Wnt pathway activity in breast cancer sub-types and stem-like cells

Wnt signalling has been implicated in stem cell regulation however its role in breast cancer stem cell regulation remains unclear. We used a panel of normal and breast cancer cell lines to assess Wnt pathway gene and protein expression, and for the investigation of Wnt signalling within stem cell-en...

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Veröffentlicht in:PloS one 2013-07, Vol.8 (7), p.e67811-e67811
Hauptverfasser: Lamb, Rebecca, Ablett, Matthew P, Spence, Katherine, Landberg, Göran, Sims, Andrew H, Clarke, Robert B
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Ablett, Matthew P
Spence, Katherine
Landberg, Göran
Sims, Andrew H
Clarke, Robert B
description Wnt signalling has been implicated in stem cell regulation however its role in breast cancer stem cell regulation remains unclear. We used a panel of normal and breast cancer cell lines to assess Wnt pathway gene and protein expression, and for the investigation of Wnt signalling within stem cell-enriched populations, mRNA and protein expression was analysed after the selection of anoikis-resistant cells. Finally, cell lines and patient-derived samples were used to investigate Wnt pathway effects on stem cell activity in vitro. Wnt pathway signalling increased in cancer compared to normal breast and in both cell lines and patient samples, expression of Wnt pathway genes correlated with estrogen receptor (ER) expression. Furthermore, specific Wnt pathway genes were predictive for recurrence within subtypes of breast cancer. Canonical Wnt pathway genes were increased in breast cancer stem cell-enriched populations in comparison to normal breast stem cell-enriched populations. Furthermore in cell lines, the ligand Wnt3a increased whilst the inhibitor DKK1 reduced mammosphere formation with the greatest inhibitory effects observed in ER+ve breast cancer cell lines. In patient-derived metastatic breast cancer samples, only ER-ve mammospheres were responsive to the ligand Wnt3a. However, the inhibitor DKK1 efficiently inhibited both ER+ve and ER-ve breast cancer but not normal mammosphere formation, suggesting that the Wnt pathway is aberrantly activated in breast cancer mammospheres. Collectively, these data highlight differential Wnt signalling in breast cancer subtypes and activity in patient-derived metastatic cancer stem-like cells indicating a potential for Wnt-targeted treatment in breast cancers.
doi_str_mv 10.1371/journal.pone.0067811
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Furthermore in cell lines, the ligand Wnt3a increased whilst the inhibitor DKK1 reduced mammosphere formation with the greatest inhibitory effects observed in ER+ve breast cancer cell lines. In patient-derived metastatic breast cancer samples, only ER-ve mammospheres were responsive to the ligand Wnt3a. However, the inhibitor DKK1 efficiently inhibited both ER+ve and ER-ve breast cancer but not normal mammosphere formation, suggesting that the Wnt pathway is aberrantly activated in breast cancer mammospheres. Collectively, these data highlight differential Wnt signalling in breast cancer subtypes and activity in patient-derived metastatic cancer stem-like cells indicating a potential for Wnt-targeted treatment in breast cancers.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>23861811</pmid><doi>10.1371/journal.pone.0067811</doi><tpages>e67811</tpages><oa>free_for_read</oa></addata></record>
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subjects Aberration
Anoikis
Biology
Biotechnology
Breast cancer
Breast Neoplasms - genetics
Breast Neoplasms - metabolism
Breast Neoplasms - pathology
Cancer
Carcinoma, Ductal, Breast - genetics
Carcinoma, Ductal, Breast - metabolism
Carcinoma, Ductal, Breast - pathology
Carcinoma, Lobular - genetics
Carcinoma, Lobular - metabolism
Carcinoma, Lobular - pathology
Cell Line, Tumor
Comparative analysis
Dkk1 protein
Enrichment
Estrogen receptors
Estrogens
Ethics
Female
Gene expression
Gene Expression Profiling
Gene Expression Regulation, Neoplastic
Genes
Health aspects
Humans
Inhibitors
Intercellular Signaling Peptides and Proteins - genetics
Intercellular Signaling Peptides and Proteins - metabolism
Medical prognosis
Medical research
Medicine
Metastases
Metastasis
mRNA
Neoplasm Metastasis
Neoplastic Stem Cells - metabolism
Neoplastic Stem Cells - pathology
Organ Specificity
Patients
Populations
Proteins
Receptors, Estrogen - genetics
Receptors, Estrogen - metabolism
Rodents
Signal Transduction
Signaling
Stem cells
Tumor cell lines
Tumors
Wnt protein
Wnt3A Protein - genetics
Wnt3A Protein - metabolism
title Wnt pathway activity in breast cancer sub-types and stem-like cells
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