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Characterization of multidrug resistance-associated protein mRNAs expression profiles in Caco-2 and HT-1080 cell

K Ikeda1, M Myotoku, Y Hirotani

  • 1Laboratory of Clinical Pharmaceutics, Faculty of Pharmacy, Osaka Ohtani University, Tondabayashi, Osaka, Japan. ikedak@osaka-ohtani.ac.jp

Die Pharmazie
|January 31, 2009
PubMed

Insights

Multidrug resistance-associated proteins (MRPs) influence methotrexate (MTX) resistance. This study compared MRP mRNA expression in MTX-resistant Caco-2 and MTX-sensitive HT-1080 cells, revealing distinct profiles linked to resistance.

Area of Science:

  • Pharmacology and Molecular Biology
  • Cancer Cell Biology
  • Drug Resistance Mechanisms

Background:

  • Multidrug resistance-associated proteins (MRPs) mediate drug efflux, contributing to resistance against chemotherapeutic agents like methotrexate (MTX).
  • The Caco-2 cell line exhibits high MRP expression and is presumed resistant to MTX, while the HT-1080 cell line is reportedly sensitive.
  • Understanding differential MRP expression is crucial for elucidating MTX resistance mechanisms in cancer cells.

Purpose of the Study:

  • To compare the growth-inhibitory effects of MTX on Caco-2 and HT-1080 cell lines.
  • To characterize the mRNA expression profiles of MRPs (1-8) in both cell lines before and after MTX exposure.
  • To investigate the association between MRP expression patterns and MTX sensitivity.

Main Methods:

  • Comparative analysis of MTX growth-inhibitory activity in Caco-2 and HT-1080 cells.
  • Multiplex reverse-transcription-polymerase chain reaction (RT-PCR) to quantify MRP (1-8) mRNA expression.
  • Examination of MRP mRNA expression profiles pre- and post-MTX treatment.

Main Results:

  • HT-1080 cells displayed lower mRNA expression of MRP2, MRP3, MRP6, and MRP8 compared to Caco-2 cells.
  • MRP5 mRNA expression was specifically induced in Caco-2 cells following MTX treatment.
  • Significant differences in MRP mRNA expression profiles were observed between the two cell lines.

Conclusions:

  • Differential MRP mRNA expression profiles correlate with varying MTX sensitivity in Caco-2 and HT-1080 cells.
  • Characterization of MRP expression is potentially linked to MTX resistance mechanisms.
  • The multiplex RT-PCR method is a valuable tool for time-dependent investigations of MRP mRNA expression.

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