日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

   

WORLD / America

Doctors grow organ from patients' own cells
(China Daily)
Updated: 2006-04-05 06:29

WASHINGTON: For the first time, scientists have grown a human organ from patients' own cells to transplant back into their bodies.

The breakthrough was pioneered by US doctors who developed bladders in the laboratory and are now using their techniques to work on doing the same for 20 kinds of tissues and organs, including blood vessels and hearts.

With tissues grown from their own cells, patients don't face the risk of rejection as they do with ordinary transplants and wouldn't have to live with the fear that a donor might not be found.

"This is one small step in our ability to go forward in replacing damaged tissues and organs," Anthony Atala, who led the research, said on Monday in announcing the development.

Atala developed the procedure for patients born with spina bifida, a birth defect in which their spines were not enclosed and that impaired their bladder functions.

The traditional treatment is to replace the bladder with one formed from part of the intestine, but because the intestine absorbs nutrients and the bladder excretes, the procedure can lead to its own host of problems, including kidney stones, osteoporosis and a higher cancer risk.

So Atala began work in 1990 on an alternative that led to the transplants in seven patients from 4 to 19 years old that he reported in the Lancet medical journal.

Atala, who began his work at Boston Children's Hospital before moving to the Wake Forest University School of Medicine in North Carolina, reported that he and his team of researchers removed a small portion of the patients' bladders, extracted cells from the biopsies and began using those cells to grow more like them in Petri dishes. The cells were then placed on a mould shaped like a bladder to grow further.

In seven to eight weeks after the biopsy, the engineered bladders were then sewn onto the patients' original bladders, and a few weeks after the surgery, the engineered organs had grown into normal-sized bladders and had begun functioning, the researchers said.

The first transplant was done in 1999, and the team said the engineered bladders have functioned as well as bladders reconstructed with intestinal tissue but without the side effects.

The procedure relieved pressure within the bladder, which can cause kidney damage, and improved the patients' incontinence, they said.

Researchers reported that the rebuilt bladders were up to three times more elastic and better at holding urine.

"We have shown that regenerative-medicine techniques can be used to generate functional bladders that are durable," Atala said. "This suggests that regenerative medicine may one day be a solution to the shortage of donor organs."

Atala said that further study is needed before the techniques could be put into wide use, but additional clinical trials were scheduled for this year.

(China Daily 04/05/2006 page1)

 
 

主站蜘蛛池模板: 欧美成人做爰大片免费看黄石 | 久久久神马 | 色肉色伦交av色肉色伦 | 欧美体内she精高潮 偷拍在线视频 | 欧美黄色大全 | 国产二区av | 亚洲成av人影院 | 欧美人与交 | 福利在线播放 | 欧美大片在线观看 | 亚洲成年人| 欧美日韩成人精品 | 欧美一级日韩 | 999久久| 欧美中文字幕在线视频 | 日韩美女在线视频 | 国产96视频| 四虎久久久 | 欧美一级特黄视频 | 色综合久久久久久 | 爱爱久久 | 欧美黄色激情视频 | 欧美日韩在线看 | 开心激情网站 | 免费观看毛片网站 | 欧美美女一区二区 | 懂色av懂色av粉嫩av分享吧 | 日本欧美亚洲 | 99tv| 日本一级理论片在线大全 | 亚洲911精品成人18网站 | 黄视频在线播放 | 国产毛片av| 97狠狠 | 中文字幕一级片 | a久久久久久 | 亚洲成网站 | 日韩视频h | 国产精品久久久久久久久久久久久久久久 | 亚洲一二区视频 | 成人免费一区二区 |