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Breast Cancer Research

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Open Access 01-06-2007 | Research article

An oestrogen-dependent model of breast cancer created by transformation of normal human mammary epithelial cells

Authors: Stephan Duss, Sylvie André, Anne-Laure Nicoulaz, Maryse Fiche, Hervé Bonnefoi, Cathrin Brisken, Richard D Iggo

Published in: Breast Cancer Research | Issue 3/2007

Abstract

Introduction

About 70% of breast cancers express oestrogen receptor α (ESR1/ERα) and are oestrogen-dependent for growth. In contrast with the highly proliferative nature of ERα-positive tumour cells, ERα-positive cells in normal breast tissue rarely proliferate. Because ERα expression is rapidly lost when normal human mammary epithelial cells (HMECs) are grown in vitro, breast cancer models derived from HMECs are ERα-negative. Currently only tumour cell lines are available to model ERα-positive disease. To create an ERα-positive breast cancer model, we have forced normal HMECs derived from reduction mammoplasty tissue to express ERα in combination with other relevant breast cancer genes.

Methods

Candidate genes were selected based on breast cancer microarray data and cloned into lentiviral vectors. Primary HMECs prepared from reduction mammoplasty tissue were infected with lentiviral particles. Infected HMECs were characterised by Western blotting, immunofluorescence microscopy, microarray analysis, growth curves, karyotyping and SNP chip analysis. The tumorigenicity of the modified HMECs was tested after orthotopic injection into the inguinal mammary glands of NOD/SCID mice. Cells were marked with a fluorescent protein to allow visualisation in the fat pad. The growth of the graft was analysed by fluorescence microscopy of the mammary glands and pathological analysis of stained tissue sections. Oestrogen dependence of tumour growth was assessed by treatment with the oestrogen antagonist fulvestrant.

Results

Microarray analysis of ERα-positive tumours reveals that they commonly overexpress the Polycomb-group gene BMI1. Lentiviral transduction with ERα, BMI1, TERT and MYC allows primary HMECs to be expanded in vitro in an oestrogen-dependent manner. Orthotopic xenografting of these cells into the mammary glands of NOD/SCID mice results in the formation of ERα-positive tumours that metastasise to multiple organs. The cells remain wild type for TP53, diploid and genetically stable. In vivo tumour growth and in vitro proliferation of cells explanted from tumours are dependent on oestrogen.

Conclusion

We have created a genetically defined model of ERα-positive human breast cancer based on normal HMECs that has the potential to model human oestrogen-dependent breast cancer in a mouse and enables the study of mechanisms involved in tumorigenesis and metastasis.

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Title: An oestrogen-dependent model of breast cancer created by transformation of normal human mammary epithelial cells
Authors: Stephan Duss
Sylvie André
Anne-Laure Nicoulaz
Maryse Fiche
Hervé Bonnefoi
Cathrin Brisken
Richard D Iggo
Publication date: 01-06-2007
Publisher: BioMed Central
Published in: Breast Cancer Research / Issue 3/2007
Electronic ISSN: 1465-542X
DOI: https://doi.org/10.1186/bcr1734

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