Discovery of a New Isoxazole-3-hydroxamate-Based Histone Deacetylase 6 Inhibitor SS-208 with Antitumor Activity in Syngeneic Melanoma Mouse Models
作者:Sida Shen、Melissa Hadley、Kseniya Ustinova、Jiri Pavlicek、Tessa Knox、Satish Noonepalle、Mauricio T. Tavares、Chad A. Zimprich、Guiping Zhang、Matthew B. Robers、Cyril Bařinka、Alan P. Kozikowski、Alejandro Villagra
DOI:10.1021/acs.jmedchem.9b00946
日期:2019.9.26
phenylhydroxamate-based inhibitors. While SS-208 has minimal effects on the viability of murine SM1 melanoma cells in vitro, it significantly reduced in vivo tumor growth in a murine SM1 syngeneic melanoma mouse model. These findings suggest that the antitumor activity of SS-208 is mainly mediated by immune-related antitumor activity as evidenced by the increased infiltration of CD8+ and NK+ T cells and the enhanced
异恶唑是五元杂环,广泛用于药物开发中。在这里,我们报告SS-208的设计,合成以及结构和生物学特性,SS-208是一种新型的HDAC6选择性抑制剂,含有异恶唑-3-异羟肟酸酯部分作为锌结合基团以及疏水性接头。Danio rerio的晶体结构HDAC6 / SS-208配合物揭示了活性位点锌离子的双齿配位,这与使用苯基异羟肟酸酯基抑制剂的HDAC6配合物观察到的优选单齿配位不同。尽管SS-208对鼠SM1黑色素瘤细胞的体外活力影响很小,但在鼠SM1同基因黑素瘤小鼠模型中,它显着降低了体内肿瘤的生长。这些发现表明,SS-208的抗肿瘤活性主要由免疫相关的抗肿瘤活性介导,如肿瘤微环境中CD8 +和NK + T细胞浸润的增加以及M1和M2巨噬细胞比例的增加所证明。