Synthetic lethality of PARP and NAMPT inhibition in triple‐negative breast cancer cells

EMBO Molecular Medicine

Ilirjana Bajrami²  Asha Kigozi²  Antoinette Van Weverwijk²  Rachel Brough²  Jessica Frankum²  Christopher J. Lord¹ 

[1] E-mail address: 关键词: breast cancer;    NAMPT;    PARP inhibitor;    triple negative;    β‐NAD+;   

DOI  :  10.1002/emmm.201201250

来源: Wiley

【 摘 要 】

Abstract

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, β-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 β-NAD⁺ and the suppression of β-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.

【 授权许可】

CC BY   
Copyright © 2012 EMBO Molecular Medicine

Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.