Abstract
Tamoxifen is an estrogen modulator widely used in the treatment of patients with ESR/ER-positive breast cancer; however, resistance limits its clinical application. Autophagy alterations have recently been suggested as a new mechanism for tamoxifen resistance. Glucose transporter 1 (GLUT1) has been reported to be associated with the development and metastasis of breast cancer, but the relationship among GLUT1, autophagy, and endocrine resistance remains unclear. Our present study found that GLUT1 expression and autophagy flux were upregulated in the tamoxifen-resistant breast cancer cell line MCF-7/TAMR-1 and that knockdown of GLUT1 promoted sensitization to tamoxifen. Moreover, knockdown of GLUT1 significantly decreased the enhancement of autophagy flux in tamoxifen-resistant cell lines. Furthermore, inhibiting autophagy in tamoxifen-resistant cells resulted in sensitization to tamoxifen. We conclude that GLUT1 contributes to tamoxifen resistance in breast cancer and that tamoxifen-resistant cells become resensitized to tamoxifen after GLUT1 silencing. These findings suggest GLUT1 as a new factor clinically associated with resistance to tamoxifen.
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Abbreviations
- Baf-A1:
-
Bafilomycin A 1
- CCK-8:
-
Cell counting Kit-8
- DAB:
-
Diaminobenzidine
- DEGs:
-
Differentially expressed genes
- DFS:
-
Disease-free survival
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- ER/ESR:
-
Estrogen receptor
- FBS:
-
Fetal bovine serum
- FOXO:
-
Forkhead box O
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- GEO:
-
Gene expression omnibus
- GLUT1:
-
Glucose transporter 1
- GO:
-
Gene Ontology
- HRP:
-
Horseradish peroxidase
- IC50:
-
Inhibitory concentration
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- PPI:
-
Protein-protein interaction
- PR:
-
Progesterone receptor
- SEM:
-
Structural equation modeling
- SERMs:
-
Selective ER modulators
- SD:
-
Standard deviation
- siRNA:
-
Small interfering RNA
- siGLUT1:
-
Small interfering GLUT1
- TAM:
-
Tamoxifen
- 4OH-T:
-
4-Hydroxy tamoxifen
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Acknowledgments
The authors would like to thank the Oncobiology Key Lab of the Heilongjiang Province Common Institution of Higher Learning.
Funding
The study was supported by the grants from the National Natural Science Foundation of China (81730074).
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Conception and design: QZ, MS. Development of methodology: MX, SZ, and YD. Acquisition of data: MS, SZ, YW, and YM. Analysis and interpretation of data: MS, SZ, and YM. Writing, review, and/or revision of the manuscript: MS, QZ, and YD. Administrative, technical, or material support: QZ, MS, and SZ. Study supervision: HJ. All authors read and approved the final manuscript.
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All procedures performed involving human participants in our study were in accordance with the ethical standards of the Institutional and/or research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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The authors declare that they have no conflict of interest.
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All experiments were performed in the Oncobiology Key Lab of the Heilongjiang Province Common Institution of Higher Learning and were not outsourced to companies. No papermill was used.
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Sun, M., Zhao, S., Duan, Y. et al. GLUT1 participates in tamoxifen resistance in breast cancer cells through autophagy regulation. Naunyn-Schmiedeberg's Arch Pharmacol 394, 205–216 (2021). https://doi.org/10.1007/s00210-020-01893-3
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DOI: https://doi.org/10.1007/s00210-020-01893-3