Breast cancer resistance protein BCRP (ABCG2)-mediated transepithelial nitrofurantoin secretion and its regulation in human intestinal epithelial (Caco-2) layers

被引:20
作者
Wright, Jamie A. [1 ]
Haslam, Lain S. [2 ]
Coleman, Tanya [2 ]
Simmons, Nicholas L. [1 ]
机构
[1] Newcastle Univ, Sch Med, Inst Cell & Mol Biosci, Epithelial Res Grp, Newcastle Upon Tyne NE2 4HH, Tyne & Wear, England
[2] Astra Zeneca Discovery DMPK, Macclesfield, Cheshire, England
基金
英国生物技术与生命科学研究理事会;
关键词
Nitrofurantoin; Intestinal secretion; Induction; beta-napthaflavone; Rosiglitazone; Caco-2; cells; BCRP; ARYL-HYDROCARBON RECEPTOR; MESSENGER-RNA EXPRESSION; ORAL BIOAVAILABILITY; ABC-TRANSPORTERS; SLC-TRANSPORTERS; DRUG ABSORPTION; P-GLYCOPROTEIN; CELLS; BCRP/ABCG2; EFFLUX;
D O I
10.1016/j.ejphar.2011.10.004
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
In order to determine the capacity and regulation of the breast cancer resistance protein (BCRP)-mediated transport in intact human intestinal epithelial monolayers (Caco-2) in which multiple ABC transporters are expressed, nitrofurantoin has been used as a selective transported substrate. Nitrofurantoin transepithelial secretion was confirmed in both human BCRP and mouse bcrp-transfected MDCKII epithelia, whereas no net transepithelial secretion was observed in native or human MDR1-MDCKII epithelia. Furthermore, nitrofurantoin transepithelial secretion by BCRP-MDCKII monolayers was inhibited by Ko143 (10 mu M), but not verapamil (100 mu M). In Caco-2 cells grown upon permeable supports, nitrofurantoin displayed a dose-dependent transepithelial secretion with an apparent Km = 69.41 +/- 22.3 mu M and Vmax = 14.03 +/- 2.27 nmol/(cm(2).h). Net nitrofurantoin transepithelial secretion by Caco-2 epithelia was inhibited 92% by 10 mu M Ko143. Regulation of expression and function of BCRP in Caco-2 epithelial monolayers was determined after 72-h pre-exposure of the monolayers to a number of potential inducing agents. Quantitative real-time PCR and Western blotting were used to correlate induction of BCRP transcript and protein levels with transport activity. 72-h pre-treatment with beta-napthoflavone and rosiglitazone up-regulates BCRP mRNA and protein expression and transport of nitrofurantoin. Ko143-sensitive transepithelial secretion of the bi-substrate (MDR1/BCRP) prazosin was also increased in the presence of rosiglitazone. We conclude that nitrofurantoin may be used to unambiguously measure BCRP-mediated fluxes in Caco-2 epithelial layers. Since dynamic regulation of BCRP expression and function is retained, the Caco-2 cell-line is useful as a screen for drug-drug and drug-diet interactions mediated by BCRP. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:70 / 76
页数:7
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