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Calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin

Putative cancer stem cells are a subpopulation of cancer cells that give rise to chemotherapy resistance and are therefore of prognostic and therapeutic interest, though their identification remains elusive in colon cancer due to lack of reliable and accurate markers. We previously identified a p53-...

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Autores principales: Allen, Joshua E., El-Deiry, Wafik S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Impact Journals LLC 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3712565/
https://www.ncbi.nlm.nih.gov/pubmed/23468473
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author Allen, Joshua E.
El-Deiry, Wafik S.
author_facet Allen, Joshua E.
El-Deiry, Wafik S.
author_sort Allen, Joshua E.
collection PubMed
description Putative cancer stem cells are a subpopulation of cancer cells that give rise to chemotherapy resistance and are therefore of prognostic and therapeutic interest, though their identification remains elusive in colon cancer due to lack of reliable and accurate markers. We previously identified a p53-dependent putative cancer stem cell population, the calcein low population (C(lo)P), based on their exclusive efflux of the fluorescent dye Calcein. This functional identification method enables comparative live cell studies of subpopulations without differential toxicity that occurs with traditional Hoechst methods, which has confounded conclusions and limited the utility of this cancer stem cell marker. In this study, we examined the cancer stem cell-like properties of the C(lo)P population in vivo in comparison with the parental and calcein-high population (C(hi)P) in human colon cancer xenografts. Serial dilution xenograft experiments in NOD/SCID mice revealed that the C(lo)P is only marginally more tumorigenic compared to the C(hi)P or parental cells. However, serial passage of these tumors revealed that the C(lo)P is uniquely enriched for self-renewal capacity in vivo compared to the other populations. Immunohistochemical analysis of these tumors revealed that the C(lo)P possesses increased levels of nuclear β-catenin and furthermore, siRNA-mediated knockdown of β-catenin significantly reduced the C(lo)P population. These findings highlight the C(lo)P as an important subpopulation of tumor cells that are exclusively endowed with the ability to self-renew and propagate tumors. The dependency of the C(lo)P on β-catenin provides a molecular explanation for this ability and suggests that this population can and should be therapeutically targeted by inhibition of Wnt signaling.
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spelling pubmed-37125652013-07-22 Calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin Allen, Joshua E. El-Deiry, Wafik S. Oncotarget Research Paper Putative cancer stem cells are a subpopulation of cancer cells that give rise to chemotherapy resistance and are therefore of prognostic and therapeutic interest, though their identification remains elusive in colon cancer due to lack of reliable and accurate markers. We previously identified a p53-dependent putative cancer stem cell population, the calcein low population (C(lo)P), based on their exclusive efflux of the fluorescent dye Calcein. This functional identification method enables comparative live cell studies of subpopulations without differential toxicity that occurs with traditional Hoechst methods, which has confounded conclusions and limited the utility of this cancer stem cell marker. In this study, we examined the cancer stem cell-like properties of the C(lo)P population in vivo in comparison with the parental and calcein-high population (C(hi)P) in human colon cancer xenografts. Serial dilution xenograft experiments in NOD/SCID mice revealed that the C(lo)P is only marginally more tumorigenic compared to the C(hi)P or parental cells. However, serial passage of these tumors revealed that the C(lo)P is uniquely enriched for self-renewal capacity in vivo compared to the other populations. Immunohistochemical analysis of these tumors revealed that the C(lo)P possesses increased levels of nuclear β-catenin and furthermore, siRNA-mediated knockdown of β-catenin significantly reduced the C(lo)P population. These findings highlight the C(lo)P as an important subpopulation of tumor cells that are exclusively endowed with the ability to self-renew and propagate tumors. The dependency of the C(lo)P on β-catenin provides a molecular explanation for this ability and suggests that this population can and should be therapeutically targeted by inhibition of Wnt signaling. Impact Journals LLC 2013-02-18 /pmc/articles/PMC3712565/ /pubmed/23468473 Text en Copyright: © 2013 Allen and El-Deiry http://creativecommons.org/licenses/by/2.5/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
spellingShingle Research Paper
Allen, Joshua E.
El-Deiry, Wafik S.
Calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin
title Calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin
title_full Calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin
title_fullStr Calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin
title_full_unstemmed Calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin
title_short Calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin
title_sort calcein-effluxing human colon cancer cells are enriched for self-renewal capacity and depend on β-catenin
topic Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3712565/
https://www.ncbi.nlm.nih.gov/pubmed/23468473
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