Abstract:
:Stimulation of human tonsillar mononuclear cells with interleukin-4 (IL-4) and interferon-gamma (IFN-gamma) rapidly induced the activation of distinct nuclear factors with different mobilities, both of which bind the IL-4 response element (IL-4RE) of CD23b promoter as examined by electrophoretic mobility shift assays (EMSA). Co-treatment of IL-4 and IFN-gamma induced, in addition to the two distinct complexes, a new complex with an intermediate mobility. The IL-4-induced complex reacted with anti-STAT (signal transducers and activators of transcription) 6, resulting in a supershift whereas the formation of the IFN-gamma-induced complex was inhibited by anti-STAT 1. The intermediate complex appeared to react with both anti-STAT 6 and anti-STAT 1. Although IFN-gamma alone did not induce CD23 mRNA transcription, Northern blot analysis revealed a transient up-regulation of the IL-4-induced CD23 mRNA by IFN-gamma within 2 h of IFN-gamma treatment in these tonsillar cells. The results suggest that the IL-4RE of the IL-4-inducible gene can accommodate both IL-4- and IFN-gamma-activated factors, such as STAT 6 and STAT 1, either in homodimeric or heterodimeric forms and the binding of these different proteins to the respective promoter may play a potential regulatory role in the IL-4-inducible gene expression.
journal_name
Mol Immunoljournal_title
Molecular immunologyauthors
Park HJ,So EY,Lee CEdoi
10.1016/s0161-5890(98)00022-4subject
Has Abstractpub_date
1998-03-01 00:00:00pages
239-47issue
4eissn
0161-5890issn
1872-9142pii
S0161589098000224journal_volume
35pub_type
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