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Chen JJ , Patel A , Sodani K , Xiao ZJ , Tiwari AK , Zhang DM , Li YJ , Yang DH , Ye WC , Chen SD , Chen ZS
BBA, a Synthetic Derivative of 23-hydroxybutulinic Acid, Reverses Multidrug Resistance by Inhibiting the Efflux Activity of MRP7 (ABCC10)
PLoS One. 2013 Sep;8(9) :e74573
PMID: WOS:000324547300045    PMCID: PMC 3775757   
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Natural products are frequently used for adjuvant chemotherapy in cancer treatment. 23-O-(1,4'-bipiperidine-1-carbonyl) betulinic acid (BBA) is a synthetic derivative of 23-hydroxybutulinic acid (23-HBA), which is a natural pentacyclic triterpene and the major active constituent of the root of Pulsatilla chinensis. We previously reported that BBA could reverse P-glycoprotein (P-gp/ABCB1)-mediated multidrug resistance (MDR). In the present study, we investigated whether BBA has the potential to reverse multidrug resistance protein 7 (MRP7/ABCC10)-mediated MDR. We found that BBA concentration-dependently enhanced the sensitivity of MRP7-transfected HEK293 cells to paclitaxel, docetaxel and vinblastine. Accumulation and efflux experiments demonstrated that BBA increased the intracellular accumulation of [H-3]-paclitaxel by inhibiting the efflux of [H-3]-paclitaxel from HEK293/MRP7 cells. In addition, immunoblotting and immunofluorescence analyses indicated no significant alteration of MRP7 protein expression and localization in plasma membranes after treatment with BBA. These results demonstrate that BBA reverses MRP7-mediated MDR through blocking the drug efflux function of MRP7 without affecting the intracellular ATP levels. Our findings suggest that BBA has the potential to be used in combination with conventional chemotherapeutic agents to augment the response to chemotherapy.
Chen, Jun-Jiang Patel, Atish Sodani, Kamlesh Xiao, Zhi-Jie Tiwari, Amit K. Zhang, Dong-Mei Li, Ying-Jie Yang, Dong-Hua Ye, Wen-Cai Chen, Si-Dong Chen, Zhe-Sheng