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The chlorophyll-related compound pheophorbide a (Pa) was successively purified from anedible red seaweed, Grateloupia elliptica, using silica, octadecyl silica column chromatographyand reversed phase-high-performance liquid chromatography, as well as the cell cycleinhibitory and apoptotic effects of Pa being investigated in U87MG glioblastoma cells. The Paexhibited strong anticancer effects in the absence of direct photo-irradiation against variouscancer cell lines, including U87MG, SK-OV-3, and HeLa cells. Among the cancer cells, thestrongest anticancer activity of Pa exhibited on U87MG cells with IC50 values of 2.8 μg/ml. Inaddition, Pa specifically had cytostatic activity on glioblastoma cells rather than humanumbilical vein endothelial cells. Analysis of the cell cycle distribution showed that Pa inducedG0/G1 arrest of U87 MG cells. In addition, arrested cells induced late apoptosis and DNAdegradation under dark condition. These results suggest that Pa isolated from G. elliptica is apotential glioblastoma-specific anticancer agent without side effects on normal cells.

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