An anti-inflammatory property of Candida albicans beta-glucan: Induction of high levels of interleukin-1 receptor antagonist via a Dectin-1/CR3 independent mechanism
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SourceCytokine, 71, 2, (2015), pp. 215-222
Article / Letter to editor
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SubjectRadboudumc 4: lnfectious Diseases and Global Health RIMLS: Radboud Institute for Molecular Life Sciences
BACKGROUND: Candida albicans is an opportunistic fungal pathogen that induces strong proinflammatory responses, such as IL-1beta production. Much less is known about the induction of immune modulatory cytokines, such as the IL-1 receptor antagonist (IL-1Ra) that is the main natural antagonist of IL-1, by C. albicans. METHODS: Peripheral blood mononuclear cells (PBMC) of healthy individuals were stimulated with C. albicans and different components of the fungal cell wall. The role of pathogen recognition receptors (PRRs) for the induction of IL-1beta and IL-1Ra was investigated by using specific blockers or in PBMC from Dectin-1 deficient patients. RESULTS: C. albicans induced a strong IL-1Ra response, and this induction was primarily induced by the cell-wall component beta-glucan. Blocking IL-1Ra significantly increased C. albicans beta-glucan hyphae induced IL-1beta and IL-6 production. Surprisingly, blocking the beta-glucan receptor Dectin-1 or the downstream Syk or Raf-1 pathways only marginally reduced C. albicans-induced IL-1Ra production, while blocking of the complement receptor 3 (CR3), TLR2 or TLR4 had no effect. In line with this, blocking MAP kinases had little effect on Candida-induced IL-1Ra production. PBMC isolated from Dectin-1 deficient patients produced normal IL-1Ra amounts in response to C. albicans stimulation. Interestingly, the IL-1Ra synthesis induced by beta-glucan was blocked by inhibitors of the Akt/PI3K pathway. CONCLUSIONS: beta-glucan of C. albicans induces a strong IL-1Ra response, which is independent of the beta-glucan receptors dectin-1 and CR3. These data strongly argue for the existence of an unknown beta-glucan receptor that specifically induces an Akt/PI3K-dependent anti-inflammatory IL-1Ra response upon recognition of C. albicans.
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