Revealing a steroid receptor ligand as a unique PPARγ agonist.

Revealing a steroid receptor ligand as a unique PPARγ agonist.
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DOI:
10.1038/cr.2011.162
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发表时间:
2012-04
期刊:
影响因子:
44.1
通讯作者:
--
中科院分区:
生物学1区
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--
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过氧化物酶体增殖物激活受体γ(PPARγ)调节代谢稳态,是抗糖尿病药物的分子靶点。我们在这里报告的类固醇受体配体,RU-486,作为一个意想不到的PPARγ激动剂的鉴定,从而揭示了这种类固醇药物的新的信号通路。与罗格列酮相似,RU-486调节关键PPARγ靶基因的表达并促进脂肪细胞分化,但脂肪形成活性较低。受体-配体相互作用的结构和功能研究揭示了RU-486在具有独特性质和表位的PPARγ配体结合口袋中的独特结合模式的分子基础,为RU-486与噻唑烷二酮类(TZDs)药物的区分提供了分子机制。我们的研究结果共同表明,类固醇化合物可能代表了一种替代方法,用于设计非噻唑烷二酮PPARγ配体治疗胰岛素抵抗。
Peroxisome proliferator activated receptor gamma (PPARγ) regulates metabolic homeostasis and is a molecular target for antidiabetic drugs. We report here the identification of a steroid receptor ligand, RU-486, as an unexpected PPARγ agonist, thereby uncovering a novel signaling route for this steroid drug. Similar to rosiglitazone, RU-486 modulates the expression key PPARγ target genes and promotes adipocyte differentiation but with lower adipogenic activity. Structural and functional studies of receptor-ligand interactions reveal the molecular basis for a unique binding mode for RU-486 in the PPARγ ligand binding pocket with distinctive properties and epitopes, providing the molecular mechanisms for the discrimination of RU-486 from thiazolidinediones (TZDs) drugs. Our findings together indicate that steroid compounds may represent an alternative approach for designing non-thiazolidinedione PPARγ ligands in the treatment of insulin resistance.
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