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Gene Research Center, Shanghai Medical College and Institutes of Biomedical Science of Fudan University, Shanghai, PR China.
Spores of Ganoderma lucidum contain a large amount of bioactive substances and have a higher bioactivity than the fruit bodies of G. lucidum. However, ingredients from spores are less studied due to the difficulties in collecting the spores and breaking the rigid shell. In this study, a water-soluble polysaccharide named GSG was extracted from the spores of G. lucidum. GSG is characterized to be a branched glucan that contains several different kinds of linkages. It was an effective inducer of MAPKs- and Syk-dependent TNF-alpha and IL-6 secretion in murine resident peritoneal macrophages. Dectin-1 could recognize GSG and partially mediate its biological activities. Additionally, in vivo administration of GSG potentiated the Con A-induced proliferative response of splenocytes and induced anti-tumor activity against Lewis lung cancer in mice. Therefore, these results suggest that GSG is an effective immunomodulator and may be a promising adjuvant remedy for anti-tumor therapies.
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