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Published in: BMC Cancer 1/2012

Open Access 01-12-2012 | Research article

Therapeutic implications of an enriched cancer stem-like cell population in a human osteosarcoma cell line

Authors: Sara R Martins-Neves, Áurio O Lopes, Anália do Carmo, Artur A Paiva, Paulo C Simões, Antero J Abrunhosa, Célia MF Gomes

Published in: BMC Cancer | Issue 1/2012

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Abstract

Background

Osteosarcoma is a bone-forming tumor of mesenchymal origin that presents a clinical pattern that is consistent with the cancer stem cell model. Cells with stem-like properties (CSCs) have been identified in several tumors and hypothesized as the responsible for the relative resistance to therapy and tumor relapses. In this study, we aimed to identify and characterize CSCs populations in a human osteosarcoma cell line and to explore their role in the responsiveness to conventional therapies.

Methods

CSCs were isolated from the human MNNG/HOS cell line using the sphere formation assay and characterized in terms of self-renewal, mesenchymal stem cell properties, expression of pluripotency markers and ABC transporters, metabolic activity and tumorigenicity. Cell's sensitivity to conventional chemotherapeutic agents and to irradiation was analyzed and related with cell cycle-induced alterations and apoptosis.

Results

The isolated CSCs were found to possess self-renewal and multipotential differentiation capabilities, express markers of pluripotent embryonic stem cells Oct4 and Nanog and the ABC transporters P-glycoprotein and BCRP, exhibit low metabolic activity and induce tumors in athymic mice. Compared with parental MNNG/HOS cells, CSCs were relatively more resistant to both chemotherapy and irradiation. None of the treatments have induced significant cell-cycle alterations and apoptosis in CSCs.

Conclusions

MNNG/HOS osteosarcoma cells contain a stem-like cell population relatively resistant to conventional chemotherapeutic agents and irradiation. This resistant phenotype appears to be related with some stem features, namely the high expression of the drug efflux transporters P-glycoprotein and BCRP and their quiescent nature, which may provide a biological basis for resistance to therapy and recurrence commonly observed in osteosarcoma.
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Metadata
Title
Therapeutic implications of an enriched cancer stem-like cell population in a human osteosarcoma cell line
Authors
Sara R Martins-Neves
Áurio O Lopes
Anália do Carmo
Artur A Paiva
Paulo C Simões
Antero J Abrunhosa
Célia MF Gomes
Publication date
01-12-2012
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2012
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-12-139

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