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Related Experiment Videos

MDR1 expression in human leukemia-lymphoma cell lines

K Metge1, K Steube, C C Uphoff

  • 1DSM-German Collection of Microorganisms and Cell Cultures, Department of Human and Animal Cell Cultures, Braunschweig.

Leukemia
|June 1, 1993
PubMed
Summary

The multidrug resistance (MDR) gene mdr1 shows limited expression in most human tumor cell lines. Functional expression of mdr1 mRNA and p170 glycoprotein is rare in unmanipulated cell lines.

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • The multidrug resistance (MDR) gene, mdr1, encodes the P-glycoprotein (p170), a transporter protein.
  • P-glycoprotein is implicated in the efflux of various chemotherapeutic drugs from cancer cells, contributing to treatment resistance.

Purpose of the Study:

  • To investigate the expression of the mdr1 gene in a panel of human tumor cell lines.
  • To determine the functional expression of mdr1 mRNA and p170 glycoprotein in these cell lines.

Main Methods:

  • Northern blot analysis was used to detect mdr1 mRNA expression.
  • Immunocytochemical staining with the anti-p170 glycoprotein monoclonal antibody JSB-1 was performed.

Main Results:

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  • Only three of 90 human tumor cell lines (KB-V1, EM-2, A-704) exhibited mdr1 mRNA expression.
  • P-glycoprotein (p170) expression was detected only in the KB-V1 cell line, a known positive control.

    • Conclusions:

    • The mdr1 gene is not functionally expressed in the majority of unmanipulated human tumor cell lines.
    • This suggests that continuous cell lines may not accurately reflect mdr1 expression in freshly explanted tumor cells.