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International Journal of Medicinal Mushrooms
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ISSN Imprimer: 1521-9437
ISSN En ligne: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushr.v4.i2.30
16 pages

Th1-Oriented Immunomodulating Activity of Gel-Forming Fungal (1®3)-Beta-Glucans

Naohito Ohno
Laboratory for Immunopharmacology of Microbial Products, Tokyo University of Pharmacy and Life Science, Tokyo, Japan
Takafumi Jinushi
Laboratory of Immunopharmacology of Microbial Products, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
Toshiro Yadomae
Laboratory of Immunopharmacology of Microbial Products, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan

RÉSUMÉ

The immunomodulating effects of various gel-forming (1®3)-beta-glucans on balancing helper T-cell activity were examined in a murine model. Plasma from mice injected with grifolan (GRN) from the edible and medicinal mushroom Grifola frondosa (Dicks.: Fr.) S. F. Gray [or alkaline-treated sonifilan (SPG-OH)] and trinitrophenyl ovalbumin (TNP-OVA) contained TNP-specific antibodies of both IgG1 (Th2-mediated) and IgG2a (Th1-mediated) isotypes. Administration of glucan (SSG) from Sclerotinia sclerotiorum (Lib.) de Bary IFO 9395 and TNP-OVA significantly augmented the synthesis of IgG2a antibodies, while the synthesis of IgG1 was reduced. Furthermore, intracellular cytokine staining showed a higher proportion of IFN-g-producing helper T cells in SSG-administered murine splenocytes. The highest IFN-g production was observed when adherent cells of mice administered TNP-OVA and SSG were cultured with TNP-primed lymphocytes. This effect of administration of SSG on IFN-g production was completely inhibited by addition of anti-IL-12 mAb. The content of the reduced form of glutathione in splenocytes was increased by SSG administration, suggesting type 1 immunoresponse. Depletion of lymphoid dendritic cell population from SSG-administered splenocytes reduced IFN-g production. In conclusion, our study showed that beta-glucans have various effects on the Th1- or Th2-dependent antibody subclasses and, in particular, that SSG induces the development of Th1 cells via the IL-12 pathway.


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