Design and synthesis of thiazole-based hydroxamate histone deacetylase inhibitors with potent antitumor efficacy by inducing apoptosis, pyroptosis and cell cycle arrest

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The dysfunction of HDACs is closely related to tumorigenesis and development, which has emerged as an attractive target for cancer therapy. In this study, a series of thiazole-containing hydroxamate derivatives were designed and synthesized as novel HDAC inhibitors. Among these inhibitors, compounds 15a and 15d showed excellent inhibitory activities against HDAC1 and HepG2 cancer cell line, these two compounds increased the levels of acetylated histone H3 and H4. Moreover, 15a and 15d significantly arrested HepG2 cells at the G0/G1 phase. Additionally, these two compounds could induce apoptosis and pyroptosis. Moreover, 15a exhibited significant antitumor activity in the HepG2 xenograft model. Molecular docking and molecular dynamics simulation studies revealed the possible interaction mode of compound 15a with HDAC1. Besides, the preliminary pharmacokinetics study of compound 15a in vivo was evaluated. These results suggested that these novel thiazole-based HDAC inhibitors might become a promising scaffold for further structural optimization.