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Microarray Expression Profiling of ABC Transporters in Human Breast Cancer

Jean-Pierre Gillet1, Jose Schneider2, Vincent Bertholet3

  • 1Department of Biology, URBC, University of Namur (FUNDP), Namur, Belgium.

Cancer Genomics & Proteomics
|August 10, 2019
PubMed

Insights

This study reveals that most ATP-binding cassette (ABC) transporters are highly expressed in breast tumors, regardless of treatment. This finding highlights their potential role in tumor development and drug resistance.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genomics

Background:

  • ATP-binding cassette (ABC) transporters are crucial for membrane transport.
  • Dysregulation of ABC transporters is implicated in tumor drug resistance and potentially tumor phenotype.
  • A novel microarray platform allows analysis of multiple ABC transporter genes.

Purpose of the Study:

  • To investigate the expression profile of 41 transporters, including 38 ABC transporters, in breast cancer patient samples.
  • To compare transporter expression between treated and untreated breast tumors.
  • To validate microarray findings using real-time PCR.

Main Methods:

  • Utilized a low-density DNA microarray to analyze gene expression in 16 breast cancer patient samples.
  • Performed real-time PCR for validation of microarray data on 15 selected ABC transporter genes.
  • Compared expression levels between treated and untreated tumor samples.

Main Results:

  • Out of 41 transporters, 10 showed low/no expression, while 23 were highly expressed in most tumors.
  • Expression patterns were largely similar between treated and untreated tumors.
  • Elevated expression of ABCC6/8/9 was observed in treated samples.
  • Real-time PCR confirmed microarray findings for 15 ABC transporter genes.

Conclusions:

  • The majority of ABC transporters are consistently expressed in breast tumors, irrespective of treatment status.
  • This widespread expression suggests a significant role for ABC transporters in breast cancer biology.
  • Further research is warranted to elucidate the specific functions of these transporters in tumor development and treatment response.
Keywords:
ABC transportercluster analysismicroarraymultidrug resistance

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