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DNA Vector-based RNA Interference to Study Gene Function in Cancer
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DNA Vector-based RNA Interference to Study Gene Function in Cancer

Published on: June 4, 2012

Silencing the breast cancer resistance protein expression and function in caco-2 cells using lentiviral vector-based

Wei Zhang1, Jibin Li, Samantha M Allen

  • 1Absorption Systems, LP, 436 Creamery Way, Suite 600, Exton, PA 19341, USA.

Drug Metabolism and Disposition: the Biological Fate of Chemicals
|January 10, 2009
PubMed

Insights

Stable knockdown cell lines for breast cancer resistance protein (BCRP) were created using shRNA in Caco-2 cells. These engineered cells, particularly clone D, are valuable tools for studying drug transporters and their impact on pharmacokinetics and cancer drug resistance.

Area of Science:

  • Pharmacology
  • Molecular Biology
  • Cell Biology

Background:

  • Caco-2 cells are a human intestinal model crucial for studying drug absorption.
  • Breast cancer resistance protein (BCRP, ABCG2) and P-glycoprotein (P-gp, ABCB1) are key efflux transporters impacting drug pharmacokinetics.
  • BCRP overexpression in cancer can lead to chemotherapeutic drug resistance.

Purpose of the Study:

  • To engineer and characterize Caco-2 cell clones with stable knockdown of BCRP expression.
  • To develop a reliable cellular model for investigating BCRP's role in drug transport and resistance.
  • To facilitate the identification of BCRP substrates and inhibitors.

Main Methods:

  • Lentiviral vector-based short hairpin RNA (shRNA) was used to stably transduce Caco-2 cells.
  • BCRP expression was quantified using qPCR, Western blotting, and immunofluorescence microscopy.
  • Bidirectional transport assays with estrone-3-sulfate (E3S) and pheophorbide A (PhA) were performed.

Main Results:

  • Five stable BCRP knockdown Caco-2 cell clones were generated, with up to 97% mRNA silencing in clone D.
  • Gene silencing was stable for at least 25 passages, with significant protein reduction observed.
  • Knockdown resulted in a reduced efflux ratio for E3S and PhA, confirming functional BCRP inhibition.

Conclusions:

  • Engineered Caco-2 cell clones with stable BCRP knockdown provide a valuable tool for drug transport studies.
  • Clone D is particularly useful for P-gp substrate/inhibitor identification without BCRP interference.
  • These cell lines aid in understanding BCRP's role in drug absorption and cancer resistance.

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