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[Cancer Research 61, 3458-3464, April 15, 2001]
© 2001 American Association for Cancer Research


Tumor Biology

Subcellular Localization and Distribution of the Breast Cancer Resistance Protein Transporter in Normal Human Tissues1

Marc Maliepaard2, George L. Scheffer2, Ian F. Faneyte, Margôt A. van Gastelen, Adriana C. L. M. Pijnenborg, Alfred H. Schinkel, Marc J. van de Vijver, Rik J. Scheper and Jan H. M. Schellens3

Divisions of Experimental Therapy [M. M., M. A. v. G., A. H. S., J. H. M. S.], Medical Oncology [J. H. M. S.], and Pathology [I. F. F., M. J. v. d. V.], The Netherlands Cancer Institute, 1066 CX Amsterdam; and Department of Pathology, Free University Hospital, 1081 HV Amsterdam [G. L. S., A. C. L. M. P., R. J. S.], the Netherlands

High expression of the Breast Cancer Resistance Protein (BCRP) gene has been shown to be involved in resistance to chemotherapeutic drugs. Knowledge of the localization of BCRP protein in normal tissues may help unravel the normal function of this protein. Therefore, we characterized the tissue distribution and cellular localization of BCRP in frozen sections of normal human tissues. For this purpose, we used the recently described monoclonal antibody BXP-34 and another independently developed monoclonal antibody directed against BCRP, BXP-21. Both monoclonal antibodies show specific BCRP plasma membrane staining on cytospins obtained from topotecan- or mitoxantrone-selected cell lines, as well as from BCRP-transfected cell lines. Immunoprecipitation experiments using either BXP-21 or BXP-34 yielded a clear Mr 72,000 BCRP band from BCRP-overexpressing tumor cells. In the topotecan-selected T8 and mitoxantrone-selected MX3 tumor cell lines, BCRP turned out to be differentially glycosylated. In contrast to BXP-34, BXP-21 is able to detect the Mr 72,000 BCRP protein on immunoblots and is reactive with BCRP in formalin-fixed, paraffin-embedded tissues.

Using BXP-21 and BXP-34, prominent staining of BCRP was observed in placental syncytiotrophoblasts, in the epithelium of the small intestine and colon, in the liver canalicular membrane, and in ducts and lobules of the breast. Furthermore, BCRP was present in veinous and capillary endothelium, but not in arterial endothelium in all of the tissues investigated. In the tissues studied, the mRNA levels of BCRP were assessed using reverse transcription-PCR, and these corresponded with the levels of BCRP protein estimated from immunohistochemical staining. The presence of BCRP at the placental syncytiotrophoblasts is consistent with the hypothesis of a protective role of BCRP for the fetus. The apical localization in the epithelium of the small intestine and colon indicates a possible role of BCRP in the regulation of the uptake of p.o. administered BCRP substrates by back-transport of substrate drugs entering from the gut lumen. Therefore, it may be useful to attempt to modulate the uptake of p.o. delivered BCRP substrates, e.g., topotecan or irinotecan, by using a BCRP inhibitor. Clinical trials testing this hypothesis have been initiated in our institute.




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A. Swiatecka-Urban, A. Brown, S. Moreau-Marquis, J. Renuka, B. Coutermarsh, R. Barnaby, K. H. Karlson, T. R. Flotte, M. Fukuda, G. M. Langford, et al.
The Short Apical Membrane Half-life of Rescued {Delta}F508-Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) Results from Accelerated Endocytosis of {Delta}F508-CFTR in Polarized Human Airway Epithelial Cells
J. Biol. Chem., November 4, 2005; 280(44): 36762 - 36772.
[Abstract] [Full Text]