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Cytotechnology 2018-Dec

Anti-breast cancer and anti-angiogenic potential of a lichen-derived small-molecule: barbatolic acid.

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Mehmet Varol

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Abstract

Natural products have been used for centuries as the most potent remedies to cure many diseases including cancer diseases. Angiogenesis is defined as the formation of new capillaries from existing vessels and plays a key role in the tumorigenesis process. Barbatolic acid is a little known lichen-derived small-molecule. In the present study, barbatolic acid was isolated from the acetone extract of Bryoria capillaris, and its anti-breast cancer and anti-angiogenic potential was investigated using human umbilical vein endothelial cells (HUVECs), human breast ductal carcinoma (T-47D) and cisplatin-resistant BRCA2-mutated human breast TNM stage IV adenocarcinoma (HCC1428) cells. AlamarBlue™ cell viability, lactate dehydrogenase cellular membrane degradation and PicoGreen™ dsDNA quantitation assays were performed to determine the cytotoxic potential of barbatolic acid. Anti-angiogenic and anti-migratory activities were investigated using endothelial tube formation assay and scratch wound healing assay, respectively. Half maximal inhibitory concentration of barbatolic acid was found to be higher than 100 µM for HUVEC, HCC1428 and T-47D cells. The sub-cytotoxic concentrations such as 25 µM, 50 µM and 100 µM were applied to determine anti-angiogenic and anti-migratory activities. Although the sub-cytotoxic concentrations inhibited endothelial tube formation and cellular migration in a concentration depended manner, barbatolic acid was more effective on the migration of HCC1428 and T-47D breast cancer cells than the migration of HUVECs. Consequently, the findings suggest that barbatolic acid is a promising anti-angiogenic and anti-migratory agent and the underlying activity mechanisms should be investigated by further in vitro and in vivo experiments.

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