一种新番荔枝内酯单体atemoyacin—B克服肿瘤多药抗药性

目的 探讨ａｔｅｍｏｙａｃｉｎ－Ｂ（Ａｔｅ）克服肿瘤多药抗药性（ＭＤＲ）作用及机制。方法 Ｂｕｌｌａｔａｃｉｎ（Ｂｕｌ）为阳性对照物，细胞毒测定以ＭＴＴ法，Ｐｇｐ功能测定以Ｆｕｒａ２－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，ＫＢＶ２００和ＫＢ细胞的ＩＣ５０分别为１２２，１２０，１．３４，１．２７ｍｍｏｌ．Ｌ＾－１，Ａｔ

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

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. CONCLUSION: There was no cross-resistance of P-gp positive MCF-7/Dox and KBv200 cell lines to Bul and Ate as compared with their sensitive P-gp negative MCF-7 and KB cell lines. The mechanism of the circumvention of MDR was associated with the decrease of P-gp function and the increase of cellular drug accumulation in MDR cells.