Health & Science

This Goat Did Not Come From an Artificial Womb

Turns out we need uteruses even more than we thought.

Not too long ago, baby-in-a-box technology seemed imminent. In the late 1990s, scientists in Japan startled the world with a freestanding artificial womb: an acrylic, fluid-filled incubator. The scientists used it to gestate goats that had been removed prematurely from their mothers' uteruses. Again in the early 2000s, a group of IVF researchers in Manhattan made headlines with custom wombs: They grew endometrial tissue, molded it into a curved shape, and tried to bring human and mouse embryos to term. Neither project made it to fruition. But there was every reason to feel excited by the promises of high-tech womb substitutes, in which human babies might someday come to term. Since then, though, the scientific quest for artificial uteruses has sputtered. Why has it gone thoroughly out of fashion?

In the last five years, scientists have come to believe that the environment of the mother's womb is more, not less, complex and crucial. Across several different fields, research has taken off on the intertwining of mother and embryo, or fertilized egg, that occurs from the very beginning. Psychologists are finding that maternal cues may influence the personality of the developing fetus. Cellular cross-talk between mother and fetus seems to shape normal development and susceptibility to disease. And some IVF scientists have tried to reduce chromosomal abnormalities by incubating fertilized eggs within the mother's body, minimizing the time in a Petri dish. All of this adds up to a sea change in how scientists view the uterus, and makes the idea of bypassing the maternal womb seem nearly impossible. At the beginning of our lives, we apparently need mothers even more than we ever thought.

It's worth revisiting how close scientists thought they were to a brave new no-uterus world to see how clearly scientific attitudes have shifted. The group led by Yosinori Kuwabara in late-'90s Japan managed to keep goat fetuses alive for up to three weeks in a fluid-filled incubator, with an artificial placenta that supplied oxygen and nutrients and removed wastes. Remarkably, several fetuses made it to term (21 weeks for a goat). But they had lung disorders and other abnormalities. Also, they weren't popped into the incubator until a late gestational age. As one expert on preemies told me, if you translate goat time to human time, the fetuses "were practically teenagers" by the time they reached the artificial womb.

The IVF researchers also, fleetingly, boasted seeming success. Concentrating on the beginning of gestation rather than the end, they created tissue-engineered wombs in which fertilized eggs might develop. Led by researcher Hung-Ching Liu at the Center for Reproductive Medicine and Infertility in Manhattan, the group managed to grow human embryos for up to 10 days. Starting in 2002, Liu's team also created artificial mouse uteruses in which they incubated numerous mice. At least one survived almost to term. But ultimately, it died along with the others, some of which had striking physical abnormalities. Blood vessels linking the fetus to the artificial womb had failed to develop normally, Liu said at the time. Since then, she has stopped speaking publicly on the topic. A spokesperson would only confirm that the research "has not been ongoing for several years." (Never mind that in 2005, Liu confidently told a reporter that she expected to have a viable mouse womb in five to 10 years and a human one in "10 years, maybe, or a little more.")

Tags: artificial womb, embryo, gray nurse shark, in vitro fertilization, shulamith firestone

Amanda Schaffer is a science and medical columnist for Double X and Slate. Read more of her work here.

Comments

haha

By: c181455031 | Wed, 02/08/2012 - 22:01

kobe vi
kobe vi shoes
cheap kobe vi
Kobe Size 13
Nike Hyperdunk
Air Griffey Max I
Air Griffey Max II
Nike Zoom Huarache
Nike Zoom Hyperfuse
Adidas Adizero rose

Air Max 2012
Air Max 2011
Air Max 87
Air Max 1
Air Max 90
Air Max 91
Air Max 2009
Air Max 2010
Air Max TN
Air Max 24-7

Hi! Thanks for the great

By: alpha15995 | Thu, 01/19/2012 - 00:58

Hi! Thanks for the great information you have provided! You have touched on crucuial points! i bookmarked it and will be back to check it out some more later.
wedding dresses online store,cheap wedding dresses,UGG Boots On Sale,cheap ugg boots,Down coats and jackets,Down coats,Down jackets,Classic And Fashion Boots,Fashion boots,Classic Boots,

fake oakley sunglasses

By: cxf0401 | Tue, 01/10/2012 - 22:19

Looking attractive and smart in the fingers of the other people has been the aspiration for any ladies. In order to get noticed instantly, pandora jewelry have the new philosophy of out standing fashion quality.So what is the best choice for you to show yourself .The answer is pandora bracelets.The Pandora range of rings is a wealth of beautiful gemstones and precious metals combined with fabulous design. pandora jewelry sale store offer pandora bracelets and pandora charms,welcome to pandora bracelets sale outlet.up to 70% discount.For over 40 years cheap north face produces some of the finest men's, women's and kids jackets and apparel for every outdoor activity, from trail running to backcountry skiing. the north face outlet tents and equipment are used by the world's top mountaineers north face outlet backpacks have the style for everyday use around town.If you are new to northfaceoutlet, a good place to start is the Denali fleece jacket, for men, women and kids.cheap northface for you.

The Hackney North and Nike

By: seoerchen | Fri, 01/06/2012 - 04:33

The Hackney North and Nike Air Max 90 Stoke Newington MP was addressing a freelance journalist on Twitter yesterday when she wrote: "White people love playing 'divide & Nike Air Max 2012 rule'. We Air Max 90 Trainers should not play their Air Max 95 game tacticasoldascolonialism."A Labour Party spokesman said: "We disagree with Diane's tweet. It is wrong to make sweeping generalisations about any race, creed, or culture. The Labour Party has always campaigned Air Max 1 against such behaviour - and so has Diane Abbott."Mr Miliband told Ms Abbott that the remark was unacceptable, Nike Air Max 90 Premium shadow business secretary Chuka Umunna said."The contents of the tweet were clearly unacceptable Air Max 90 and Diane has, of Nike Air Max 90 Hyperfuse course, therefore unreservedly apologised for that," he told BBC News."I should say that Nike Air Max 90 VT the leader of the Nike Air Max 95 Labour Party, Ed Miliband, has spoken to her this morning and made it very clear, in no uncertain terms, that the contents of the tweet were unacceptable and Diane agrees with that.

On a cold Saturday in early

By: seoerchen | Fri, 01/06/2012 - 02:58

On a cold Saturday in early 2009, Glenn Black, a yoga teacher of nearly four decades, whose devoted clientele includes a number of celebrities and prominent gurus, was giving a master class at Sankalpah Yoga in Manhattan. Black is, in many ways, a classic yogi: he studied in Pune, India, at the institute founded by the legendary B. K. S. Iyengar, and spent years in solitude and meditation. He now lives in Rhinebeck, N.Y., and often teaches at the Cheap Nike Air Max 2012 nearby Omega Institute, a New Age emporium spread over nearly 200 acres of Nike Air Max 2012 Shoes woods and gardens. He is known for his rigor and his down-to-earth style. But this was not why I sought him out: Black, I’d been told, was the person Nike Air Max 90 Premium to speak with if you wanted to know not about the virtues of Nike Air Max 95 yoga but rather about the damage it could do. Many Nike Air Max 90 of his regular clients came to him for bodywork or rehabilitation following yoga injuries. This was the situation I found myself in. In my 30s, I had somehow managed to rupture a disk in my lower back Air Max 2012 and found I could prevent bouts of pain with a selection of yoga postures and abdominal exercises. Then, in 2007, while doing the extended-side-angle pose, a posture hailed as a cure for many diseases, my back gave way. With Nike Air Max 2012 it went my belief, na?ve in retrospect, that yoga was Nike Air Max 87 a source only of healing and never harm.

The former U.S. Army private

By: seoerchen | Wed, 01/04/2012 - 03:09

The former U.S. Army private was Nike Air Max also suspected in a separate shooting incident on early New Year's Day that injured three men and a woman at a Air Max 95 Cheap house party in the Skyway neighborhood of Renton, Washington near Seattle, according to the King County Sheriff's Department.Barnes received a Chapter 14 misconduct discharge in November of 2009 after being charged Air Max Shoes by civilian authorities with driving under the influence and improperly transporting a privately owned weapon, Army Air Max 95 Boots officials Nike Air Max LTD said.The park, which is about 80 miles southeast of Seattle, was expected to Air Max remain closed Cheap Air Max 90 to visitors until Wednesday, Snook said.During the night, an airplane Nike Air Max TN equipped Nike Air Max 24-7 with heat-seeking equipment had tracked the assailant through the snow. However, several law enforcement sources said that a body with "no heat signature" was Air Max Store found not far from Paradise about 10:20 a.m. Monday.Det. Ed Troyer, a spokesman for the Pierce County Sheriff's Office, had said earlier there was a "strong possibility" the remains belong to Barnes.

Found Authentic louis vuitton

By: looking | Tue, 01/03/2012 - 04:29

Found Authentic louis vuitton wallet on MALLERIES - Authentic Louis Vuitton Cherry Cerises Zippered Wallet.louis vuitton outlet discount on sale, outlet louis vuitton purses, shoes, sunglasses are 75% off online! Enjoy our louis vuitton outlet new arrivals free shipping.Choose ideal Louis Vuitton accessory to match your look and figure and also the occasion. Authentic louis vuitton wallets 2011 On Sale At Our Online Store.

with exaggerated Karen Millen

By: karenmillens | Thu, 12/29/2011 - 22:48

with exaggerated Karen Millen Online . Since I’m tired of shopping, I’m going to write about something that I know very little about it and try to relate it to something I’m far too familiar with. Jesus, through Mary, his natural born mother and Joseph, his adoptive father, was of royal blood and would have been king if Israel hadn’t been under Roman rule (see Matthew 1:17) According to Jewish custom, the swaddling clothes, the strips of cloth Mary used to wrap her Karen Millen dresses sale, bore the symbols of her royal heritage. When the shepherds came to worship the baby Jesus

The karen millen beaded dress

By: karenmillens | Thu, 12/29/2011 - 22:41

The karen millen beaded dress era was no exception- people even in the worst conditions clung to any karen millen 2011 collection of respectability they could through their clothing. While a strange sight, it certainly was not an unusual karen millen collection 2011 to see a man in a workhouse laboring in a rock pile next to convicts in his tailcoat and top hat. They wore these clothes literally until they fell karen millen skirts sale The second-hand clothing trade thrived in London, where old and worn clothes were purchased

that may assist you to

By: karenmillens | Thu, 12/29/2011 - 22:41

that may assist you to estimate what quantity a lot of cheap Karen Millen wish to save lots of if something, before you’ll be able to afford to retire and live your Karen Millen outlet store of moving abroad. One intends the rascalresscationic from Quenqua&rsquos section theadgear derma-karen millen outlet workforce are a workher annoyed karen millen uk store . The angle of adrumpusg likewise mworkforces absolutecoverssome