Zhang Z, Jones S, Hagood JS, Fuentes NL, Fuller GM

Department of Cell Biology, Pulmonary Division, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA.

Interleukin-6 (IL-6) and glucocorticoids are important mediators of inflammatory and immunological responses. Glucocorticoids are known to synergistically enhance IL-6-mediated cellular responses. We now show that IL-6 also has a synergistic effect upon glucocorticoid signaling. In particular, IL-6-activated STAT3 associates with ligand-bound glucocorticoid receptor to form a transactivating/signaling complex, which can function through either an IL-6-responsive element or a glucocorticoid-responsive element. These findings reveal a new level of interaction between these two crucial signaling cascades and indicate that activated STAT3 can also act as a transcriptional co-activator without direct association with its DNA binding motif.

Mesh Terms:
Animals, COS Cells, DNA-Binding Proteins, Drug Synergism, Glucocorticoids, Interleukin-6, Ligands, Liver Neoplasms, Experimental, Rats, Receptors, Glucocorticoid, STAT3 Transcription Factor, Signal Transduction, Trans-Activators, Transfection, Tumor Cells, Cultured

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