Agaricus brasiliensis polysaccharides stimulate human monocytes to capture Candida albicans, express toll-like receptors 2 and 4, and produce pro-inflammatory cytokines

Autor(es)

Martins, Priscila Raquel ; Victoriano de Campos Soares, Angela Maria ; da Silva Pinto Domeneghini, Andrea Vanessa ; Golim, Marjorie Assis ; Kaneno, Ramon

• Tipo de documento: Artigo Científico
• Fonte: Journal of Venomous Animals and Toxins including Tropical Diseases; v. 23, n. 1 MAR 23 2017.
• Citações Web of Science: 3

Resumo

Background: Agaricus brasiliensis is a medicinal mushroom with immunomodulatory and antitumor activities attributed to the beta-glucans presented in the polysaccharide fraction of its fruiting body. Since beta-glucans enhance cellular immunoresponsiveness, in this study we aimed to evaluate the effect of an acid-treated polysaccharide-rich fraction (ATF) of A. brasiliensis on the ability of human monocytes to adhere/phagocyte C. albicans yeast cells, their expression of pattern recognition receptors and their ability to produce cytokines. Methods: Adhesion/phagocytosis of FITC-labeled C. albicans was evaluated by flow cytometry. Cells were incubated with specific fluorochrome-labeled antibodies for TLR2 and 4, beta GR and MR and also evaluated by flow cytometry. Monocytes were cultured with ATF, and culture supernatants were collected for analysis of in vitro cytokine production by ELISA (TNF-alpha, IL-1 beta, IL-12 and IL-10). Results: ATF significantly increased the adherence/phagocytosis of C. albicans by monocytes and this was associated with enhanced expression of TLR2 and TLR4, while no effect was observed on beta GR or MR. Moreover, expression of TLR4 and TLR2 was associated with higher levels of in vitro production of TNF-a and IL- 1, respectively. Production of IL-10 was also increased by ATF treatment, but we found no association between its production and the expression of Toll-like receptors. Conclusion: Our results provided us with evidence that A. brasiliensis polysaccharides affect human monocytes probably through the modulation of Toll-like receptors. (AU)

• Processo FAPESP: 06/06925-2 - O papel de receptores de imunidade inata beta-GR, MR, TLR2 e TLR4 no reconhecimento da Candida Albicans por monócitos humanos estimulados com polissacarídeos extraídos do cogumelo Agaricus brasiliensis
• Beneficiário: Ramon Kaneno
• Modalidade de apoio: Auxílio à Pesquisa - Regular