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Related Experiment Videos

Is there any correlation between MDR1, GST-pi-expression and CEA?

C Weissenberger1, H H Fiebig, J Lutterbach

  • 1Department of Radiotherapy, University of Freiburg, Hugstetter Strasse 55, D-79106 Freiburg i.Brsg., Germany. weissenb@ukl.uni.freiburg.de

Anticancer Research
|May 1, 2001
PubMed
Summary

Evaluating the tumor marker carcinoembryonic antigen (CEA) can help identify tumors with high multidrug resistance (MDR1) and glutathione-S-transferase pi (GST-pi) expression, suggesting a shared regulatory mechanism.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Multidrug resistance (MDR1) and glutathione-S-transferase pi (GST-pi) are key factors in cancer treatment failure.
  • Tumor markers, such as carcinoembryonic antigen (CEA), are often overexpressed in various cancers.

Purpose of the Study:

  • To investigate the correlation between mRNA expression of MDR1 and GST-pi and the immunohistochemical expression of tumor markers.
  • To determine if CEA expression is associated with higher levels of MDR1 and GST-pi.

Main Methods:

  • Analysis of total mRNA using Northern and slot blots.
  • Immunohistochemical assessment of CEA and other tumor markers in a diverse panel of tumors.
  • Statistical analysis using the Wilcoxon Test to compare expression levels.

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Main Results:

  • CEA-positive tumors exhibited significantly higher expression of both MDR1 and GST-pi compared to CEA-negative tumors.
  • MDR1 expression was significantly higher in CEA-positive tumors (mean rank 14.3 vs. 7.8; p < 0.05).
  • GST-pi expression was also significantly higher in CEA-positive tumors (mean rank 15.3 vs. 5.9; p < 0.001).

Conclusions:

  • CEA evaluation can aid in discriminating between tumors with high or low drug resistance.
  • The observed correlation suggests a potential common regulatory mechanism for drug resistance and CEA expression.