Introduction of Estrogen Receptor-α into the tTA/TAg Conditional Mouse Model Precipitates the Development of Estrogen-Responsive Mammary Adenocarcinoma

Maddalena T. Tilli, M. Silvina Frech, Mary E. Steed, Kathleen S. Hruska, Michael D. Johnson, Jodi A. Flaws, Priscilla A. Furth

Research output: Contribution to journalArticlepeer-review

Abstract

Conditional expression of estrogen receptor (ER)-α) was introduced into tetracycline-responsive MMTV-tTA/tetop-TAg mice to develop a mouse model of estrogen-responsive ER-α-positive mammary adenocarcinoma. Mammary adenocarcinomas developed in the mice with a mean latency of 11 months. Precursor lesions including ductal hyperplasia and hyperplastic alveolar nodules were present by the age of 4 months. The mammary adenocarcinomas exhibited histological features similar to human breast cancers. ER steroid-binding studies conducted on adenocarcinoma lysates demonstrated binding to estradiol. Tumor explant studies in the presence and absence of estradiol in ovariectomized athymic nude mice revealed that growth of mammary tumors was stimulated by estrogen. In addition, the presence of ER-α altered the tumor spectrum in other MMTV-targeted tissues in the tTA/TAg female mice. Lymphomas, which develop in 40% of tTA/TAg female mice, were found in only 4% of tTA/TAg/ER-α mice (P = 0.014, chi-square test). These experiments demonstrate that the introduction of an ER-α transgene targeted to mammary epithelial cells can be used to develop mouse models of ER-α-responsive mammary cancer.

Original languageEnglish (US)
Pages (from-to)1713-1719
Number of pages7
JournalAmerican Journal of Pathology
Volume163
Issue number5
DOIs
StatePublished - Nov 2003

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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