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Journal of Translational Medicine
Published in: Journal of Translational Medicine 1/2011

Open Access 01-12-2011 | Research

Differentiation of breast cancer stem cells by knockdown of CD44: promising differentiation therapy

Authors: Phuc V Pham, Nhan LC Phan, Nhung T Nguyen, Nhung H Truong, Thuy T Duong, Dong V Le, Kiet D Truong, Ngoc K Phan

Published in: Journal of Translational Medicine | Issue 1/2011

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Abstract

Background

Breast cancer stem cells (BCSCs) are the source of breast tumors. Compared with other cancer cells, cancer stem cells show high resistance to both chemotherapy and radiotherapy. Targeting of BCSCs is thus a potentially promising and effective strategy for breast cancer treatment. Differentiation therapy represents one type of cancer stem-cell-targeting therapy, aimed at attacking the stemness of cancer stem cells, thus reducing their chemo- and radioresistance. In a previous study, we showed that down-regulation of CD44 sensitized BCSCs to the anti-tumor agent doxorubicin. This study aimed to determine if CD44 knockdown caused BCSCs to differentiate into breast cancer non-stem cells (non-BCSCs).

Methods

We isolated a breast cancer cell population (CD44+CD24- cells) from primary cultures of malignant breast tumors. These cells were sorted into four sub-populations based on their expression of CD44 and CD24 surface markers. CD44 knockdown in the BCSC population was achieved using small hairpin RNA lentivirus particles. The differentiated status of CD44 knock-down BCSCs was evaluated on the basis of changes in CD44+CD24- phenotype, tumorigenesis in NOD/SCID mice, and gene expression in relation to renewal status, metastasis, and cell cycle in comparison with BCSCs and non-BCSCs.

Results

Knockdown of CD44 caused BCSCs to differentiate into non-BCSCs with lower tumorigenic potential, and altered the cell cycle and expression profiles of some stem cell-related genes, making them more similar to those seen in non-BCSCs.

Conclusions

Knockdown of CD44 is an effective strategy for attacking the stemness of BCSCs, resulting in a loss of stemness and an increase in susceptibility to chemotherapy or radiation. The results of this study highlight a potential new strategy for breast cancer treatment through the targeting of BCSCs.
Appendix
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Metadata
Title
Differentiation of breast cancer stem cells by knockdown of CD44: promising differentiation therapy
Authors
Phuc V Pham
Nhan LC Phan
Nhung T Nguyen
Nhung H Truong
Thuy T Duong
Dong V Le
Kiet D Truong
Ngoc K Phan
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2011
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/1479-5876-9-209

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