Transcription factor NF-kappaB is constitutively activated in acute lymphoblastic leukemia cells

Item Type:	Article
Title:	Transcription factor NF-kappaB is constitutively activated in acute lymphoblastic leukemia cells
Creators Name:	Kordes, U. and Krappmann, D. and Heissmeyer, V. and Ludwig, W.D. and Scheidereit, C.
Abstract:	The pleiotropic transcription factor NF-kappaB controls cellular apoptotic and growth processes and increasing evidence suggests a role in tumorigenesis. We describe here that constitutively activated NF-kappaB complexes are found in the vast majority (39 out of 42 samples) of childhood acute lymphoblastic leukemia (ALL) without any subtype restriction. Electrophoretic shift analysis further demonstrates that these complexes are composed of p50-p50 and p65-p50 dimers. Proteasome inhibition in primary ALL cultures results in a hyperphosphorylated form of IkappaBalpha, indicating that activation of upstream kinases, which trigger IkappaBalpha degradation, has led to nuclear translocation of NF-kappaB. Careful inhibition of cellular proteolytic activities is of importance when analyzing extracts from primary ALL cells. Degradation of p65 and other proteins in ALL samples could be specifically suppressed by alpha-1 antitrypsin. Constitutive NF-kappaB activation is thus a common characteristic of childhood ALL and strongly suggests a critical role of this factor for leukemia cell survival.
Keywords:	Acute Lymphoblastic Leukemia, Transcription Factors, Kinases
Source:	Leukemia
ISSN:	0887-6924
Publisher:	Nature Publishing Group
Volume:	14
Number:	3
Page Range:	399-402
Date:	March 2000
Official Publication:	http://www.nature.com/leu/journal/v14/n3/abs/2401705a.html
PubMed:	View item in PubMed

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