美国国家公共电台 NPR 'Minibrains' Could Help Drug Discovery For Zika And For Alzheimer's
时间:2019-01-16 作者:英语课 分类:2016年NPR美国国家公共电台11月
'Minibrains' Could Help Drug Discovery For Zika And For Alzheimer's
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Some tiny brains are making big news this week at the world's largest neuroscience meeting. Minibrains are these lab-created clusters of living human brain cells that mimic 2 some of the functions of actual, fully 3 developed brains. As NPR's Jon Hamilton reports, they are helping 4 scientists answer questions about everything from early brain development to infection with the Zika virus.
JON HAMILTON, BYLINE 5: Unlike real brains, minibrains are made in laboratories - labs like this one at Johns Hopkins University in Baltimore. Hongjun Song, the scientist in charge, takes me to a small, windowless room with a powerful air filtration system. He opens an incubator the size of a dorm fridge and points inside.
HONGJUN SONG: So this is the device we've developed.
HAMILTON: The device is only a bit larger than a cell phone, but Song says it's a complete minibrain factory. The lower half looks like a miniature muffin pan with a dozen separate compartments 6.
SONG: Yeah, we can grow up to five to 10 minibrain in each one.
HAMILTON: These minibrains aren't just random 7 clumps 8 of human brain cells. They contain many of the structures and connections found in real brains. And figuring out how to grow them has taken a lot of work. About three years ago, scientists in Europe showed how to coax 9 brain cells into specializing and organizing much the way a developing brain does. The Hopkins team has streamlined and improved the process. Guo-Li Ming, a professor at Hopkins, says each minibrain is just big enough to see with the naked eye.
GUO-LI MING: It's basically, like, a ball of cells clustering together. But if you open it up, you really see something very similar to the early embryonic 10 brain.
HAMILTON: It's not just that they look like embryonic brains. They also grow the way a brain does in the womb. And that led to a big discovery with a minibrain just a few months ago. It involved the Zika virus, which was suspected of derailing brain development in early pregnancy 11. Ming says she and Hongjun Song, who are married, thought their minibrains might offer a way to figure out what was happening. And by chance, the couple knew a researcher at Florida State University who was studying the Zika virus.
MING: So Hongjun called him right away, saying, well, we have the perfect system to work. Do you have the Zika? And he said yes.
HAMILTON: That call led to experiments in minibrains that showed how the infection was attacking certain critical brain cells. The Hopkins team described this research Sunday during a press conference at the Society for Neuroscience meeting in San Diego. Elsewhere at the meeting, scientists are presenting minibrain research on a range of other diseases and disorders 12, including brain cancer and Down syndrome 13. Thomas Hartung from Hopkins Bloomberg School of Public Health says minibrains may offer a better way for drug companies to test new products.
THOMAS HARTUNG: One company after the other failed on things like stroke, multiple sclerosis, but also new degenerative diseases, like Alzheimer's and Parkinson's.
HAMILTON: Those drugs worked on animals but failed with people. Hartung says that's because animal brains aren't like human brains.
HARTUNG: We need human systems to tell us about humans, and that's why this is such a big step forward.
HAMILTON: One potential obstacle for minibrain research is public acceptance. Hartung says when people hear about scientists growing brains in a lab, they sometimes imagine a fully functioning organ. And in some ways, he says, the clusters are like real brains.
HARTUNG: These cells are communicating. These neurons are talking to each other. You could say it's a primitive 14 type of thinking.
HAMILTON: But Hartung says these brains contain thousands of cells, not billions like a real brain. And even if they could get bigger, they wouldn't be conscious.
HARTUNG: This has nothing to do with consciousness. This has nothing to do with any type of information which is digested here by these cells because they have no input 15.
HAMILTON: So they don't have anything to think about. Jon Hamilton, NPR News.
- View edits in a web browser.在浏览器中看编辑的效果。
- I think my browser has a list of shareware links.我想在浏览器中会有一系列的共享软件链接。
- A parrot can mimic a person's voice.鹦鹉能学人的声音。
- He used to mimic speech peculiarities of another.他过去总是模仿别人讲话的特点。
- The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气,然后全部呼出。
- They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。
- The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
- By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
- His byline was absent as well.他的署名也不见了。
- We wish to thank the author of this article which carries no byline.我们要感谢这篇文章的那位没有署名的作者。
- Your pencil box has several compartments. 你的铅笔盒有好几个格。 来自《简明英汉词典》
- The first-class compartments are in front. 头等车室在前头。 来自《简明英汉词典》
- The list is arranged in a random order.名单排列不分先后。
- On random inspection the meat was found to be bad.经抽查,发现肉变质了。
- These plants quickly form dense clumps. 这些植物很快形成了浓密的树丛。 来自《简明英汉词典》
- The bulbs were over. All that remained of them were clumps of brown leaves. 这些鳞茎死了,剩下的只是一丛丛的黃叶子。 来自《简明英汉词典》
- I had to coax the information out of him.我得用好话套出他掌握的情况。
- He tried to coax the secret from me.他试图哄骗我说出秘方。
- It is still in an embryonic stage.它还处于萌芽阶段。
- The plan,as yet,only exists in embryonic form.这个计划迄今为止还只是在酝酿之中。
- Early pregnancy is often accompanied by nausea.怀孕早期常有恶心的现象。
- Smoking during pregnancy increases the risk of miscarriage.怀孕期吸烟会增加流产的危险。
- Reports of anorexia and other eating disorders are on the increase. 据报告,厌食症和其他饮食方面的功能紊乱发生率正在不断增长。 来自《简明英汉词典》
- The announcement led to violent civil disorders. 这项宣布引起剧烈的骚乱。 来自《简明英汉词典》
- The Institute says that an unidentified virus is to blame for the syndrome. 该研究所表示,引起这种综合症的是一种尚未确认的病毒。
- Results indicated that 11 fetuses had Down syndrome. 结果表明有11个胎儿患有唐氏综合征。
- It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
- His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。