4.7 Article

Water-soluble polysaccharides from Pleurotus eryngii fruiting bodies, their activity and affinity for Toll-like receptor 2 and dectin-1

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CARBOHYDRATE POLYMERS
卷 264, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.117991

关键词

Pleurotus eryngii; beta-Glucan; Mannogalactan; TLR-2; Dectin-1

资金

  1. Research Council of Norway through the Norwegian NMR Platform, NNP [226244/F50]
  2. Department of Chemistry at University of Oslo
  3. Faculty of Mathematics and Natural Sciences at University of Oslo

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This study isolated and characterized Pleurotus eryngii polysaccharide fractions containing various polysaccharides, and found that different components had different effects on TLR2 and dectin-1 activation. The activation of the human β-1,3-glucan receptor dectin-1 was correlated with the amount of beta-glucan in each fraction.
The mushroom cell wall contains polysaccharides that can activate cells of the innate immune system through receptors such as Toll-like receptors (TLR) and dectin-1. In the present study, Pleurotus eryngii polysaccharide fractions containing a 3-O methylated mannogalactan and (1 -> 3)/(1 -> 6)-beta-D-glucans were isolated and extensively characterized by 2D NMR and methylation analysis. Traces of a (1 -> 3)-alpha-D-glucan and a (1 -> 2)-alpha-Dmannan were also observed. Affinity for TLR2, TLR2-TLR6 and dectin-1 using HEK-cells expressing the relevant receptor genes was tested. PeWN, containing the 3-O methylated mannogalactan, was inactive towards TLR2, whereas fraction PeWB, containing more beta-glucan, activated the TLR2-TLR6 heterodimer. Activation of the human ss-glucan receptor dectin-1 correlated with the amount of beta-glucan in each fraction. Nitric oxide and cytokine supernatant levels of D2SC/1 dendritic cells stimulated with the P. eryngii fractions and interferon-gamma were low to moderate. The results indicate that the immunomodulatory activity of water-soluble P. eryngii polysaccharide fractions is modest.

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