1、Hello everyone. My name is He Jiana, majoring in Chinese medicine. Today my topic is Could This Be the Fountain of Youth for Mice and Men? It is concerning a protein, called GDF11. Before my speech, lets review some words and phrases. Could young blood be the answer to cheating death? It is a hypoth
2、esis that young blood can make life forever or keep the body young. It may sound like the story in a vampire movie but now there is scientific research that supports the theory. U.S. scientists have discovered a protein in the blood in young mice that can undo some effects of aging in old mice. The
3、same protein is present in human blood and might one day help us lead healthier lives. Two papers published in the journal Science discuss this protein, called GDF11. Researchers at Harvard University in Cambridge, Massachusetts explain how GDF11 improved the brain and muscle ability of older mice.
4、This protein is found in high levels in the blood of young mice. And it appears to help develop new blood vessels. In one experiment, the scientists increased the levels of G DF11 in aging mice by surgically connecting the blood flow systems of young mice to the old mice. Blood containing higher lev
5、els of GDF11 flowed among both groups. In another experiment, they injected the protein into old mice. Scientists saw the greatest change in the old mice that shared blood flow with the young. The old mice formed new blood vessels. The animals blood flow improved. And the aging process changed direc
6、tions, or reversed, in every tissue the researchers observed. Researcher Lee Rubin is a professor of stem cell research at Harvards Stem Cell Institute. His team looked at the effect of GDF11 on brain tissue. “So, this simple surgery, connecting an old mouse with young blood, actually produced some
7、structural changes in the old brain, making the old brain, in essence, more like (a) young brain. And some people have used the phrase rejuvenating the old brain. And similar things were observed in other tissues.“ Rubins teammate Amy Wagers said that GDF11 repaired DNA damage linked to aging. Wager
8、s said earlier GDF11 research showed a change in the weakened hearts of older mice. The hearts returned to a more youthful size and beat more efficiently. So, this is great news for old mice. But what does it mean for us? There is growing hope GDF11 might someday repair and renew unhealthy human hea
9、rts. Also, Mr. Rubin says the protein might improve memory power for Alzheimers patients or physical movement for people with Parkinsons disease. But the researcher says the protein is not a “fountain of youth.“ He says the aim of the research is not to lengthen life as much as to improve it. In oth
10、er words, even if you did not live more years, at least you could remain healthier for the number of years you do live. And I think again, what weve shown is functional improvement in . various different tissues in mice. Researchers at Stanford University in California are doing similar research. Th
11、ey report that blood from young mice improved brain operations in older mice. Researchers in Massachusetts and California are working with technology companies that specialize in human medicine to see how these findings can help humans. Harvard Universitys Lee Rubin predicts human testing could begin in as little as three years.
侵权处理QQ：3464097650--上传资料QQ：3464097650
【声明】本站为“文档C2C交易模式”，即用户上传的文档直接卖给（下载）用户，本站只是网络空间服务平台，本站所有原创文档下载所得归上传人所有，如您发现上传作品侵犯了您的版权，请立刻联系我们并提供证据，我们将在3个工作日内予以改正。