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Small interference RNA modulation of IL-10 in human monocyte-derived dendritic cells enhances the Th1 response.

RNA interference technology has been used to modulate dendritic cell (DC) function by targeting the expression of genes such as IL-12 and NF-kappa B. In this paper, we demonstrate that transfection of DC with IL-10-specific double strands of small interference RNA (siRNA) resulted in potent suppression of IL-10 gene expression without inducing DC apoptosis or blocking DC maturation. Inhibition of IL-10 by siRNA was accompanied by increased CD40 expression and IL-12 production after maturation, which endowed DC with the ability to significantly enhance allogeneic T cell proliferation. IL-10 siRNA transfection did not affect MHC class II, CD86, CD83, or CD54 expression in mature DC. To further test the ability of IL-10 siRNA-treated DC to induce a T cell response, naive CD4 T cells were stimulated by autologous DC pulsed with KLH. The results indicated that IL-10 siRNA-transfected DC enhanced Th1 responses by increasing IFN-gamma and decreasing IL-4 production. These findings suggest the potential for a novel immunotherapeutic strategy of using IL-10 siRNA-transfected antigen-presenting cells as vaccine delivery agents to boost the Th1 response against pathogens and tumors that are controlled by Th1 immunity.

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