Abstract
Aims
Proteomic study was used to explore new multidrug resistance (MDR)-related proteins and clarify novel mechanism of MDR in gastric cancer.
Methods
Two-dimensional gel electrophoresis and the PDQuest software analysis were applied to compare the differential expression of MDR-related proteins in gastric cancer SGC7901 cells and drug-resistant SGC7901 cells (SGC7901/VCR) induced by vincristine sulfate (VCR). The differential protein dots were excised and further analyzed by matrix-assisted laser desorption ionization-time of flight mass spectrometry analysis (MALDI-TOF-MS).
Results
Nine differential expression proteins between the two cell lines were successfully identified by MALDI-TOF-MS. Triosephosphate isomerase (TPI), a glycolytic pathway enzyme, was identified as a downregulated protein in SGC7901/VCR cells. Further, Western blot analysis and semiquantitative RT-PCR confirmed its decreased expression in SGC7901/VCR cells. Sense vector pcDNA3.1-TPI was constructed and transfected into SGC7901/VCR. The sensitivity of TPI-SGC7901/VCR cells to adriamycin (ADR), VCR, 5-fluorouracil and cis-dichlorodiamine platinum, as well as the accumulation and retention to ADR, were significantly increased when compared to their control cell lines.
Conclusions
These results provide new MDR-related protein candidates, which are differentially expressed in the MDR cell line and its parental cell line including TPI, which may participate in the VCR-mediated MDR in human gastric cancer. Upregulation of TPI expression could partially reverse multidrug-resistant phenotype of SGC7901/VCR, which suggests that TPI may be an anti-drug resistance agent in gastric cancer and the candidate target to develop novel therapeutics for better treatment of gastric cancer.
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Abbreviations
- MDR:
-
Multidrug resistance
- GST:
-
Glutathione S-transferase
- LRP:
-
Lung resistance protein
- MRP:
-
Multidrug resistance-associated protein
- PBS:
-
Phosphate-buffered saline
- P-gp:
-
P-glycoprotein
- RP:
-
Ribosomal protein
- SDS:
-
Sodium dodecyl sulfate
- MALDI-TOF-MS:
-
Matrix-assisted laser desorption ionization-time of flight-mass spectrometry
- PMF:
-
Peptide mass fingerprint
- TPI:
-
Triosephosphate isomerase
- VCR:
-
Vincristine
- ADR:
-
Adriamycin
- 5-Fu:
-
5-Fluorouracil
- MMC:
-
Mitomycin C
- CCDP:
-
cis-Dichlorodiamine platinum
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Acknowledgments
This work was supported by grants from National Natural Science Foundation of China (No. 30672399 and No. 30371762).
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Xin Wang and Yuanyuan Lu contributed equally to this work.
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Wang, X., Lu, Y., Yang, J. et al. Identification of triosephosphate isomerase as an anti-drug resistance agent in human gastric cancer cells using functional proteomic analysis. J Cancer Res Clin Oncol 134, 995–1003 (2008). https://doi.org/10.1007/s00432-008-0367-5
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DOI: https://doi.org/10.1007/s00432-008-0367-5