair bronze rat skin cells, They found the drug to stimulate melanoma skin and black mouse melanoma naturally produced different. The former can protect the skin against radiation injury, and anti - ultraviolet radiation effects can be as long as several months. By comparison, the Tu-off drug solar insolation white mouse skin remains healthy, no sun and the inflammation and symptoms of keratosis, but not the white mice hadn will suffer more. New drugs can not replace sun block Fischer, Although the dark skin of such drugs can choose white people, to protect their skin from sun damage. However, it is not to replace the use of sun block. He said that this study did not indicate let people stop using sun block, he did not suggest that allow people to reconsider the use of sun block, but to let people understand more about skin protection knowledge, because their protection is still far from comprehensive.