Post-translational modification of pregnane x receptor.

Post-translational modification of pregnane x receptor.
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DOI:
10.1016/j.phrs.2011.02.011
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发表时间:
2011-07
影响因子:
9.3
通讯作者:
Mani, Sridhar
Mani, Sridhar
中科院分区:
医学1区
文献类型:
--
作者:
Staudinger, Jeff L.;Xu, Chenshu;Biswas, Arunima;Mani, Sridhar

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孕烷X受体(PXR,NR 1 I2)最初被描述为一种广谱的肠-肝异生物质“传感器”和药物诱导基因表达的主调节器。在过去的十年中,配体介导的基因激活的一个令人信服的描述已经公布,坚定地确立了这种受体在哺乳动物的代谢和运输外源性物质的核心作用。有趣的是,用有效的PXR配体进行药物治疗产生了几种严重的副作用,包括降低了肿瘤发生、脂质代谢和炎症的能力;这可能是由于PXR介导的对这些关键生理功能的基因表达程序的抑制。一个综合的模型正在出现,揭示了一个复杂的相互作用之间的配体结合和泛素化,磷酸化,SUMO化,乙酰化状态的这一重要的核受体蛋白。这些发现指出了PXR的翻译后修饰在选择性抑制基因表达中的关键作用,并为研究PXR生物活性的全新调节模式打开了大门。
Pregnane x receptor (PXR, NR1I2) was originally characterized as a broad spectrum entero-hepatic xenobiotic ‘sensor’ and master-regulator of drug inducible gene expression. A compelling description of ligand-mediated gene activation has been unveiled in the last decade that firmly establishes this receptor’s central role in the metabolism and transport of xenobiotics in mammals. Interestingly, pharmacotherapy with potent PXR ligands produces several profound side effects including decreased capacities for gluconeogenesis, lipid metabolism, and inflammation; likely due to PXR-mediated repression of gene expression programs underlying these pivotal physiological functions. An integrated model is emerging that reveals a sophisticated interplay between ligand binding and the ubiquitylation, phosphorylation, SUMOylation, and acetylation status of this important nuclear receptor protein. These discoveries point to a key role for the post-translational modification of PXR in the selective suppression of gene expression, and open the door to the study of completely new modes of regulation of the biological activity of PXR.
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