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皮肤也有感光能力 害怕晒伤 - 站长搜索
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皮肤也有感光能力 害怕晒伤

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2015-05-28 19:45:07 转载来源: 网络整理/侵权必删

当你走到太阳下,感受阳光的不只是你的双眼。你的皮肤也与视网膜一样含有光感受器,从而能够迅速对有害的紫外线辐射采取防御

当你走到太阳下,感受阳光的不只是你的双眼。你的皮肤也与视网膜一样含有光感受器,从而能够迅速对有害的紫外线辐射采取防御。

皮肤通过产生黑色素而变黑,黑色素可以保护DNA不受紫外线的损伤。我们已经知道,在被太阳暴晒几天后,阳光中的UVB紫外线才会使皮肤增加黑色素的产生,以应对皮肤中的DNA损伤。但是,阳光中的UVA紫外线却可以在几分钟内就促进黑色素的产生。

布朗大学的埃琳娜・万恰和同事认为他们知道其中的原因。他们分析了负责生产黑色素的黑素细胞的基因表达,发现这些细胞也能产生视紫红质,即存在于视网膜中的光敏物质。

当研究小组用UVA紫外线照射黑素细胞时,他们发现黑色素分泌量有所上升。在24小时内,黑色素的分泌增加了4倍。而去掉黑素细胞中负责分泌视紫红质的基因,也就阻断了其对

UVA紫外线的这种即刻反应能力。万恰认为,这种即刻“变黑”的过程尽管不那么明显,却可以帮助保护皮肤抵御早期的DNA受损。

不过,澳大利亚昆士兰大学的里克・斯特姆并不相信皮肤“看到”阳光的功能可以使之获得很大程度的保护。他说:“即刻变黑并不能抵御紫外线引起的晒伤或DNA损伤。”

标签: 皮肤 也有 感光 能力 害怕 晒伤


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