Reference : Estrogen effects in the myocardium: inhibition of NF-kappaB DNA binding by estrogen r...
Scientific journals : Article
Human health sciences : Cardiovascular & respiratory systems
Estrogen effects in the myocardium: inhibition of NF-kappaB DNA binding by estrogen receptor-alpha and -beta.
Pelzer, T. [> >]
Neumann, M. [> >]
de Jager, T. [> >]
Jazbutyte, V. [> >]
Neyses, Ludwig mailto [University of Luxembourg > Research Office]
Biochemical and biophysical research communications
United States
[en] Animals ; Cell Nucleus/metabolism ; Cells, Cultured ; Cytosol/metabolism ; DNA/metabolism ; DNA-Binding Proteins/metabolism ; Dimerization ; Enzyme Activation ; Estradiol/pharmacology ; Estrogen Receptor alpha ; Estrogen Receptor beta ; Estrogens/pharmacology ; I-kappa B Proteins/metabolism ; Immunoblotting ; Myocardium/metabolism ; NF-kappa B/antagonists & inhibitors/metabolism ; NF-kappa B p50 Subunit ; Protein Binding ; Rats ; Rats, Wistar ; Receptors, Estrogen/metabolism ; Recombinant Proteins/metabolism ; Staurosporine/pharmacology ; Transcription Factor RelA
[en] We have previously shown that estrogen effects in the heart include direct hormone effects on the myocardium. In a recent study we found that one beneficial effect of estradiol on the myocardium is the inhibition of apoptosis in cardiac myocytes. This effect was associated with a reduction of NF-kappaB activity. In the present study we have analyzed the functional mechanism of NF-kappaB inhibition in the myocardium by estrogen receptors-alpha and -beta. Despite the previous finding that 17-beta-estradiol (10 nM) inhibited the staurosporine-induced binding of p65/p50 NF-kappaB complexes to their cognate DNA elements in cultured rat cardiac myocytes, myocyte extracts showed no change in expression or cellular localization of p65, p50, and IkappaB upon staurosporine or estradiol treatment. Addition of either estrogen receptor-alpha or estrogen receptor-beta as recombinant protein was sufficient to inhibit staurosporine-dependent p65/p50 DNA binding in cardiac myocytes. 17-beta-Estradiol inhibits staurosporine-induced p65/p50 DNA binding associated with apoptotic cell death of cardiac myocytes via estrogen receptors-alpha and -beta. This is not associated with changes in p65, p50 and IkappaB expression or subcellular localization. Thus, inhibition of NF-kappaB activity by estrogenic compounds might inhibit NF-kappaB dependent gene expression such as pro-inflammatory cytokines in the myocardium.
Copyright 2001 Academic Press.

File(s) associated to this reference

Fulltext file(s):

Limited access
Estrogen Effects in the Myocardium - Inhibition of NF-kB.pdfPublisher postprint98.58 kBRequest a copy

Bookmark and Share SFX Query

All documents in ORBilu are protected by a user license.