PNAS:首次发现神秘力量支撑长时间分娩宫缩!

2015-08-14 佚名 生物探索

众所周知,催产素能够在分娩时刺激子宫收缩,能够帮助婴儿顺利通过产道。由于紧缩的肌肉会挤压到血管导致血液流动受阻、氧气含量降低,按照正常生理规律,宫缩过程应会减弱。然而分娩过程中子宫肌肉却能维持长时间收缩,除了激素等外力作用,是否还存在其他动力呢?为解开这一谜题,利物浦转化医学研究所Susan Wray教授带领博士后研究人员Sarah Arrowsmith、博士Mohammed Alotaibi对子

众所周知,催产素能够在分娩时刺激子宫收缩,能够帮助婴儿顺利通过产道。由于紧缩的肌肉会挤压到血管导致血液流动受阻、氧气含量降低,按照正常生理规律,宫缩过程应会减弱。然而分娩过程中子宫肌肉却能维持长时间收缩,除了激素等外力作用,是否还存在其他动力呢?

为解开这一谜题,利物浦转化医学研究所Susan Wray教授带领博士后研究人员Sarah
Arrowsmith、博士Mohammed Alotaibi对子宫收缩机制进行研究。相关研究成果发表于the journal Proceedings of the National Academy of Sciences。

研究团队进行了系统试验发现,即便中断催产素的注射,肌肉收缩过程还是会逐渐增强。这就意味着,催产素虽然起到作用,但绝不是分娩过程中促进子宫肌肉收缩的唯一贡献者。

建立在这个结果上,研究人员继续挖掘持续宫缩的“力量来源”。他们注意到心脏研究中会对其肌肉细胞进行缺氧预处理,以避免细胞受到极度缺氧的伤害。这种预处理能在紧急状况下拯救生命。

顺着这一线索,研究人员发现一种保护子宫肌肉的机制——低氧诱导力增强(HIFI),这种机制能够在子宫面临反复性缺乏血液和氧气供应的情况下,促进子宫收缩进行自我保护。这是一个正反馈调节过程:肌肉重复性收缩,氧气下降,收缩频率增强。

试验过程中,一旦HIFI机制启动,能够维持数小时,时间与实际分娩一样。这种机制是支撑长时间分娩的关键,增加紧急剖腹产的婴儿存活几率。Wray教授表示,这是一个惊奇的发现,不仅扩充了科学家们对生物系统响应低氧状态的认知,还为医生应对难产等分娩困难提供了新的解决思路。

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    2015-12-20 drwjr
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    2015-09-02 windight
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    2015-10-05 1ddcfa8bm07(暂无匿称)

    神秘力量~~~

    0

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    2015-08-16 cmn

    神秘力量

    0

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    2015-08-16 stupidox

    好!

    0

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    2015-08-16 linlin2312
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    2015-08-14 medcardio

    这个研究的思路非常不错

    0

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    2015-08-14 ndd99

    是真的吗?

    0

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    2015-08-14 lovejing

    厉害了

    0