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Namballa, Hari Krishna; Anchi, Pratibha; Lakshmi Manasa, Kesari; Soni, Jay Prakash; Godugu, Chandraiah; Shankaraiah, Nagula; Kamal, Ahmed
Bioorganic chemistry, December 2021, 2021-12-00, Volume: 117Journal Article
Display omitted •A series of β-carboline-cinnamide conjugates was synthesized as cytotoxic agents.•Compound 7h displayed potent IC50 of 0.70 µM in HCT-15, Entinostat IC50 of 3.87 µM.•Immunoblot analysis showed that the compound 7h is class I selective HDAC inhibitor.•Molecular docking revealed that 7h bind nicely within active pocket of the HDAC 2.•7h can be promising lead for development of potentially inhibiting HDAC inhibitors. The effect of β-carboline motif as cap for HDAC inhibitors containing cinnamic acid as linker and benzamides as zinc binding group was examined in this study. A series of β-carboline-cinnamide conjugates have been synthesized and evaluated for their HDAC inhibitory activity and in vitro cytotoxicity against different human cancer cell lines. Almost all the compounds exhibited superior HDAC inhibitory activity than the standard drug Entinostat for in vitro enzymatic assay. Among the tested compounds, 7h displayed a noteworthy potency with an IC50 value of 0.70 ± 0.15 µM against HCT-15 cell line when compared to the standard drug Entinostat (IC50 of 3.87 ± 0.62 µM). The traditional apoptosis assays such as nuclear morphological alterations, AO/EB, DAPI, and Annexin-V/PI staining revealed the antiproliferative activity of 7h while depolarization of mitochondrial membrane potential by JC-1 was observed in dose-dependent manner. Cell cycle analysis also unveiled the typical accumulation of cells in G2M phase and sub-G1/S phase arrest. In addition, immunoblot analysis for compound 7h on HCT-15 indicated selective inhibition of the protein expression of class I HDAC 2 and 3 isoforms. Molecular docking analysis of compound 7h revealed that it can prominent binding with the active pocket of the HDAC 2. These finding suggest that the compound 7h can be a promising lead candidate for further investigation in the development of novel anti-cancer drug potentially inhibiting HDACs.
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