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Blood, Vol. 94 No. 9 (November 1), 1999:
pp. 3129-3134
Overexpression of I Kappa B Alpha Without Inhibition of NF- B
Activity and Mutations in the I Kappa B Alpha Gene in
Reed-Sternberg Cells
Florian Emmerich,
Martina Meiser,
Michael Hummel,
Gudrun Demel,
Hans-Dieter Foss,
Franziska Jundt,
Stephan Mathas,
Daniel Krappmann,
Claus Scheidereit,
Harald Stein, and
Bernd Dörken
From Humboldt University of Berlin, Universitätsklinikum
Charité, Robert-Rössle-Klinik, Berlin; the Max
Delbrück Center for Molecular Medicine, Berlin; and the Institut
for Pathology, Universitätsklinikum Benjamin Franklin, Free
University Berlin, Berlin, Germany.
The transcription factor NF kappa B (NF- B) mediates the
expression of numerous genes involved in diverse functions such as inflammation, immune response, apoptosis, and cell proliferation. We
recently identified constitutive activation of NF- B (p50/p65) as a
common feature of Hodgkin/Reed-Sternberg (HRS) cells preventing these
cells from undergoing apoptosis and triggering proliferation. To
examine possible alterations in the NF- B/I B system, which might
be responsible for constitutive NF- B activity, we have analyzed the
inhibitor I kappa B alpha (I B ) in primary and cultured HRS cells
on protein, mRNA, and genomic levels. In lymph node biopsy samples from
Hodgkin's disease patients, I B mRNA proved to be strongly
overexpressed in the HRS cells. In 2 cell lines (L428 and KM-H2), we
detected mutations in the I B gene, resulting in C-terminally
truncated proteins, which are presumably not able to inhibit
NF- B-DNA binding activity. Furthermore, an analysis of the I B
gene in single HRS cells micromanipulated from frozen tissue sections
showed a monoallelic mutation in 1 of 10 patients coding for a
comparable C-terminally truncated I B protein. We suggest that the
observed I B mutations contribute to constitutive NF- B activity
in cultured and primary HRS cells and are therefore involved in the
pathogenesis of these Hodgkin's disease (HD) patients. The
demonstrated constitutive overexpression of I B in HRS cells evidences a deregulation of the NF- B/I B system also in the
remaining cases, probably due to defects in other members of the I B family.

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