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Identification of receptors forneuromedin U and its role in feeding

机译:鉴定forneuromedin U受体及其在喂养中的作用

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Neuromedin U (NMU) is a neuropeptide with potent activity on smooth muscle which was isolated first from porcine spinal cord and later from other species. It is widely distributed in the gut and central nervous system. Peripheral activities of NMU include stimulation of smooth muscle, increase of blood pressure, alteration of ion transport in the gut, control of local blood flow and regulation of adrenocortical function. An NMU receptor has not been molecularly identified. Here we show that the previously described orphan G-protein-coupled receptor FM-3 (ref. 15) and a newly discovered one (FM-4) are cognate receptors for NMU. FM-3, designated NMU1R, is abundantly expressed in peripheral tissues whereas FM-4, designated NMU2R, is expressed in specific regions of the brain. NMU is expressed in the ventromedial hypothalamus in the rat brain, and its level is significantly reduced following fasting. Intracerebro-ventricular administration of NMU markedly suppresses food intake in rats. These findings provide a molecular basis for the biochemical activities of NMU and may indicate that NMU is involved in the central control of feeding.
机译:Neuromedin U(NMU)是一种对平滑肌具有有效活性的神经肽,其首先从猪脊髓分离,然后从其他物种分离。它广泛分布于肠道和中枢神经系统。 NMU的外围活动包括刺激平滑肌,增加血压,改变肠道中的离子运输,控制局部血流和调节肾上腺皮质功能。 NMU受体尚未分子鉴定。在这里,我们显示先前描述的孤儿G蛋白偶联受体FM-3(参考文献15)和一个新发现的受体(FM-4)是NMU的同源受体。 FM-3(称为NMU1R)在周围组织中大量表达,而FM-4(称为NMU2R)在脑的特定区域表达。 NMU在大鼠脑下丘脑下丘脑中表达,禁食后其水平显着降低。脑室内给予NMU可明显抑制大鼠的食物摄入。这些发现为NMU的生化活性提供了分子基础,并可能表明NMU参与了进食的中央控制。

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