茶霜或可对抗皮肤癌

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最近的研究表明,茶可以保护心脏并对抗口臭。现在研究人员报告称,茶也可能有助于预防皮肤癌。他们说,局部使用时,红茶和绿茶中被称为多酚的成分可以抑制暴露于紫外线的小鼠皮肤中癌症的发展。

来自太阳的紫外线众所周知会引发不受控制的细胞增殖,从而可能导致癌症。防晒霜通过物理阻挡紫外光子来防止太阳的有害射线。新的研究结果表明,相比之下,茶多酚可以中断导致皮肤癌的化学途径,从而提供暴露后保护。明尼苏达大学奥斯汀分校的董志刚和他的同事发现,与未接受多酚治疗的小鼠相比,暴露于 UVB 光,然后用绿茶多酚溶液擦拭的剃光实验鼠表现出较低水平的促癌酶和蛋白质。(红茶含有类似的多酚。)

其他研究暗示,饮茶可能阻止皮肤癌,但昨天在纽约市举行的美国化学学会会议上展示新发现的董志刚认为,局部应用茶多酚可能是一种更好的方法。“饮茶可能有所帮助,但你必须喝大量茶才能在皮肤中积累,可能每天多达 10 杯,”他指出。“以乳霜形式浓缩它更容易,而且可能更有效。”该团队目前正在努力开发这样一种多酚乳液,人体试验可能在几年后开始。

Kate Wong is an award-winning science writer and senior editor at 大众科学 focused on evolution, ecology, anthropology, archaeology, paleontology and animal behavior. She is fascinated by human origins, which she has covered for more than 25 years. Recently she has become obsessed with birds. Her reporting has taken her to caves in France and Croatia that Neandertals once called home, to the shores of Kenya's Lake Turkana in search of the oldest stone tools in the world, to Madagascar on an expedition to unearth ancient mammals and dinosaurs, to the icy waters of Antarctica, where humpback whales feast on krill, and on a "Big Day" race around the state of Connecticut to find as many bird species as possible in 24 hours. Kate is co-author, with Donald Johanson, of Lucy's Legacy: The Quest for Human Origins. She holds a bachelor of science degree in biological anthropology and zoology from the University of Michigan. Follow Wong on X (formerly Twitter) @katewong

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