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J Agric Food Chem. 2015 Jan 21;63(2):535-44. doi: 10.1021/jf504677r. Epub 2015 Jan 6.

Structure characterization of a novel polysaccharide from Dictyophora indusiata and its macrophage immunomodulatory activities.

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College of Light Industry and Food Sciences, South China University of Technology , Guangzhou, Guangdong 510640, People's Republic of China.


A novel polysaccharide, here named DP1, was isolated from the fruiting body of Dictyophora indusiata using a water extraction method. Structure characterization revealed that DP1 had an average molecular weight of 1132 kDa and consisted of glucose (56.2%), galactose (14.1%), and mannose (29.7%). The main linkage type of DP1 were proven to be (1 → 3)-linked α-l-Man, (1 → 2,6)-linked α-d-Glc, (1 → 6)-linked β-d-Glc, (1 → 6)-linked β-d-Gal, and (1 → 6)-linked β-d-Man by periodate oxidation-Smith degradation and nuclear magnetic resonance analysis. The immunostimulating assay indicated that DP1 could significantly promote macrophage NO, TNF-α, and IL-6 secretion in murine RAW 264.7 cells involving complement receptor 3 (CR3). The immune activities of DP1 were quite stable under thermal processing (100, 121, and 145 °C). Besides, DP1 retained stability after acidic/alkline treatment (pH 4.0-10.0), which enabled it to be an ideal complementary medicine or functional food for therapeutics of hypoimmunity and immunodeficiency diseases.


Dictyophora indusiata; complement receptor 3; immunostimulating; polysaccharide; structure characterization

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