一种新番荔枝内酯单体atemoyacin-B克服肿瘤多药抗药性(英文)

Circumvention of tumor multidrug resistance by a new annonaceous acetogenin: atemoyacin-B

目的:探讨atemoyacin-B(Ate)克服肿瘤多药抗药性(MDR)作用及其机制,方法:Bullatacin(Bul)为阳性对照物,细胞毒测定以MTT法;P-gp功能测定以Fura 2-AM法;细胞内药物积累测定以荧光分光光度计法;细胞凋亡测定以流式细胞仪法,结果:Ate对MCF-7/Dox,MCF-7,KBvzoo和KB细胞的IC_(50)分别为122,120,1.34,1.27 nmol·L^(-1),Ate显著增加MDR细胞内Fura-2及多柔比星(Dox)的积累,但不增加相应敏感细胞的细胞内Fura-2及Dox的积累,Ate也能诱导MDR细胞凋亡.结论:MDR细胞对Ate同样敏感,不受抗药性影响,其机制与降低P-gp功能及增加细胞内药物积累有关。

AIM: To explore the effect of atemoyacin-B (Ate) on overcoming multidrug resistance ( MDR ). METHODS: Bullatacin (Bul) was used as a positive control. Cytotoxic effects of Bul and Ate were studied with cell culture of human MDR breast adenocarcinoma cells, MCF-7/Dox and human KBV200 cells, and their parental sensitive cell lines MCF-7 and KB. Cytotoxicity was determined by tetrazolium (MTT) assay. The function of P-glycoprotein (P-gp) was examined by Fura 2-AM assay. Cellular accumulation of doxorubicin (Dox) was determined by fluorescence spectrophotometry. Apoptosis was measured by flow cytometry. RESULTS: IC50 of Ate for MCF-7/Dox, MCF-7, KBV200, and KB cells were 122, 120, 1.34, and 1.27 nmol·L-1, respectively. IC50 of Bul for MCF-7/Dox, MCF-7, KBV200, and KB cells were 0.60, 0.59, 0.04, and 0.04 nmol·L-1, respectively. The cytotoxicities of Bul and Ate to MDR cells were similar to those to parental sensitive cells. Bul and Ate markedly increased cellular Fura-2 and Dox accumulation in MCF-7/Dox cells, but not in MCF-7 cells. The rates of apoptosis in MDR cells were similar to those in sensitive cells induced by Ate.