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- W4313347864 endingPage "4391" @default.
- W4313347864 startingPage "4383" @default.
- W4313347864 abstract "Abstract Ig heavy chain class switching to IgE is directed by IL-4 and IL-13 by inducing transcription from the IgE germline promoter. A crucial transcription factor in this process is STAT6, which binds to a specific DNA element upon cytokine activation. In this paper it is shown that the B cell- and monocyte-specific factor PU.1 interacts with a closely spaced sequence in the human IgE germline promoter that overlaps with a previously described binding site for NFκB/rel. The authenticity of PU.1 was demonstrated by specific competition and supershifts in EMSA experiments. In addition, in vitro translated PU.1 could interact with an oligonucleotide derived from the IgE germline promoter containing the PU.1 binding site and migrated with the same mobility compared with the complex formed with nuclear extracts. Transient transfection experiments using IgE germline promoter reporter gene constructs demonstrated that mutations affecting DNA binding of PU.1 or NFκB/rel had no or little effect on IL-4 inducibility of these plasmids. However, point mutations that abolished binding of both factors abrogated cytokine inducibility. No strict spacing of the STAT6 and the composite PU.1/NF-κB elements is required for IL-4 induction. IL-4-induced STAT6 DNA binding was retained in PU.1−/NFκB/rel− double mutants. The data demonstrate that cooperation of STAT6 with at least PU.1 or NFκB/rel is necessary for IL-4-induced activation of IgE germline gene transcription." @default.
- W4313347864 created "2023-01-06" @default.
- W4313347864 creator A5073862412 @default.
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- W4313347864 date "1999-10-15" @default.
- W4313347864 modified "2023-09-27" @default.
- W4313347864 title "Functional Synergism of STAT6 with Either NF-κB or PU.1 to Mediate IL-4-Induced Activation of IgE Germline Gene Transcription" @default.
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- W4313347864 doi "https://doi.org/10.4049/jimmunol.163.8.4383" @default.
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