Transcription factor NF-kappaB is constitutively activated in acute lymphoblastic leukemia cells.
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Transcription factor NF-kappaB is constitutively activated in acute lymphoblastic leukemia cells. / Kordes, Uwe; Krappmann, D; Heissmeyer, V; Ludwig, W D; Scheidereit, C.
In: LEUKEMIA, Vol. 14, No. 3, 3, 2000, p. 399-402.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Transcription factor NF-kappaB is constitutively activated in acute lymphoblastic leukemia cells.
AU - Kordes, Uwe
AU - Krappmann, D
AU - Heissmeyer, V
AU - Ludwig, W D
AU - Scheidereit, C
PY - 2000
Y1 - 2000
N2 - 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.
AB - 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.
M3 - SCORING: Zeitschriftenaufsatz
VL - 14
SP - 399
EP - 402
JO - LEUKEMIA
JF - LEUKEMIA
SN - 0887-6924
IS - 3
M1 - 3
ER -
