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  • Original Paper
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Prolactin induces ERα-positive and ERα-negative mammary cancer in transgenic mice

Abstract

The role of prolactin in human breast cancer has been controversial. However, it is now apparent that human mammary epithelial cells can synthesize prolactin endogenously, permitting autocrine/paracrine actions within the mammary gland that are independent of pituitary prolactin. To model this local mammary production of prolactin (PRL), we have generated mice that overexpress prolactin within mammary epithelial cells under the control of a hormonally nonresponsive promoter, neu-related lipocalin (NRL). In each of the two examined NRL-PRL transgenic mouse lineages, female virgin mice display mammary developmental abnormalities, mammary intraepithelial neoplasias, and invasive neoplasms. Prolactin increases proliferation in morphologically normal alveoli and ducts, as well as in lesions. The tumors are of varied histotype, but papillary adenocarcinomas and adenosquamous neoplasms predominate. Neoplasms can be separated into two populations: one is estrogen receptor alpha (ERα) positive (greater than 15% of the cells stain for ERα), and the other is ERα− (<3%). ERα expression does not correlate with tumor histotype, or proliferative or apoptotic indices. These studies provide a mouse model of hormonally dependent breast cancer, and, perhaps most strikingly, a model in which some neoplasms retain ERα, as occurs in the human disease.

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Abbreviations

DCIS:

ductal carcinoma in situ

E2:

estradiol

ERα:

estrogen receptor alpha

PRL:

prolactin

MT:

metallothionein

MIN:

mammary intraepithelial neoplasia

NRL:

neu-related lipocalin

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Acknowledgements

We are grateful to Dr Jan Lohse for generation of transgenic mice, Kristin Wentworth and Sarah Nikolai for assistance with mouse colony management and data collection, Jennifer Gutzman for her assistance with the Nb2 cell assay, and Drs Michael Gould and Kai-Shun Chen for providing the NRL gene promoter. These studies were supported by National Institutes of Health Grants R01 CA78312 (to LAS), K01 RR00145 (to TAR-H), R01-CA64843 (to EPS), T32-AG00265 and the University of Wisconsin Center for Women's Health and Women's Health Research.

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Correspondence to Linda A Schuler.

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Rose-Hellekant, T., Arendt, L., Schroeder, M. et al. Prolactin induces ERα-positive and ERα-negative mammary cancer in transgenic mice. Oncogene 22, 4664–4674 (2003). https://doi.org/10.1038/sj.onc.1206619

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