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http://dx.doi.org/10.7314/APJCP.2014.15.2.617

Apoptosis-Inducing Activity of HPLC Fraction from Voacanga globosa (Blanco) Merr. on the Human Colon Carcinoma Cell Line, HCT116  

Acebedo, Alvin Resultay (Mammalian Cell Culture Laboratory, Institute of Biology, College of Science, University of the Philippines)
Amor, Evangeline Cancio (Institute of Chemistry, College of Science, University of the Philippines)
Jacinto, Sonia Donaldo (Mammalian Cell Culture Laboratory, Institute of Biology, College of Science, University of the Philippines)
Publication Information
Asian Pacific Journal of Cancer Prevention / v.15, no.2, 2014 , pp. 617-622 More about this Journal
Abstract
Voacanga globosa (Blanco), a plant endemic to the Philippines, is traditionally used especially by indigenous people of Bataan in the treatment of ulcers, wounds and tumorous growths. This study aimed to provide scientific evidence to therapeutic properties by determining cytotoxic and pro-apoptotic activity of HPLC fractions from leaves on HCT116 human colon carcinoma and A549 human lung carcinoma cell lines. Ethanolic extraction was performed on V globosa leaves followed by hexane and ethyl acetate partitioning. Silica gel column chromatography and high performance liquid chromatography (HPLC) produced MP1, MP2 and MP3 fractions. Cytotoxic activity of the fractions was determined through MTT assay against the cancer cell lines HCT116 and A549 and the non-cancer AA8 Chinese hamster ovarian cell line. Pro-apoptotic activities of the most active fractions were further assessed through DAPI staining, TUNEL assay and JC-1 mitochondrial membrane potential assay with HCT116 cells. While the MPI fraction exerted no significant activity against all cell lines tested, MP2 and MP3 fractions demonstrated high toxicity against HCT116 and A549 cells. The MP3 fraction induced formation of apoptotic bodies, condensed DNA and other morphological changes consistent with apoptosis of HCT116 cells and TUNEL assay showed significant increase in DNA fragmentation over time. In these cells, the MP3 fraction also induced mitochondrial membrane destabilization, which is generally associated with the beginning of apoptosis. Phytochemical analysis demonstrated the presence only of saponins and terpenoids in the MP3 fraction. The results indicate that the MP3 fraction exerts cytotoxic activity on HCT116 cells via induction of apoptosis triggered by loss of mitochondrial membrane potential crucial for cell survival.
Keywords
Voacanga globosa; cancer cell lines; cytotoxicity; apoptosis; saponins; terpenoids;
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