title: Antiproliferative crude soy saponin extract modulates the expression of IkappaBalpha, protein kinase C, and cyclooxygenase-2 in human colon cancer cells.
abstract: Frequent consumption of soy and soy-based products is associated with reduced cancer incidence particularly for breast, colon, and prostate cancer. In this study, we examined the effect of crude soy saponin extract on PMA (phorbol 12-myristate 13-acetate)-induced inflammatory responses. Human adenocarcinoma cells (HT-29) were treated with various concentrations of saponin extract for 72 h. Cell growth was measured at 24, 48 and 72 h of incubation, and the PMA-induced expressions of cyclooxygenase-2 (COX-2), protein kinase C (PKC), and IkappaBalpha were determined. The results indicate that crude saponin extract decreased cell growth in a dose- and time-dependent manner. Crude soy saponin extract suppressed the degradation of IkappaBalpha in PMA-stimulated cells, while COX-2 and PKC expressions were significantly down-regulated. These findings support the hypothesis that the soy saponins reduce the risk of colon tumorigenesis possibly by suppressing inflammatory responses.
authors.affiliation: Department of Food and Nutrition, Sookmyung Women's University, 53-12 Chungpa-Dong, 2-ka, Yongsan-ku, Seoul 140-742, South Korea.
authors.forename: Hwa-Young
authors.initials: HY
authors.lastname: Kim
authors.forename: Rina
authors.initials: R
authors.lastname: Yu
authors.forename: Jeong-Sang
authors.initials: JS
authors.lastname: Kim
authors.forename: Young-Kyoon
authors.initials: YK
authors.lastname: Kim
authors.forename: Mi-Kyung
authors.initials: MK
authors.lastname: Sung
mesh_terms: D015153:Blotting, Western; D002455:Cell Division / Q000187:drug effects; D003110:Colonic Neoplasms / Q000188:drug therapy / Q000201:enzymology / Q000517:prevention & control*; D051546:Cyclooxygenase 2; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D020672:I-kappa B Proteins / Q000378:metabolism*; D007527:Isoenzymes / Q000378:metabolism*; D008565:Membrane Proteins; D000072000:NF-KappaB Inhibitor alpha; D010936:Plant Extracts / Q000737:chemistry; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism*; D011493:Protein Kinase C / Q000378:metabolism*; D012503:Saponins / Q000494:pharmacology*; D013025:Glycine max / Q000737:chemistry*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D020672:I-kappa B Proteins; D007527:Isoenzymes; D008565:Membrane Proteins; C000606204:NFKBIA protein, human; D010936:Plant Extracts; D012503:Saponins; D000072000:NF-KappaB Inhibitor alpha; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate