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The Fusarium toxin deoxynivalenol disrupts phenotype and function of monocyte-derived dendritic cells in vivo and in vitro. | LitMetric

AI Article Synopsis

Article Abstract

The trichothecene mycotoxin deoxynivalenol (DON) causes systemic immuno-suppression in pigs and possibly also in humans after chronic dietary exposure. Since the outcome of every immune response is largely controlled by dendritic cells (DC), we hypothesised that a direct influence of DON on DC function might play a role in mediating DON immunotoxicity. To test this hypothesis, a 2x2 factorial design study was performed. Pigs were fed a control diet or a diet containing DON (DON-diet); monocyte-derived DC (MoDC) from these pigs were then treated with DON in vitro or left untreated. Phenotype and function of the MoDC were analysed. In vitro DON-treatment of MoDC from pigs fed the control diet resulted in a down-regulation of CD80/86 and CD40. This was associated with an activation of the mitogen-associated protein kinases ERK1/2 and JNK. The endocytic activity of MoDC was decreased after in vitro DON-exposure while their T cell stimulatory capacity was not altered. MoDC derived from pigs that had been fed the DON-diet failed to up-regulate MHC-II in response to LPS/TNFalpha. Dietary exposure of pigs to DON inhibited endocytosis of FITC-dextran by MoDC, but did not influence T cell stimulatory capacity. ERK1/2 and JNK were constitutively activated in MoDC from pigs fed the DON-diet. If MoDC derived from pigs fed the DON-diet were exposed to DON in vitro, this resulted in an up-regulation of MHC-II and CD80/86, but not CD40. In comparison to untreated MoDC from pigs fed DON-diet, endocytic capacity was further down-regulated, whereas mitogen-activated protein kinase activation was increased. In summary, DON disrupts porcine DC function in vitro and in vivo, which might contribute to the immunosuppressive effects of this mycotoxin.

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http://dx.doi.org/10.1016/j.imbio.2007.05.002DOI Listing

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