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Research ArticleArticle

Closing the Gaps: A Full Scan of the Intestinal Expression of P-Glycoprotein, Breast Cancer Resistance Protein, and Multidrug Resistance-Associated Protein 2 in Male and Female Rats

Caroline MacLean, Ulla Moenning, Andreas Reichel and Gert Fricker
Drug Metabolism and Disposition July 2008, 36 (7) 1249-1254; DOI: https://doi.org/10.1124/dmd.108.020859
Caroline MacLean
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Ulla Moenning
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Andreas Reichel
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Gert Fricker
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Abstract

Intestinal ATP binding cassette (ABC) transporters may affect the bioavailability and effectiveness of orally administered drugs. Available studies on regional expression of intestinal efflux transporters were done with selected intestinal segments only and inconsistent with regard to the variability of transporter expression and the course of expression along the intestine. For an evaluation of the consistency between mRNA and protein expression, relative expression levels of P-glycoprotein (Pgp; ABCB1), breast cancer resistance protein (Bcrp; ABCG2), and multidrug resistance-associated protein (Mrp) 2 (ABCC2) were determined using quantitative real-time-polymerase chain reaction and Western blot in rat intestinal segments from duodenum, jejunum, ileum, and colon. In addition, the protein expression of Pgp, Bcrp, and Mrp2 from the entire rat intestine was studied by a complete 3-cm segmentation to evaluate the predictive power of expression analyses from selected intestinal segments. Pgp showed an increase from proximal to distal regions, Bcrp showed an arcuate pattern with highest expression toward the end of small intestine, and Mrp2 decreased along the intestinal axis from proximal to distal parts. No gender specific differences could be observed. Regarding the concordance of mRNA and protein expression, Pgp and Bcrp mRNA samples allow good estimations about the corresponding protein expression (for Pgp limited to the mdr1a isoform), but for Mrp2, pronounced deviation could be observed. All transporters showed considerable intra- and interindividual variability, especially at the protein level, making it problematic to take transporter expressions of small sections exemplary for general assumptions on intestinal abundances.

Footnotes

  • This study was supported by Bayer Schering Pharma AG, Berlin, Germany. Part of this work has been presented as a poster at the International Research Conference “BioMedical Transporters 2007” in Bern, Switzerland.

  • Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.

  • doi:10.1124/dmd.108.020859.

  • ABBREVIATIONS: ABC, ATP binding cassette; Pgp, p-glycoprotein; Mrp, multidrug resistance-associated protein; Bcrp, breast cancer resistance protein; P450, cytochrome P450; PCR, polymerase chain reaction; GI, gastrointestinal; TBS-T, Tris-buffered saline/Tween 20.

    • Received February 6, 2008.
    • Accepted March 28, 2008.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 36 (7)
Drug Metabolism and Disposition
Vol. 36, Issue 7
1 Jul 2008
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Research ArticleArticle

Closing the Gaps: A Full Scan of the Intestinal Expression of P-Glycoprotein, Breast Cancer Resistance Protein, and Multidrug Resistance-Associated Protein 2 in Male and Female Rats

Caroline MacLean, Ulla Moenning, Andreas Reichel and Gert Fricker
Drug Metabolism and Disposition July 1, 2008, 36 (7) 1249-1254; DOI: https://doi.org/10.1124/dmd.108.020859

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Research ArticleArticle

Closing the Gaps: A Full Scan of the Intestinal Expression of P-Glycoprotein, Breast Cancer Resistance Protein, and Multidrug Resistance-Associated Protein 2 in Male and Female Rats

Caroline MacLean, Ulla Moenning, Andreas Reichel and Gert Fricker
Drug Metabolism and Disposition July 1, 2008, 36 (7) 1249-1254; DOI: https://doi.org/10.1124/dmd.108.020859
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