title: Novel small-molecule SIRT1 inhibitors induce cell death in adult T-cell leukaemia cells.
abstract: Adult T-cell leukaemia/lymphoma (ATL) is an aggressive T-cell malignancy that develops after long-term infection with human T-cell leukaemia virus (HTLV)-1. The identification of new molecular targets for ATL prevention and treatment is desired. SIRT1, a nicotinamide adenine dinucleotide(+) -dependent histone/protein deacetylase, plays crucial roles in various physiological processes, including aging and apoptosis. We previously reported that ATL patients had significantly higher SIRT1 protein levels than healthy controls. Here, we demonstrate that two novel small-molecule SIRT1 inhibitors, NCO-01/04, reduced cell viability and enhanced apoptotic cells in peripheral blood monocyte cells of patients with acute ATL, which has a poor prognosis. NCO-01/04 also reduced the cell viability with DNA fragmentation, Annexin V-positive cells, and caspase activation. However, a caspase inhibitor did not inhibit this caspase-dependent cell death. NCO-01/04 enhanced the endonuclease G level in the nucleus with loss of the mitochondrial transmembrane potential, which can promote caspase-independent death. Interestingly, NCO-01/04 increased the LC3-II-enriched protein fraction, indicating autophagosome accumulation as well as autophagy. Thus, NCO-01/04 simultaneously caused caspase activation and autophagy. These results suggest that NCO-01/04 is highly effective against ATL cells in caspase-dependent or -independent manners with autophagy, and that its clinical application might improve the prognosis of patients with this fatal disease.
authors.affiliation: Department of Biochemistry, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Kozako
authors.affiliation: Faculty of Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Suzuki
authors.affiliation: 1] Department of Hematology and Immunology, Kagoshima University Hospital, Kagoshima, Japan [2] Division of Hematology and Immunology, Center for Chronic Viral Diseases, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Yoshimitsu
authors.affiliation: Department of Biochemistry, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Uchida
authors.affiliation: Division of Hematology and Immunology, Center for Chronic Viral Diseases, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
authors.forename: Ayako
authors.initials: A
authors.lastname: Kuroki
authors.affiliation: Department of Biochemistry, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan.
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Aikawa
authors.affiliation: Department of Biochemistry, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan.
authors.forename: Shin-ichiro
authors.initials: S
authors.lastname: Honda
authors.affiliation: 1] Department of Hematology and Immunology, Kagoshima University Hospital, Kagoshima, Japan [2] Division of Hematology and Immunology, Center for Chronic Viral Diseases, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
authors.forename: Naomichi
authors.initials: N
authors.lastname: Arima
authors.affiliation: Department of Biochemistry, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Soeda
mesh_terms: D000107:Acetylation / Q000187:drug effects; D017304:Annexin A5 / Q000378:metabolism; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects; D001343:Autophagy / Q000187:drug effects; D020169:Caspases / Q000378:metabolism; D016923:Cell Death / Q000187:drug effects*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D056572:Histone Deacetylase Inhibitors / Q000494:pharmacology*; D006657:Histones / Q000378:metabolism; D006801:Humans; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000378:metabolism*; D007963:Leukocytes, Mononuclear / Q000378:metabolism; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D017382:Reactive Oxygen Species / Q000378:metabolism; D056564:Sirtuin 1 / Q000037:antagonists & inhibitors* / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D017304:Annexin A5; D000970:Antineoplastic Agents; D056572:Histone Deacetylase Inhibitors; D006657:Histones; D017382:Reactive Oxygen Species; D020169:Caspases; D056564:Sirtuin 1