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小分子破坏E3接头蛋白SPOP-底物相互作用与肾癌治疗
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摘要
泛素化信号调控的紊乱与多种癌症的发生相关。尚没有靶向E3连接酶泛素化信号通路的药物成功上市。过表达E3连接酶接头蛋白SPOP的肾透明细胞癌对化疗耐受,并且对于靶向治疗不敏感。过度活化的缺氧诱导因子HIF转录调控SPOP表达,并且使核蛋白SPOP在肾癌组织中过量表达并错误定位在细胞质里。胞质型SPOP通过泛素化通路降解肿瘤抑制因子PTEN等,从而导致肾癌产生。我们运用基于结构的计算机虚拟筛选和结构优化,获得SPOP的小分子抑制剂。这一化合物有效干预SPOP/PTEN等蛋白质相互作用、抑制SPOP介导的肿瘤发生信号通路,选择性杀死依赖于胞质SPOP的癌细胞,并对正常肾细胞HK-2影响较小。裸鼠移植瘤实验和临床癌组织原代细胞实验均表明SPOP小分子抑制剂治疗肾透明细胞癌的效果。该研究验证了SPOP/蛋白质相互作用是一个新类型、特异性治疗肾透明细胞癌的靶向性策略,将推动相关领域的创新药物发现。
Dysregulation of ubiquitin signaling is associated with multiple cancer development;however,no therapeutic treatment that targets ubiquitin signaling has succeeded into market.The E3 ligase adaptor SPOP is overexpressed in virtually all ccRCC and promotes tumorigenesis by acting a key regulatory hub.Our work has identified a small-molecule inhibitor that disrupts SPOP-substrate protein interactions,prevents ubiquitination and degradation of the oncogenic SPOP substrates,and kills human ccRCC cells.These results have demonstrated that targeting SPOP might be specific to kidney cancer,and the small-molecule inhibitors would be potential candidates for a targeted therapy of ccRCC.
引文
[1]Liu,J.,et al.,Science.2009,323,1218-1222.
    [2]Li G.Q.,et al.,Cancer Cell.2014,25,455-468.

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