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• W139232308 startingPage "61" @default.
• W139232308 abstract "The cells of immune system such as monocytes and macrophages are in first line defence against dangerous signals. In the present paper the recognition of Dectin 1 receptors and the modulation of Interleukin-10 (IL-10) and Tumor Necrosis Factor-alpha (TNF-alpha) cytokine production by Curdlan and Curdlan derivatives in peripheral blood mononuclear cells (PBMCs) were studied. The effect of Curdlan or Curdlan derivatives on the expression of Dectin 1 receptors in PBMCs was revealed by flow-cytometry and the levels of IL-10 and TNFalpha were measured by ELISA kit in supernatants of PBMCs cultured in presence or absence of Curdlan, Curdlan derivatives and LPS. Our results suggested that Curdlan and Curdlan derivatives were able to increase the expression of Dectin-1 receptors on monocyte cells. The combined treatment of Curdlan/Curdlan derivatives and Pam3Cys produced an increase of CD14+ cells possessing Dectin-1 receptors. We demonstrated that Curdlan (at 20 microg unique dose) up-regulated TNF-alpha production and down-regulated IL-10 production in PBMCs. Conversely, Palm CM/SP-Curdlan (20 microg unique dose) was able to down-regulate TNF-alpha production and to up-regulate IL-10 production in PBMCs. For instance, Palm CM/SP-Curdlan determined a 5 times decrease of TNF-alpha production than Curdlan. Regarding the effect of Palm CM/SP-Curdlan on IL-10 production in PBMCs, we noticed that the level of IL-10 was about 4 times greater than Curdlan activity. We observed that a combined treatment of Curdlan/Curdlan derivatives and LPS induced about 5 times decrease in TNF-alpha production in PBMCs. IL-10 production induced by Palm CM/SP-Curdlan and LPS was about 6 times greater than the combined effect of Curdlan and LPS. The treatment of PBMCs with SP-Curdlan alone affected neither TNF-alpha production nor IL-10 production. Our results are in accordance with other studies demonstrating that Dectin-1 and TLR2/TLR6 signaling combine to enhance the responses triggered by each receptor and the signaling pathway induced by Dectin-1 could mediate the production of pro-inflammatory cytokines." @default.
• W139232308 created "2016-06-24" @default.
• W139232308 creator A5024350965 @default.
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• W139232308 date "2011-01-18" @default.
• W139232308 modified "2023-10-17" @default.
• W139232308 title "The effects of some Curdlan derivatives on Dectin-1 expression and cytokine production in human peripheral blood mononuclear cells." @default.
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