Optimization of Class I Histone Deacetylase PROTACs Reveals that HDAC1/2 Degradation is Critical to Induce Apoptosis and Cell Arrest in Cancer Cells,Journal of Medicinal Chemistry

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Optimization of Class I Histone Deacetylase PROTACs Reveals that HDAC1/2 Degradation is Critical to Induce Apoptosis and Cell Arrest in Cancer Cells
Journal of Medicinal Chemistry ( IF 6.8 ) Pub Date : 2022-03-16 , DOI: 10.1021/acs.jmedchem.1c02179
Joshua P Smalley ₁ , India M Baker ₂ , Wiktoria A Pytel ₁ , Li-Ying Lin ₃ , Karen J Bowman ₂ , John W R Schwabe ₃ , Shaun M Cowley ₂ , James T Hodgkinson ₁

Affiliation

Class I histone deacetylase (HDAC) enzymes 1, 2, and 3 organize chromatin as the catalytic subunits within seven distinct multiprotein corepressor complexes and are established drug targets. We report optimization studies of benzamide-based Von Hippel–Lindau (VHL) E3-ligase proteolysis targeting chimeras (PROTACs) and for the first time describe transcriptome perturbations resulting from these degraders. By modifying the linker and VHL ligand, we identified PROTACs 7, 9, and 22 with submicromolar DC₅₀ values for HDAC1 and/or HDAC3 in HCT116 cells. A hook effect was observed for HDAC3 that could be negated by modifying the position of attachment of the VHL ligand to the linker. The more potent HDAC1/2 degraders correlated with greater total differentially expressed genes and enhanced apoptosis in HCT116 cells. We demonstrate that HDAC1/2 degradation by PROTACs correlates with enhanced global gene expression and apoptosis, important for the development of more efficacious HDAC therapeutics with reduced side effects.

中文翻译：

I 类组蛋白脱乙酰酶 PROTAC 的优化表明 HDAC1/2 降解对于诱导癌细胞凋亡和细胞停滞至关重要

I 类组蛋白脱乙酰酶 (HDAC) 酶 1、2 和 3 将染色质组织为七种不同的多蛋白辅阻遏物复合物中的催化亚基，并且是既定的药物靶标。我们报告了基于苯甲酰胺的 Von Hippel–Lindau (VHL) E3 连接酶蛋白水解靶向嵌合体 (PROTAC) 的优化研究，并首次描述了由这些降解剂引起的转录组扰动。通过修饰接头和 VHL 配体，我们鉴定了具有亚微摩尔 DC _{50的 PROTAC}7、9和22HCT116 细胞中 HDAC1 和/或 HDAC3 的值。观察到 HDAC3 的钩状效应，可以通过修改 VHL 配体与接头的连接位置来消除这种效应。更有效的 HDAC1/2 降解剂与更大的总差异表达基因和增强的 HCT116 细胞凋亡相关。我们证明 PROTAC 对 HDAC1/2 的降解与增强的全局基因表达和细胞凋亡相关，这对于开发更有效且副作用更少的 HDAC 疗法非常重要。

更新日期：2022-03-16

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