Abstract
Purpose
Microtubules play a central role in various fundamental cell functions and thus become an attractive target for cancer therapy. A novel compound YSL-12 is a combretastatin A-4 (CA-4) analogue with more stability. We investigated its anti-tumor activity and mechanisms in vitro and in vivo for the first time.
Methods
Cytotoxicity was evaluated by MTT method. In vitro microtubule polymerization assay was performed using a fluorescence-based method by multifunction fluorescence microplate reader. Intracellular microtubule network was detected by immunofluorescence method. Cell cycle analysis and apoptosis were measured by flow cytometry. Metabolic stability was recorded by liquid chromatography–ultraviolet detection and liquid chromatography–mass spectrometry. In vivo anti-tumor activity was assessed using HT-29 colon carcinoma xenografts established in BALB/c nude mice.
Results
YSL-12 displayed nanomolar-level cytotoxicity against various human cancer cell lines. A high selectivity toward normal cells and potent activity toward drug-resistant cells were also observed. YSL-12 was identified as tubulin polymerization inhibitor evidenced by effectively inhibits tubulin polymerization and heavily disrupted microtubule networks in living HT-29 cells. YSL-12 displayed potent disruption effect of pre-established tumor vasculature in vitro. In addition, YSL-12 treatment also caused cell cycle arrest in the G2/M phase and induced cell apoptosis in a dose-dependent manner. In vitro metabolic stability study revealed YSL-12 displayed considerable better stability than CA-4 in liver microsomes. In vivo, YSL-12 delayed tumor growth with 69.4 % growth inhibition.
Conclusions
YSL-12 is a promising microtubule inhibitor that has great potential for the treatment of colon carcinoma in vitro and in vivo and worth being a candidate for further development of cancer therapy.
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Acknowledgments
This work was supported by grants from National Natural Science Foundation of China (81273518), the financial science and technology special competitive allocation project of Zhanjiang city (2014A01021, 2015A01025) and the Characteristic innovation Program for College of Education Department of Guangdong Province (2014KTSCX084).
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De Cai and Zhiqing Qiu have contributed equally to this work.
Liming Xie and Zhixiu Lin are co-corresponding authors.
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Cai, D., Qiu, Z., Yao, W. et al. YSL-12, a novel microtubule-destabilizing agent, exerts potent anti-tumor activity against colon cancer in vitro and in vivo. Cancer Chemother Pharmacol 77, 1217–1229 (2016). https://doi.org/10.1007/s00280-016-3036-4
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DOI: https://doi.org/10.1007/s00280-016-3036-4