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Drug Development Unit (G.B.T., D.B.), SignalGene Inc., Montréal, Québec, Canada H2M 2N9; Molecular Oncology Group (V.G.), Department of Medicine, McGill University Health Centre, Montréal, Québec, Canada H3A 1A1
Selective estrogen receptor modulators (SERMs) are synthetic molecules
that exhibit tissue-specific activities. 4-hydroxytamoxifen (OHT)
is a first generation SERM that functions as an antagonist in breast
cancer cells but displays estrogen-like activities in the uterus and
bone. The estrogen-receptor-related receptors (ERR)
, ß and
are orphan members of the superfamily of nuclear receptors. While the
ERRs do not respond to natural estrogens, these receptors recognize the
estrogen response element and have been shown to activate and repress
gene expression in the absence of exogenously added ligand. Here we
show that OHT disrupts the interaction between the orphan
estrogen-receptor-related (ERR) receptors ß and
and a coregulator
protein and abolishs the constitutive transcriptional activity of these
receptors in transient transfection assays. In contrast, OHT has no
effect on coregulator/ERR
interaction or its transcriptional
activity. These results demonstrate the existence of a novel nuclear
receptor-based pharmacological pathway that may contribute to the
tissue-specific activities of OHT.
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