title: Lentinan has a stimulatory effect on innate and adaptive immunity against murine Listeria monocytogenes infection.
abstract: Lentinan, a (1-3)-beta glucan from Lentinus edodes, is licensed as an immunostimulatory drug. We tested the effect of lentinan in the well-established model system of the murine Listeria monocytogenes infection. Pre-treatment of bone marrow macrophages and dendritic cells with lentinan resulted in increased production of TNF-alpha and IL-12 after L. monocytogenes infection in vitro. After lentinan treatment bone marrow macrophages showed increased NO-production and enhanced cytotoxic activity against L. monocytogenes. Pre-treatment of mice with lentinan resulted in increased concentrations of TNF-alpha, IL-12 and IFN-gamma and also an increased number of L. monocytogenes specific CD8 T cells in the spleen. The bacterial burden in spleen and liver of mice was significantly reduced during primary and secondary Listeria infection after lentinan pre-treatment of mice. In summary these results show that lentinan enhances the protective CD8 T-cell response against L. monocytogenes probably by a mechanism that involves the IL-12-mediated augmentation of the specific antilisterial CD8 T-cell response.
authors.affiliation: Institut für Medizinische Mikrobiologie und Hygiene, Fakultät für klinische Medizin Mannheim der Universität Heidelberg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Kupfahl
authors.forename: G
authors.initials: G
authors.lastname: Geginat
authors.forename: H
authors.initials: H
authors.lastname: Hof
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000818:Animals; D017951:Antigen Presentation / Q000187:drug effects; D001854:Bone Marrow Cells / Q000276:immunology; D016827:CD8 Antigens / Q000276:immunology; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D016207:Cytokines / Q000096:biosynthesis; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D007109:Immunity / Q000187:drug effects* / Q000276:immunology; D007111:Immunity, Cellular / Q000187:drug effects / Q000276:immunology; D007912:Lentinan / Q000494:pharmacology*; D008088:Listeriosis / Q000276:immunology* / Q000382:microbiology; D008264:Macrophages / Q000187:drug effects / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D019001:Nitric Oxide Synthase / Q000378:metabolism; D010587:Phagocytosis / Q000187:drug effects; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D016827:CD8 Antigens; D016207:Cytokines; D007912:Lentinan; D019001:Nitric Oxide Synthase