Defects in signal transduction pathways in chronic B lymphocytic leukemia cells.

Abstract:

:B chronic lymphocytic leukemia (B-CLL) and hairy cell leukemia (HCL) cells are refractory to many of the signals which activate normal B cells but are stimulated to proliferate by tumor necrosis factor (TNF). Cell signalling by TNF is mediated in part by the induction of the transcription factor families AP-1 and NF-kappa B. In some cellular contexts, these factors play a role in regulating cell cycle transit. AP-1 binds DNA as dimers of jun and fos family proteins and is regulated by a cascade of protein kinases which eventually activate a mitogen-activated protein kinase (MAP kinase) and also by protein kinase C. Three pathways have been implicated in the activation of NF-kappa B by extracellular ligands. 1, the activation of protein kinase C by diacylglycerol generated by ligand-mediated activation of phosphatidylcholine hydrolysis, 2, stimulation of specific protein kinases by ceramide generated following activation of a sphingomyelinase by diacylglycerol and 3, a novel pathway involving ligand-induced generation of free radical species. In B-CLL and HCL cells, the generation of nuclear-localized c-jun and c-fos proteins (components of AP-1) in response to TNF or PMA appears to be blocked. Whereas PMA failed to induce NF-kappa B in these cells, this factor was readily induced by TNF. TNF induction of NF-kappa B was abolished by antioxidants, suggesting involvement of the free radical pathway. The data discussed here suggest defects in coupling of some protein kinase C-dependent pathways in B-CLL and HCL cells and that TNF is able to bypass these blocks by the activation of NF-kappa B via a free radical-dependent pathway which is independent of protein kinase C.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Leuk Lymphoma

journal_title

Leukemia & lymphoma

authors

Jabbar SA,Hoffbrand AV,Wickremasinghe RG

doi

10.3109/10428199509064938

subject

Has Abstract

pub_date

1995-06-01 00:00:00

pages

163-70

issue

1-2

eissn

1042-8194

issn

1029-2403

journal_volume

18

pub_type

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