TFII-I down-regulates a subset of estrogen-responsive genes through its interaction with an initiator element and estrogen receptor α

Yuji Ogura, Motoki Azuma, Yasunori Tsuboi, Yasuaki Kabe, Yuki Yamaguchi, Tadashi Wada, Hajime Watanabe, Hiroshi Handa

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

TFII-I was initially identified as the general transcription factor that binds to initiator (Inr) elements in vitro. Subsequent studies have shown that TFII-I activates transcription of various genes either through Inr elements or through other upstream elements in vivo. Since, however, most studies so far on TFII-I have been limited to over-expression and reporter gene assays, we reevaluated the role of TFII-I in vivo by using stable knockdown with siRNA and by examining the expression of endogenous genes. Contrary to the widely accepted view, here we show that TFII-I is not important for cell viability in general but rather inhibits the growth of MCF-7 human breast cancer cells. MCF-7 cells are known to proliferate in an estrogen-dependent manner. Through analysis of TFII-I's cell-type specific growth inhibitory effect, we show evidence that TFII-I down-regulates a subset of estrogen-responsive genes, only those containing Inr elements, by recruiting estrogen receptor (ER) α and corepressors to these promoters. Thus, this study has revealed an unexpected new role of TFII-I as a negative regulator of transcription and cell proliferation.

Original languageEnglish
Pages (from-to)373-381
Number of pages9
JournalGenes to Cells
Volume11
Issue number4
DOIs
Publication statusPublished - 2006 Apr 1
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Cell Biology

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