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Repression of estrogen receptor beta function by putative tumor suppressor DBC1.

Abstract：

:It has been well established that estrogen is involved in the pathophysiology of breast cancer. Estrogen receptor (ER) alpha appears to promote the proliferation of cancer tissues, while ERbeta can protect against the mitogenic effect of estrogen in breast tissue. The expression status of ERalpha and ERbeta may greatly influence on the development, treatment, and prognosis of breast cancer. Previous studies have indicated that the deleted in breast cancer 1 (DBC1/KIAA1967) gene product has roles in regulating functions of nuclear receptors. The gene encoding DBC1 is a candidate for tumor suppressor identified by genetic search for breast cancer. Caspase-dependent processing of DBC1 promotes apoptosis, and depletion of the endogenous DBC1 negatively regulates p53-dependent apoptosis through its specific inhibition of SIRT1. In addition, DBC1 modulates ERalpha expression and promotes breast cancer cell survival by binding to ERalpha. Here we report an ERbeta-specific repressive function of DBC1. Immunoprecipitation and immunofluorescence studies show that ERbeta and DBC1 interact in a ligand-independent manner similar to ERalpha. In vitro pull-down assays revealed a direct interaction between DBC1 amino-terminus and activation function-1/2 domain of ERbeta. Although DBC1 shows no influence on the ligand-dependent transcriptional activation function of ERalpha, the expression of DBC1 negatively regulates the ligand-dependent transcriptional activation function of ERbetain vivo, and RNA interference-mediated depletion of DBC1 stimulates the transactivation function of ERbeta. These results implicate the principal role of DBC1 in regulating ERbeta-dependent gene expressions.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Koyama S,Wada-Hiraike O,Nakagawa S,Tanikawa M,Hiraike H,Miyamoto Y,Sone K,Oda K,Fukuhara H,Nakagawa K,Kato S,Yano T,Taketani Y

doi

10.1016/j.bbrc.2010.01.025

subject

Has Abstract

pub_date

2010-02-12 00:00:00

pages

357-62

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(10)00055-0

journal_volume

392

pub_type

杂志文章

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