title: Carob fibre compounds modulate parameters of cell growth differently in human HT29 colon adenocarcinoma cells than in LT97 colon adenoma cells.
abstract: An extract of the Mediterranean carob (Ceratonia siliqua L.) pod (carob fibre extract), products formed after its fermentation by the gut flora and the major phenolic ingredient gallic acid (GA), were comparatively investigated for their influence on survival and growth parameters of colon adenocarcinoma HT29 cells and adenoma LT97 cells. Hydrogen peroxide (H2O2) formation in the cell culture media was quantified. After 1h 97+/-4 microM or 70+/-15 microM were found in HT29 medium and 6+/-1 microM or 3+/-3 microM in LT97 medium for carob fibre extract or GA, respectively. After 72 h carob fibre extract reduced survival of rapidly proliferating HT29 cells (by 76.4+/-12.9%) whereas metabolic activity and DNA-synthesis were only transiently impaired. Survival of slower growing LT97 cells was less decreased (by 21.5+/-12.9%), but there were marked effects on DNA-synthesis (reduction by 95.6+/-7%, 72 h). GA and fermented carob fibre did not have comparable effects. Thus, carob fibre extract resulted in H2O2 formation, which, however, could not explain impairment of cell growth. The differently modulated growth of human colon cell lines was more related to proliferation rates and impairment of DNA-synthesis than to H2O2 formation.
authors.affiliation: Friedrich-Schiller-University Jena, Department of Nutritional Toxicology, Institute of Nutrition, Dornburger Strasse 24, 07743 Jena, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Klenow
authors.forename: M
authors.initials: M
authors.lastname: Glei
authors.forename: B
authors.initials: B
authors.lastname: Haber
authors.forename: R
authors.initials: R
authors.lastname: Owen
authors.forename: B L
authors.initials: BL
authors.lastname: Pool-Zobel
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy / Q000473:pathology*; D000236:Adenoma / Q000188:drug therapy / Q000473:pathology*; D000972:Antineoplastic Agents, Phytogenic; D002455:Cell Division / Q000187:drug effects*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D002851:Chromatography, High Pressure Liquid; D003110:Colonic Neoplasms / Q000188:drug therapy / Q000473:pathology*; D003470:Culture Media; D004273:DNA, Neoplasm / Q000096:biosynthesis; D004043:Dietary Fiber / Q000494:pharmacology*; D007887:Fabaceae / Q000737:chemistry*; D005285:Fermentation; D019073:HT29 Cells; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000378:metabolism; D010636:Phenols; D021241:Spectrometry, Mass, Electrospray Ionization; D013454:Sulfoxides; D014992:Xylenes / Q000737:chemistry
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D003470:Culture Media; D004273:DNA, Neoplasm; D004043:Dietary Fiber; D010636:Phenols; D013454:Sulfoxides; D014992:Xylenes; D006861:Hydrogen Peroxide; C016833:xylenol orange