Abstract
Marine brown algae are rich in sulfated polysaccharides, which have the ability to form gels and viscous solution. Sulfated polysaccharides exhibit many biological activities; however, little is known whether the viscoelastic property in the polysaccharide extract is correlated with biological activities. We examined the immunomodulatory properties of highly viscous polysaccharide extract (HVPE) from Gagome Kjellmaniella crassifolia in a murine model, and the effects were compared with those of a less viscous polysaccharide extract (LVPE). HVPE or LVPE (10, 30, and 100 mg/kg/day) were orally administered to C57BL/6 mice for 14 days. Secretions of cytokine and IgA in Con A-stimulated spleen and Peyer’s patch (PP) cells and phagocytic activity of peritoneal macrophages was determined. IFN-γ, IL-12, IL-6, and IgA secretions showed high levels in spleen cell cultures from mice administered HVPE, whereas these effects were diminished in the LVPE-administered mice. The phagocytic activity of peritoneal macrophages was enhanced by the continuous oral administration of HVPE, and these effects were higher than those of LVPE. Furthermore, an increase in IgA secretion by administration of HVPE was observed in Con A-stimulated PP cells. These results suggest that the polysaccharide extract from K. crassifolia has immunomodulatory activities, which depend on the viscosity.
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Acknowledgement
This work was supported by a grant of the City Area Program and the Knowledge Cluster Initiative (Hakodate Marine Bio Industrial Cluster) of the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Katayama, S., Nishio, T., Kishimura, H. et al. Immunomodulatory Properties of Highly Viscous Polysaccharide Extract from the Gagome Alga (Kjellmaniella crassifolia). Plant Foods Hum Nutr 67, 76–81 (2012). https://doi.org/10.1007/s11130-011-0271-z
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DOI: https://doi.org/10.1007/s11130-011-0271-z