Various glucocorticoids differ in their ability to induce gene expression, apoptosis and to repress NF-κB-dependent transcription
Identifieur interne : 000C10 ( Main/Exploration ); précédent : 000C09; suivant : 000C11Various glucocorticoids differ in their ability to induce gene expression, apoptosis and to repress NF-κB-dependent transcription
Auteurs : Thomas G. Hofmann [Allemagne] ; Steffen P. Hehner [Allemagne] ; Susanne Bacher [Allemagne] ; Wulf Dröge [Allemagne] ; M. Lienhard Schmitz [Allemagne]Source :
- FEBS Letters [ 0014-5793 ] ; 1998.
Abstract
Glucocorticoids (GCs) influence a great variety of cellular functions by at least three important modes of action: the activation (or repression) of genes controlled by binding sites for the glucocorticoid receptor (GR), the induction of apoptosis in lymphocytes and the recently discovered cross-talk to other transcription factors such as NF-κB. In this study we systematically compared various natural and synthetic steroid hormones frequently used as therapeutic agents on their ability to mediate these three modes of action. Betamethasone, triamcinolone, dexamethasone and clobetasol turned out to be the best inducers of gene expression and apoptosis. All GCs including the antagonistic compound RU486 efficiently reduced NF-κB-mediated transactivation to comparable extents, suggesting that ligand-induced nuclear localization of the GR is sufficient for transrepression. Glucocorticoid treatment of cells did not result in elevated IκB-α expression, but impaired the tumor necrosis factor (TNF)-α-induced degradation of IκB-α without affecting DNA binding of NF-κB. The structural requirements for the various functions of glucocorticoids are discussed.
Url:
DOI: 10.1016/S0014-5793(98)01609-3
Affiliations:
- Allemagne
- Bade-Wurtemberg, District de Fribourg-en-Brisgau, District de Karlsruhe
- Fribourg-en-Brisgau, Heidelberg
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In this study we systematically compared various natural and synthetic steroid hormones frequently used as therapeutic agents on their ability to mediate these three modes of action. Betamethasone, triamcinolone, dexamethasone and clobetasol turned out to be the best inducers of gene expression and apoptosis. All GCs including the antagonistic compound RU486 efficiently reduced NF-κB-mediated transactivation to comparable extents, suggesting that ligand-induced nuclear localization of the GR is sufficient for transrepression. Glucocorticoid treatment of cells did not result in elevated IκB-α expression, but impaired the tumor necrosis factor (TNF)-α-induced degradation of IκB-α without affecting DNA binding of NF-κB. The structural requirements for the various functions of glucocorticoids are discussed.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Bade-Wurtemberg</li><li>District de Fribourg-en-Brisgau</li><li>District de Karlsruhe</li></region><settlement><li>Fribourg-en-Brisgau</li><li>Heidelberg</li></settlement></list><tree><country name="Allemagne"><region name="Bade-Wurtemberg"><name sortKey="Hofmann, Thomas G" sort="Hofmann, Thomas G" uniqKey="Hofmann T" first="Thomas G" last="Hofmann">Thomas G. Hofmann</name></region><name sortKey="Bacher, Susanne" sort="Bacher, Susanne" uniqKey="Bacher S" first="Susanne" last="Bacher">Susanne Bacher</name><name sortKey="Droge, Wulf" sort="Droge, Wulf" uniqKey="Droge W" first="Wulf" last="Dröge">Wulf Dröge</name><name sortKey="Hehner, Steffen P" sort="Hehner, Steffen P" uniqKey="Hehner S" first="Steffen P" last="Hehner">Steffen P. 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