MRAP2 regulates ghrelin receptor signaling and hunger sensing.

MRAP2 regulates ghrelin receptor signaling and hunger sensing.
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DOI:
10.1038/s41467-017-00747-6
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发表时间:
2017-09-28
影响因子:
16.6
通讯作者:
Sebag JA
Sebag JA
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Srisai D;Yin TC;Lee AA;Rouault AAJ;Pearson NA;Grobe JL;Sebag JA

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生长素释放肽是唯一已知的循环促食欲激素。它主要由胃分泌,作用于下丘脑中的受体,即生长激素促分泌素受体 1a (GHSR1a),发出饥饿信号并促进食物摄入。黑皮质素受体辅助蛋白 2 (MRAP2) 先前已被证明可通过调节黑皮质素 4 受体和前动力素受体的活性来调节能量稳态。在这项研究中,我们将 MRAP2 确定为 ghrelin-GHSR1a 信号传导的伙伴。我们发现 MRAP2 与 GHSR1a 相互作用,并在体外和体内增强 ghrelin 刺激的信号传导。我们证明,在缺乏 MRAP2 的情况下,禁食无法激活刺鼠相关蛋白神经元。此外,我们还发现,在缺乏 MRAP2 的小鼠中,生长素释放肽的促食欲作用消失。我们的结果表明,MRAP2 是能量稳态机制的重要调节剂,通过调节整个下丘脑的多个 GPCR 来发挥作用。黑皮质素受体辅助蛋白 2 (MRAP2) 是一种接头蛋白,有助于黑皮质素 4 受体和前动力蛋白受体 1 信号传导。作者在此表明,MRAP2 还调节下丘脑中的生长素释放肽受体信号传导和小鼠的饥饿感知。
Ghrelin is the only known circulating orexigenic hormone. It is primarily secreted by the stomach and acts at its receptor, the growth hormone secretagogue receptor 1a (GHSR1a), in the hypothalamus to signal hunger and promote food intake. The melanocortin receptor accessory protein 2 (MRAP2) was previously shown to regulate energy homeostasis through the modulation of the activity of the melanocortin-4 receptor and prokineticin receptors. In this study we identify MRAP2 as a partner of ghrelin-GHSR1a signaling. We show that MRAP2 interacts with GHSR1a and potentiates ghrelin-stimulated signaling both in vitro and in vivo. We demonstrate that in the absence of MRAP2, fasting fails to activate agouti-related protein neurons. In addition, we show that the orexigenic effect of ghrelin is lost in mice lacking MRAP2. Our results suggest that MRAP2 is an important modulator of the energy homeostasis machinery that operates through the regulation of multiple GPCRs throughout the hypothalamus. Melanocortin receptor accessory protein 2 (MRAP2) is an adaptor protein that contributes to melanocortin-4 receptor and prokineticin receptor 1 signalling. Here the authors show that MRAP2 also regulates ghrelin receptor signalling in the hypothalamus and starvation sensing in mice.
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