Suppression of estrogen receptor-mediated transcription and cell growth by interaction with TR2 orphan receptor

Yueh Chiang Hu, Chih Rong Shyr, Wenyi Che, Xiao Min Mu, Eungseok Kim, Chawnshang Chang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

35 Scopus citations

Abstract

The transcriptional activity of the estrogen receptor (ER) is known to be highly modulated by the character and amount of coregulator proteins present in the cells. TR2 orphan receptor (TR2), a member of the nuclear receptor superfamily without identified ligands, is found to be expressed in the breast cancer cell lines and to function as a repressor to suppress ER-mediated transcriptional activity. Utilizing an interaction blocker, ER-6 (amino acids 312-340), responsible for TR2 interaction, the suppression of ER by TR2 could be reversed, suggesting that this suppression is conferred by the direct protein-protein interaction. Administration of antisense TR2, resulting in an enhancement of ER transcriptional activity in MCF7 cells, indicates that endogenous TR2 normally suppresses ER-mediated signaling. To gain insights into the molecular mechanism by which TR2 suppresses ER, we found that TR2 could interrupt ER DNA binding via formation of an ER-TR2 heterodimer that disrupted the ER homodimerization. The suppression of ER transcription by TR2 consequently caused the inhibition of estrogen-induced cell growth and G 1/S transition in estrogen-dependent breast cancer cells. Taken together in addition to the potential roles in spermatogenesis and neurogenesis, our data provide a novel biological function of TR2 that may exert an important repressor in regulating ER activity in mammary glands.

Original languageEnglish
Pages (from-to)33571-33579
Number of pages9
JournalJournal of Biological Chemistry
Volume277
Issue number37
DOIs
StatePublished - 13 09 2002
Externally publishedYes

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