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BMC Cancer
Published in: BMC Cancer 1/2005

Open Access 01-12-2005 | Research article

Acquisition of anoikis resistance in human osteosarcoma cells does not alter sensitivity to chemotherapeutic agents

Authors: C Marcela Díaz-Montero, Bradley W McIntyre

Published in: BMC Cancer | Issue 1/2005

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Abstract

Background

Chemotherapy-induced cell death can involve the induction of apoptosis. Thus, aberrant function of the pathways involved might result in chemoresistance. Since cell adhesion to the extracellular matrix acts as a survival factor that homeostatically maintains normal tissue architecture, it was tested whether acquisition of resistance to deadhesion-induced apoptosis (anoikis) in human osteosarcoma would result in resistance to chemotherapy.

Methods

Osteosarcoma cell lines (SAOS-2 and TE-85) obtained from ATCC and were maintained in complete Eagle's MEM medium. Suspension culture was established by placing cells in tissue culture wells coated with poly-HEMA. Cell cytotoxicity was determined using a live/dead cytotoxicity assay. Cell cycle/apoptosis analyses were performed using propidium iodide (PI) staining with subsequent FACS analysis. Apoptosis was also assayed by Annexin-FITC/PI staining.

Results

Etoposide, adriamycin, vinblastine, cisplatin and paclitaxel were able to induce apoptosis in human osteosarcoma cells SAOS-2 regardless of their anoikis resistance phenotype or the culture conditions (adhered vs. suspended). Moreover, suspended anoikis resistant TE-85 cells (TE-85ar) retained their sensitivity to chemotherapy as well.

Conclusion

Acquisition of anoikis resistance in human osteosarcoma cells does not result in a generalized resistance to all apoptotic stimuli, including chemotherapy. Moreover, our results suggest that the pathways regulating anoikis resistance and chemotherapy resistance might involve the action of different mediators.
Appendix
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Metadata
Title
Acquisition of anoikis resistance in human osteosarcoma cells does not alter sensitivity to chemotherapeutic agents
Authors
C Marcela Díaz-Montero
Bradley W McIntyre
Publication date
01-12-2005
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2005
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-5-39

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