Bidirectional crosstalk between Hypoxia-Inducible Factor and glucocorticoid signalling in zebrafish larvae

Bidirectional crosstalk between Hypoxia-Inducible Factor and glucocorticoid signalling in zebrafish larvae
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斑马鱼幼虫缺氧诱导因子和糖皮质激素信号之间的双向串扰

DOI:
10.1101/748566
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发表时间:
2019
期刊:
--
影响因子:
--
通讯作者:
Marchi D
Marchi D
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--
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--
作者:
Marchi D

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在过去的几十年中,体外研究强调了低氧诱导因子(HIF)和糖皮质激素(GC)信号通路之间存在串扰的可能性。然而,这种相互作用究竟是如何在活体中发生的仍存在争议。在这里,我们使用斑马鱼幼虫(Danio Rerio)来阐明体内低氧信号如何以及在多大程度上影响内源性糖皮质激素途径,反之亦然。首先,我们的结果表明,在HIF信号上调的情况下,受精后5天幼虫的糖皮质激素受体(Gr)反应和内源性皮质醇水平都受到抑制。此外,尽管HIF活性在常氧下很低,但我们的数据显示,它已经阻碍了糖皮质激素的活性和水平。其次,我们进一步分析了糖皮质激素对HIF活性的活体贡献。有趣的是,我们的结果显示糖皮质激素受体(GR)和盐皮质激素受体(MR)都在增强它的过程中起着关键作用。最后,我们发现糖皮质激素通过多种途径促进HIF信号传导。总体而言,我们的发现使我们能够提出一个模型,说明这种串扰是如何在体内发生的。
In the last decadesin vitrostudies highlighted the potential for crosstalk between Hypoxia-Inducible Factor-(HIF) and glucocorticoid-(GC) signalling pathways. However, how this interplay precisely occursin vivois still debated. Here, we use zebrafish larvae (Danio rerio) to elucidate how and to what degree hypoxic signalling affects the endogenous glucocorticoid pathway and vice versa,in vivo. Firstly, our results demonstrate that in the presence of upregulated HIF signalling, both glucocorticoid receptor (Gr) responsiveness and endogenous cortisol levels are repressed in 5 days post fertilisation larvae. In addition, despite HIF activity being low at normoxia, our data show that it already impedes both glucocorticoid activity and levels. Secondly, we further analysed thein vivocontribution of glucocorticoids to HIF activity. Interestingly, our results show that both glucocorticoid receptor (GR) and mineralocorticoid receptor (MR) play a key role in enhancing it. Finally, we found indications that glucocorticoids promote HIF signalling via multiple routes. Cumulatively, our findings allowed us to suggest a model for how this crosstalk occursin vivo.
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