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Molecular Cancer
Published in: Molecular Cancer 1/2014

Open Access 01-12-2014 | Research

ABCG2, a novel antigen to sort luminal progenitors of BRCA1- breast cancer cells

Authors: Felicia Leccia, Luigi Del Vecchio, Elisabetta Mariotti, Rosa Di Noto, Anne-Pierre Morel, Alain Puisieux, Francesco Salvatore, Stéphane Ansieau

Published in: Molecular Cancer | Issue 1/2014

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Abstract

Introduction

Tumor-initiating cells (TICs), aka “cancer stem cells”, are believed to fuel tumors and to sustain therapy resistance and systemic metastasis. Breast cancer is the first human carcinoma in which a subpopulation of cells displaying a specific CD44+/CD24-/low/ESA+ antigenic phenotype was found to have TIC properties. However, CD44+/CD24-/low/ESA+ is not a universal marker phenotype of TICs in all breast cancer subtypes. The aim of this study was to identify novel antigens with which to isolate the TIC population of the basal-A/basal-like breast cancer cell lines.

Methods

We used polychromatic flow-cytometry to characterize the cell surface of several breast cancer cell lines that may represent different tumor molecular subtypes. We next used fluorescence-activated cell sorting to isolate the cell subpopulations of interest from the cell lines. Finally, we explored the stem-like and tumorigenic properties of the sorted cell subpopulations using complementary in vitro and in vivo approaches: mammosphere formation assays, soft-agar colony assays, and tumorigenic assays in NOD/SCID mice.

Results

The CD44+/CD24+ subpopulation of the BRCA1-mutated basal-A/basal-like cell line HCC1937 is enriched in several stemness markers, including the ABCG2 transporter (i.e., the CD338 antigen). Consistently, CD338-expressing cells were also enriched in CD24 expression, suggesting that coexpression of these two antigenic markers may segregate TICs in this cell line. In support of ABCG2 expression in TICs, culturing of HCC1937 cells in ultra-low adherent conditions to enrich them in precursor/stem-cells resulted in an increase in CD338-expressing cells. Furthermore, CD338-expressing cells, unlike their CD338-negative counterparts, displayed stemness and transformation potential, as assessed in mammosphere and colony formation assays. Lastly, CD338-expressing cells cultured in ultra-low adherent conditions maintained the expression of CD326/EpCAM and CD49f/α6-integrin, which is a combination of antigens previously assigned to luminal progenitors.

Conclusion

Collectively, our data suggest that CD338 expression is specific to the tumor-initiating luminal progenitor subpopulation of BRCA1-mutated cells and is a novel antigen with which to sort this subpopulation.
Appendix
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Metadata
Title
ABCG2, a novel antigen to sort luminal progenitors of BRCA1- breast cancer cells
Authors
Felicia Leccia
Luigi Del Vecchio
Elisabetta Mariotti
Rosa Di Noto
Anne-Pierre Morel
Alain Puisieux
Francesco Salvatore
Stéphane Ansieau
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2014
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-13-213

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