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Department of Adult Oncology Dana-Farber Cancer Institute Boston, Massachusetts 02115
A new level of complexity has recently been added
to estrogen signaling with the identification of a second estrogen
receptor, ERß. By screening a rat prostate cDNA library, we detected
ERß as well as a novel isoform that we termed ERß2. ERß2 contains
an in-frame inserted exon of 54 nucleotides that results in the
predicted insertion of 18 amino acids within the ERß hormone-binding
domain. We also have evidence for the expression of both ERß1 and
ERß2 in human cell lines. Competition ligand binding analysis of
bacterially expressed fusion proteins revealed an 8-fold lower affinity
of ERß2 for 17ß-estradiol (E2)
[dissociation constant (Kd
8
nM)] as compared with ERß1
(Kd
1 nM). In
vitro transcribed and translated ERß1 and ERß2 bind
specifically to a consensus estrogen responsive element in a gel
mobility shift assay. Furthermore, we show heterodimerization of ERß1
and ERß2 with each other as well as with ER
. In affinity
interaction assays for proteins that associate specifically with the
hormone-binding domain of these receptors, we demonstrate that the
steroid receptor coactivator SRC-1 interacts in an estrogen-dependent
manner with ER
and ERß1, but not with ERß2. In cotransfection
experiments with expression plasmids for ER
, ERß1, and ERß2 and
an estrogen-responsive element-containing luciferase reporter, the dose
response of ERß1 to E2 was similar to that of
ER
although the maximal stimulation was approximately 50%. In
contrast, ERß2 required 100- to 1000-fold greater
E2 concentrations for maximal activation. Thus,
ERß2 adds yet another facet to the possible cellular responses to
estrogen.
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