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Vol. 295, Issue 2, 431-437, November 2000
Department of Molecular and Cellular Biology, Baylor College of
Medicine, Houston, Texas
In females, estrogens play a key role in reproduction and have
beneficial effects on the skeletal, cardiovascular, and central nervous
systems. Most estrogenic responses are mediated by estrogen receptors
(ERs), either ER
or ER
, which are members of the nuclear receptor
superfamily of ligand-dependent transcription factors. Selective
estrogen receptor modulators (SERMs) are ER ligands that in some
tissues act like estrogens, but block estrogen action in others. Thus,
SERMs may exhibit an agonistic or antagonistic biocharacter depending
on the context in which their activity is examined. For example, the
SERMs tamoxifen and raloxifene both exhibit ER antagonist activity in
breast and agonist activity in bone, but only tamoxifen manifests
agonist activity in the uterus. Numerous studies have examined the
molecular basis for SERM selectivity. Collectively they indicate that
different ER ligands induce distinct structural changes in the receptor
that influence its ability to interact with other proteins (e.g.,
coactivators or corepressors) critical for the regulation of target
gene transcription. The relative expression of coactivators and
corepressors, and the nature of the ER and of its target gene promoter
affect SERM biocharacter. Taken together, SERM selectivity reflects the
diversity of ER forms and coregulators, cell type differences in their
expression, and the diversity of ER target genes. This model provides a
basis for understanding the molecular mechanisms of SERM action, and should help identify new SERMs with enhanced tissue or target gene selectivity.
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