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Published in: Breast Cancer Research 4/2010

Open Access 01-08-2010 | Research article

Doxorubicin downregulates cell surface B7-H1 expression and upregulates its nuclear expression in breast cancer cells: role of B7-H1 as an anti-apoptotic molecule

Authors: Hazem Ghebeh, Cynthia Lehe, Eman Barhoush, Khaldoon Al-Romaih, Asma Tulbah, Monther Al-Alwan, Siti-Faujiah Hendrayani, Pulicat Manogaran, Ayodele Alaiya, Taher Al-Tweigeri, Abdelilah Aboussekhra, Said Dermime

Published in: Breast Cancer Research | Issue 4/2010

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Abstract

Introduction

B7-H1 (PD-L1, CD274) is a T cell inhibitory molecule expressed in many types of cancer, leading to immune escape of tumor cells. Indeed, in previous reports we have shown an association of B7-H1 expression with high-risk breast cancer patients.

Methods

In the current study, we used immunohistochemistry, immunofluorescence and Western blot techniques to investigate the effect of neoadjuvant chemotherapy on the expression of B7-H1 in breast cancer cells.

Results

Among tested chemotherapeutic agents, doxorubicin was the most effective in downregulating cell surface expression of B7-H1 in vitro. These results were validated in vivo in a xenograft mouse model, as well as in murine heart tissue known to constitutively express B7-H1. The doxorubicin-dependent cell surface downregulation of B7-H1 was accompanied by an upregulation of B7-H1 in the nucleus. This re-distribution of B7-H1 was concurrent with a similar translocation of phosphorylated AKT to the nucleus. Inhibition of the PI3K/AKT pathway abrogated the doxorubicin-mediated nuclear up-regulation of B7-H1, suggesting an involvement of PI3K/AKT pathway in the nuclear up-regulation of B7-H1. Interestingly, siRNA knock down of B7-H1 lead to an increase in spontaneous apoptosis, as well as doxorubicin-induced apoptosis, which indicates an anti-apoptotic role for B7-H1 in breast cancer cells. The novel discovery of B7-H1 expression in the nuclei of breast cancer cells suggests that B7-H1 has functions other than inhibition of T cells.

Conclusions

Our findings explain the previously reported immunomodulatory effect of anthracyclines on cancer cells, and provide a link between immunoresistance and chemoresistance. Finally these results suggest the use of dual combinatorial agents to inhibit B7-H1 beside chemotherapy, in breast cancer patients.
Appendix
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Metadata
Title
Doxorubicin downregulates cell surface B7-H1 expression and upregulates its nuclear expression in breast cancer cells: role of B7-H1 as an anti-apoptotic molecule
Authors
Hazem Ghebeh
Cynthia Lehe
Eman Barhoush
Khaldoon Al-Romaih
Asma Tulbah
Monther Al-Alwan
Siti-Faujiah Hendrayani
Pulicat Manogaran
Ayodele Alaiya
Taher Al-Tweigeri
Abdelilah Aboussekhra
Said Dermime
Publication date
01-08-2010
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 4/2010
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr2605

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