HMCL exhibit prosurvival stress responses following treatment with PKC412. (A) Treatment with PKC412 (5 μM) induces expression of HSP70 as measured by flow cytometry (⊡ indicates NCI-H929; ▪, LP-1; *P = .023 and .026, respectively, versus DMSO treatment). Graph represents data from 3 individual experiments. (B) Treatment with PKC412 (5 μM) induces expression of HSP90 as measured by flow cytometry (⊡ indicates NCI-H929; ▪, LP-1; *P = .020 and .027, respectively, versus DMSO treatment). Graph represents data from 3 individual experiments. (C) PKC412 treatment of the HMCL NCI-H929 induces NFκB activation as determined by p50/p65 nuclear translocation. Increased NFκB nuclear translocation is dose (1 μM versus 3 μM) and time (24 versus 72 hours) dependent (⊡ indicates NCI-H929; ▪, LP-1). Graph represents data from 3 individual experiments (bortezomib [B] was included as a negative control). (D) PKC412 (P) (5 μM) treatment induces transcriptional activation of NFκB as determined by luciferase assay (measured after 18 hours of treatment) (⊡ indicates NCI-H929). Graph represents data from 3 individual experiments). Error bars for all graphs indicate SEM.