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Biola, Armelle; Andréau, Karine; David, Muriel; Sturm, Marie; Haake, Markus; Bertoglio, Jacques; Pallardy, Marc
FEBS letters, December 29, 2000, Volume: 487, Issue: 2Journal Article
In lymphocytes, glucocorticoids (GC)- and interleukin-4-signaling pathways are known to interact, as evidenced by inhibition of IL-4-mediated proliferation by dexamethasone or suppression of GC-induced apoptosis by IL-4. In this study, we characterized the molecular basis for this reciprocal interference. We report that, in murine CTLL-2 cells, IL-4 inhibits GC-induced MMTV (mouse mammary tumor virus) promoter transactivation, and that GC suppress IL-4-induced transactivation of a STAT6 (signal transducers and activators of transcription 6)-responsive promoter without affecting IL-4-stimulated STAT6 DNA-binding. Moreover, we evidenced a physical association between GC receptor and STAT6, which proved to be functionally relevant, since STAT6 overexpression increased the IL-4 inhibitory effect on GC-induced MMTV transactivation.
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