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To assess the functional significance of AKT inactivation in the activity of this regimen, SUDHL16 cells expressing a constitutively active (myristolated) form of AKT were employed as before (Dasmahapatra et?al, 2012). Two clones (SUDHL16 CA-AKT Cl 2 and Cl 6) expressed clear increases in phospho-AKT and GSK-3��/�� compared to empty vector controls (Fig?4A, inset). These clones were significantly more resistant to PCI-32765/bortezomib-mediated cell death than controls (P? http://www.selleckchem.com/products/PD-0325901.html or the commercially available AKT inhibitor, AKTi, http://www.selleckchem.com/products/epz-6438.html significantly potentiated bortezomib lethality relative to bortezomib treatment alone in SUDHL6 cells (Fig?4C). On the other hand, little change in p-ERK was observed in mutant or empty-vector controls with combined treatment. In separate studies, ectopic expression of constitutively active MEK1/2 did not significantly diminish bortezomib/PCI32765 activity (data not shown), arguing against the likelihood that ERK1/2 inactivation plays a significant role in the activity of this regimen. Together, these findings argue that inactivation of AKT contributes functionally to the activity of the PCI-32765/bortezomib regimen. The effects of combining PCI-32765 and bortezomib on NF-��B activation was then assessed in SUDHL6 and OCI-LY10 cells. EMSA analysis revealed that exposure (24?h) of cells to minimally toxic concentrations of PCI-32765 (6�C7��5?��mol/l) or bortezomib (3�C8?nmol/l) individually resulted in reductions in DNA binding activity (Fig?5A). http://www.selleck.cn/products/JNJ-26481585.html Quantification of NF-��B activation by ELISA assay revealed that NF-��B activity after combined exposure to both agents was significantly less than activity in cells exposed to only one agent for both GC- (SUDHL6) as well as ABC- (OCI-LY10) DLBCL cells (P?