Transcriptional repression of Stat6-dependent interleukin-4-induced genes by BCL-6: specific regulation of Iɛ transcription and immunoglobulin E switching

MB Harris, CC Chang, MT Berton… - … and cellular biology, 1999 - Taylor & Francis
MB Harris, CC Chang, MT Berton, NN Danial, J Zhang, D Kuehner, BH Ye, M Kvatyuk…
Molecular and cellular biology, 1999Taylor & Francis
The BCL-6 proto-oncogene encodes a POZ/zinc-finger transcription factor that is expressed
in B cells and a subset of CD4+ T cells within germinal centers. Recent evidence suggests
that BCL-6 can act as a sequence-specific repressor of transcription, but the target genes for
this activity have not yet been identified. The binding site for BCL-6 shares striking homology
to the sites that are the target sequence for the interleukin-4 (IL-4)-induced Stat6 (signal
transducers and activators of transcription) signaling molecule. Electrophoretic mobility shift …
The BCL-6 proto-oncogene encodes a POZ/zinc-finger transcription factor that is expressed in B cells and a subset of CD4+ T cells within germinal centers. Recent evidence suggests that BCL-6 can act as a sequence-specific repressor of transcription, but the target genes for this activity have not yet been identified. The binding site for BCL-6 shares striking homology to the sites that are the target sequence for the interleukin-4 (IL-4)-induced Stat6 (signal transducers and activators of transcription) signaling molecule. Electrophoretic mobility shift assays demonstrate that BCL-6 can bind, with different affinities, to several DNA elements recognized by Stat6. Expression of BCL-6 can repress the IL-4-dependent induction of immunoglobulin (Ig) germ line ɛ transcripts, but does not repress the IL-4 induction of CD23 transcripts. Consistent with the role of BCL-6 in modulating transcription from the germ line ɛ promoter, BCL-6−/−mice display an increased ability to class switch to IgE in response to IL-4 in vitro. These animals also exhibit a multiorgan inflammatory disease characterized by the presence of a large number of IgE+ B cells. The apparent dysregulation of IgE production is abolished in BCL-6−/− Stat6−/− mice, indicating that BCL-6 regulation of Ig class switching is dependent upon Stat6 signaling. Thus, BCL-6 can modulate the transcription of selective Stat6-dependent IL-4 responses, including IgE class switching in B cells.
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