Glutathione S-transferase isoenzymes in human tumors and tumor-derived cell lines
Author Information
Author(s): A.D. Lewis, L.M. Forrester, J.D. Hayes, C.J. Wareing, J. Carmichael, A.L. Harris, M. Mooghen, C.R. Wolf
Primary Institution: Imperial Cancer Research Fund, University Department of Biochemistry, University of Edinburgh, Newcastle General Hospital
Hypothesis
The study investigates the role of glutathione S-transferases in the resistance of tumors to anticancer drugs.
Conclusion
The study found that glutathione S-transferase activity was generally higher in solid tumors compared to cell lines, with significant variability in expression among different tumor types.
Supporting Evidence
- Overall GST activity was higher in tumors than in cell lines.
- The pi class GST subunit was the most abundant in both tumors and cell lines.
- Significant variability in GST expression was observed among different tumor types.
- MCF7 cell line had the lowest GST activity compared to other cell lines.
- Breast tumors showed lower GST levels compared to other solid tumors.
Takeaway
This study looked at how certain proteins in tumors help them resist cancer treatments, finding that tumors usually have more of these proteins than the lab-grown cells used to study them.
Methodology
The study measured glutathione S-transferase activity and isozyme composition in nine human tumor cell lines and compared these with solid tumor samples.
Limitations
The study notes that differences in GST expression may be due to the loss of expression during cell line generation or the individuality of human tumors.
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