Publicou 12 edições por ano
ISSN Imprimir: 1521-9437
ISSN On-line: 1940-4344
Indexed in
Immunomodulating Effects Exerted by Glucans Extracted from the King Oyster Culinary-Medicinal Mushroom Pleurotus eryngii (Agaricomycetes) Grown in Substrates Containing Various Concentrations of Olive Mill Waste
RESUMO
We have recently demonstrated that we could enhance glucan content in Pleurotus eryngii following cultivation of the mushrooms on a substrate containing different concentrations of olive mill solid waste (OMSW). These changes are directly related to the content of OMSW in the growing substrate. Using dextran sulfate sodium (DSS)-in-flammatory bowel disease (IBD) mice model, we measured the colonic inflammatory response to the different glucan preparations. We found that the histology damaging score (HDS) resulting from DSS treatment reach a value of 11.8 ± 2.3 were efficiently downregulated by treatment with the fungal extracted glucans. Glucans extracted from stalks cultivated at 20% OMSW downregulated to a HDS value of 6.4 ± 0.5 whereas those cultivated at 80% OMSW showed the strongest effects (5.5 ± 0.6). Similar downregulatory effects were obtained for expression of various intestinal cytokines. All tested glucans were equally effective in regulating the number of CD14/CD16 monocytes from 18.2 ± 2.7% for DSS to 6.4 ± 2.0 for DSS + glucans extracted from stalks cultivated at 50% OMSW. We tested the effect of glucans on lipopolysaccharide-induced production of TNF-α, which demonstrated that stalk-derived glucans were more effective than caps-derived glucans. Isolated glucans competed with anti-Dectin-1 and anti-CR3 antibodies, indicating that they contain β-glucans recognized by these receptors. In conclusion, the most effective glucans in ameliorating IBD-associated symptoms induced by DSS treatment in mice were glucan extracts prepared from the stalk of P. eryngii grown at higher concentrations of OMSW. We conclude that these stress-induced growing conditions may be helpful in selecting more effective glucans derived from edible mushrooms.
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