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Breast Cancer Research and Treatment
Published in: Breast Cancer Research and Treatment 1/2012

01-05-2012 | Preclinical Study

Alteration of Y-box binding protein-1 expression modifies the response to endocrine therapy in estrogen receptor-positive breast cancer

Authors: Tokiko Ito, Shinobu Kamijo, Hiroto Izumi, Kimitoshi Kohno, Jun Amano, Ken-ichi Ito

Published in: Breast Cancer Research and Treatment | Issue 1/2012

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Abstract

Y-box binding protein-1 (YB-1) plays an important role in tumor progression and drug resistance. This study examined whether YB-1 is involved in the alteration of response to endocrine therapy in estrogen receptor (ER)-positive breast cancer cells. MCF7 cells that stably expressed YB-1 (MCF7-YB-1) and vector control cells (MCF7-vector) were established. These cells were used to analyze the expression of the factors related to ER and growth factor receptor signaling pathways and responses to antiestrogens (tamoxifen and fulvestrant) and estrogen responsive element (ERE) activity. The effect of knocking down endogenous YB-1 expression was tested in wild-type MCF7 cells. In addition, the expression of YB-1 and the factors related to ER and growth factor receptor signaling pathways were evaluated in clinical breast cancers treated with preoperative chemotherapy. The expression of HER2, AIB1, p-Erk, and c-Myc was increased in MCF7-YB-1 cells. In contrast, knocking down of YB-1 decreased the expression of these factors but increased the expression of ERα in wild-type MCF7 cells. Furthermore, sensitivity to antiestrogens was decreased in the MCF7-YB-1 in comparison to that in MCF7-vector cells. The introduction of YB-1 into MCF7 cells inhibited apoptosis and cell cycle arrest at G1 phase induced by antiestrogens. In MCF7-YB-1 cells, the expression levels of p-Erk and c-Myc were continuously upregulated when cells were treated with either tamoxifen or fulvestrant. The ERE activity was reduced in MCF7-YB-1 cells in comparison to MCF7-vector cells, and the ERE activity in MCF7-YB-1 cells was inhibited by fulvestrant at a lower concentration than that which inhibited the ERE activity in MCF7-vector cells. In ER-positive clinical breast cancers treated with preoperative chemotherapy, significantly more number of specimens that showed increased or positive YB-1 expression after chemotherapy was positive for HER2 expression. These data suggest that alteration of YB-1 may modify the crosstalk between the ER pathway and HER2 pathway in ER-positive breast cancer cells, and consequently, may alter the response to endocrine therapy in ER-positive breast cancer cells.
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Metadata
Title
Alteration of Y-box binding protein-1 expression modifies the response to endocrine therapy in estrogen receptor-positive breast cancer
Authors
Tokiko Ito
Shinobu Kamijo
Hiroto Izumi
Kimitoshi Kohno
Jun Amano
Ken-ichi Ito
Publication date
01-05-2012
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 1/2012
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-011-1731-8

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