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Novel SIRT Inhibitor, MHY2256, Induces Cell Cycle Arrest, Apoptosis, and Autophagic Cell Death in HCT116 Human Colorectal Cancer Cells  

Kim, Min Jeong (Division of Pharmacy, College of Pharmacy, Pusan National University)
Kang, Young Jung (Division of Pharmacy, College of Pharmacy, Pusan National University)
Sung, Bokyung (Division of Pharmacy, College of Pharmacy, Pusan National University)
Jang, Jung Yoon (Division of Pharmacy, College of Pharmacy, Pusan National University)
Ahn, Yu Ra (Division of Pharmacy, College of Pharmacy, Pusan National University)
Oh, Hye Jin (Division of Pharmacy, College of Pharmacy, Pusan National University)
Choi, Heejeong (Division of Pharmacy, College of Pharmacy, Pusan National University)
Choi, Inkyu (Division of Pharmacy, College of Pharmacy, Pusan National University)
Im, Eunok (Division of Pharmacy, College of Pharmacy, Pusan National University)
Moon, Hyung Ryong (Division of Pharmacy, College of Pharmacy, Pusan National University)
Chung, Hae Young (Division of Pharmacy, College of Pharmacy, Pusan National University)
Kim, Nam Deuk (Division of Pharmacy, College of Pharmacy, Pusan National University)
Publication Information
Biomolecules & Therapeutics / v.28, no.6, 2020 , pp. 561-568 More about this Journal
We examined the anticancer effects of a novel sirtuin inhibitor, MHY2256, on HCT116 human colorectal cancer cells to investigate its underlying molecular mechanisms. MHY2256 significantly suppressed the activity of sirtuin 1 and expression levels of sirtuin 1/2 and stimulated acetylation of forkhead box O1, which is a target protein of sirtuin 1. Treatment with MHY2256 inhibited the growth of the HCT116 (TP53 wild-type), HT-29 (TP53 mutant), and DLD-1 (TP53 mutant) human colorectal cancer cell lines. In addition, MHY2256 induced G0/G1 phase arrest of the cell cycle progression, which was accompanied by the reduction of cyclin D1 and cyclin E and the decrease of cyclin-dependent kinase 2, cyclin-dependent kinase 4, cyclin-dependent kinase 6, phosphorylated retinoblastoma protein, and E2F transcription factor 1. Apoptosis induction was shown by DNA fragmentation and increase in late apoptosis, which were detected using flow cytometric analysis. MHY2256 downregulated expression levels of procaspase-8, -9, and -3 and led to subsequent poly(ADP-ribose) polymerase cleavage. MHY2256-induced apoptosis was involved in the activation of caspase-8, -9, and -3 and was prevented by pretreatment with Z-VAD-FMK, a pan-caspase inhibitor. Furthermore, the autophagic effects of MHY2256 were observed as cytoplasmic vacuolation, green fluorescent protein-light-chain 3 punctate dots, accumulation of acidic vesicular organelles, and upregulated expression level of light-chain 3-II. Taken together, these results suggest that MHY2256 could be a potential novel sirtuin inhibitor for the chemoprevention or treatment of colorectal cancer or both.
SIRT inhibitor; MHY2256; Colorectal cancer cells; Cell cycle arrest; Apoptosis; Autophagy;
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