福建36选7开奖方式: 福建36选7第18123期

通过治疗僵尸细胞 有望延缓人体衰老进程

时间:2019-06-04 22:38来源:互联网 提供网友:nan   字体: [ ]
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福建36选7第18123期 www.pysue.com  ‘Zombie Cells’: Researchers Fight Aging Process of the Human Body

Creatures that refuse to die, commonly known as zombies, have appeared in popular movies and television shows for years.

Recent research has shown that an unusual part of real human biology possesses zombie-like qualities: a special kind of cells.

Like the stars of many scary stories, these so-called ‘zombie cells’ also refuse to die. Studies suggest that, as they build up in your body, they lead to aging and the conditions that come with that process, like bone and brain diseases.

Now, researchers are studying drugs that can kill zombie cells and possibly treat the problems they bring.

James Kirkland is a medical doctor and aging specialist with the Mayo Clinic in Rochester, Minnesota. He is working on the research. He told the Associated Press that, generally, the goal is to fight aging itself. This in turn may delay the appearance of some age-related disease and disabilities.

The research has been done mainly in mice. Earlier this year, the first test on people was published and provided some interesting results.

Zombie cells are actually called senescent cells. They start out like usual cells, but then face problems, like viral infection or damage to their genetic1 material (DNA). At that point, a cell may die or become a zombie cell – entering a state of suspended animation2.

These zombie cells release chemicals that can harm nearby normal cells. That is where the trouble starts.

What kind of trouble? In studies on mice, drugs that destroy zombie cells — called senolytics — have been shown to improve many different conditions. This includes cataracts3, diabetes4, enlargement of the heart, kidney problems, and age-related muscle loss.

Mouse studies have also shown a more direct tie between zombie cells and aging. When drugs targeting those cells were given to older mice, the animals showed improved walking speed, strength and an ability to continue physical activity. Even when researchers used the treatment on very old mice, it extended their lifespan by about 36 percent.

Researchers have also shown that putting zombie cells into young mice generally made them act older. Their walking speed slowed down. Their muscle strength and ability to stay active also decreased. Tests showed the newly added cells changed other cells into the zombie state.

This year, Kirkland and his team published the first study of a zombie-cell treatment in people. It involved 14 patients with idiopathic pulmonary fibrosis, an often deadly lung disease. Risk of the disease rises with age, and patients’ lungs show evidence of zombie cells.

After three weeks of treatment, patients who took part in the experiment improved on some measures of physical health, like walking speed. Other measures did not show improvement.

Gregory Cosgrove is a doctor and chief medical officer of the Pulmonary Fibrosis Foundation. He was not involved in the study. He noted5 that, overall, the results are a good sign.

“It really raises enthusiasm to proceed with the more rigorous studies,” Cosgrove said.

The field of zombie cell research is still young. But Kirkland estimates at least 12 companies have formed or launched efforts to study treatments.

Laura Niedernhofer is a professor of biochemistry at the University of Minnesota in Minneapolis. She suggested that, in addition to age-related diseases, anti-zombie cell drugs might be useful for treating early aging among cancer survivors6. This condition brings on the early appearance of some diseases.

Niedernhofer said the goal is not to prevent damaged cells from turning into zombies, because they may become cancerous instead. The aim is to kill cells that have already changed, or to limit the harm they do.

And what about giving them to healthy people who want to prevent aging? That is possible but a long way off, after studies have established that the drugs are safe enough, Niedernhofer said.

Kirkland added, “We may not get there.”

In any case, experts do support the research so far. George Kuchel, a doctor with the University of Connecticut Center on Aging in Farmington, found the results very interesting.

Nir Barzilai is a researcher of aging at the Albert Einstein College of Medicine in New York. He believes treating zombie cells will play a part in the overall effort to delay, stop and maybe even undo7 aging.

I’m Bryan Lynn.

Words in This Story

mice – n. very small animals that have pointed8 noses and long, thin tails

suspended animation – n. a state in which the processes of the body, such as blood circulation, stop or become very slow for a period of time while a person or animal is unconscious

cataract(s) – n. a condition in which a part of your eye called the lens becomes cloudy and you cannot see well

diabetes – n. a serious disease in which the body cannot properly control the amount of sugar in your blood because it does not have enough insulin

enthusiasm – n. a strong feeling of active interest in something that you like or enjoy

rigorous – adj. done carefully and with a lot of attention to detail


点击收听单词发音收听单词发音  

1 genetic PgIxp     
adj.遗传的,遗传学的
参考例句:
  • It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
  • Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
2 animation UMdyv     
n.活泼,兴奋,卡通片/动画片的制作
参考例句:
  • They are full of animation as they talked about their childhood.当他们谈及童年的往事时都非常兴奋。
  • The animation of China made a great progress.中国的卡通片制作取得很大发展。
3 cataracts a219fc2c9b1a7afeeb9c811d4d48060a     
n.大瀑布( cataract的名词复数 );白内障
参考例句:
  • The rotor cataracts water over the top of the machines. 回转轮将水从机器顶上注入。 来自《现代英汉综合大词典》
  • Cataracts of rain flooded the streets. 倾盆大雨弄得街道淹水。 来自辞典例句
4 diabetes uPnzu     
n.糖尿病
参考例句:
  • In case of diabetes, physicians advise against the use of sugar.对于糖尿病患者,医生告诫他们不要吃糖。
  • Diabetes is caused by a fault in the insulin production of the body.糖尿病是由体內胰岛素分泌失调引起的。
5 noted 5n4zXc     
adj.著名的,知名的
参考例句:
  • The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
  • Jim is noted for arriving late for work.吉姆上班迟到出了名。
6 survivors 02ddbdca4c6dba0b46d9d823ed2b4b62     
幸存者,残存者,生还者( survivor的名词复数 )
参考例句:
  • The survivors were adrift in a lifeboat for six days. 幸存者在救生艇上漂流了六天。
  • survivors clinging to a raft 紧紧抓住救生筏的幸存者
7 undo Ok5wj     
vt.解开,松开;取消,撤销
参考例句:
  • His pride will undo him some day.他的傲慢总有一天会毁了他。
  • I managed secretly to undo a corner of the parcel.我悄悄地设法解开了包裹的一角。
8 pointed Il8zB4     
adj.尖的,直截了当的
参考例句:
  • He gave me a very sharp pointed pencil.他给我一支削得非常尖的铅笔。
  • She wished to show Mrs.John Dashwood by this pointed invitation to her brother.她想通过对达茨伍德夫人提出直截了当的邀请向她的哥哥表示出来。
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