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Published in: Breast Cancer Research 1/2016

Open Access 01-12-2016 | Research article

Low expression of galectin-3 is associated with poor survival in node-positive breast cancers and mesenchymal phenotype in breast cancer stem cells

Authors: Matthias Ilmer, Nachman Mazurek, Michael Z. Gilcrease, James C. Byrd, Wendy A. Woodward, Thomas A. Buchholz, Kim Acklin, Karen Ramirez, Margarete Hafley, Eckhard Alt, Jody Vykoukal, Robert S. Bresalier

Published in: Breast Cancer Research | Issue 1/2016

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Abstract

Background

Galectin-3 (Gal3) plays diverse roles in cancer initiation, progression, and drug resistance depending on tumor type characteristics that are also associated with cancer stem cells (CSCs). Recurrence of breast carcinomas may be attributed to the presence of breast CSCs (BCSCs). BCSCs exist in mesenchymal-like or epithelial-like states and the transition between these states endows BCSCs with the capacity for tumor progression. The discovery of a feedback loop with galectins during epithelial-to-mesenchymal transition (EMT) prompted us to investigate its role in breast cancer stemness.

Method

To elucidate the role of Gal3 in BCSCs, we performed various in vitro and in vivo studies such as sphere-formation assays, Western blotting, flow cytometric apoptosis assays, and limited dilution xenotransplant models. Histological staining for Gal3 in tissue microarrays of breast cancer patients was performed to analyze the relationship of clinical outcome and Gal3 expression.

Results

Here, we show in a cohort of 87 node-positive breast cancer patients treated with doxorubicin-based chemotherapy that low Gal3 was associated with increased lymphovascular invasion and reduced overall survival. Analysis of in vitro BCSC models demonstrated that Gal3 knockdown by small hairpin RNA (shRNA) interference in epithelial-like mammary spheres leads to EMT, increased sphere-formation ability, drug-resistance, and heightened aldefluor activity. Furthermore, Gal3negative BCSCs were associated with enhanced tumorigenicity in orthotopic mouse models.

Conclusions

Thus, in at least some breast cancers, loss of Gal3 might be associated with EMT and cancer stemness-associated traits, predicts poor response to chemotherapy, and poor prognosis.
Appendix
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Metadata
Title
Low expression of galectin-3 is associated with poor survival in node-positive breast cancers and mesenchymal phenotype in breast cancer stem cells
Authors
Matthias Ilmer
Nachman Mazurek
Michael Z. Gilcrease
James C. Byrd
Wendy A. Woodward
Thomas A. Buchholz
Kim Acklin
Karen Ramirez
Margarete Hafley
Eckhard Alt
Jody Vykoukal
Robert S. Bresalier
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 1/2016
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/s13058-016-0757-6

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