Role of BCRP as a biomarker for predicting resistance to 5-fluorouracil in breast cancer.

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Yuan J, Lv H, Peng B, Wang C, Yu Y, He Z

Role of BCRP as a biomarker for predicting resistance to 5-fluorouracil in breast cancer.

Cancer Chemother Pharmacol. 2009 May;63(6):1103-10. doi: 10.1007/s00280-008-0838-z. Epub 2008 Sep 27.

PubMed ID

18820913 [ View in PubMed

]

Abstract

PURPOSE: Chemotherapy is not only important but also necessary for the patient of breast cancer. Breast cancer resistance protein (BCRP), an atypical drug efflux pump, mediates multidrug resistance in breast cancer. The aim of this study is to search new substrate of BCRP. The result will guide the drug selection of chemotherapy in BCRP-positive breast cancer. METHODS: PA317/Tet-on/TRE-BCRP cell induced with doxycycline was used to screen the possible substrates of BCRP by MTT assay. The suspicious substrate [5-fluorouracil (5-Fu)] was further confirmed in PA317 and breast cancer cell MCF-7 by HLCP, apoptosis assay (staining and FACS) and RNAi technique. RESULTS: Mitoxantrone, 5-Fu, adriamycin, Methotrexate, Pirarubicin, and Etoposide were identified as substrates of BCRP. However, Paclitaxel, Vincristine, Vindesine, Mitomycin C, and cisplatin were not mediated by BCRP. 5-Fu was identified as substrate of BCRP for the first time. The further study showed that the intracellular retention dose of 5-Fu and the 5-Fu induced cellular apoptosis all decreased when BCRP highly expressed. Furthermore, 5-Fu accumulation and 5-Fu induced DNA damage increased when BCRP was silenced by RNAi in breast cancer cells. CONCLUSIONS: 5-Fluorouracil may be a specific substrate which can be bound by BCRP. BCRP can predict the sensitivity of breast cancer to 5-Fu. And BCRP-targeted therapy will reverse the resistance of breast cancer to 5-Fu.

DrugBank Data that Cites this Article

Drug Transporters

Drug	Transporter	Kind	Organism	Pharmacological Action	Actions
Fluorouracil	ATP-binding cassette sub-family G member 2	Protein	Humans	Unknown	Substrate	Details