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Glucocorticoid-Mediated Suppression of Cytokine-Induced Matrix Metalloproteinase-9 Expression in Rat Mesangial Cells: Involvement of Nuclear Factor-B and Ets Transcription Factors

Pharmazentrum Frankfurt, Klinikum der Johann Wolfgang Goethe-Universität, D-60590 Frankfurt am Main, Germany

Address all correspondence and requests for reprints to: Wolfgang Eberhardt, Ph.D., pharmazentrum frankfurt, Klinikum der Johann Wolfgang Goethe-Universität, TheodorStern-Kai 7, D-60590 Frankfurt am Main, Germany. E-mail: w.eberhardt{at}em.uni-frankfurt.de.

Glucocorticoids and their synthetic analogs exert potent antiinflammatory actions that, in most cases, are due to an inhibition of the expression of inflammatory genes. In this study, we elucidated the mechanisms of dexamethasone-mediated suppression of matrix metalloproteinase-9 (MMP-9) expression triggered by IL-1ß in rat mesangial cells. Treatment of mesangial cells with dexamethasone markedly reduced the gelatinolytic content of conditioned media due to a decrease in MMP-9 expression. Cloning of a 1.3-kb fragment of the rat MMP-9 gene promoter and subsequent site- directed mutagenesis revealed that a nuclear factor B (NF-B) site at -561 to -550 and a region from -511 to -497 bearing a distal activator protein 1 site adjacent to an Ets-binding site are essentially involved in the IL-1ß-mediated transactivation of MMP-9. Inhibition of MMP-9 expression by dexamethasone resides in a promoter region downstream of -597. The IL-1ß-caused increase in DNA binding of both NF-B and Ets-1 immunopositive complexes was substantially suppressed by dexamethasone as shown by EMSA. This was paralleled with a reduced abundance of p65 and Ets-1 proteins in cell nuclei concomitantly with a reduced inhibitor of B (IB) degradation. In addition to NF-B, we suggest a pivotal role for the Ets binding site, in concert with a distal activator protein-1 element, in the transcriptional suppression of cytokine-induced MMP-9 expression by glucocorticoids.

NURSA Molecule Pages Link:

Nuclear Receptors:   GR

Ligands:   Dexamethasone  |  RU486

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