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Transcriptional Activity and Is a Key Regulator of the Cellular Response to Estrogens and Antiestrogens1
Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710
Address all correspondence and requests for reprints to: Dr. Donald P. McDonnell, Department of Pharmacology and Cancer Biology, Duke University Medical Center, P.O. Box 3813, Durham, North Carolina 27710. E-mail: mcdon016{at}acpub.duke.edu
The human estrogen receptor
(ER
) and the recently identified
ERß share a high degree of amino acid homology; however, there are
significant differences in regions of these receptors that would be
expected to influence transcriptional activity. Consequently, we
compared the mechanism(s) by which these receptors regulate target gene
transcription, and evaluated the cellular consequences of coexpression
of both ER subtypes. Previously, it has been determined that ER
contains two distinct activation domains, ER
-AF-1 and ER
-AF-2,
whose transcriptional activity is influenced by cell and promoter
context. We determined that ERß, like ER
, contains a functional
AF-2, however, the ERß-AF-2 domain functions independently within the
receptor. Of additional significance was the finding that ERß does
not contain a strong AF-1 within its amino-terminus but, rather,
contains a repressor domain that when removed, increases the overall
transcriptional activity of the receptor. The importance of these
findings was revealed when it was determined that ERß functions as a
transdominant inhibitor of ER
transcriptional activity at
subsaturating hormone levels and that ERß decreases overall cellular
sensitivity to estradiol. Additionally, the partial agonist activity of
tamoxifen manifest through ER
in some contexts was completely
abolished upon coexpression of ERß. In probing the mechanisms
underlying ERß-mediated repression of ER
transcriptional activity
we have determined that 1) ER
and ERß can form heterodimers within
target cells; and 2) ERß interacts with target gene promoters in a
ligand-independent manner. Cumulatively, these data indicate that one
role of ERß is to modulate ER
transcriptional activity, and thus
the relative expression level of the two isoforms will be a key
determinant of cellular responses to agonists and antagonists.
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