Activation of the B-cell receptor successively activates NF-κB and STAT3 in chronic lymphocytic leukemia cells.

Abstract:

:In chronic lymphocytic leukemia (CLL) cells, both interleukin-6 (IL-6) and the B-cell receptor (BCR) activate Janus kinase 2 (JAK2) and induce the phosphorylation of signal transduction and activator of transcription 3 (STAT3) on tyrosine 705 residues. However, whereas IL-6 phosphorylates STAT3 within 15 min, stimulation of the BCR with anti-immunoglobulin M (IgM) antibodies phosphorylates STAT3 in 2-4 hr. Here, we show that this process takes longer because it requires transcriptional activity of NF-κB. Using an electromobility shift assay, we found that incubation with IgM antibodies for 4 or 18 hr, but not 15 min, increased NF-κB DNA-binding of CLL cells and increased binding was translated to increased transcriptional activity. Hence, 42% of the 83 NF-κB target genes were constitutively expressed in all CLL cells prior to any inducible stimuli. However, activation of the BCR increased the number of NF-κB target genes with detectable expression by 23%. Remarkably, prolonged incubation with anti-IgM antibodies induced a time-dependent transcription, production and secretion of IL-6 protein. The IgM-induced production of IL-6 prompted the phosphorylation of STAT3 on tyrosine residues. This effect was inhibited by the JAK1/2 inhibitor of the JAK/STAT3 pathway ruxolitinib. Taken together, these results suggest that in CLL cells, constitutive tonic activation of NF-κB can be further enhanced by the BCR and that the BCR-induced activation of the JAK/STAT3 pathway depends on the NF-κB induced production of IL-6.

journal_name

Int J Cancer

authors

Rozovski U,Harris DM,Li P,Liu Z,Jain P,Veletic I,Ferrajoli A,Burger J,Thompson P,Jain N,Wierda W,Keating MJ,Estrov Z

doi

10.1002/ijc.30892

subject

Has Abstract

pub_date

2017-11-15 00:00:00

pages

2076-2081

issue

10

eissn

0020-7136

issn

1097-0215

journal_volume

141

pub_type

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