日本无限资源_福禄影院午夜伦_美国av毛片_亚洲自拍在线观看_激情亚洲一区国产精品_999久久久久

Virus can boost, not weaken, immune system: study

Source: Xinhua| 2018-07-03 03:17:07|Editor: Li Xia
Video PlayerClose

WASHINGTON, July 2 (Xinhua) -- American scientists have identified a particular virus in mice model that may not weaken, but enhance the immune system, according to a study published Monday in the Proceedings of the National Academy of Sciences.

"Our immune system is at its peak when we're young, but after a certain age, it declines and it becomes more difficult for our bodies to fight off new infections," the report said.

In search of a way to rejuvenate the immune system of older adults, the researchers infected mice with the cytomegalovirus (CMV).

This virus affects more than half of all individuals and is contracted, for most part, at a young age. Because there is no cure, the virus is carried for life, and is particularly prevalent in older adults.

"CMV doesn't usually cause outward symptoms, but we still have to live with it every day since there's no cure," said Megan Smithey, a researcher at Janko Nikolich-Zugich's lab in the University of Arizona Center on Aging. "Our immune system always will be busy in the background dealing with this virus."

"We assumed it would make mice more vulnerable to other infections because it was using up resources and keeping the immune system busy," said Smithey.

However, when infected with listeria, old mice carrying CMV proved to be tougher than old mice without CMV, to the surprises of the researchers.

Then, they examined the mice's T-cells, the army of defenders that fights off infection, and found that groups of older mice had a decent supply of diverse T-cells.

"Diversity is good," said Nikolich-Zugich. "Different types of T-cells respond to different types of infections; the more diverse T-cells you have, the more likely you'll be able to fight off infections."

For years, scientists assumed that T-cell diversity decreased as we age. This was one of the reasons why older adults succumbed to disease more easily.

However, the new study showed that T-cells were almost as diverse in old mice as they were in young mice. "This study shows us that there is more capacity in the immune system at an older age than we thought," said Smithey.

Nikolich-Zugich explained, "It's as if CMV is issuing a signal that gets the best defenses out onto the field."

"This shows that the ability to generate a good immune response exists in old age and CMV, or the body's response to CMV, can help harness that ability," said Smithey.

The team's goal is to create a vaccine that can improve the immune system of older adults and protect against infection.

TOP STORIES
EDITOR’S CHOICE
MOST VIEWED
EXPLORE XINHUANET
010020070750000000000000011100001372968681
主站蜘蛛池模板: 亚洲最大在线 | 精精精精xxxx免费视频 | 91久久国产综合久久91猫猫 | 日韩在线观看中文 | 成年男人的天堂 | 中文字幕久久精品波多野结百度 | 扒丝袜网www午夜一区二区三区 | 欧美一区二区三区四区视频 | 波多野结衣在线观看中文字幕 | 亚洲福利在线看 | 欧美疯狂xxxxbbbb动态图 | 国产美女网站视频 | 国产三级在线观看播放 | jizz大全日本护士喷奶水 | 99精品乱码国产在线观看 | 精品视频免费 | 亚洲一卡二卡三卡四卡无卡网站 | 麻豆爱爱| 曰韩观看免费 | 粉嫩一区二区性色av97 | av免费在线不卡 | 狠狠综合久久久久尤物丿 | 把护士强奷到舒服的动态图 | 国产黄色网址大全 | 性饥渴少妇XXXXⅩHD | 91无毛| 亚洲综合熟女久久久40P | 冲田杏梨一区二区三区 | 在线观看啊啊啊啊啊 | 国产精品一区在线观看 | 一区二区三区中文字幕在线 | 狠狠躁18三区二区一区 | 久久精品国产99久久丝袜 | 久久精品国产一区二区三 | 亚洲欧美h | 羞羞视频日本动漫免费网站 | 日日夜夜91 | 麻豆网站免费看 | 成人xxxx| 精品久久久久久无码人妻蜜桃 | 国产人妖专区在线播放 |