title: Phosphate group requirement for mitogenic activation of lymphocytes by an extracellular phosphopolysaccharide from Lactobacillus delbrueckii ssp. bulgaricus.
abstract: The mitogenic activity of extracellular polysaccharides produced by Lactobacillus delbrueckii ssp. bulgaricus OLL 1073R-1 and NCFB2483 was examined in murine lymphocytes. The extracellular polysaccharide from Lactobacillus delbrueckii ssp. bulgaricus OLL 1073R-1 was fractionated into neutral and acidic polysaccharides by anion-exchange chromatography, while that of Lactobacillus delbrueckii ssp. bulgaricus NCFB2483 were all fractionated into neutral polysaccharide(s). The acidic polysaccharide stimulated mitogenic responses of murine splenocytes and Peyer's patches but not of thymocytes. The optimal concentration of the acidic polysaccharide at the highest stimulation was 160 microg/ml. A significant increase of mitogenic activity was initiated at 24 h, and the highest response was obtained after stimulation for 48 h. The acidic polysaccharide purified by high performance liquid chromatography also had substantial mitogenic activity, and the molecular weight was estimated to be 1.2 x 10(6). The acidic polysaccharide was a phosphopolysaccharide consisting of glucose, galactose and phosphorus. Dephosphorylation by hydrofluoric acid degradation reduced the mitogenic activity in lymphocytes. The phosphopolysaccharide produced by Lactobacillus delbrueckii ssp. bulgaricus 1073R-1 is a potent B-cell-dependent mitogen in which the phosphate group acts as a trigger of the mitogenic induction.
authors.affiliation: Laboratory of Animal Products Chemistry, Graduate School of Agriculture, Tohoku University, Sendai, Japan. haruki@bios.tohoku.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Kitazawa
authors.forename: T
authors.initials: T
authors.lastname: Harata
authors.forename: J
authors.initials: J
authors.lastname: Uemura
authors.forename: T
authors.initials: T
authors.lastname: Saito
authors.forename: T
authors.initials: T
authors.lastname: Kaneko
authors.forename: T
authors.initials: T
authors.lastname: Itoh
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D007778:Lactobacillus / Q000737:chemistry / Q000378:metabolism*; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008934:Mitogens / Q000378:metabolism* / Q000502:physiology; D008970:Molecular Weight; D011134:Polysaccharides / Q000378:metabolism* / Q000502:physiology; D013047:Specific Pathogen-Free Organisms; D013403:Sugar Phosphates / Q000378:metabolism*; D013997:Time Factors
chemical_list: D008934:Mitogens; D011134:Polysaccharides; D013403:Sugar Phosphates