title: Deregulated estrogen receptor alpha expression in mammary epithelial cells of transgenic mice results in the development of ductal carcinoma in situ.
abstract: A conditional tetracycline-responsive transgenic mouse model with deregulated estrogen receptor alpha expression in mammary epithelial cells developed ductal hyperplasia (DH), lobular hyperplasia, and ductal carcinoma in situ (DCIS) by 4 months of age. Higher proliferative rates were found in both normal and abnormal ductal and lobular structures. DH and DCIS but not normal ductal structures showed an increased percentage of cells with nuclear-localized cyclin D1. No differences in either the prevalence or extent of these phenotypes following exogenous 17beta-estradiol treatment were found suggesting that alteration of ERalpha expression was the rate-limiting factor in initiation of DH, lobular hyperplasia, and DCIS.
authors.affiliation: Lombardi Comprehensive Cancer Center, Departments of Oncology and Pathology, Georgetown University, 3970 Reservoir Road, Washington, DC 20057, USA.
authors.forename: M Silvina
authors.initials: MS
authors.lastname: Frech
authors.forename: Ewa D
authors.initials: ED
authors.lastname: Halama
authors.forename: Maddalena T
authors.initials: MT
authors.lastname: Tilli
authors.forename: Baljit
authors.initials: B
authors.lastname: Singh
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Gunther
authors.forename: Lewis A
authors.initials: LA
authors.lastname: Chodosh
authors.forename: Jodi A
authors.initials: JA
authors.lastname: Flaws
authors.forename: Priscilla A
authors.initials: PA
authors.lastname: Furth
mesh_terms: D000818:Animals; D002278:Carcinoma in Situ / Q000235:genetics / Q000378:metabolism*; D044584:Carcinoma, Ductal / Q000235:genetics / Q000378:metabolism*; D002467:Cell Nucleus / Q000378:metabolism; D049109:Cell Proliferation; D002471:Cell Transformation, Neoplastic / Q000235:genetics / Q000378:metabolism; D019938:Cyclin D1 / Q000378:metabolism; D004958:Estradiol / Q000494:pharmacology; D047628:Estrogen Receptor alpha / Q000096:biosynthesis* / Q000235:genetics; D005260:Female; D005786:Gene Expression Regulation; D015972:Gene Expression Regulation, Neoplastic; D006965:Hyperplasia; D008321:Mammary Glands, Animal / Q000378:metabolism / Q000473:pathology; D008325:Mammary Neoplasms, Experimental / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics
chemical_list: D047628:Estrogen Receptor alpha; D012333:RNA, Messenger; D019938:Cyclin D1; D004958:Estradiol