Estrogen effects in the myocardium: inhibition of NF-kappaB DNA binding by estrogen receptor-alpha and -beta.

Abstract:

: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.

authors

Pelzer T,Neumann M,de Jager T,Jazbutyte V,Neyses L

doi

10.1006/bbrc.2001.5519

subject

Has Abstract

pub_date

2001-09-07 00:00:00

pages

1153-7

issue

5

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(01)95519-6

journal_volume

286

pub_type

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