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Erschienen in: Breast Cancer Research and Treatment 1/2018

27.07.2018 | Preclinical study

Oestrogen receptor-regulated glutathione S-transferase mu 3 expression attenuates hydrogen peroxide-induced cytotoxicity, which confers tamoxifen resistance on breast cancer cells

verfasst von: Juo-Han Lin, Shih-Hsin Tu, Li-Ching Chen, Chi-Cheng Huang, Hang-Lung Chang, Tzu-Chun Cheng, Hui-Wen Chang, Chih-Hsiung Wu, Han-Chung Wu, Yuan-Soon Ho

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 1/2018

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Abstract

Purpose

Glutathione S-transferase mu 3 (GSTM3) is an enzyme involving in the detoxification of electrophilic compounds by conjugation with glutathione. Higher GSTM3 mRNA levels were reported in patients with ERα-positive breast cancer who received only tamoxifen therapy after surgery. Thus, this study aimed to clarify the oncogenic characteristics of GSTM3 in breast cancer and the mechanism of tamoxifen resistance.

Methods

GSTM3 expression in human breast tumour tissues (n = 227) was analysed by RT-PCR and quantitative PCR. Western blot, promoter activity assays, and chromatin immunoprecipitation (ChIP) assays were used to investigate the mechanism of GSTM3 gene regulation. Hydrogen peroxide (H2O2)-induced cytotoxicity in breast cancer cells was detected by MTT assays and flow cytometry. The oncogenic characteristics of GSTM3 in MCF-7 cells were examined by siRNA knockdown in soft agar assays and a xenograft animal model.

Results

GSTM3 mRNA was highly expressed in ER- and HER2-positive breast cancers. Moreover, patients who received adjuvant Herceptin had increased GSTM3 mRNA levels in tumour tissue. Oestrogen-activated GSTM3 gene expression through ERα-mediated recruitment of SP1, EP300, and AP-1 complexes. GSTM3-silenced MCF-7 cells were more sensitive to H2O2, with significantly inhibited proliferation and colony formation abilities. Tamoxifen-resistant (Tam-R) cells lacking GSTM3 showed enhanced sensitivity to H2O2, but this result was contrary to that obtained after short-term tamoxifen exposure. The animal model suggested that GSTM3 silencing might suppress the tumourigenic ability of MCF-7 cells and increase tumour cell apoptosis.

Conclusions

ROS production is one mechanism by which cancer drugs kill tumour cells, and according to our evidence, GSTM3 may play an important role in preventing breast cancer treatment-induced cellular cytotoxicity.
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Metadaten
Titel
Oestrogen receptor-regulated glutathione S-transferase mu 3 expression attenuates hydrogen peroxide-induced cytotoxicity, which confers tamoxifen resistance on breast cancer cells
verfasst von
Juo-Han Lin
Shih-Hsin Tu
Li-Ching Chen
Chi-Cheng Huang
Hang-Lung Chang
Tzu-Chun Cheng
Hui-Wen Chang
Chih-Hsiung Wu
Han-Chung Wu
Yuan-Soon Ho
Publikationsdatum
27.07.2018
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 1/2018
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-018-4897-5

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