title: Sirt1 inhibitor, Sirtinol, induces senescence-like growth arrest with attenuated Ras-MAPK signaling in human cancer cells.
abstract: The induction of senescence-like growth arrest has emerged as a putative contributor to the anticancer effects of chemotherapeutic agents. Clinical trials are underway to evaluate the efficacy of inhibitors for class I and II histone deacetylases to treat malignancies. However, a potential antiproliferative effect of inhibitor for Sirt1, which is an NAD(+)-dependent deacetylase and belongs to class III histone deacetylases, has not yet been explored. Here, we show that Sirt1 inhibitor, Sirtinol, induced senescence-like growth arrest characterized by induction of senescence-associated beta-galactosidase activity and increased expression of plasminogen activator inhibitor 1 in human breast cancer MCF-7 cells and lung cancer H1299 cells. Sirtinol-induced senescence-like growth arrest was accompanied by impaired activation of mitogen-activated protein kinase (MAPK) pathways, namely, extracellular-regulated protein kinase, c-jun N-terminal kinase and p38 MAPK, in response to epidermal growth factor (EGF) and insulin-like growth factor-I (IGF-I). Active Ras was reduced in Sirtinol-treated senescent cells compared with untreated cells. However, tyrosine phosphorylation of the receptors for EGF and IGF-I and Akt/PKB activation were unaltered by Sirtinol treatment. These results suggest that inhibitors for Sirt1 may have anticancer potential, and that impaired activation of Ras-MAPK pathway might take part in a senescence-like growth arrest program induced by Sirtinol.
authors.affiliation: Department of Anesthesia & Critical Care, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA.
authors.forename: H
authors.initials: H
authors.lastname: Ota
authors.forename: E
authors.initials: E
authors.lastname: Tokunaga
authors.forename: K
authors.initials: K
authors.lastname: Chang
authors.forename: M
authors.initials: M
authors.lastname: Hikasa
authors.forename: K
authors.initials: K
authors.lastname: Iijima
authors.forename: M
authors.initials: M
authors.lastname: Eto
authors.forename: K
authors.initials: K
authors.lastname: Kozaki
authors.forename: M
authors.initials: M
authors.lastname: Akishita
authors.forename: Y
authors.initials: Y
authors.lastname: Ouchi
authors.forename: M
authors.initials: M
authors.lastname: Kaneki
mesh_terms: D001549:Benzamides / Q000494:pharmacology*; D001943:Breast Neoplasms / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology; D016922:Cellular Senescence / Q000187:drug effects*; D004789:Enzyme Activation / Q000187:drug effects*; D004815:Epidermal Growth Factor / Q000494:pharmacology; D066246:ErbB Receptors / Q000378:metabolism; D011905:Genes, ras / Q000502:physiology*; D056572:Histone Deacetylase Inhibitors; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology; D008175:Lung Neoplasms / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D009284:Naphthols / Q000494:pharmacology*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D017395:Plasminogen Activator Inhibitor 1 / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D017526:Receptor, IGF Type 1 / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects*; D056564:Sirtuin 1; D037761:Sirtuins / Q000037:antagonists & inhibitors; D014407:Tumor Cells, Cultured; D014443:Tyrosine / Q000378:metabolism; D001616:beta-Galactosidase / Q000378:metabolism; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism*
chemical_list: D001549:Benzamides; D056572:Histone Deacetylase Inhibitors; D009284:Naphthols; D017395:Plasminogen Activator Inhibitor 1; C439060:sirtinol; D014443:Tyrosine; D004815:Epidermal Growth Factor; D007334:Insulin-Like Growth Factor I; D019869:Phosphatidylinositol 3-Kinases; D066246:ErbB Receptors; D017526:Receptor, IGF Type 1; D051057:Proto-Oncogene Proteins c-akt; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D048051:p38 Mitogen-Activated Protein Kinases; D001616:beta-Galactosidase; C447939:SIRT1 protein, human; D056564:Sirtuin 1; D037761:Sirtuins