@article{APS7693,
author = {Li-wu Fu and Qi-chao Pan and Yong-ju Liang and Hong-bing Huang},
title = {Circumvention of tumor multidrug resistance by a new annonaceous acetogenin: atemoyacin-B},
journal = {Acta Pharmacologica Sinica},
volume = {20},
number = {5},
year = {2016},
keywords = {},
abstract = {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.},
issn = {1745-7254}, url = {http://www.chinaphar.com/article/view/7693}
}