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Published in: BMC Cancer 1/2012

Open Access 01-12-2012 | Research article

Doxorubicin-enriched, ALDHbr mouse breast cancer stem cells are treatable to oncolytic herpes simplex virus type 1

Authors: Xiufen Zhuang, Wen Zhang, Yatong Chen, Xiangping Han, Jie Li, Yu Zhang, Youhui Zhang, Shuren Zhang, Binlei Liu

Published in: BMC Cancer | Issue 1/2012

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Abstract

Background

The primary objective of this study was to test whether oncolytic herpes simplex virus type 1 (HSV1) could eradicate chemoresistant cancer stem cells (CSCs).

Methods

The fluorescent aldefluor reagent-based technique was used to identify and isolate ALDHbr cells as CSCs from the 4T1 murine breast cancer cell line. The presence of ALDHbr 4T1 cells was also examined in 4T1 breast cancer transplanted in immune-competent syngeneic mice.

Results

Compared with ALDHlo cells, ALDHbr cells had a markedly higher ability to form tumor spheres in vitro and a higher tumorigenic potential in vivo. ALDHbr cells also exhibited increased doxorubicin resistance in vitro, which correlated with a selective increase in the percentage of ALDHbr cells after doxorubicin treatment and an increased expression of P-glycoprotein (P-gp), a known chemoresistance factor. In contrast, oncolytic HSV1 was able to kill ALDHbr cells in vitro and even more markedly in vivo. Furthermore, in in vivo studies, systemic administration of doxorubicin followed by intratumoral injection of oncolytic HSV1 resulted in much more significant suppression of tumor growth with increased median survival period compared with each treatment given alone (p<0.05). Though more CD8+ T lymphocytes were induced by oncolytic HSV1, no significant specific T cell response against CSCs was detected in vivo.

Conclusions

These results suggested that the use of oncolytic HSV1 following doxorubicin treatment may help eradicate residual chemoresistant CSCs in vivo.
Appendix
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Metadata
Title
Doxorubicin-enriched, ALDHbr mouse breast cancer stem cells are treatable to oncolytic herpes simplex virus type 1
Authors
Xiufen Zhuang
Wen Zhang
Yatong Chen
Xiangping Han
Jie Li
Yu Zhang
Youhui Zhang
Shuren Zhang
Binlei Liu
Publication date
01-12-2012
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2012
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-12-549

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