Involvement of estrogen receptor-related receptors in human ovarian endometriosis

Laboratory of Biochemistry, National Institute for Digestive Diseases, I.R.C.C.S. Saverio de Bellis, Castellana Grotte, Bari, Italy.
Fertility and sterility (Impact Factor: 4.59). 05/2011; 96(1):102-6. DOI: 10.1016/j.fertnstert.2011.04.032
Source: PubMed


To determine whether decreased estrogen receptor alpha (ER-α) expression in endometriotic lesions could be balanced by an increased expression of estrogen receptor-related receptors (ERRs). To evaluate whether ERR-α expression is influenced by hormonal change in fertile and menopausal women.
Prospective controlled study.
University Hospital, Department of Gynecology.
Twenty-five women: 20 women of reproductive age with (n = 10) and without (control; n = 10) endometriosis and 5 menopausal women.
Real-time polymerase chain reaction (qPCR). Immunohistochemistry.
The ER and ERR expression levels were studied by reverse transcriptase-qPCR, ELISA, and immunohistochemistry using endometriotic and normal endometrial tissues. The ERR-α protein distribution was performed by immunohistochemistry in fertile and menopausal women.
Increased levels of ER-β were associated with ER-α, ERR-α, and ERR-γ reductions in ectopic tissue but not in eutopic and normal endometria. Similar levels of ERR-β were found in women with and without endometriosis. The ERR-α expression was similar in proliferative and secretory endometrial samples, whereas a down-regulation of this receptor was found in atrophic tissue.
Our data confirm the up-regulation of ER-β as the principal receptor involved in the progression of human endometriosis. In addition, we found that ERR-α seems to be unresponsive to hormonal changes during the menstrual cycle.

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    • "Progesterone receptor PRA/B, PGR PR mRNA was unchanged (qRT-PCR) [26] PR mRNA decreased in the stroma (qRT-PCR) [23] [27] PR protein decreased in the glands (IHC) PR protein decreased in the glands (IHC) [32] PR protein decreased (IF, EIA, DCC) PR protein decreased (IF, EIA, DCC) [29] [30] PR protein decreased in the glands (ICC) [31] PR protein was present in both the glands and the stroma (IHC) [39] PR protein decreased (IHC) [23] PR protein decreased in the stroma, but increased in the glands during the secretory phase (IHC) [36] PR protein increased in the glands (IHC) [38] PR protein was unchanged (IHC) [35] PRA PRA protein decreased (WB, IP) [28] PRA protein was present in the stroma (IHC) [39] PRA protein decreased in both the glands and the stroma (IHC) [37] PRB PRB mRNA decreased in the stroma (qRT-PCR) [27] PRB protein was absent (WB, IP) [28] PRB protein was present in the stroma (IHC) [39] "
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