Reversal of Drug Resistance in Cancer Cells by Tamoxifen
Author Information
Author(s): M. Chatterjee, A.L. Harris
Primary Institution: University of Newcastle upon Tyne; ICRF Clinical Oncology Unit, Churchill Hospital
Hypothesis
Can tamoxifen and its metabolite reverse multidrug resistance in CHO cells resistant to adriamycin?
Conclusion
Tamoxifen and 4-hydroxy tamoxifen can reverse multidrug resistance in CHO cells, but their effectiveness is reduced by high levels of alpha 1 acid glycoprotein.
Supporting Evidence
- Tamoxifen decreased the IC50 of adriamycin significantly in both parent and resistant CHO cell lines.
- 4-hydroxy tamoxifen also reduced the IC50 of adriamycin in resistant cells.
- High concentrations of alpha 1 acid glycoprotein reduced the effectiveness of tamoxifen.
Takeaway
Tamoxifen can help cancer cells that are resistant to a drug called adriamycin become sensitive to it again, but too much of a certain protein in the blood can make this less effective.
Methodology
The study used CHO cell lines to assess the effects of tamoxifen and 4-hydroxy tamoxifen on reversing drug resistance, measuring IC50 values and drug binding.
Limitations
The study was conducted in vitro, and the effects of AAG in vivo may differ.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
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