Journal
EMBO MOLECULAR MEDICINE
Volume 4, Issue 10, Pages 1087-1096Publisher
WILEY-BLACKWELL
DOI: 10.1002/emmm.201201250
Keywords
breast cancer; NAMPT; PARP inhibitor; triple negative; beta-NAD(+)
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Funding
- Breakthrough Breast Cancer
- Cancer Research UK
- AACR as part of the Stand Up to Cancer Breast Cancer Dream Team
- NHS
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PARP inhibitors have been proposed as a potential targeted therapy for patients with triple-negative (ER-, PR-, HER2-negative) breast cancers. However, it is as yet unclear as to whether single agent or combination therapy using PARP inhibitors would be most beneficial. To better understand the mechanisms that determine the response to PARP inhibitors, we investigated whether enzymes involved in metabolism of the PARP substrate, beta-NAD(+), might alter the response to a clinical PARP inhibitor. Using an olaparib sensitization screen in a triple-negative (TN) breast cancer model, we identified nicotinamide phosphoribosyltransferase (NAMPT) as a non-redundant modifier of olaparib response. NAMPT is a rate-limiting enzyme involved in the generation of the PARP substrate beta-NAD(+) and the suppression of beta-NAD(+) levels by NAMPT inhibition most likely explains these observations. Importantly, the combination of a NAMPT small molecule inhibitor, FK866, with olaparib inhibited TN breast tumour growth in vivo to a greater extent than either single agent alone suggesting that assessing NAMPT/PARP inhibitor combinations for the treatment of TN breast cancer may be warranted.
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