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Effect of the microbial lipopeptide on tumor
cell lines: apoptosis induced by disturbing the fatty acid composition
of cell membrane |
| Xiangyang Liu1,Xinyi Tao2,Aihua Zou2,Shizhong Yang2,Bozhong Mu2,Lixin Zhang3, |
| 1.State Key Laboratory
of Bioreactor Engineering and Institute of Applied Chemistry, East
China University of Science and Technology, Shanghai 200237, China;Institute of Microbiology,
Chinese Academy of Sciences, Beijing 100190, China; 2.State Key Laboratory
of Bioreactor Engineering and Institute of Applied Chemistry, East
China University of Science and Technology, Shanghai 200237, China; 3.Institute of Microbiology,
Chinese Academy of Sciences, Beijing 100190, China; |
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Abstract Microbial lipopeptides play an important role in apoptosis induction of tumor cells. However, there is little knowledge about the relationship between apoptosis induction and membrane fatty acids. The present study focused on the effects of lipopeptides produced by Bacillus subtilis HSO121 on Bcap-37 cell lines. 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyl (MTT) colorimetric assay and surface tension measurements, showed that the critical micelle concentration (CMC) was a critical level for the inhibitory activity of lipopeptides on the growth of Bcap-37 cells. Under the CMC, the order of least to greatest cytotoxicity effect on cancer cell lines by lipopeptides is C13-lipopeptide<C14-lipopepitde<C15-lipopeptide. Above CMC, all lipopeptides directly exert cytolytic activity. The flow cytometric analysis and Hoechst33258 staining experiments confirmed the apoptosis of Bcap-37 cell lines induced by lipopeptides in a dose-dependent manner. This apoptosis was associated with a significant decrease of the unsaturated degree of the cellular fatty acids of Bcap-37 cell lines due to the changes in the cellular fatty acids composition induced by the lipopeptide treatment. These results indicated that disturbance of the cellular fatty acid composition of breast cancer cell lines were related to in the cell apoptosis. Furthermore, significant difference in IC50 values of tumor cells and normal cell showed that the lipopeptide exerted selective cytotoxicity on the cancer cells. Thus HSO121 lipopeptides may have potential applications as an anticancer leads.
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| Keywords
Bacillus subtilis
lipopeptide
antitumor activity
membrane fatty acid
apoptosis
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Issue Date: 01 June 2010
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