title: Bioactive responses of Hep-G2 cells to soyasaponin extracts differs with respect to extraction conditions.
abstract: Soyasaponins are bioactive oleanane triterpenoids found in soy and other legumes. The effect of two methanolic extractions of soy flour, room temperature (RT) and reflux (RE) extractions on composition and bioactive properties in hepatocarcinoma cells (Hep-G2) were investigated. A greater amount of 2,3-dihydro-2,5-dihydroxy-6-methyl-4H-pyran-4-one (DDMP) conjugated soyasaponins betag was measured in RT and a greater amount of the structurally related non-DDMP soyasaponins I and III were detected in RE. MTT cell viability yielded an LC50 of 0.926+/-0.08 mg/mL for RT and 0.546+/-0.06 mg/mL for RE. ViaCount viability assay showed similar results for RE as the MTT assay however, RT treatment produced no difference compared with the control. Analysis using TUNEL and cell cycle analysis revealed that RE treatment induced apoptosis and flow cytometry forward side scatter and morphological assessment of RT showed evidence of Hep-G2 differentiation after 72 h. Differences in the bioactivities may be attributed to the different concentration of DDMP conjugated soyasaponin betag recovered in RT and RE extracts.
authors.affiliation: Department of Chemistry, National University of Singapore, Singapore.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Mei Ching
authors.initials: MC
authors.lastname: Yeo
authors.forename: Fang Yin
authors.initials: FY
authors.lastname: Tang
authors.forename: David G
authors.initials: DG
authors.lastname: Popovich
mesh_terms: D000970:Antineoplastic Agents / Q000032:analysis / Q000494:pharmacology*; D006528:Carcinoma, Hepatocellular / Q000188:drug therapy* / Q000473:pathology; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D002851:Chromatography, High Pressure Liquid; D004354:Drug Screening Assays, Antitumor; D022781:Hepatocytes / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D006801:Humans; D008113:Liver Neoplasms / Q000188:drug therapy* / Q000473:pathology; D009828:Oleanolic Acid / Q000031:analogs & derivatives / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D012503:Saponins / Q000032:analysis / Q000737:chemistry / Q000494:pharmacology*; D030262:Soybean Proteins / Q000032:analysis; D021241:Spectrometry, Mass, Electrospray Ionization; D013778:Tetrazolium Salts / Q000378:metabolism; D013844:Thiazoles / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D010936:Plant Extracts; D012503:Saponins; D030262:Soybean Proteins; D013778:Tetrazolium Salts; D013844:Thiazoles; C089346:soyasaponin beta g; C056684:soyasaponin I; C106126:soyasaponin II; D009828:Oleanolic Acid; C022616:thiazolyl blue