{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T01:48:54Z","timestamp":1791251334901,"version":"4.1.0"},"reference-count":67,"publisher":"Bioscientifica","issue":"3","content-domain":{"domain":["joe.bioscientifica.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2018,6]]},"abstract":"<jats:p>Estrogen induces proliferation of breast epithelial cells and is responsible for breast development at puberty. This tightly regulated control is lost in estrogen-receptor-positive (ER+) breast cancers, which comprise over 70% of all breast cancers. Currently, breast cancer diagnosis and treatment considers only the \u03b1 isoform of ER; however, there is a second ER, ER\u03b2. Whilst ER\u03b1 mediates estrogen-driven proliferation of the normal breast in puberty and breast cancers, ER\u03b2 has been shown to exert an anti-proliferative effect on the normal breast. It is not known how the expression of each ER (alone or in combination) correlates with the ability of estrogen to induce proliferation in the breast. We assessed the levels of each ER in normal mouse mammary glands subdivided into proliferative and non-proliferative regions. ER\u03b1 was most abundant in the proliferative regions of younger mice, with ER\u03b2 expressed most abundantly in old mice. We correlated this expression profile with function by showing that the ability of estrogen to induce proliferation was reduced in older mice. To show that the ER profile associated with breast cancer risk, we assessed ER expression in parous mice which are known to have a reduced risk of developing ER\u03b1 breast cancer. ER\u03b1 expression was significantly decreased yet co-localization analysis revealed ER\u03b2 expression increased with parity. Parous mice had less unopposed nuclear ER\u03b1 expression and increased levels of ER\u03b2. These changes suggest that the nuclear expression of ERs dictates the proliferative nature of the breast and may explain the decreased breast cancer risk with parity.<\/jats:p>","DOI":"10.1530\/joe-17-0582","type":"journal-article","created":{"date-parts":[[2018,4,10]],"date-time":"2018-04-10T07:35:24Z","timestamp":1523345724000},"page":"323-336","update-policy":"https:\/\/doi.org\/10.1530\/crossmarkpolicy-5","source":"Crossref","is-referenced-by-count":44,"title":["Estrogen receptor subtypes dictate the proliferative nature of the mammary gland"],"prefix":"10.1530","volume":"237","author":[{"given":"Genevieve V","family":"Dall","sequence":"first","affiliation":[{"name":"1Peter MacCallum Cancer Centre, Melbourne, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel","family":"Hawthorne","sequence":"additional","affiliation":[{"name":"2Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yashar","family":"Seyed-Razavi","sequence":"additional","affiliation":[{"name":"2Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jessica","family":"Vieusseux","sequence":"additional","affiliation":[{"name":"1Peter MacCallum Cancer Centre, Melbourne, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wanfu","family":"Wu","sequence":"additional","affiliation":[{"name":"3Department of Biology and Biochemistry, University of Houston, Houston, Texas, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan-Ake","family":"Gustafsson","sequence":"additional","affiliation":[{"name":"3Department of Biology and Biochemistry, University of Houston, Houston, Texas, 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