CEM human lymphoblastic leukemia cell line and its MDR variants, CEM/VLB55–8, and CEM/VLB100 [33 (link)], HeyA8 human ovarian cancer cell line and its MDR subline HeyA8-MDR, MCF-7 human breast cancer cell line and its MDR variant MCF7-MDR (originally named MCF-7/Adr) cells [34 (link)] were kindly provided by Dr. Fiedler (MD Anderson, TX, USA). 17-AAG and AUY922 were purchased from Enzo Life Sciences Inc. (Farmingdale, New York, USA) and Selleck Chemicals (Houston, TX, USA), respectively. EX527 was purchased from BioVision Inc. (Milpitas, CA, USA). Amurensin G, a natural SIRT1 inhibitor, was supplied Dr. Oh (Seoul National University, Seoul, Korea) as described previously [35 (link)].
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