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The NAD(+) salvage pathway modulates cancer cell viability via p73.
Sharif, T; Ahn, D-G; Liu, R-Z; Pringle, E; Martell, E; Dai, C; Nunokawa, A; Kwak, M; Clements, D; Murphy, J P; Dean, C; Marcato, P; McCormick, C; Godbout, R; Gujar, S A; Lee, P W K.
Afiliación
  • Sharif T; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Ahn DG; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Liu RZ; Department of Oncology, University of Alberta, Edmonton, AB, Canada.
  • Pringle E; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Martell E; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Dai C; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Nunokawa A; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Kwak M; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Clements D; Department of Pathology, Dalhousie University, Halifax, NS, Canada.
  • Murphy JP; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Dean C; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Marcato P; Department of Pathology, Dalhousie University, Halifax, NS, Canada.
  • McCormick C; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Godbout R; Department of Oncology, University of Alberta, Edmonton, AB, Canada.
  • Gujar SA; Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada B3H 4R2.
  • Lee PW; Strategy and Organizational Performance, IWK Health Centre, Halifax, NS, Canada.
Cell Death Differ ; 23(4): 669-80, 2016 Apr.
Article en En | MEDLINE | ID: mdl-26586573
The involvement of the nicotinamide adenine dinucleotide (NAD(+)) salvage pathway in cancer cell survival is poorly understood. Here we show that the NAD(+) salvage pathway modulates cancer cell survival through the rarely mutated tumour suppressor p73. Our data show that pharmacological inhibition or knockdown of nicotinamide phosphoribosyltransferase (NAMPT), a rate-limiting enzyme in the NAD(+) salvage pathway, enhances autophagy and decreases survival of cancer cells in a p53-independent manner. Such NAMPT inhibition stabilizes p73 independently of p53 through increased acetylation and decreased ubiquitination, resulting in enhanced autophagy and cell death. These effects of NAMPT inhibition can be effectively reversed using nicotinamide mononucleotide (NMN), the enzymatic product of NAMPT. Similarly, knockdown of p73 also decreases NAMPT inhibition-induced autophagy and cell death, whereas overexpression of p73 alone enhances these effects. We show that the breast cancer cell lines (MCF-7, MDA-MB-231 and MDA-MB-468) harbour significantly higher levels of NAMPT and lower levels of p73 than does the normal cell line (MCF-10A), and that NAMPT inhibition is cytotoxic exclusively to the cancer cells. Furthermore, data from 176 breast cancer patients demonstrate that higher levels of NAMPT and lower levels of p73 correlate with poorer patient survival, and that high-grade tumours have significantly higher NAMPT/p73 mRNA ratios. Therefore, the inverse relationship between NAMPT and p73 demonstrable in vitro is also reflected from the clinical data. Taken together, our studies reveal a new NAMPT-p73 nexus that likely has important implications for cancer diagnosis, prognosis and treatment.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Autofagia / Citocinas / Proteína p53 Supresora de Tumor / Nicotinamida Fosforribosiltransferasa / Proteína Tumoral p73 / NAD / Neoplasias Tipo de estudio: Prognostic_studies Límite: Humans Idioma: En Revista: Cell Death Differ Año: 2016 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Autofagia / Citocinas / Proteína p53 Supresora de Tumor / Nicotinamida Fosforribosiltransferasa / Proteína Tumoral p73 / NAD / Neoplasias Tipo de estudio: Prognostic_studies Límite: Humans Idioma: En Revista: Cell Death Differ Año: 2016 Tipo del documento: Article Pais de publicación: Reino Unido