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Vol. 56, Issue 4, 797-806, October 1999
B-Dependent Mechanism
Department of Molecular Biology (W.V.B., K.D.B., G.H.)
University of Gent and Flanders Interuniversity Institute for
Biotechnology, Gent, Belgium; and Hoechst Marion Roussel (E.F.,
M.R.-R.), Molecular and Cellular Biology, Bone Disease Group,
Romainville Cedex, France
Synthetic glucocorticoids (GCs) remain among the most effective agents
for the management of chronic inflammatory diseases. However, major
side effects severely limit their therapeutic use. Physiologic and
therapeutic activities of GCs are mediated by a nuclear receptor
belonging to a superfamily of ligand-inducible transcription factors
that, in addition to directly regulating their cognate gene programs,
can also mutually interfere with other signaling pathways. We recently
identified selective ligands of the glucocorticoid receptor that
dissociate transactivation from activator protein 1 transrepression, and most importantly retain in vivo anti-inflammatory
activity. To further document the mechanisms of action sustaining the
observed in vivo activity, we report here on the interference of
dissociated GCs with nuclear factor
B (NF-
B)-driven gene
activation. We show that dissociated GCs repress tumor necrosis
factor-induced interleukin-6 gene expression by an
NF-
B-dependent mechanism, without changing the expression level of
inhibitor
B. The DNA-binding activity of induced NF-
B also
remained unchanged after stimulation of cells with the various compounds. Evidence for a direct nuclear mechanism of action was obtained by analysis of cell lines constitutively expressing a fusion
protein between the DNA-binding domain of the yeast Gal4 protein and
the transactivating p65 subunit of NF-
B, which was able to
efficiently repress a Gal4-dependent luciferase reporter gene upon
addition of the dissociated compounds. We therefore conclude that, in
addition to dissociating transactivation from activator protein 1 transrepression, dissociated GCs mediate inhibition of NF-
B
signaling by a mechanism that is independent of inhibitor
B induction.
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