茶霜或可對抗皮膚癌

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最近的研究表明,茶可以保護心臟並對抗口臭。現在研究人員報告稱,茶也可能有助於預防皮膚癌。他們說,區域性使用時,紅茶和綠茶中被稱為多酚的成分可以抑制暴露於紫外線的小鼠皮膚中癌症的發展。

來自太陽的紫外線眾所周知會引發不受控制的細胞增殖,從而可能導致癌症。防曬霜透過物理阻擋紫外光子來防止太陽的有害射線。新的研究結果表明,相比之下,茶多酚可以中斷導致皮膚癌的化學途徑,從而提供暴露後保護。明尼蘇達大學奧斯汀分校的董志剛和他的同事發現,與未接受多酚治療的小鼠相比,暴露於 UVB 光,然後用綠茶多酚溶液擦拭的剃光實驗鼠表現出較低水平的促癌酶和蛋白質。(紅茶含有類似的多酚。)

其他研究暗示,飲茶可能阻止皮膚癌,但昨天在紐約市舉行的美國化學學會會議上展示新發現的董志剛認為,區域性應用茶多酚可能是一種更好的方法。“飲茶可能有所幫助,但你必須喝大量茶才能在皮膚中積累,可能每天多達 10 杯,”他指出。“以乳霜形式濃縮它更容易,而且可能更有效。”該團隊目前正在努力開發這樣一種多酚乳液,人體試驗可能在幾年後開始。

Kate Wong is an award-winning science writer and senior editor at 大眾科學 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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