ARQ 531 is cytotoxic to CLL cells, decreases NF-κB function, and inhibits migration. ARQ 531 is cytotoxic to CLL cells, decreases NF-κB function, and inhibits.

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ARQ 531 is cytotoxic to CLL cells, decreases NF-κB function, and inhibits migration. ARQ 531 is cytotoxic to CLL cells, decreases NF-κB function, and inhibits migration. A, Primary CLL cells were continuously treated with increasing concentrations of ARQ 531 for 48 hours to assess cytotoxicity via annexin V/propidium iodide (PI) staining and flow cytometry (n = 9). B, Primary CLL cells were treated daily with ARQ 531 for 2 hours followed by drug washout and media replacement in order to simulate clearance of the reversible BTK inhibitor ARQ 531 (n = 9). C, Transcriptional expression of MYC, CD40, and MCL1 in CLL cells was assessed via real-time PCR following 72 hours of treatment with 1 μmol/L ARQ 531 (n = 7 for MYC; n = 8 for MCL1 and CD40). D and E, The NF-κB–dependent activation markers CD40 and CD86 were measured via flow cytometry 48 hours following treatment with 1 μmol/L ARQ 531 and 3.2 μmol/L CpG in CLL B cells (n = 9). MFI, mean fluorescence intensity. F and G, The number of CLL cells migrating through an 8.0-μm transwell insert toward the chemokines CXCL12 and CXCL13 was counted by flow cytometry (n = 8 for CXCL12; n = 9 for CXCL13). Differences were assessed using linear mixed-effects models (*, 0.05 ≥ P > 0.01; **, 0.01 ≥ P ≥ 0.001; ***, P < 0.001). Sean D. Reiff et al. Cancer Discov 2018;8:1300-1315 ©2018 by American Association for Cancer Research