RESUMEN

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)-ß-d-glucans were isolated and extensively characterized by 2D NMR and methylation analysis. Traces of a (1→3)-α-d-glucan and a (1→2)-α-d-mannan 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 ß-glucan, activated the TLR2-TLR6 heterodimer. Activation of the human ß-glucan receptor dectin-1 correlated with the amount of ß-glucan in each fraction. Nitric oxide and cytokine supernatant levels of D2SC/1 dendritic cells stimulated with the P. eryngii fractions and interferon-γ were low to moderate. The results indicate that the immunomodulatory activity of water-soluble P. eryngii polysaccharide fractions is modest.

Asunto(s)

Cuerpos Fructíferos de los Hongos/química , Polisacáridos Fúngicos/metabolismo , Lectinas Tipo C/metabolismo , Pleurotus/química , Receptor Toll-Like 2/metabolismo , Animales , Línea Celular , Citocinas/metabolismo , Células Dendríticas/inmunología , Células Dendríticas/metabolismo , Polisacáridos Fúngicos/inmunología , Humanos , Inmunomodulación , Espectroscopía de Resonancia Magnética/métodos , Ratones , Óxido Nítrico/metabolismo , Polisacáridos/inmunología , Polisacáridos/metabolismo , Receptores Toll-Like/metabolismo , Agua/química , beta-Glucanos/inmunología , beta-Glucanos/metabolismo