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Potent and Selective Small-Molecule Inhibitors ofcIAP1/2 Proteins Reveal That the Binding of Smac Mimetics to XIAPBIR3 Is Not Required for Their Effective Induction of Cell Death inTumor Cells

机译:强效和选择性的小分子抑制剂cIAP1 / 2蛋白揭示了Smac模拟物与XIAP的结合BIR3不需要有效诱导细胞死亡肿瘤细胞

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摘要

Cellular inhibitor of apoptosis protein 1 and 2 (cIAP1/2) and X-linked inhibitor of apoptosis protein (XIAP) are key apoptosis regulators and promising new cancer therapeutic targets. This study describes a set of non-peptide, small-molecule Smac (second mitochondria-derived activator of caspases) mimetics that are selective inhibitors of cIAP1/2 over XIAP. The most potent and most selective compounds bind to cIAP1/2 with affinities in the low nanomolar range and show >1,000-fold selectivity for cIAP1 over XIAP. These selective cIAP inhibitors effectively induce degradation of the cIAP1 protein in cancer cells at low nanomolar concentrations and do not antagonize XIAP in a cell-free functional assay. They potently inhibit cell growth and effectively induce apoptosis at low nanomolar concentrations in cancer cells with a mechanism of action similar to that of other known Smac mimetics. Our study shows that binding of Smac mimetics to XIAP BIR3 is not required for effective induction of apoptosis in tumor cells by Smac mimetics. These potentand highly selective cIAP1/2 inhibitors are powerful tools in theinvestigation of the role of these IAP proteins in the regulationof apoptosis and other cellular processes.
机译:细胞凋亡蛋白1和2的抑制剂(cIAP1 / 2)和X连锁凋亡蛋白的抑制剂(XIAP)是关键的细胞凋亡调节剂,并有望成为新的癌症治疗靶点。这项研究描述了一组非肽,小分子Smac(第二个线粒体衍生的半胱氨酸蛋白酶的激活剂)模拟物,它们是cIAP1 / 2相对于XIAP的选择性抑制剂。最有效和最具选择性的化合物以低纳摩尔范围的亲和力与cIAP1 / 2结合,显示出对XIAP的cIAP1选择性> 1,000倍。这些选择性的cIAP抑制剂可在低纳摩尔浓度下有效诱导癌细胞中cIAP1蛋白的降解,并且在无细胞功能测定中不会拮抗XIAP。它们以低纳摩尔浓度有效抑制癌细胞的生长并有效诱导癌细胞凋亡,其作用机理与其他已知的Smac模拟物相似。我们的研究表明,Smac模拟物与XIAP BIR3的结合并不是Smac模拟物有效诱导肿瘤细胞凋亡所必需的。这些有力和高度选择性的cIAP1 / 2抑制剂是这些IAP蛋白在调节中的作用的研究细胞凋亡和其他细胞过程

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