Title : Role of breast cancer resistance protein in the bioavailability and fetal penetration of topotecan.

Pub. Date : 2000 Oct 18

PMID : 11036110






6 Functional Relationships(s)
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1 BCRP can render tumor cells resistant to the anticancer drugs topotecan, mitoxantrone, doxorubicin, and daunorubicin. Topotecan ATP binding cassette subfamily G member 2 (Junior blood group) Mus musculus
2 Bcrp1, the murine homologue of BCRP, was expressed in the polarized mammalian cell lines LLC-PK1 and MDCK-II, and the direction of Bcrp1-mediated transport of topotecan and mitoxantrone was determined. Topotecan ATP binding cassette subfamily G member 2 (Junior blood group) Mus musculus
3 Bcrp1, the murine homologue of BCRP, was expressed in the polarized mammalian cell lines LLC-PK1 and MDCK-II, and the direction of Bcrp1-mediated transport of topotecan and mitoxantrone was determined. Topotecan ATP binding cassette subfamily G member 2 (Junior blood group) Mus musculus
4 To avoid the confounding drug transport provided by P-glycoprotein (P-gp), the roles of Bcrp1 in the bioavailability of topotecan and the effect of GF120918 were studied in both wild-type and P-gp-deficient mice and their fetuses. Topotecan ATP binding cassette subfamily G member 2 (Junior blood group) Mus musculus
5 In pregnant GF120918-treated, P-gp-deficient mice, relative fetal penetration of topotecan was twofold higher than that in pregnant vehicle-treated mice, suggesting a function for BCRP in the maternal-fetal barrier of the placenta. Topotecan ATP binding cassette subfamily G member 2 (Junior blood group) Mus musculus
6 We propose that strategic application of BCRP inhibitors may thus lead to more effective oral chemotherapy with topotecan or other BCRP substrate drugs. Topotecan ATP binding cassette subfamily G member 2 (Junior blood group) Mus musculus