首页> 外文期刊>Life sciences >Corticotropin-releasing hormone acts on CRH-R1 to inhibit the spontaneous contractility of non-labouring human myometrium at term.
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Corticotropin-releasing hormone acts on CRH-R1 to inhibit the spontaneous contractility of non-labouring human myometrium at term.

机译:促肾上腺皮质激素释放激素作用于CRH-R1以抑制足月无劳动能力的人子宫肌层的自发收缩。

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AIMS: Corticotropin-releasing hormone (CRH) has been implicated in the mechanisms controlling human parturition. The aims of the present study were to explore effects of CRH on contractility of human term myometrium and compare these effects in labouring and non-labouring myometrial strips. MAIN METHODS: The cumulative effects of CRH (10(-10) to 10(-7) mol/l) on the spontaneous contractility of labouring and non-labouring myometrial samples were evaluated using isometric tension recordings. KEY FINDINGS: CRH exhibited a concentration-dependent relaxant effect on spontaneous contractions in non-labouring term myometrium. This effect was mediated principally via a reduction in the amplitude rather than any changes in the frequency of contractions. The CRH-induced inhibitory effect on contractility could be blocked by pre-treatment with a CRH-R1 antagonist antalarmin, but not by pre-treatment with the CRH-R2 antagonist astressin 2B. CRH had no effect on spontaneous contractions in the labouring myometrium, as no change in either the amplitude or the frequency was observed. SIGNIFICANCE: Our findings indicate that CRH acts on CRH-R1 to inhibit spontaneous contractions in term myometrium from women who were not undergoing labour, but not those who were undergoing labour, supporting the hypothesis that CRH exerts dual effect on myometrium during pregnancy.
机译:目的:促肾上腺皮质激素释放激素(CRH)与控制人类分娩的机制有关。本研究的目的是探讨CRH对人足子宫肌层收缩性的影响,并比较在劳动和非劳动子宫肌层条带中的这些影响。主要方法:使用等轴测张力记录评估了CRH(10(-10)至10(-7)mol / l)对人工和非人工子宫肌层样品自发收缩能力的累积影响。主要发现:CRH对非劳动期子宫肌层的自发性收缩表现出浓度依赖性的松弛作用。这种作用主要是通过降低幅度而不是通过收缩频率的任何改变来介导的。 CRH-R1拮抗剂antalarmin预处理可阻止CRH诱导的对收缩力的抑制作用,但CRH-R2拮抗剂astressin 2B则不能阻止CRH诱导的收缩力抑制。 CRH对分娩子宫肌层的自发收缩没有影响,因为未观察到振幅或频率的变化。意义:我们的研究结果表明,CRH对CRH-R1起作用,抑制了未进行分娩但未进行分娩的妇女足月子宫肌层的自发收缩,支持了CRH在怀孕期间对子宫肌层产生双重作用的假说。

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