Design, Synthesis and Structure-Activity Relationship Studies of Novel Survivin Inhibitors with Potent Anti-Proliferative Properties
作者:Min Xiao、Jin Wang、Zongtao Lin、Yan Lu、Zhenmei Li、Stephen W. White、Duane D. Miller、Wei Li
DOI:10.1371/journal.pone.0129807
日期:——
The anti-apoptotic protein survivin is highly expressed in most human cancer cells, but has very low expression in normal differentiated cells. Thus survivin is considered as an attractive cancer drug target. Herein we report the design and synthesis of a series of novel survivin inhibitors based on the oxyquinoline scaffold from our recently identified hit compound UC-112. These new analogs were tested against a panel of cancer cell lines including one with multidrug-resistant phenotype. Eight of these new UC-112 analogs showed IC50 values in the nanomole range in anti-proliferative assays. The best three compounds among them along with UC-112 were submitted for NCI-60 cancer cell line screening. The results indicated that structural modification from UC-112 to our best compound 4g has improved activity by four folds (2.2 μM for UC-112 vs. 0.5 μM for 4g, average GI50 values over all cancer cell lines in the NCI-60 panel).Western blot analyses demonstrated the new compounds maintained high selectivity for survivin inhibition over other members in the inhibition of apoptosis protein family. When tested in an A375 human melanoma xenograft model, the most active compound 4g effectively suppressed tumor growth and strongly induced cancer cell apoptosis in tumor tissues. This novel scaffold is promising for the development of selective survivin inhibitors as potential anticancer agents.
抗凋亡蛋白 survivin 在大多数人类癌细胞中高度表达,但在正常分化细胞中表达极低。因此,survivin被认为是一个有吸引力的抗癌药物靶点。本文报告了我们最近发现的 hit 化合物 UC-112 为基础的噁喹啉骨架的一系列新型 survivin 抑制剂的设计和合成。这些新类似物针对包括具有多药耐药性表型在内的多种癌细胞系进行了测试。其中八个新的 UC-112 类似物在抗增殖实验中显示出纳摩尔范围内的 IC50 值。其中最好的三个化合物连同 UC-112 一起提交给 NCI-60 癌细胞系筛选。结果表明,从 UC-112 到我们最佳化合物 4g 的结构修饰使活性提高了四倍(UC-112 为 2.2 μM,4g 为 0.5 μM,NCI-60 面板中所有癌细胞系的平均 GI50 值)。Western blot 分析表明,这些新化合物在抑制凋亡蛋白家族其他成员方面对 survivin 抑制保持了高选择性。在 A375 人类黑色素瘤异种移植模型中测试时,活性最高的化合物 4g 有效地抑制了肿瘤生长并在肿瘤组织中强烈诱导癌细胞凋亡。这种新型骨架有望开发出选择性 survivin 抑制剂作为潜在的抗癌药物。