Nat Commun:子宫外维持早产动物发育时间获得新突破,人造子宫还有多远?

2017-04-26 佚名 Nature自然科研

《自然-通讯》本周在线发表的研究报告了一个可在外部人造子宫中维持超早产羔羊生存的系统。试验中的羔羊存活了四周,是迄今为止子宫外装置维持动物稳定机能的最长时间。

《自然-通讯》本周在线发表的研究 An extra-uterine system to physiologically support the extreme premature lamb 报告了一个可在外部人造子宫中维持超早产羔羊生存的系统。试验中的羔羊存活了四周,是迄今为止子宫外装置维持动物稳定机能的最长时间。

通过良好的新生儿重症监护,23周龄及以上的人类早产儿的存活率已经得到了提高,但超早产仍然是新生儿死亡和致病的一个重要原因。然而,设计能在超早产新生儿中延长妊娠的体外系统的尝试目前仍未成功。

Alan Flake及同事开发了一种封闭的流体人造环境,这一系统由一个聚乙烯薄膜袋及通过脐带接口连接的氧气回路组成,能模拟子宫内的环境。作者用超早产羔羊(在生物学上与妊娠23-24周的早产儿相当)测试了系统。



封闭流体人造环境Partridge et al.

他们表明,在四周的研究期内,羔羊胚胎在这一子宫外系统中的血液气体与血液循环稳定,且发育正常(包括肺成熟和脑部生长)。作者没有提供羔羊在这一阶段后的发育数据。因此,这项研究缺乏有关更长时间的早产保育有何影响的数据。



羔羊胚胎发育正常Partridge et al.

此前的技术只能让动物的胎生存几天,与之相比,这项研究延长了胎的生存期。更重要的是,实验动物维持了正常的胎生理,这一点此前从未在子宫外实现过。

在人体中应用这一系统前,研究者还需要解决一系列问题:举例来说,人类早产儿比羔羊要小得多,因此需要开发出专门适用于人类的装置;通过脐带连接此类装置与和人类胎儿或许无法实现;需要开发适用于人类胎儿的“羊膜”液等等。目前,人们尚不清楚这种保育方法的长期健康影响。

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    2017-07-14 zxxiang
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    2017-07-27 liye789132251
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    2017-08-02 liuli5079
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    2017-08-03 hb2008ye
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    2017-04-28 neurowu

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