Volume 96, Issue 10 pp. 645-652
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Orphan nuclear receptor DAX-1 in human endometrium and its disorders

Sumika Saito

Corresponding Author

Sumika Saito

Departments of Obstetrics and Gynecology, and

To whom correspondence should be addressed. E-mail: [email protected]Search for more papers by this author
Kiyoshi Ito

Kiyoshi Ito

Departments of Obstetrics and Gynecology, and

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Takashi Suzuki

Takashi Suzuki

Pathology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan

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Hiroki Utsunomiya

Hiroki Utsunomiya

Departments of Obstetrics and Gynecology, and

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Jun-ichi Akahira

Jun-ichi Akahira

Departments of Obstetrics and Gynecology, and

Pathology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan

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Youko Sugihashi

Youko Sugihashi

Departments of Obstetrics and Gynecology, and

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Hitoshi Niikura

Hitoshi Niikura

Departments of Obstetrics and Gynecology, and

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Kunihiro Okamura

Kunihiro Okamura

Departments of Obstetrics and Gynecology, and

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Nobuo Yaegashi

Nobuo Yaegashi

Departments of Obstetrics and Gynecology, and

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Hironobu Sasano

Hironobu Sasano

Pathology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan

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First published: 13 October 2005
Citations: 18

Abstract

DAX-1 (dosage-sensitive sex reversal adrenal hypoplasia congenita critical region on the X chromosome gene 1) is a recently characterized member of the orphan nuclear receptor family. DAX-1 functions as a global negative regulator of steroid hormone production. It inhibits adrenal 4 binding protein (Ad4BP)/steroidogenic factor-1 (SF-1) pathway-dependent P450arom expression in cultured human endometriotic stromal cells and acts as a corepressor for estrogen receptors (ER). In this study we first examined the localization of DAX-1 in 46 normal cycling endometria, 36 cases of endometrial hyperplasia and 103 cases of endometrial carcinoma by using immunohistochemistry to elucidate the possible involvement of DAX-1 and its correlation to the status of Ad4BP/SF-1, a universal transcription factor of steroidogenesis. We then evaluated DAX-1 mRNA expression, using quantitative reverse transcription–polymerase chain reaction for DAX-1 in 33 cases of endometrial carcinoma for further characterization. We subsequently correlated these findings with various clinicopathological parameters of the cases. Ad4BP/SF-1 immunoreactivity was not detected in any human endometria examined. A significant inverse correlation was detected between the status of DAX-1 immunoreactivity and histological grade (P = 0.0003) in endometrial carcinoma. The labeling index (LI) values of DAX-1 in normal endometrium during the secretory phase (P < 0.0001) and hyperplasia (P < 0.0001) were significantly higher than that of carcinoma. No significant correlations were detected between DAX-1 immunoreactivity and amounts of aromatase mRNA. There was a statistically significant positive correlation between DAX-1 and ERα (P = 0.006) and ERβ LI (P < 0.001). These findings suggest that DAX-1 may inhibit the proliferation and progression of endometrial carcinoma through inhibition of estrogenic actions, possibly by interacting with ER present in carcinoma cells, rather than regulating in situ steroidogenesis. (Cancer Sci 2005; 96: 645 – 652)

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