TY - JOUR T1 - Breast Cancer Resistance Protein 1 Limits Fetal Distribution of Nitrofurantoin in the Pregnant Mouse JF - Drug Metabolism and Disposition JO - Drug Metab Dispos SP - 2154 LP - 2158 DO - 10.1124/dmd.107.018044 VL - 35 IS - 12 AU - Yi Zhang AU - Honggang Wang AU - Jashvant D. Unadkat AU - Qingcheng Mao Y1 - 2007/12/01 UR - http://dmd.aspetjournals.org/content/35/12/2154.abstract N2 - The efflux transporter, the breast cancer resistance protein (BCRP), is most abundantly expressed in the apical membrane of the placental syncytiotrophoblasts, indicating that it could play an important role in protecting the fetus by limiting xenobiotic/drug penetration across the placental barrier. In the present study, we examined whether Bcrp1, the murine homolog of human BCRP, limits fetal distribution of the model BCRP/Bcrp1 substrate, nitrofurantoin (NFT), in the pregnant mouse. NFT was administered i.v. to FVB wild-type and Bcrp1–/– pregnant mice. The maternal plasma samples and fetuses were collected at various times (5–60 min) after drug administration. The NFT concentrations in the maternal plasma samples and homogenates of fetal tissues were determined by a high-performance liquid chromatography/UV assay. Although the maternal plasma area under the concentration-time curve (AUC) of NFT in the Bcrp1–/– pregnant mice (97.4 ± 10.0 μg · min/ml plasma) was only slightly (but significantly) higher than that in the wild-type pregnant mice (78.4 ± 6.0 μg · min/ml plasma), the fetal AUC of NFT in the Bcrp1–/– pregnant mice (1493.0 ± 235.3 ng · min/g of fetus) was approximately 5 times greater than that in the wild-type pregnant mice (298.6 ± 77.4 ng · min/g of fetus). These results clearly suggest that Bcrp1 significantly limits fetal distribution of NFT in the pregnant mouse, but has only a minor effect on the systemic clearance of the drug. The American Society for Pharmacology and Experimental Therapeutics ER -