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Rubinoboletus ballouii polysaccharides exhibited immunostimulatory activities through toll‐like receptor‐4 via NF‐κB pathway
Author(s) -
Li LongFei,
Yue Grace G.L.,
Chan Ben C.L.,
Zeng Qiang,
Han QuanBin,
Leung PingChung,
Fung KwokPui,
Liu JiKai,
Lau Clara B.S.
Publication year - 2021
Publication title -
phytotherapy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.019
H-Index - 129
eISSN - 1099-1573
pISSN - 0951-418X
DOI - 10.1002/ptr.6958
Subject(s) - mannose receptor , cd11c , toll like receptor , cd14 , chemistry , mannose , receptor , immune system , splenocyte , biology , biochemistry , microbiology and biotechnology , in vitro , innate immune system , immunology , macrophage , gene , phenotype
The biological activities of water‐soluble components of edible mushroom Rubinoboletus ballouii (RB) were seldom reported. Polysaccharides of RB (RBP) were prepared and well‐characterized using chemical analyses. The immunomodulatory properties of RBP were investigated using human monocyte‐derived dendritic cells (moDC) in vitro , and cyclophosphamide (CTX)‐induced immunosuppressive mouse model. Results showed that RBP was found to contain 80.6% (w/w) of neutral sugars including D ‐fucose, D ‐mannose, D ‐glucose and D ‐galactose (1.7:1.4:1.0:1.8), and 12.5% (w/w) of proteins, which composed of glutamine, threonine, serine, etc. RBP could promote the maturation of moDC and increase the secretion of IL‐12p40, IL‐10, and TNF‐α. Furthermore, the stimulation of IL‐12p40 production was inhibited by pretreatment with toll‐like receptor (TLR)‐4 blocker or NF‐κB pathway blocker, suggesting that the activation of moDC by RBP was mediated through NF‐κB pathway via TLR‐4 receptor. On the other hand, in CTX‐treated mice, RBP restored the loss of CD34 bright CD45 dim hematopoietic stem cells and increased IL‐2 production in sera and splenocytes culture supernatant, as well as up‐regulated the percentage of CD4 + T helper lymphocyte in mice splenocytes. These findings strongly suggested that RBP are the active ingredients of RB responsible for its immunostimulatory actions and deserved to be further investigated as cancer supplements.