Scientists have found that the skin uses the photosensitive function to prevent sun damage
When you walk under the sun, it is not just your eyes that feel the sun. Your skin also contains photoreceptors just like the retina, so you can quickly defend against harmful ultraviolet radiation.
The skin turns black by producing melanin, which protects DNA from ultraviolet rays. We already know that after being exposed to the sun for a few days, the UVB ultraviolet light in the sun will increase the production of melanin in the skin to deal with the DNA damage in the skin. However, the UVA ultraviolet rays in sunlight can promote the production of melanin in a few minutes.
Elena Wancha and colleagues at Brown University think they know the reason. They analyzed the gene expression of melanocytes responsible for melanin production and found that these cells also produce rhodopsin, a light-sensitive substance present in the retina.
When the research team irradiated melanocytes with UVA, they found that melanin secretion increased. Within 24 hours, the secretion of melanin increased 4 times. The removal of the gene responsible for the secretion of rhodopsin in the melanocytes also blocked its
The immediate reaction ability of UVA ultraviolet rays. Wan Qia believes that this immediate "blackening" process, although less obvious, can help protect the skin from early DNA damage.
However, Rick Sturm of the University of Queensland in Australia does not believe that the skin's function of "seeing" sunlight can give it a great degree of protection. He said: "Immediate blackening does not protect against sunburn or DNA damage caused by ultraviolet rays."
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