Pharmaceutical Research

, Volume 21, Issue 10, pp 1895–1903

Functional Analysis of SNPs Variants of BCRP/ABCG2

  • Chihiro Kondo
  • Hiroshi Suzuki
  • Masaya Itoda
  • Shogo Ozawa
  • Jun-ichi Sawada
  • Daisuke Kobayashi
  • Ichiro Ieiri
  • Kazunori Mine
  • Kenji Ohtsubo
  • Yuichi Sugiyama
Article

DOI: 10.1023/B:PHAM.0000045245.21637.d4

Cite this article as:
Kondo, C., Suzuki, H., Itoda, M. et al. Pharm Res (2004) 21: 1895. doi:10.1023/B:PHAM.0000045245.21637.d4

Abstract

Purpose. The aim of the current study was to identify the effect of single nucleotide polymorphisms (SNPs) in breast cancer resistance protein (BCRP/ABCG2) on its localization, expression level, and transport activity.

Methods. The cellular localization was identified using the wild type and seven different SNP variants of BCRP (V12M, Q141K, A149P, R163K, Q166E, P269S, and S441N BCRP) after transfection of their cDNAs in plasmid vector to LLC-PK1 cells. Their expression levels and transport activities were determined using the membrane vesicles from HEK293 cells infected with the recombinant adenoviruses containing these kinds of BCRP cDNAs.

Results. Wild type and six different SNP variants of BCRP other than S441N BCRP were expressed on the apical membrane, whereas S441N BCRP showed intracellular localization. The expression levels of Q141K and S441N BCRP proteins were significantly lower compared with the wild type and the other five variants. Furthermore, the transport activity of E1S, DHEAS, MTX, and PAH normalized by the expression level of BCRP protein was almost the same for the wild type, V12M, Q141K, A149P, R163K, Q166E, and P269S BCRP.

Conclusions. These results suggest that Q141K SNPs may associate with a lower expression level, and S441N SNPs may affect both the expression level and cellular localization. It is possible that subjects with these polymorphisms may have lower expression level of BCRP protein and, consequently, a reduced ability to export these substrates.

adenovirus BCRP/ABCG2 interindividual difference SNPs 

Copyright information

© Springer Science+Business Media, Inc. 2004

Authors and Affiliations

  • Chihiro Kondo
    • 1
  • Hiroshi Suzuki
    • 2
  • Masaya Itoda
    • 3
  • Shogo Ozawa
    • 3
  • Jun-ichi Sawada
    • 3
  • Daisuke Kobayashi
    • 4
  • Ichiro Ieiri
    • 5
  • Kazunori Mine
    • 4
  • Kenji Ohtsubo
    • 5
  • Yuichi Sugiyama
    • 1
  1. 1.School of Pharmaceutical SciencesThe University of TokyoTokyoJapan
  2. 2.Department of Pharmacy, Tokyo University HospitalThe University of TokyoTokyoJapan
  3. 3.National Institute of Health SciencesTokyoJapan
  4. 4.School of Pharmaceutical SciencesKyushu UniversityFukuokaJapan
  5. 5.Department of Hospital Pharmacy, Faculty of MedicineTottori UniversityJapan

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