Abstract
Purpose
This study aimed to explore the mechanism of multi-drug resistance (MDR) in 5-fluorouracil (5-FU)-induced breast cancer cell MCF-7.
Methods
MCF-7 cells were exposed in stepwise escalating concentration of 5-FU to develop the resistant cell line, MCF-7/5-FU. Biological and molecular characteristics of the cells were studied through MTT, flow cytometry, real-time PCR, western-blot, and the global protein profiles between MCF-7/5-FU and parental MCF-7 were compared using proteomic approach. Then some of the differentially expressed proteins were validated by western-blot. In addition, the role of 14-3-3σ was validated using gene transfection.
Results
Drug resistance of MCF-7/5-FU cells to 5-FU, MX, cDDP, ADM, TAXOL all increased significantly compared with MCF-7 cells and that maybe related to BCRP, but not MDR1 and MRP1. Differentially expressed proteins between MCF-7/5-FU and MCF-7 cells were identified; 12 proteins were up-regulated and 18 proteins were down-regulated in MCF-7/5-FU cells. Expressive levels of some proteins in western-blot validation were consistent with the results in proteomic analysis. Enforced 14-3-3σ expression can increase the sensitivity of MCF-7/5-FU cells to 5-FU and cDDP.
Conclusion
MDR of MCF-7/5-FU likely associated with differentially expressed proteins and 14-3-3σ may play a positive role in chemotherapy. These findings may provide theoretical support for the prediction of chemotherapeutic response and reverse of MDR.
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Abbreviations
- 5-FU:
-
5-Fluorouracil
- MX:
-
Mitoxantrone
- cDDP:
-
Cisplatin
- ADM:
-
Adramycin
- BCRP:
-
Breast cancer resistance protein
- MDR1:
-
P-glycoprotein
- MRP1:
-
Multidrug resistance-associated protein
- 2-DE:
-
Two-dimensional gel electrophoresis
- MALDI-TOF–MS:
-
Matrix-assisted laser desorption/ionization-time of flight mass spectrometry
- MDR:
-
Multi-drug resistance
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G. Zheng and F. Peng contributed equally to this work.
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Zheng, G., Peng, F., Ding, R. et al. Identification of proteins responsible for the multiple drug resistance in 5-fluorouracil-induced breast cancer cell using proteomics analysis. J Cancer Res Clin Oncol 136, 1477–1488 (2010). https://doi.org/10.1007/s00432-010-0805-z
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DOI: https://doi.org/10.1007/s00432-010-0805-z