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Get Free AccessBreast cancer stem cells (BCSCs) play a critical role in tumor recurrence and metastasis. Exposure of breast cancer cells to chemotherapy leads to an enrichment of BCSCs. Here, we find that chemotherapy induces the expression of glutathione S-transferase omega 1 (GSTO1), which is dependent on hypoxia-inducible factor 1 (HIF-1) and HIF-2. Knockdown of GSTO1 expression abrogates carboplatin-induced BCSC enrichment, decreases tumor initiation and metastatic capacity, and delays tumor recurrence after chemotherapy. GSTO1 interacts with the ryanodine receptor RYR1 and promotes calcium release from the endoplasmic reticulum. Increased cytosolic calcium levels activate PYK2 → SRC → STAT3 signaling, leading to increased expression of pluripotency factors and BCSC enrichment. HIF inhibition blocks chemotherapy-induced GSTO1 expression and BCSC enrichment. Combining HIF inhibitors with chemotherapy may improve clinical outcome in breast cancer.
Haiquan Lu, Ivan Chen, Larissa A. Shimoda, Youngrok Park, Chuanzhao Zhang, Thi My Linh Tran, Huimin Zhang, Gregg L. Friedman (2017). Chemotherapy-Induced Ca2+ Release Stimulates Breast Cancer Stem Cell Enrichment. , 18(8), DOI: https://doi.org/10.1016/j.celrep.2017.02.001.
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Type
Article
Year
2017
Authors
8
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1016/j.celrep.2017.02.001
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