title: Conformation dependency of nitric oxide synthesis of murine peritoneal macrophages by beta-glucans in vitro.
abstract: We have already demonstrated that various activities including NO (nitric oxide) synthesis in vivo were significantly different between triple helical (SPG) and single helical (alkaline-treated SPG, SPG-OH) beta-glucans, and beta-glucan-mediated NO synthesis was associated with increased gene of IFN-gamma. In this study, we analyzed beta-glucan-mediated NO production in vitro with the concomitant use of IFN-gamma. Proteose peptone-elicited peritoneal macrophages (PM) were collected from male C3H/HeJ mice and cultured with beta-glucans in the presence or absence of IFN-gamma for 24 h. It was found that SPG-OH, but not SPG, enhanced NO synthesis in vitro, especially in the presence of IFN-gamma. Concentrations of interleukin-1 alpha, -6 and TNF-alpha in the culture supernatant of SPG-OH were significantly higher than those in that SPG. Membrane-associated IL-1 alpha was also high with SPG-OH. Cytokine productivity of PMs, as well as NO synthesis, was elevated in the presence of IFN-gamma. These facts intensely suggest that the single helical conformer of beta-glucan (SPG-OH) is dominant in cytokine production and subsequent NO synthesis.
authors.affiliation: Laboratory of Immunopharmacology of Microbial Products, Tokyo University of Pharmacy and Life Science, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Ohno
authors.forename: T
authors.initials: T
authors.lastname: Hashimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Adachi
authors.forename: T
authors.initials: T
authors.lastname: Yadomae
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004797:Enzyme-Linked Immunosorbent Assay; D005936:Glucans / Q000737:chemistry* / Q000494:pharmacology*; D007371:Interferon-gamma / Q000494:pharmacology; D007375:Interleukin-1 / Q000032:analysis / Q000276:immunology; D015850:Interleukin-6 / Q000032:analysis / Q000276:immunology; D017737:Macrophages, Peritoneal / Q000187:drug effects* / Q000378:metabolism*; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D008968:Molecular Conformation; D009569:Nitric Oxide / Q000096:biosynthesis* / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis / Q000276:immunology
chemical_list: D005936:Glucans; D007375:Interleukin-1; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D009569:Nitric Oxide; D007371:Interferon-gamma