Abstract：
:Estrogen-related receptor alpha (ERRalpha) was identified as a gene related to estrogen receptor alpha (ERalpha) and belongs to a class of nuclear orphan receptors. ERRalpha binds to estrogen responsive element(s) (ERE) and is considered to be involved in modulation of estrogenic actions. However, biological significance of ERRalpha remains largely unknown. Therefore, we examined the expression of ERRalpha in human breast carcinoma tissues using immunohistochemistry (n = 102) and real-time reverse transcription-PCR (n = 30). ERRalpha immunoreactivity was detected in the nuclei of carcinoma cells in 55% of breast cancers examined, and relative immunoreactivity of ERRalpha was significantly (P = 0.0041) associated with the mRNA level. Significant associations were detected between ERalpha and ERE-containing estrogen-responsive genes, such as pS2 (P < 0.0001) and EBAG9/RCAS1 (P = 0.0214), in breast carcinoma tissues. However, no significant association was detected between ERalpha and pS2 (P = 0.1415) in the ERRalpha-positive cases (n = 56) or between ERalpha and EBAG9/RCAS1 (P = 0.8271) in the ERRalpha-negative group (n = 46). ERRalpha immunoreactivity was significantly associated with an increased risk of recurrence and adverse clinical outcome by both uni- (P = 0.0097 and P = 0.0053, respectively) and multi- (P = 0.0215 and P = 0.0118, respectively) variate analyses. A similar tendency was also detected in the group of breast cancer patients who received tamoxifen therapy after surgery. Results from our study suggest that ERRalpha possibly modulates the expression of ERE-containing estrogen-responsive genes, and ERRalpha immunoreactivity is a potent prognostic factor in human breast carcinoma.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Suzuki T,Miki Y,Moriya T,Shimada N,Ishida T,Hirakawa H,Ohuchi N,Sasano Hdoi
10.1158/0008-5472.CAN-04-0250subject
Has Abstractpub_date
2004-07-01 00:00:00pages
4670-6issue
13eissn
0008-5472issn
1538-7445pii
64/13/4670journal_volume
64pub_type
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