The NAD+ salvage pathway modulates cancer cell viability via p73

T. Sharif, D. G. Ahn, R. Z. Liu, E. Pringle, E. Martell, C. Dai, A. Nunokawa, M. Kwak, D. Clements, J. P. Murphy, C. Dean, P. Marcato, C. McCormick, R. Godbout, S. A. Gujar, P. W.K. Lee

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55 Citas (Scopus)

Resumen

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.

Idioma originalEnglish
Páginas (desde-hasta)669-680
Número de páginas12
PublicaciónCell Death and Differentiation
Volumen23
N.º4
DOI
EstadoPublished - abr. 1 2016

Nota bibliográfica

Funding Information:
Acknowledgements. This work was supported by grants from the Canadian Institute of Health Research (CIHR) (to SAG, PWKL, PM and CM), from the Canadian Breast Cancer Foundation – Atlantic (to SAG and PWKL) and from the Canadian Breast Cancer Foundation – Prairies/NWT (to RG). SAG was supported by a CIHR Postdoctoral Fellowship. D-GA, EP, DC and PM are supported by the CIHR-Cancer Research Training Program and the Beatrice Hunter Cancer Research Institute (BHCRI). DC also received support from the Nova Scotia Health Research Foundation, and AN received a Norah Stephen Oncology Award from BHCRI.

Publisher Copyright:
© 2016 Macmillan Publishers Limited All rights reserved.

ASJC Scopus Subject Areas

  • Molecular Biology
  • Cell Biology

PubMed: MeSH publication types

  • Journal Article
  • Research Support, Non-U.S. Gov't

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