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    • 26. 发明申请
    • Regulation of HIF protein levels via deubiquitination pathway
    • 通过去泛素化途径调节HIF蛋白水平
    • US20050049309A1
    • 2005-03-03
    • US10890756
    • 2004-07-14
    • Lynn KirkpatrickGarth PowisSarah Welsh
    • Lynn KirkpatrickGarth PowisSarah Welsh
    • A61K31/195A61K31/66C12N20060101
    • A61K31/66
    • The hypoxia inducible factor-1 (HIF-1) transcription factor is an important regulator of the cellular response to hypoxia. The activity of HIF-1 is regulated by the level of the HIF-1α subunit, HIF-1α, which is rapidly degraded under normoxic conditions by the ubiquitin-proteasome pathway. HIF-1α levels increase under hypoxic conditions. Many human cancers also show constitutively increased HIF-1α levels. PX-478 or S-2-amino-3-[4′-N,N,-bis(2-chloroethyl)amino]phenyl propionic acid N-oxide dihydrochloride, is a novel anticancer agent, and is capably of decreasing both constitutive and hypoxia induced HIF-1α protein levels and HIF-1 transactivation in vitro and in vivo. In method embodiments, the administration of PX-478 is independent of the pathways of HIF-1α regulation involving the von Hippel-Lindau protein and p53. PX-478 causes an increase in polyubiquitinated HIF-1α levels due to inhibition of HIF-1α deubiquitination. The levels of other proteins whose proteasomal breakdown is mediated by ubiquitination are not affected by PX-478. Deubiquitination is a novel pathway for the regulation of cellular HIF-1α levels and PX-478 is a specific inhibitor of the pathway. Therapeutic compounds for regulating cellular HIF-1α levels and methods of regulating cellular HIF-1α levels are herein provided.
    • 缺氧诱导因子-1(HIF-1)转录因子是细胞对缺氧反应的重要调控因子。 HIF-1的活性受HIF-1α亚基HIF-1α的水平调节,HIF-1α在泛素 - 蛋白酶体途径的正常氧条件下迅速降解。 低氧条件下HIF-1α水平升高。 许多人类癌症也显示出组成型增加的HIF-1α水平。 PX-478或S-2-氨基-3- [4'-N,N,双(2-氯乙基)氨基]苯基丙酸N-氧化物二盐酸盐是一种新型抗癌剂, 缺氧诱导HIF-1α蛋白水平和体外和体内HIF-1反式激活。 在方法实施方案中,PX-478的施用与涉及von Hippel-Lindau蛋白和p53的HIF-1α调节途径无关。 PX-478由于抑制HIF-1α去泛素化而导致多泛素化的HIF-1α水平升高。 蛋白酶体破坏由泛素介导的其他蛋白质的水平不受PX-478的影响。 去泛素化是调节细胞HIF-1α水平的新途径,PX-478是该途径的特异性抑制剂。 本文提供了用于调节细胞HIF-1α水平的治疗化合物和调节细胞HIF-1α水平的方法。